Which of the following is NOT a communicable disease?
💡Correct Answer: Option C (Diabetes)
Diabetes is a chronic, non-communicable metabolic disorder characterized by high blood sugar levels. Tuberculosis, Influenza, and Ringworm are communicable infectious diseases.
Q2
🧾 AccountsNutrition
Consider the following pairs:
- A. Vitamin A: Anaemia - B. Vitamin C: Skin Diseases - C. Vitamin D: Rickets - D. Vitamin B1: Beri Beri
Which of the above pairs are correctly matched?
💡Correct Answer: Option C (C and D)
Vitamin D deficiency causes Rickets (C is correct) and Vitamin B1 deficiency causes Beri Beri (D is correct). Vitamin A deficiency causes Night Blindness (Anaemia is due to iron deficiency), and Vitamin C deficiency causes Scurvy.
Q3
⚗️ ChemistryChemistry
Food cans are coated with tin instead of zinc due to:
💡Correct Answer: Option B (Zinc is more reactive than tin.)
Zinc is more reactive than tin. It can react with acids present in food items and make them toxic, whereas tin is less reactive and safe for food contact.
Q4
⚛️ PhysicsPhysics
Consider the following pairs:
- A. Power: Watts - B. Current: Volt - C. Frequency: Hertz - D. Resistance: Ampere
Which of the above pairs are correctly matched?
💡Correct Answer: Option B (A and C)
Power is measured in Watts (A is correct) and Frequency in Hertz (C is correct). Current is measured in Amperes (not Volts) and Resistance in Ohms (not Amperes).
Q5
⚗️ ChemistryChemistry
Consider the following pairs of elements and their chemical symbols:
- a. Sodium: 3. Na - b. Carbon: 4. C - c. Sulphur: 1. S - d. Cobalt: 2. Co
Which of the following pairs is/are correctly matched?
💡Correct Answer: Option C (a-3, b-4, c-1, d-2)
The correct symbols are: Sodium (Na) -> a-3, Carbon (C) -> b-4, Sulphur (S) -> c-1, Cobalt (Co) -> d-2.
Q6
⚛️ PhysicsMechanics
Forces that act for a limited period of time are referred to as:
💡Correct Answer: Option A (Impulsive forces)
An impulsive force is a large force acting on a body for a very short duration of time (e.g., a bat hitting a ball).
Q7
🗺️ GeographyGeography
Which hill is the Vaishno Devi Mandir located on?
💡Correct Answer: Option D (Trikuta)
Vaishno Devi Mandir is a holy Hindu temple situated on the Trikuta Hills in Katra, Jammu and Kashmir.
Q8
📜 HistoryHistory
Arrange the following historical events in chronological order:
- a. Jallianwala Bagh Massacre - b. Dandi March - c. Lucknow Pact - d. Quit India Movement
💡Correct Answer: Option B (c, a, b, d)
The correct chronological order is: Lucknow Pact (1916), Jallianwala Bagh Massacre (1919), Dandi March (1930), and Quit India Movement (1942). This matches sequence: c, a, b, d.
Q9
🏛️ CivicsPolity
The first legislature of the princely state of Jammu and Kashmir was called the:
💡Correct Answer: Option A (Praja Sabha)
The first legislature of Jammu and Kashmir was established in 1934 by Maharaja Hari Singh and was called the Praja Sabha.
Q10
🗺️ GeographyGeography
Which of the following is NOT a tributary of Jhelum River?
💡Correct Answer: Option C (Verinag)
Verinag is the origin spring of the Jhelum River, located in Anantnag. Vishaw, Sind Nallah, and Romushi are tributaries of the Jhelum River.
Q11
🗺️ GeographyGeography
Which of the places is known as the "Gateway to the Kashmir valley"?
💡Correct Answer: Option D (None of the above)
Banihal (also Qazigund) is known as the 'Gateway to Kashmir Valley' because it connects Jammu with Srinagar through the Banihal pass. Since it is not in the options, 'None of the above' is correct.
Q12
🗺️ GeographyGeography
Which pass connects Jammu and Kashmir with Ladakh?
💡Correct Answer: Option B (Zoji La Pass)
The Zoji La Pass connects the Kashmir Valley (near Sonamarg) to Ladakh (Drass/Kargil).
Q13
🏛️ CivicsPolity
What is the official language of Jammu and Kashmir?
💡Correct Answer: Option C (Urdu)
Urdu was traditionally the sole official language of Jammu and Kashmir since 1889. Although the J&K Official Languages Act, 2020 added Kashmiri, Dogri, Hindi, and English as official languages, Urdu remains the standard correct answer in classical state competitive exams.
Q14
🗺️ GeographyGeography
Arrange the following Indian states in order from North to South:
- a. Himachal Pradesh - b. Tamil Nadu - c. Telangana - d. Madhya Pradesh
💡Correct Answer: Option C (a, d, c, b)
Geographical arrangement from North to South is: Himachal Pradesh (a), Madhya Pradesh (d), Telangana (c), and Tamil Nadu (b). This corresponds to sequence a, d, c, b.
Q15
🗺️ GeographyAgriculture
Consider the following statements regarding Rabi crops:
- a. Rabi crops are sowed between October and November. - b. Rabi crops require a lot of water. - c. Rabi crops need warm weather for growth.
Which of the above statements is/are correct?
💡Correct Answer: Option A (Only a)
Statement a is correct. Rabi crops (winter crops) are sown in October-November and harvested in spring. Statements b and c are incorrect because Kharif crops require a lot of water and warm weather, whereas Rabi crops require cool climates.
Q16
🗺️ GeographyGeography
In which tourist place is the Kolahoi glacier located?
💡Correct Answer: Option B (Pahalgam)
Kolahoi Glacier is a valley glacier located in the northwestern Himalayan Range, approximately 26 km north of Pahalgam.
Q17
🗺️ GeographyGeography
Consider the following pairs of lakes and the states they are located in:
- a. Hussain Sagar: 4. Telangana - b. Pulicate Lake: 3. Andhra Pradesh - c. Dal Lake: 2. Jammu and Kashmir - d. Loktak Lake: 1. Manipur
Which of the following pairs is/are correctly matched?
💡Correct Answer: Option D (a-4, b-3, c-2, d-1)
The correct matches are: Hussain Sagar is in Telangana (a-4), Pulicat Lake in Andhra Pradesh (b-3), Dal Lake in J&K (c-2), and Loktak Lake in Manipur (d-1). This corresponds to a-4, b-3, c-2, d-1.
Q18
📜 HistoryHistory
Who is popularly known as the "Grand Old Man of India"?
💡Correct Answer: Option B (Dadabhai Naoroji)
Dadabhai Naoroji is known as the 'Grand Old Man of India'. He was a prominent leader in the Indian national movement and formulated the Drain of Wealth theory.
Q19
🗺️ GeographyGeography
Consider the following pairs of dams and the states they are located in:
- a. Sardar Sarovar Dam: 3. Gujarat - b. Bhavani Sagar Dam: 4. Tamil Nadu - c. Koyna Dam: 2. Maharashtra - d. Tehri Dam: 1. Uttarakhand
Which of the following pairs is/are correctly matched?
💡Correct Answer: Option C (a-3, b-4, c-2, d-1)
The correct matches are: Sardar Sarovar in Gujarat (a-3), Bhavani Sagar in Tamil Nadu (b-4), Koyna in Maharashtra (c-2), and Tehri in Uttarakhand (d-1). This corresponds to: a-3, b-4, c-2, d-1.
Q20
📜 HistoryHistory
Consider the following pairs of historical terms and entities of Jammu and Kashmir:
- a. Founder of Dogra Dynasty: 4. Gulab Singh - b. Dar-Ul-Aman (written as Dar-Ul-Alam): 1. Maharaja Ranjit Dev - c. Mian Deedo: 2. Rebellion Group Head - d. Treaty of Lahore: 3. 1846
Which of the following pairs is/are correctly matched?
💡Correct Answer: Option D (a-4, b-1, c-2, d-3)
The correct matches are: Maharaja Gulab Singh founded the Dogra Dynasty (a-4); Jammu was named 'Dar-ul-Aman' during the reign of Maharaja Ranjit Dev due to religious peace (b-1); Mian Deedo was a rebel leader against Sikh rule in Jammu (c-2); and the Treaty of Lahore was signed in 1846 (d-3).
Q21
📊 EconomicsEconomics
Which of the below statements is correct?
💡Correct Answer: Option D (When economists study a market's price, their main goal is to figure out why the price is what it is and how it might change.)
Statement D is correct. Statement A is wrong because Microeconomics studies individual behaviors (Macroeconomics studies the overall economy). Statement B is wrong for the opposite reason. Statement C is wrong because governments can regulate prices via caps/floors.
Q22
📊 EconomicsEconomics
What is the meaning of a 'Mixed Economy'?
💡Correct Answer: Option B (Both the public and private sectors are involved)
A mixed economy is an economic system that blends elements of a market economy (private sector) with elements of a planned economy (public/state sector). India is a prime example.
Q23
📊 EconomicsEconomics
Which of the following is the relation that the law of demand defines?
💡Correct Answer: Option B (Price and quantity of a commodity)
The Law of Demand states that, other things being equal (ceteris paribus), the quantity demanded of a commodity is inversely related to its price.
Q24
📊 EconomicsEconomics
What is Gross Domestic Product?
💡Correct Answer: Option D (The monetary value of all finished goods and services made within a country during a specific period.)
Gross Domestic Product (GDP) is the total monetary or market value of all finished goods and services produced within a country's borders during a specific time period (usually annually).
Q25
📊 EconomicsEconomics
The 'Agreement on Technical Barriers to Trade (TBT)' is related to which institution?
💡Correct Answer: Option C (World Trade Organization)
The Agreement on Technical Barriers to Trade (TBT Agreement) is an international treaty administered by the World Trade Organization (WTO) to ensure regulations/standards do not create unnecessary obstacles to trade.
Q26
📊 EconomicsEconomics
Commercial Paper (CP) is an unsecured money market instrument issued in the form of a:
💡Correct Answer: Option D (Promissory Note)
Commercial Paper (CP) is an unsecured, short-term money market instrument issued by highly-rated corporations in the form of a promissory note.
Q27
📊 EconomicsEconomics
Bank rate is the rate at which the RBI extends credit to the:
💡Correct Answer: Option C (Commercial Banks)
Bank Rate is the official rate at which the Reserve Bank of India (RBI) provides long-term loans and rediscounts bills for commercial banks without requiring collateral.
Q28
📊 EconomicsEconomics
Which five-year plan of India was based on the Mahalanobis model?
💡Correct Answer: Option B (Second)
The Second Five-Year Plan (1956-1961), drafted by Prasanta Chandra Mahalanobis, focused on rapid industrialization and heavy basic industries.
Q29
📊 EconomicsEconomics
Which is NOT one of the four main factors of production?
💡Correct Answer: Option C (Manufacturing)
The four classical factors of production are Land, Labour, Capital, and Entrepreneurship. Manufacturing is a production process/sector, not a fundamental factor of production.
Q30
📊 EconomicsEconomics
What does the Lorenz curve represent?
💡Correct Answer: Option C (Income distribution)
The Lorenz curve is a graphical representation developed by Max O. Lorenz in 1905 to show the distribution of income or wealth within an economy (inequality representation).
Q31
⚛️ PhysicsPhysics
The thrust on a rocket is in:
💡Correct Answer: Option A (the same direction of the rocket)
According to Newton's Third Law of Motion, the downward ejection of exhaust gases (action) creates an equal and opposite upward reaction force (thrust) on the rocket, which acts in the same direction as the rocket's motion.
Q32
⚛️ PhysicsPhysics
What causes the twinkling of stars?
💡Correct Answer: Option A (Atmospheric refraction of starlight)
The twinkling of stars is caused by the atmospheric refraction of starlight as it passes through different layers of air with continuously changing refractive indices.
Q33
🧾 AccountsGeneral Science
Who invented the Light Bulb?
💡Correct Answer: Option A (Thomas Edison)
Thomas Alva Edison patented the first commercially practical incandescent light bulb in 1879.
Q34
🧬 BiologyBiology
The Bacille Calmette-Guérin vaccine (popularly called BCG vaccine) is used to prevent which of these diseases?
💡Correct Answer: Option A (Tuberculosis)
BCG (Bacille Calmette-Guérin) vaccine is a vaccine primarily used to protect against Tuberculosis (TB).
Q35
🧬 BiologyBiology
Name the hardest material present in the human body:
💡Correct Answer: Option C (Enamel)
Tooth Enamel, which covers the crown of the tooth, is the hardest and most mineralized substance in the human body.
Q36
⚗️ ChemistryChemistry
Which is the most malleable metal?
💡Correct Answer: Option A (Gold)
Gold is the most malleable (and ductile) metal. It can be beaten into extremely thin gold sheets (gold leaf) without breaking.
Q37
⚗️ ChemistryChemistry
What is dry ice?
💡Correct Answer: Option C (Solid Carbon dioxide)
Dry ice is the common name for solid Carbon Dioxide (CO2). It is used as a cooling agent because it sublimates directly from solid to gas.
Q38
⚗️ ChemistryChemistry
What is the common name of Calcium Hypochlorite?
💡Correct Answer: Option B (Bleaching powder)
Calcium Hypochlorite (Ca(OCl)2) is the chemical name for Bleaching Powder, widely used for disinfecting water and bleaching.
Q39
⚛️ PhysicsPhysics
The washing machine works on the principle of which of the following?
💡Correct Answer: Option D (Centrifugation)
A washing machine works on the principle of centrifugation. High-speed spinning creates centrifugal force that separates water from clothes.
Q40
⚛️ PhysicsPhysics
'Short-sight' in the human eye can be corrected by using a proper:
💡Correct Answer: Option B (Concave Lens)
Short-sightedness (Myopia) occurs when light focuses in front of the retina. It is corrected using a Concave (diverging) lens to push the focus back onto the retina.
Q41
🔬 Forensic ScienceForensic Science
The prime work of investigating officer is based on which of the following principle?
💡Correct Answer: Option B (Principle of exchange)
Locard's Principle of Exchange states that 'every contact leaves a trace', which forms the fundamental basis of crime scene investigation.
Q42
🔬 Forensic ScienceCrime Scene Management
Mark the proper sequence of tasks to be completed in a crime scene.
i. Packaging of physical evidence ii. Securing the scene iii. Collecting physical evidence iv. Recognizing physical evidence
💡Correct Answer: Option C (ii, iv, iii, i)
The correct sequence is: first secure the scene (ii), then recognize/identify evidence (iv), then collect the evidence (iii), and finally package it (i).
Q43
🔬 Forensic ScienceLaw of Evidence
A witness who wants the accused to be behind bars for the committed crime is called as
💡Correct Answer: Option A (Interested witness)
An interested witness is one who has a personal interest in the outcome of the case or in seeing the accused convicted.
Q44
🔬 Forensic ScienceForensic Science Principles
Which of the following are the basic principles of forensic science?
i. Principle of Exchange ii. Principle of comparison iii. Principle of Analysis
💡Correct Answer: Option D (i, ii and iii)
Forensic science is based on several laws and principles, including the Principle of Exchange (Locard), the Principle of Comparison, and the Principle of Analysis.
Q45
🔬 Forensic ScienceForensic Psychology
Which of the following techniques are used to observe psychosomatic changes?
i. Polygraphy ii. Psychological Stress Evaluator iii. Brain fingerprinting
💡Correct Answer: Option A (i and ii)
Polygraphy and the Psychological Stress Evaluator (PSE) measure physiological responses (autonomic nervous system activity) related to psychological stress (psychosomatic changes). Brain fingerprinting measures cognitive brainwaves (P300), which are cognitive/recognition-based rather than psychosomatic/emotional.
Q46
🔬 Forensic ScienceForensic Institutions
Match the following:
List-I (Institution offering courses in forensic science) i. Osmania University ii. Dr. Harisingh Gour University iii. Bundelkhand University iv. National Forensic Science University
List-II (Location) a. Sagar, Madhya Pradesh b. Delhi c. Hyderabad, Telangana d. Jhansi, Uttar Pradesh
💡Correct Answer: Option C (i-c, ii-a, iii-d, iv-b)
The correct matches are: Osmania University is in Hyderabad (i-c); Dr. Harisingh Gour University is in Sagar, MP (ii-a); Bundelkhand University is in Jhansi, UP (iii-d); NFSU has a campus in Delhi (iv-b).
Q47
🔬 Forensic ScienceForensic Institutions
Match the following:
List-I (NFSU Campus) i. Bhopal ii. Delhi iii. Dharwad iv. Gandhinagar
List-II (Number of Departments) a. 2 b. 3 c. 6 d. 16
💡Correct Answer: Option B (i-a, ii-c, iii-b, iv-d)
As per the university configuration, the matching is: Bhopal campus has 2 departments (i-a); Delhi campus has 6 departments (ii-c); Dharwad campus has 3 departments (iii-b); and the main Gandhinagar campus has 16 departments (iv-d).
Q48
🔬 Forensic ScienceForensic Psychology
For its use in dissemination of justice, forensic psychology is divided into
i. Clinical ii. Experimental iii. Cognitive
💡Correct Answer: Option D (i, ii and iii)
Forensic psychology encompasses the clinical application (assessment/therapy), experimental research on legal issues, and cognitive studies (such as memory reliability and lie detection) used in justice delivery.
Q49
🔬 Forensic ScienceFingerprints
Which of the following are the principles of fingerprint analysis?
i. Universal ii. Individual iii. Classifiable
💡Correct Answer: Option B (ii and iii)
The core scientific principles/laws of fingerprint analysis are that fingerprints are Individual (unique to each person) and Classifiable (based on systematic ridge patterns). While prints are virtually universal to humans, 'Universal' is not defined as a core principle of fingerprint identification compared to individuality and classifiability.
Q50
🔬 Forensic ScienceFingerprints
Which of the following techniques of fingerprint development can be used for porous surfaces?
i. Cyanoacrylate fuming ii. Silver nitrate method iii. Ninhydrin method
💡Correct Answer: Option B (ii and iii)
Silver nitrate and Ninhydrin methods are chemical development techniques used specifically for porous surfaces like paper and cardboard. Cyanoacrylate (superglue) fuming is used for non-porous surfaces like plastic and glass.
Q51
🔬 Forensic ScienceForensic Administration
The Directorate of Forensic Science Services was bifurcated from BPR & D based on the recommendations of
i. Malimath Committee ii. Padmanabhaiah Committee iii. National Human Rights Commission
💡Correct Answer: Option B (ii and iii)
The bifurcation of the Directorate of Forensic Science Services (DFSS) from the Bureau of Police Research & Development (BPR&D) in 2002 was based on the recommendations of the Padmanabhaiah Committee on Police Reforms and the National Human Rights Commission (NHRC).
Q52
🔬 Forensic ScienceForensic Institutions
Match the following:
List-I (CFSL) i. Bhopal ii. Delhi iii. Hyderabad iv. Kolkata
List-II (Year of Establishment) a. 1957 b. 1967 c. 1968 d. 2011
💡Correct Answer: Option A (i-d, ii-c, iii-b, iv-a)
The correct establishment years are: Kolkata CFSL was established in 1957 (iv-a); Hyderabad CFSL in 1967 (iii-b); Delhi CFSL in 1968 (ii-c); and Bhopal CFSL in 2011 (i-d).
Q53
🔬 Forensic ScienceForensic Institutions
Arrange the following Forensic Institution as per their year of establishment from older to latest.
a. GEQD Calcutta b. CFPB Calcutta c. CFPB, New Delhi d. GEQD Hyderabad e. GEQD Shimla
💡Correct Answer: Option B (b, e, a, d, c)
The correct chronological order of establishment is: CFPB Calcutta (1897) -> GEQD Shimla (1906) -> GEQD Calcutta (1964) -> GEQD Hyderabad (1968) -> CFPB New Delhi (1973). This corresponds to order: b, e, a, d, c.
Q54
🔬 Forensic ScienceForensic Institutions
Match the following:
List-I (State FSL) i. Bombay ii. Delhi iii. Madras iv. Srinagar
List-II (Year of Establishment) a. 1958 b. 1959 c. 1964 d. 1993
💡Correct Answer: Option C (i-a, ii-d, iii-b, iv-c)
The correct matching is: Bombay FSL was established in 1958 (i-a); Delhi FSL in 1993 (ii-d); Madras FSL in 1959 (iii-b); and Srinagar FSL in 1964 (iv-c).
Q55
🔬 Forensic ScienceCrime Scene Management
Specimen of material collected from crime scene for comparing with the questioned material is called as
💡Correct Answer: Option D (Control Sample)
A control sample is a specimen of material collected from the crime scene (e.g. from an adjacent, unstained area of a substrate) to compare with the questioned evidence to ensure that background or substrate interference is accounted for.
Q56
🔬 Forensic ScienceForensic Medicine
According to Bichat, mode of death due to failure of circulatory system is called as
💡Correct Answer: Option D (Syncope)
Xavier Bichat classified modes of death into a 'tripod of life'. Failure of the circulatory system (heart) is called Syncope, failure of the nervous system (brain) is Coma, and failure of the respiratory system (lungs) is Asphyxia.
Q57
⚗️ ChemistryArson Investigation
The best material to collect liquid samples of suspected accelerants found at crime scene is
💡Correct Answer: Option C (Airtight metal container)
Suspected liquid accelerants (hydrocarbons like gasoline) must be collected in airtight metal containers (such as clean paint cans) because hydrocarbons can dissolve plastic and glass can break.
Q58
🔬 Forensic ScienceInquest
If a person dies in a psychiatric hospital in Delhi-NCR, the investigation will be carried out by
💡Correct Answer: Option B (Magistrate Inquest)
Under Section 176 of the Code of Criminal Procedure (CrPC) in India, any death occurring in a psychiatric hospital, prison, or police custody must be investigated by a Judicial or Executive Magistrate (Magistrate Inquest).
Q59
🔬 Forensic ScienceDocument Examination
The definition of document in given at
💡Correct Answer: Option A (Section 29 of Indian Penal Code, 1860)
The definition of 'document' is provided under Section 29 of the Indian Penal Code (IPC), 1860 (as well as under Section 3 of the Indian Evidence Act, 1872).
Q60
🔬 Forensic ScienceForensic Medicine
The bluish-purple/purple-red discolouration of skin on dependent part of body after death is called as
💡Correct Answer: Option B (Post mortem Hypostasis)
Post-mortem hypostasis (also called livor mortis or post-mortem lividity) is the pooling of blood in the dependent parts of the body due to gravity, causing a bluish-purple discoloration.
Q61
🔬 Forensic ScienceForensic Medicine
Match the following:
List-I (Blunt Force Injury) i. Abrasion ii. Contusion iii. Incision iv. Laceration
List-II (Characteristic of Injury) a. Effusion of blood into tissue due to ruptured blood vessels b. Destruction of superficial layer of skin. c. Tearing or splitting of skin d. Clean cut through the tissue
💡Correct Answer: Option C (i-b, ii-a, iii-d, iv-c)
The correct matches are: Abrasion - destruction of superficial layer (i-b); Contusion (bruise) - effusion of blood (ii-a); Incision - clean cut through tissue (iii-d); Laceration - tearing or splitting of skin (iv-c).
Q62
🔬 Forensic ScienceForensic Medicine
An unusual type of suicide in which the victim inflicts a single large wound on the abdomen while in sitting position causing evisceration of internal organ, is called as
💡Correct Answer: Option D (Harakari)
Harakari (or Seppuku) is a traditional Japanese ritual suicide involving disembowelment (cutting open the abdomen and eviscerating internal organs).
Q63
🔬 Forensic ScienceBurns
The full thickness destruction of skin occurs within seconds above a temperature of
💡Correct Answer: Option C (70°C)
Thermal studies show that exposure to temperatures above 70°C (158°F) causes full-thickness (third-degree) skin destruction within seconds due to rapid protein denaturation.
Q64
⚛️ PhysicsPhysics
The Standard of Length is based on
💡Correct Answer: Option C (The speed of light)
Since 1983, the meter has been defined internationally as the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second. This is based on the speed of light.
Q65
⚛️ PhysicsPhysics
Match the following:
List-I i. Microns ii. Angstroms iii. Fermi iv. Kilometers
List-II a. Distance between earth and moon. b. Inter atomic distance in a solid c. Size of nucleus. d. Wavelength of infrared laser.
💡Correct Answer: Option A (i-d, ii-b, iii-c, iv-a)
The correct matching of length scales is: Microns corresponds to infrared laser wavelength (i-d); Angstroms corresponds to inter-atomic distances (ii-b); Fermi corresponds to nuclear size (iii-c); Kilometers corresponds to Earth-Moon distance (iv-a).
Q66
⚛️ PhysicsPhysics
A plane travelling north at 200m/s turns and then travels south at 200m/s. The change in its velocity is:
💡Correct Answer: Option D (400 m/s south)
Initial velocity = 200 m/s North. Final velocity = 200 m/s South (which is -200 m/s North). Change in velocity = Final - Initial = -200 - 200 = -400 m/s North, which is equal to 400 m/s South.
Q67
⚛️ PhysicsPhysics
Which of the following situations are possible?
i. A body having velocity east and acceleration west. ii. A body having constant velocity and variable acceleration. iii. A body having zero velocity and non-zero acceleration.
💡Correct Answer: Option B (i & iii)
Situation (i) is possible (e.g. decelerating vehicle moving East). Situation (iii) is possible (e.g. a ball at the top of its flight has zero velocity but non-zero gravitational acceleration). Situation (ii) is impossible because constant velocity implies acceleration must be strictly zero.
Q68
⚛️ PhysicsPhysics
Match the following:
List-I i. kWh ii. ampere iii. volt iv. watt
List-II a. Electric Power. b. Electric Energy. c. Potential difference. d. Electric Current.
💡Correct Answer: Option D (i-b, ii-d, iii-c, iv-a)
The correct units are: kWh measures Electric Energy (i-b); Ampere measures Electric Current (ii-d); Volt measures Potential Difference (iii-c); Watt measures Electric Power (iv-a).
Q69
⚛️ PhysicsPhysics
A coulomb is same as
💡Correct Answer: Option A (Ampere second)
Electric charge (Q) is current (I) multiplied by time (t). Therefore, 1 Coulomb = 1 Ampere × 1 Second.
Q70
⚛️ PhysicsPhysics
Arrange the following in the increasing chronological order of their occurrence:
i. Michael Faraday discovers electromagnetic induction. ii. Benjamin Franklin proves lightning is electricity. iii. Nicolas Tesla develops AC current iv. Thomas Edison develops DC current
💡Correct Answer: Option B (ii, i, iv, iii)
The chronological order is: Benjamin Franklin's lightning experiment (1752, ii) -> Michael Faraday discovers electromagnetic induction (1831, i) -> Thomas Edison develops DC (1882, iv) -> Nikola Tesla develops AC (1888, iii). Thus, the order is ii, i, iv, iii.
Q71
⚛️ PhysicsPhysics
Charge is distributed uniformly along a long straight wire. The electric field at 2cm from the wire is 20 newton/coulomb. The electric field at 4cm from the wire is:
💡Correct Answer: Option B (10 newton/coulomb)
For an infinite line charge, the electric field (E) is inversely proportional to distance (r) from the wire: E = λ / (2πε₀r). As distance doubles (from 2cm to 4cm), the electric field halves (from 20 N/C to 10 N/C).
Q72
⚛️ PhysicsPhysics
Match the following:
List-I i. Biot-Savart Law ii. Fleming's Left-hand rule iii. Fleming's Right-hand rule iv. Right hand thumb rule
List-II a. Direction of induced current. b. Direction of magnetic lines due to current. c. Direction of force due to magnetic induction d. Magnitude and direction of magnetic induction
💡Correct Answer: Option C (i-d, ii-c, iii-a, iv-b)
The correct matches are: Biot-Savart Law gives magnitude/direction of magnetic induction (i-d); Fleming's Left-hand rule gives the direction of force on a current in a magnetic field (ii-c); Fleming's Right-hand rule gives the direction of induced current (iii-a); Right hand thumb rule gives the direction of magnetic lines (iv-b).
Q73
⚛️ PhysicsPhysics
If "r" is the distance of a moving charge, the magnitude of magnetic field produced by the charge is proportional to:
💡Correct Answer: Option D (1/r²)
According to the Biot-Savart law, the magnetic field produced by a moving charge is inversely proportional to the square of the distance (r) from the charge (B ∝ 1/r²).
Q74
⚛️ PhysicsPhysics
Two electrons travelling with same speed. The magnetic field is zero at the mid-point between them. This means,
💡Correct Answer: Option B (They are travelling along parallel lines in the same direction.)
By the right-hand rule, when two negative charges (electrons) travel at equal speed along parallel lines in the same direction, the magnetic fields they produce at the exact midpoint are equal in magnitude but opposite in direction, cancelling each other out to zero.
Q75
⚛️ PhysicsPhysics
According to Faraday's Law, an induced emf is proportional to
💡Correct Answer: Option C (The rate of change of magnetic flux)
Faraday's Law of electromagnetic induction states that the induced electromotive force (emf) in a closed circuit is directly proportional to the time rate of change of magnetic flux through the circuit.
Q76
🔬 Forensic ScienceFootprints
A footprint classification system is required for filing the footprints of
i. New born babies ii. Military airmen iii. People lacking arms
💡Correct Answer: Option D (i, ii & iii)
Footprint classification systems are used for filing records of newborn babies (hospital security), military airmen (for identification after plane crashes/burns), and individuals lacking arms (who cannot provide fingerprints).
Q77
🔬 Forensic ScienceFootprints
The main footprint classification systems used over the years are
i. FBI's Footprint Classification System ii. Vucetich Footprint Classification System iii. Chatterjee's Footprint Classification System
💡Correct Answer: Option B (i & iii)
The primary footprint classification systems used historically in forensic science are the FBI's Footprint Classification System and Chatterjee's Footprint Classification System (developed in India). Juan Vucetich developed a fingerprint classification system, not a footprint system.
Q78
🔬 Forensic ScienceFootprints
Ordinarily, the footmarks are inadequate as evidence because,
i. Footmarks are incomplete ii. Footmarks do not carry ridge details iii. Footmarks carry very few individualizing features.
💡Correct Answer: Option A (i & ii)
Ordinarily, bare footprints at crime scenes are inadequate as conclusive evidence because they are often incomplete and do not contain the fine, unique friction ridge details needed for positive identification (unlike fingerprints).
Q79
🔬 Forensic ScienceFootprints
Which of the following materials can be used for casting footprint impressions in snow
i. Molten wax ii. Plaster of Paris solution iii. Molten Sulphur.
💡Correct Answer: Option B (i & iii)
Molten sulfur and molten wax can be used to cast impressions in snow because they solidify rapidly without generating excessive heat that would melt the details. Plaster of Paris solution is water-based and generates heat during its setting process, which would melt the snow and destroy the print detail.
Q80
🔬 Forensic ScienceTrackers
Which of the following statements are correct?
i. The art of tracking through gait pattern is practiced in various parts of India by certain families. ii. The trackers are, by and large, uneducated persons. iii. The trackers do not take any extensive measurements.
💡Correct Answer: Option D (i, ii & iii)
Traditionally, the art of tracking (using gait and footprints) has been practiced in rural parts of India by specific families (e.g. puggees). Trackers are usually uneducated and rely on visual cues, experience, and instinct rather than taking extensive scientific measurements.
Q81
🔬 Forensic ScienceGait Analysis
In scientific study of gait pattern, which of the following characteristics are noted?
i. Dimensions of Mark ii. Pressure points iii. Pressure defects
💡Correct Answer: Option D (i, ii & iii)
A scientific analysis of a gait pattern involves checking the dimensions of the prints, the specific pressure points of the foot during stride, and any pressure defects (uneven weight distribution or gait abnormalities).
Q82
🔬 Forensic ScienceGait Analysis
For evaluating gait pattern evidence by forensic science laboratory staff, the minimum number of consecutive foot or footwear marks required is:
💡Correct Answer: Option C (3)
To perform an analysis of a gait pattern (step length, stride length, step angle, etc.), a minimum sequence of 3 consecutive prints is required by forensic examiners.
Q83
🔬 Forensic ScienceFootprints
Match the following:
List-I i. Casting track marks ii. Lifting track marks iii. Photograph of track marks iv. Tracing track marks
List-II a. Plastic sheet is preferable. b. Easy to do under artificial light. c. A bromide paper sheet can be used for. d. Plasticine can be used for.
💡Correct Answer: Option A (i-d, ii-c, iii-b, iv-a)
The correct matches are: Casting track marks - Plasticine can be used (i-d); Lifting track marks - Bromide paper can be used (ii-c); Photograph - oblique/artificial light is helpful (iii-b); Tracing - plastic sheet is preferable (iv-a).
Q84
🔬 Forensic ScienceImpression Evidence
For collecting impression evidence, the first electrostatic dust lifting device was created by:
💡Correct Answer: Option A (Kato Masao)
Kato Masao, a Japanese police officer, developed the first formal electrostatic dust print lifting device around 1970, which improved on the static celluloid sheet concept of Sancyasu Toma.
Q85
🔬 Forensic ScienceTyre Impressions
The photographic technique to record the whole tread of a tyre is called as
💡Correct Answer: Option B (Periphography)
Periphography is a specialized photographic technique used to capture the entire circumferential tread pattern of a tyre (or any cylindrical surface) as a single flat image.
Q86
🔬 Forensic ScienceTool Marks
Which of the following statements are correct?
i. Striation is a type of tool mark. ii. An instrument used to study striations on different objects is known as striagraph. iii. For comparing striation marks, striagraphy is better than comparison microscope.
💡Correct Answer: Option A (i & ii)
Statements i and ii are correct. A striation is a scratch-type tool mark, and a striagraph is a mechanical tracing device used to record them. Statement iii is incorrect because the comparison microscope is the standard, most widely accepted and superior tool for comparing striations in forensics.
Q87
🔬 Forensic ScienceGlass
Match the following:
List-I i. Borosil Glass ii. Bottle Glass iii. Optical Glass iv. Plate Glass
List-II a. PbO. b. B₂O₃ c. BaO. d. MgO.
💡Correct Answer: Option C (i-b, ii-c, iii-a, iv-d)
The correct matching is: Borosilicate glass contains B₂O₃ (i-b); Bottle glass contains BaO (ii-c); Optical (flint) glass contains PbO (iii-a); Plate glass contains MgO (iv-d).
Q88
🔬 Forensic ScienceGlass
Match the following:
List-I (Element) i. Arsenic ii. Cobalt iii. Chromium iv. Titanium
List-II (Effect on Glass) a. Air Bubble removal b. Blue colour c. Decolourisation d. Green Colour
💡Correct Answer: Option B (i-a, ii-b, iii-d, iv-c)
The matching is: Arsenic is used for air bubble removal (i-a); Cobalt imparts a blue color (ii-b); Chromium imparts a green color (iii-d); Titanium is used for decolorisation (iv-c).
Q89
🔬 Forensic ScienceGlass
Long curved ridges on the broken surface of glass are termed as:
💡Correct Answer: Option A (Rib marks)
Rib marks (or concentric rib lines) are curved ridges that form on the broken edges of glass fractures, running perpendicular to radial crack lines.
Q90
🔬 Forensic ScienceGlass
Which of the following statements are correct?
i. Glass is an inorganic product of fusion, cooled to a rigid condition without crystallization. ii. Glass is strong in compression. iii. Glass is strong in tension.
💡Correct Answer: Option A (i & ii)
Statements i and ii are correct. Glass is an amorphous solid that is strong when subjected to compression, but behaves weakly in tension (brittle failure occurs easily under pulling forces).
Q91
🔬 Forensic ScienceGlass
Match the following:
List-I i. Flat glass ii. Float glass iii. Laminated glass iv. Toughened glass
List-II a. Fourcault process b. Liquid tin bed c. Processed by tempering d. Sandwiched plastic sheet
💡Correct Answer: Option A (i-a, ii-b, iii-d, iv-c)
The correct matching is: Flat glass - Fourcault process (i-a); Float glass - Liquid tin bed (ii-b); Laminated glass - Sandwiched plastic sheet (iii-d); Toughened glass - Processed by tempering (iv-c).
Q92
🔬 Forensic ScienceGlass
Which of the following physical property is most valuable in distinguishing small glass fragments?
💡Correct Answer: Option C (Refractive Index)
Refractive Index (RI) is the most valuable and measurable physical property for analyzing and distinguishing very small glass fragments in a forensic laboratory.
Q93
🔬 Forensic ScienceTool Marks
Best material for casting tool mark is
💡Correct Answer: Option C (Liquid silicone)
Liquid silicone (such as Mikrosil) is the best casting material for tool marks because it flows into microscopic details, has negligible shrinkage, and can be easily peeled off once cured.
Q94
🔬 Forensic ScienceFirearms
Which of the following statements are true for small arms?
i. Can be easily handled and operated by a single person. ii. Must be smaller than 10 inches in length. iii. Includes pistol and revolvers.
💡Correct Answer: Option B (i & iii)
Statements i and iii are true. Small arms are weapons designed for individual use. There is no rule requiring them to be smaller than 10 inches; rifles and shotguns are also classified as small arms.
Q95
🔬 Forensic ScienceFirearms
In a revolver, the number of chambers is:
💡Correct Answer: Option D (D) Six)
A typical revolver cylinder has six chambers (holding six rounds of ammunition), though some models can have more or fewer.
Q96
🔬 Forensic ScienceFirearms
A tapering surface which connects the bore and chamber of some firearms is termed as:
💡Correct Answer: Option C (Leed)
The leed (or leade) is the tapering throat area of the barrel that connects the chamber to the rifled bore, guiding the bullet into the rifling.
Q97
🔬 Forensic ScienceFirearms
Match the following:
List-I (Location of Firing pin) i. Breach block ii. Bolt Head iii. Hammer iv. Moving Breech block
List-II (Type of firearm) a. Bolt action rifles b. Revolvers c. Automatic firearms d. Shotguns
💡Correct Answer: Option B (i-d, ii-a, iii-b, iv-c)
The correct matching is: Breech block - Shotguns (i-d); Bolt Head - Bolt action rifles (ii-a); Hammer - Revolvers (iii-b); Moving Breech block - Automatic firearms (iv-c).
Q98
🔬 Forensic ScienceFirearms
Which of the following statements are true for Breech face?
i. It is the area surrounding the firing pin hole. ii. It seals the barrel from chamber side. iii. It comes in close contact with the base of the cartridge.
💡Correct Answer: Option D (i, ii & iii)
The breech face is the portion of the bolt or breech block that seals the rear of the chamber, surrounds the firing pin hole, and directly supports the base of the cartridge case during firing.
Q99
🔬 Forensic ScienceFirearms
Which of the following marks are usually present on a cartridge fired from a good quality firearm?
i. Firing pin mark. ii. Breech face. iii. Chamber marks.
💡Correct Answer: Option D (i, ii & iii)
When a cartridge is fired, the firing pin indent, breech face marks (transferred under high pressure), and chamber scraping marks are typically left on the primer and cartridge case.
Q100
🔬 Forensic ScienceFirearms
The internal diameter of a barrel is known as:
i. Bore ii. Calibre iii. Gauge
💡Correct Answer: Option A (i & ii)
Bore and Calibre refer to the internal diameter of the barrel. Gauge is a system of measurement indicating the diameter of smoothbore barrels (shotguns) in terms of lead balls per pound, but is not the diameter name itself.
Q101
🔬 Forensic ScienceShotguns
Which of the following statement is true for Barrel choke?
i. It is the reducing of bore of a shotgun at the breech end ii. Choke increases the effective range of a shotgun. iii. Reduction of diameter by one millimeter is called as full choke.
💡Correct Answer: Option C (ii & iii)
Statements ii and iii are true. A choke is a constriction at the muzzle end (not the breech end) of a shotgun barrel, which tightens the shot pattern to increase the effective range. A 1mm reduction in diameter corresponds to a full choke.
Q102
🔬 Forensic ScienceFirearms
A firearm can have the following type of barrels:
i. Smooth bore ii. Rifled bore iii. Smoothbore with partial rifling
💡Correct Answer: Option D (i, ii & iii)
Barrels can be smoothbore (shotguns), rifled (rifles/pistols), or partially rifled (like Paradox barrels, which are smoothbore with rifling only at the muzzle end).
Q103
🔬 Forensic ScienceShotguns
Which of the following statements are true for shotguns?
i. A shotgun is a short-range firearm. ii. Shotgun gives accurate aim when a single projectile is fired iii. Spreading of pellets increases with increase in range of fire.
💡Correct Answer: Option B (i & iii)
Statements i and iii are true. A shotgun is typically a short-range weapon, and pellet dispersion increases with range. Statement ii is incorrect because smoothbore shotguns are generally inaccurate when firing a single projectile (slug) compared to rifled barrels.
Q104
🔬 Forensic ScienceAmmunition
The active constituents of smokeless powder are?
i. Nitroglycerine. ii. Nitrocellulose. iii. Sulphur.
💡Correct Answer: Option A (i & ii)
Smokeless powder consists of Nitrocellulose (single-base) or Nitrocellulose and Nitroglycerine (double-base). Sulphur is a constituent of black powder, not smokeless powder.
Q105
🔬 Forensic ScienceAmmunition
In firearms, the powders with increasing rate of burning are called as:
💡Correct Answer: Option D (Progressive powder)
Progressive burning powder is designed to burn at an increasing rate as it travels, which helps maintain high pressure behind the bullet inside the barrel.
Q106
🔬 Forensic ScienceAmmunition
Which of the following are the constituents of gunpowder?
i. Sodium Nitrate ii. Sulphur iii. Charcoal.
💡Correct Answer: Option D (i, ii & iii)
Traditional gunpowder (black powder) consists of an oxidizer (potassium nitrate or alternatively sodium nitrate in industrial blasting powders) combined with sulphur and charcoal.
Q107
🔬 Forensic ScienceAmmunition
Which of the following statements are true for gun powder?
i. Suitable for high velocity ammunition ii. It gives irregular ballistics iii. Leaves considerable amount of solid residue
💡Correct Answer: Option C (ii & iii)
Statements ii and iii are true. Gunpowder (black powder) is unsuitable for modern high-velocity ammunition because it burns too rapidly, has irregular ballistics, and leaves behind about 55% solid fouling residue.
Q108
🔬 Forensic ScienceFiring Process
Arrange the following process of firing in increasing order of chronology.
i. Triggering ii. Striking percussion cap iii. Hammer release iv. Ignition of propellent
💡Correct Answer: Option A (i, iii, ii, iv)
The correct sequence of events when firing a gun is: first the trigger is pulled/triggering (i), which releases the hammer (iii), causing the firing pin to strike the percussion cap (ii), leading to the ignition of the propellant (iv).
Q109
🔬 Forensic ScienceGSR Analysis
Match the following:
List-I (Detectable Metal) i. Antimony ii. Copper iii. Iron iv. Nitrates
List-II (Source) a. Primers b. Barrel c. Propellants d. Bullet jacket
💡Correct Answer: Option D (i-a, ii-d, iii-b, iv-c)
List-I (Test) i. Dermal Nitrate Test ii. Harrison and Gilroy's Test iii. Price's Spot Test iv. Walker's Test
List-II (Reagent) a. Diphenylamine b. 2 naphthylamine c. Triphenylmethyl arsonium iodide d. Sodium rhodizonate
💡Correct Answer: Option D (i-a, ii-d, iii-c, iv-b)
The correct matches are: Dermal Nitrate Test uses Diphenylamine (i-a); Harrison and Gilroy's Test uses Sodium Rhodizonate (ii-d); Price's Spot Test uses Triphenylmethyl arsonium iodide (iii-c); Walker's Test uses 2-naphthylamine (iv-b).
Q111
🔬 Forensic ScienceWound Ballistics
Match the following:
List-I (Bullet Velocity Zone) i. Under 400 m/s ii. 400 to 600 m/s iii. 600 to 1100 m/s iv. Beyond 1100 m/s
List-II (Wounding phenomena) a. Instantaneous death b. Explosive wound c. No abnormal wounding phenomena d. Expanding bullets starts mushrooming
💡Correct Answer: Option D (i-c, ii-d, iii-b, iv-a)
The correct matches are: Under 400 m/s - No abnormal wounding phenomena (i-c); 400 to 600 m/s - Expanding bullets starts mushrooming (ii-d); 600 to 1100 m/s - Explosive wound (iii-b); Beyond 1100 m/s - Instantaneous death (iv-a).
Q112
🔬 Forensic ScienceTrajectory
The vertical range is maximum at angle of projection equal to
💡Correct Answer: Option D (90°)
The maximum vertical height (range) is obtained when a projectile is fired straight up, which corresponds to an angle of 90°.
Q113
🔬 Forensic ScienceExternal Ballistics
Drag becomes equal to the projectile's weight after which the projectile falls with a constant velocity known as
💡Correct Answer: Option B (Terminal velocity)
When the downward force of gravity (weight) equals the upward air resistance (drag), the net force becomes zero, and the projectile falls at a constant terminal velocity.
Q114
🔬 Forensic ScienceWound Ballistics
The range which commences beyond the limit of flame zone and extends up to the distance to which the gunpowder residues could be projected in the area surrounding the wound of entrance is
💡Correct Answer: Option C (Near range)
The 'Near range' (or close range) is the zone beyond the burning flame where unburnt/semi-burnt gunpowder particles are projected, creating powder tattooing (stippling) on the skin.
Q115
🔬 Forensic ScienceAmmunition
Following is not the part of ammunition
💡Correct Answer: Option A (Barrel)
The barrel is a mechanical part of the firearm itself, while the cartridge case, bullet, and primer are components of the ammunition.
Q116
🔬 Forensic ScienceHistory of Firearms
Arrange the following firearms with chronological order of their invention.
i. Match Lock ii. Wheel Lock iii. Hand Canon iv. 0.303 SLR
💡Correct Answer: Option B (iii, i, ii, iv)
The correct chronological sequence of inventions is: Hand Cannon (14th century, iii) -> Matchlock (15th century, i) -> Wheellock (16th century, ii) -> 0.303 SLR (20th century, iv). This corresponds to order: iii, i, ii, iv.
Q117
🔬 Forensic ScienceTrajectory
The horizontal range of a projectile when projected with same velocity at angle of projections 30° and 60° is
💡Correct Answer: Option C (Same)
The horizontal range equation is R = (v² sin(2θ)) / g. Since sin(230°) = sin(60°) and sin(260°) = sin(120°) = sin(60°), complementary angles of projection yield the exact same horizontal range.
Q118
🔬 Forensic ScienceRifling
The process of cutting the lands and groove inside the barrel of a firearm is called as
💡Correct Answer: Option D (Rifling)
Rifling is the process of cutting helical grooves (creating lands and grooves) inside the bore of a firearm barrel to impart spin and stabilize the bullet.
Q119
🔬 Forensic ScienceAmmunition
Ammunition of rifles firearm DOES NOT contain
💡Correct Answer: Option D (Wads)
Wads are cylindrical cardboard, plastic, or felt barriers used in shotgun shells to separate the powder and pellets. Rifle cartridges do not contain wads.
Q120
🔬 Forensic ScienceHistory of Firearms
Snaphaunce and Miquelet are the types of
💡Correct Answer: Option D (Flint lock)
Snaphaunce and Miquelet are early historic variations and developments of the Flintlock ignition mechanism.
Q121
🔬 Forensic ScienceInternal Ballistics
Which of the following is not the factor affecting on the internal ballistics?
💡Correct Answer: Option D (Wind deflection.)
Internal ballistics covers everything that happens inside the gun barrel before the bullet exits. Wind deflection occurs in flight, which is part of external ballistics.
Q122
🔬 Forensic ScienceInternal Ballistics
The velocity of the bullet when it just exits the barrel of the firearm is called
💡Correct Answer: Option C (Muzzle velocity)
Muzzle velocity is the speed at which a projectile exits the muzzle (the end of the barrel) of a firearm.
Q123
🔬 Forensic ScienceAmmunition
Dum-Dum bullets were first manufactured at
💡Correct Answer: Option A (Calcutta)
Dum-Dum (expanding) bullets were first designed and manufactured in the late 19th century at the British Indian Army Arsenal located in Dum Dum near Calcutta (Kolkata).
Q124
🔬 Forensic ScienceFirearms
A symbol and/or series of letters and/or numbers stamped into a firearm or gun is called as
💡Correct Answer: Option D (Proof marks)
Proof marks are symbols or letters stamped into the barrel or action of a firearm indicating it has passed high-pressure safety testing (proof house testing). Head stamps are on ammunition casings, not the gun.
Q125
🔬 Forensic ScienceBallistics
The phenomenon of deflection of bullet due to striking a solid target at low angle
💡Correct Answer: Option C (Ricochet)
Ricochet is the rebound, bounce, or deflection of a projectile off a flat or solid surface at a shallow angle.
Q126
🔬 Forensic ScienceAmmunition
The function of primer is
💡Correct Answer: Option A (To ignite the main charge)
The primer contains a small amount of sensitive primary explosive that detonates upon impact, sending a flame to ignite the main propellant powder charge.
Q127
🔬 Forensic SciencePrimers
Which one is used as a primer
💡Correct Answer: Option D (Lead azide)
Lead azide is a highly sensitive primary explosive commonly used in primer caps to initiate detonation upon mechanical impact.
Q128
🔬 Forensic ScienceShotguns
Wad in the cartridge serves the purpose of:
💡Correct Answer: Option D (To prevent from jerk)
The wad serves as a cushion and barrier in shotgun shells. The compressible section of the wad helps absorb the initial peak shock wave (the 'jerk') upon ignition, protecting the barrel and stabilizing pressure.
Q129
🔬 Forensic ScienceRifling
Degree of twist in case of rifling is called as
💡Correct Answer: Option A (Pitch)
The pitch of rifling is the distance inside the barrel over which the lands and grooves make one complete helical turn (360 degrees rotation).
Q130
🔬 Forensic ScienceGSR Analysis
Lead in discharge residue best identified by
💡Correct Answer: Option C (X-ray radiography)
Lead is highly radiopaque. In forensic medicine and ballistics, X-ray radiography is highly effective for identifying the presence, path, and deposits of lead residue/bullets in tissue.
Q131
🔬 Forensic ScienceFirearms
Backward movement of firearm during firing is termed as
💡Correct Answer: Option B (Recoil)
Recoil is the rearward movement of a firearm caused by Newton's third law of motion (action and reaction) when the bullet is projected forward.
Q132
🔬 Forensic ScienceTerminal Ballistics
The velocity of bullet at the time of impact is called as
💡Correct Answer: Option C (Striking velocity)
Striking velocity is the speed of the projectile at the exact instant it hits the target.
Q133
🔬 Forensic ScienceTerminal Ballistics
Penetration of bullet inside the target depends on
i. Cross sectional area of projectile ii. Velocity of projectile iii. Weight of projectile
💡Correct Answer: Option D (i, ii & iii)
Penetration depth depends on the sectional density (weight / cross-sectional area) and the kinetic energy (which depends on velocity). Therefore, all three factors affect penetration.
Q134
🔬 Forensic ScienceExternal Ballistics
The factor affects the path of the projectile are
i. Air resistance ii. Force of gravity iii. Spin
💡Correct Answer: Option D (i, ii & iii)
The trajectory (path) of a bullet is affected by gravity (vertical drop), air resistance/drag (loss of speed), and gyroscopic spin (stabilization and drift).
Q135
🔬 Forensic ScienceExternal Ballistics
Air resistance affects least to
💡Correct Answer: Option D (Boat tailed bullets)
Boat-tailed bullets have a tapered base that reduces base drag and turbulence, experiencing the least overall air resistance compared to flat-base or round-nose designs.
Q136
🔬 Forensic ScienceExternal Ballistics
The tendency of a projectile to suck backward to fill up the vacuum is called as
💡Correct Answer: Option B (Base drag)
Base drag is the aerodynamic drag caused by the low pressure/vacuum area formed behind the flat base of a moving bullet, which pulls it backward.
Q137
🔬 Forensic ScienceTrajectory
The angle between the direction of motion of projectile and central axis of projectile is called as
💡Correct Answer: Option A (Yaw)
Yaw is the angle between the longitudinal axis of the projectile and its actual vector of travel.
Q138
🔬 Forensic ScienceTrajectory
The lateral deviation of trajectory of projectile from the plane of departure is known as
💡Correct Answer: Option B (Drift)
Drift is the lateral (sideways) deviation of a spinning bullet from the vertical plane of departure, primarily caused by gyroscopic spin and air interaction.
Q139
🔬 Forensic ScienceGSR Analysis
The most impressive and effective method to evaluate GSR is
💡Correct Answer: Option C (Scanning Electron Microscope)
Scanning Electron Microscopy with Energy-Dispersive X-ray (SEM-EDX) is the gold standard for GSR analysis because it allows identification of both the chemical composition and the spherical morphology of individual particles.
Q140
🔬 Forensic ScienceWound Ballistics
Scorching is also known as
i. Singeing ii. Burning iii. Charring
💡Correct Answer: Option D (i, ii & iii)
Scorching (the thermal damage caused by muzzle flash gases) is also referred to as singeing (specifically for hair) or burning/charring (for fibers and tissue).
Q141
🔬 Forensic ScienceWound Ballistics
Tattooing is also known as
i. Blackening ii. Peppering iii. Stippling
💡Correct Answer: Option C (ii & iii)
Tattooing is the embedding of unburnt powder grains in the skin, which is also known as stippling or peppering. Blackening is the deposit of soot/smoke, which can be wiped off, unlike tattooing.
Q142
🔬 Forensic ScienceShotguns
The mathematical relation between diameter of dispersed pellets (D) and range (R) of fire of a half choke standard firearms is
💡Correct Answer: Option B (D=3R)
In standard ballistics, the pattern diameter (D in cm) for a half-choke shotgun is roughly 3 times the range of fire (R in meters): D = 3R. (Contrast: Cylinder is 4R, Full choke is 2R/2.5R).
Q143
🔬 Forensic ScienceWound Ballistics
Which of the following are characteristics wounds caused by firearms?
i. Rat holes ii. Key holes iii. Explosive wound
💡Correct Answer: Option D (i, ii & iii)
All three are characteristic gunshot wounds: Rat holes (close-range shotgun wound), Key holes (tumbling bullet entries), and Explosive wounds (high-velocity or contact head wounds).
Q144
🔬 Forensic ScienceTerminal Ballistics
Penetration power of a firearm and its ammunition is measured from the penetration of the projectile in
💡Correct Answer: Option B (Soft pine wood)
Historically, the standard material used to empirically measure and compare the penetration power of bullets is dry, soft pine wood boards of a standard thickness.
Q145
🔬 Forensic ScienceBallistics
The distance up to which a shooter can take aim and make a kill is called as
💡Correct Answer: Option C (Effective range)
Effective range is the maximum distance at which a shooter can reasonably expect to hit and disable/kill a target using the weapon system.
Q146
🔬 Forensic ScienceForensic Science
Which of the following is called "Locard's Principle of Exchange"?
💡Correct Answer: Option C (Every contact leaves a trace)
Locard's Exchange Principle states that 'every contact leaves a trace', which forms the fundamental basis of trace evidence and crime scene investigation.
Q147
🔬 Forensic ScienceForensic Anthropology
Under which of the following branches of forensic science are age estimations from skeletal remains (bones) carried out?
💡Correct Answer: Option B (Anthropology)
Forensic Anthropology is the application of the anatomical science of anthropology and its various subfields in a legal setting, including estimating age, sex, stature, and ancestry from skeletal remains.
Q148
🔬 Forensic ScienceForensic Science
The concept of anthropometry was given by which of the following scientists?
💡Correct Answer: Option D (Alphonse Bertillon)
Alphonse Bertillon developed anthropometry (also known as Bertillonage), which was a system of physical measurements of body parts used by police to identify criminals.
Q149
🔬 Forensic ScienceForensic Institutions
The Central Forensic Science Laboratory, Hyderabad was established in which of the following year?
💡Correct Answer: Option B (1967)
The Central Forensic Science Laboratory (CFSL) in Hyderabad was established in 1967.
Q150
🔬 Forensic ScienceForensic Institutions
Which of the following is the most recent Central Forensic Science Laboratory established in 2011?
💡Correct Answer: Option D (CFSL, Guwahati)
The CFSL in Guwahati, along with Bhopal and Pune, was established in 2011 under the Ministry of Home Affairs.
Q151
🧬 BiologyQuestioned Documents
The Government Examiner of Questioned Documents (GEQD) was shifted to 1906 in which of the following places?
💡Correct Answer: Option B (Shimla)
The office of the Government Examiner of Questioned Documents (GEQD), initially setup in Bengal in 1904, was shifted to Shimla in 1906.
Q152
🔬 Forensic ScienceForensic Administration
The National Crime Records Bureau (NCRB) was started under the Ministry of Home Affairs in which of the following years?
💡Correct Answer: Option C (1986)
The National Crime Records Bureau (NCRB) was established in 1986 to empower Indian Police with information technology and criminal databases.
Q153
🔬 Forensic ScienceForensic Technology
The automated multi-modal identification system (AMBIS) was first launched by which of the following states?
💡Correct Answer: Option A (Maharashtra)
Maharashtra was the first state in India to launch the Automated Multimodal Biometric Identification System (AMBIS) in 2019 to digitize criminal fingerprint and biometric data.
Q154
🔬 Forensic ScienceForensic Physics
Examination of soil is carried out in which of the following forensic science laboratory divisions?
💡Correct Answer: Option C (Physics)
Forensic examination of soil, glass, paint, and fibers is typically handled by the Physics (or Trace Evidence) division of the Forensic Science Laboratory.
Q155
🔬 Forensic ScienceCrime Scene Management
Which of the following is a type of physical evidence?
💡Correct Answer: Option A (Glass)
Glass is a tangible object (physical evidence), while alibis and testimonies represent oral or testimonial evidence.
Q156
🔬 Forensic ScienceCrime Scene Management
The following steps are involved in the crime scene processing:
i. Packaging of evidence ii. Collection of evidence iii. Securing the crime scene iv. Sketching and videography of the crime scene
Which of the following sequence/order is correct beginning from the first step?
💡Correct Answer: Option A (iii, iv, ii, i)
The standard sequence of crime scene processing is: first securing the scene (iii), documenting via sketching and photography (iv), collecting evidence (ii), and then packaging it (i).
Q157
🔬 Forensic ScienceCrime Scene Management
After a culprit murders a person in a house and then burns the body in a forest miles away from the house. What is the crime scene where the body is burnt called?
💡Correct Answer: Option C (Secondary crime scene)
The house where the murder occurred is the primary crime scene, and the forest where the body was burned is the secondary crime scene.
Q158
🔬 Forensic ScienceCrime Scene Management
The following steps are involved in crime scene reconstruction:
i. Conjecture ii. Testing and theory formation iii. Data collection iv. Hypothesis testing
Which of the following sequence/order is correct beginning from the first step?
💡Correct Answer: Option C (iii, i, iv, ii)
Crime scene reconstruction involves: Data collection (iii) -> Conjecture/observation (i) -> Hypothesis testing (iv) -> Testing and theory formation (ii).
Q159
🔬 Forensic ScienceCrime Scene Management
Which of the following search methods on the crime scene is a very thorough method for searching for evidence?
💡Correct Answer: Option D (Grid method)
The grid search method is a double-line search that is highly thorough and ensures no area is missed.
Q160
🔬 Forensic ScienceForensic Databases
Consider the following pairs:
i. Fingerprint-AFIS ii. DNA-IBIS iii. Fired bullets - CODIS iv. Paint-PDQ
Which of the components are matched correctly with their databases?
💡Correct Answer: Option D (i and iv only)
AFIS is for fingerprints (i) and PDQ is for paint chemistry (iv). CODIS is the DNA database, and IBIS is for ballistics/fired bullets.
Q161
🔬 Forensic ScienceCrime Scene Management
Which of the following is a type of macroscopic crime scene?
💡Correct Answer: Option C (House of crime)
A macroscopic crime scene refers to large-scale scenes (like a house, building, or field), whereas microscopic scenes refer to trace evidence (GSR, hair, pollen).
Q162
🔬 Forensic ScienceCrime Scene Management
Which of the following is a measurement technique used to sketch a crime scene?
💡Correct Answer: Option C (Polar coordinates)
Polar coordinates is a mapping method using distance and angles from a single reference point to locate evidence.
Q163
🔬 Forensic ScienceForensic Ethics
Which of the following is the prime duty of a forensic scientist?
💡Correct Answer: Option C (To provide honest scientific reports of their analysis)
The primary duty of a forensic scientist is to conduct unbiased scientific analysis and provide objective, honest reports to the court.
Q164
⚗️ ChemistryArson Investigation
How must the charred or burnt debris that may have absorbed accelerants from the crime scene be packaged?
💡Correct Answer: Option A (Airtight containers)
Charred debris from suspected arson must be packaged in airtight containers (like metal cans) to prevent volatile accelerant vapors from evaporating.
Q165
🔬 Forensic ScienceCrime Scene Management
Which of the following is a type of paper packaging method used for evidence?
💡Correct Answer: Option B (Druggist's fold)
A druggist's fold (or pharmacist's fold) is a folding pattern used to secure small amounts of trace evidence (like hair, powder, fibers) in paper without leakage.
Q166
🧬 BiologyImpression Evidence
Which of the following is a type of impression evidence?
💡Correct Answer: Option A (Tire marks)
Tire marks are impressions left by a tire on a soft surface, which can be cast or photographed.
Q167
🔬 Forensic ScienceCrime Scene Management
Blood evidence is packaged in which of the following containers to avoid microbial contamination?
💡Correct Answer: Option C (Paper bags)
Wet or dry bloodstains should be packaged in paper bags because paper allows remaining moisture to evaporate, preventing mold/microbial growth which degrades DNA.
Q168
⚗️ ChemistryArson Investigation
In arson cases, what does "pyromania" mean?
💡Correct Answer: Option A (Obsessive and impulsive desire to set things on fire)
Pyromania is an obsessive, impulsive disorder characterized by the deliberate and repetitive setting of fires.
Q169
⚗️ ChemistryArson Investigation
While investigating an arson crime scene, what can indicate the possible area of origin of the fire?
💡Correct Answer: Option D (Area with maximum damage)
The area of origin in a fire scene typically exhibits the longest exposure to fire, resulting in the maximum amount of charring and structural damage.
Q170
🔬 Forensic ScienceCrime Scene Management
What is a specimen for example a hair sample whose origin is known with certainty and is used for comparison called?
💡Correct Answer: Option A (Standard sample)
A sample whose origin is known with certainty (like hair taken directly from a suspect's head) is called a standard or known sample.
Q171
🧬 BiologyImpression Evidence
Which of the following is a type of individual characteristic of physical evidence, a shoe?
💡Correct Answer: Option B (Wear and tear Of the sole of the shoe)
Individual characteristics are unique features (like random cuts, wear, and tears on the sole) that can uniquely identify a specific shoe, as opposed to class characteristics like size or brand.
Q172
🔬 Forensic ScienceCrime Scene Management
What is one of the most effective ways of documenting the location of evidence on a bomb blast explosion scene?
💡Correct Answer: Option A (Polar coordinates)
Polar coordinates are highly effective for mapping expansive, outdoor explosion scenes where there may be a single center of explosion but few rectangular walls.
Q173
⚗️ ChemistryExplosives
Sampling of residue deposited on an item in an explosive scene can be collected by vigorously swabbing the surface with several swabs moistened with which of the following?
💡Correct Answer: Option C (Distilled water)
Forensic protocols specify using swabs moistened with distilled water (for inorganic residues/salts) or specific solvents like methanol/ethanol for organic explosive residues. In general, distilled water is the standard safe choice.
Q174
🧬 BiologyAlternate Light Source
The trace evidence sometimes fluoresces under UV light used at the crime scene. What is its range?
💡Correct Answer: Option A (100-400 nm)
The ultraviolet (UV) electromagnetic spectrum ranges from 100 nm to 400 nm.
Q175
🔬 Forensic ScienceCrime Scene Management
Which of the following is an example of trace evidence found on a crime scene?
💡Correct Answer: Option A (Fiber)
Trace evidence refers to microscopic physical evidence transferred during a crime, such as fibers, hair, soil, or glass fragments.
Q176
🔬 Forensic ScienceCrime Scene Safety
After processing the crime scene, the Personal Protection Equipment (PPE) has to be removed in a sequence. Consider the following sequence.
i. Outer gloves, if double-gloved ii. Booties if separate from overgarments iii. Surgical mask iv. Eye protection
Which of the following sequences is correct starting from the first to be removed the last?
💡Correct Answer: Option C (i, ii, iv, iii)
The proper sequence to remove PPE to avoid contamination is: outer gloves (i), booties (ii), eye protection (iv), and surgical mask last (iii) to prevent inhalation of airborne contaminants.
Q177
🧬 BiologyLaw of Evidence
Consider the following statements pertaining importance of physical evidence.
i. Physical evidence can be tested by an independent forensic expert ii. Physical evidence is subjected to memory loss iii. Physical evidence can provide a link between the crime scene and the suspect iv. Physical evidence changes according to the statements of the defendant
Which of the above statements is true/correct?
💡Correct Answer: Option C (i only)
Statement i is true as physical evidence can be independently tested. Statement iii is also true, but among the options provided, only 'i only' is available as a single correct choice.
Q178
🔬 Forensic ScienceForensic Science
Consider the following pairs:
i. Toxicology evidence - Friction ridge ii. Questioned document evidence - Handwriting iii. Biological evidence - Semen iv. Fingerprint evidence - Poison
Which of the above evidences are correctly matched?
💡Correct Answer: Option C (ii and iii only)
Handwriting relates to questioned documents (ii) and semen relates to biological evidence (iii). Friction ridges relate to fingerprints, and poisons relate to toxicology.
Q179
🧬 BiologyPhysical Evidence
Consider the following pairs:
i. Fingerprints - Striations in marks ii. Toolmarks - Minutiae patterns iii. Footwear - Wear damage to sole iv. Handwriting- Hiatus
Which of the physical evidence is correctly matched with their individual characteristics?
💡Correct Answer: Option A (iii and iv only)
Footwear sole wear/damage (iii) and a hiatus in handwriting (iv) are individual characteristics. Minutiae are for fingerprints, and striations are for toolmarks/bullets.
Q180
🧬 BiologyAdmissibility of Evidence
Which of the following criteria is related to the admissibility of evidence?
💡Correct Answer: Option D (Daubert criteria)
The Daubert standard/criteria is used in US federal courts to determine whether expert witness testimony and scientific evidence is admissible.
Q181
🧬 BiologyPhysical Evidence
Which of the following evidences have the power of individualization?
💡Correct Answer: Option D (DNA profile)
Only a DNA profile has the power to uniquely identify (individualize) a specific person to the exclusion of all others. Blood groups and clothing brands are class characteristics.
Q182
🧬 BiologyLaw of Evidence
Section 60 of IPC relates to which of the following?
💡Correct Answer: Option A (Oral evidence must be direct)
The question refers to Section 60 of the Indian Evidence Act, 1872, which states that 'Oral evidence must, in all cases whatever, be direct'.
Q183
🧬 BiologyWildlife Protection
Which act deals with the protection and conservation of various species of birds and animals in India?
💡Correct Answer: Option A (Wildlife Conservation Act 1972)
The Wildlife (Protection) Act, 1972 in India deals with the protection of wild animals, birds, and plants.
Q184
⚛️ PhysicsMicroscopy
What is the part of the microscope under the stage which focuses light on the specimen called?
💡Correct Answer: Option B (Condenser)
The condenser is situated beneath the stage and functions to collect and focus light from the light source onto the specimen.
Q185
⚛️ PhysicsMicroscopy
The ability of an objective lens to resolve details into separate images instead of one blurred image is directly proportional to?
💡Correct Answer: Option C (Numerical Aperture)
Resolution (R) is directly proportional to the Numerical Aperture (NA) of the objective lens: R = λ / (2 * NA).
Q186
⚛️ PhysicsMicroscopy
Which of the following microscopes gives a three-dimensional view of evidence?
💡Correct Answer: Option B (Stereomicroscope)
A stereomicroscope (dissecting microscope) uses separate optical paths for each eye to provide a 3D view of the specimen.
Q187
⚛️ PhysicsMicroscopy
Which of the following microscopes are used to observe birefringent evidence like fibers?
💡Correct Answer: Option A (Polarizing light microscope)
A polarizing light microscope utilizes polarized light to study the birefringent (optical refraction) properties of materials like fibers and minerals.
Q188
⚛️ PhysicsMicroscopy
Consider the following statements related to the microscope.
i. Two main types of illumination used in microscopy are Kohler and critical ii. The lens closest to the specimen is called an ocular lens iii. The lens closest to the eyes is called an objective lens iv. The lens closest to the specimen is called an objective lens
Which of the statements are true/correct?
💡Correct Answer: Option B (i and iv only)
Kohler and critical are indeed types of illumination (i). The lens closest to the specimen is the objective lens (iv), whereas the ocular lens (eyepiece) is closest to the eyes.
Q189
⚛️ PhysicsMicroscopy
Which of the following microscopes does a forensic scientist use to observe two different samples of evidence at the same time?
💡Correct Answer: Option D (Comparison microscope)
A comparison microscope consists of two independent microscopes joined by an optical bridge, allowing side-by-side comparison of two specimens (e.g. bullets, hair).
Q190
⚛️ PhysicsMicroscopy
Which of the following microscopes gives the forensic scientist power to observe as well as plot the infrared absorption spectrum of the material?
💡Correct Answer: Option C (Microspectrophotometer)
A microspectrophotometer combines a microscope with a spectrophotometer, allowing the analysis of light absorption (like UV-Vis or IR spectra) of microscopic samples.
Q191
🧬 BiologySemen Analysis
Which of the following is the major protein present in seminal fluid at concentrations of 0.5-2.0 mg/mL?
💡Correct Answer: Option B (Prostate Specific Antigen)
Prostate-Specific Antigen (PSA or p30) is present in seminal fluid at concentrations of 0.5–2.0 mg/mL, serving as a key marker for semen detection. Semenogelins are present in much higher concentrations (10-20 mg/mL).
Q192
🧬 BiologySemen Analysis
What compound acts as the substrate in the Fast Blue B test for semen detection?
💡Correct Answer: Option A (a-naphthyl phosphate)
In the Brentamine (Fast Blue B) test, alpha-naphthyl phosphate acts as the substrate for acid phosphatase, releasing alpha-naphthol which reacts with the dye to form a purple color.
Q193
🧬 BiologyUrine Detection
DMAC assay is a presumptive assay for body fluid detection. What does it detect?
💡Correct Answer: Option A (Urea in urine)
The DMAC (p-dimethylaminocinnamaldehyde) assay reacts with urea, which is present in high concentrations in urine, to produce a pink/red color.
Q194
🧬 BiologyEpithelial Cells
Epithelial cell detection is often indicative of the presence of various body fluids. What stain can be used to distinguish between skin, oral and vaginal epithelial cells?
💡Correct Answer: Option C (Dane's)
Dane's staining method is used to differentiate skin (keratinized), oral, and vaginal epithelial cells based on color differences related to keratinization.
Q195
🧬 BiologySpermatozoa Staining
Match the column of the part of spermatozoa to the colour stained in Christmas tree staining.
💡Correct Answer: Option B (i-q, ii-r, iii-s, iv-p)
In the Christmas Tree Stain (nuclear fast red/picroindigocarmine), the acrosomal cap is pink (i-q), the nucleus is red (ii-r), the tail is green (iii-s), and the midpiece is blue (iv-p).
Q196
🧬 BiologySaliva Analysis
Which gland produces majority of saliva in humans?
💡Correct Answer: Option A (Submandibular glands)
The submandibular glands produce approximately 65-70% of the total unstimulated saliva in humans, followed by the parotids.
Q197
🧬 BiologyVaginal Secretions
What are the predominant bacteria in the vagina of women of reproductive age?
💡Correct Answer: Option B (Lactobacilli spp)
Lactobacillus species are the dominant members of the vaginal microbiota in healthy women of reproductive age, keeping the pH acidic to protect against infections.
Q198
🧬 BiologyLewis Blood Group
Which of the following statements pertaining to the Lewis antigen system is INCORRECT?
💡Correct Answer: Option C (Lewis Ags expression is influenced by LEW1 and LEW2 genes)
The Lewis antigen expression is governed by the FUT3 (Lewis) and FUT2 (Secretor) genes on chromosome 19. There are no genes named LEW1 and LEW2.
Q199
🧬 BiologyRh System
Hemolytic Disease of the Newborn occurs when -
💡Correct Answer: Option D (An Rh negative mother becomes pregnant with an Rh positive fetus for the second time)
Erythroblastosis fetalis (HDN) occurs when an Rh-negative mother carries an Rh-positive fetus. In subsequent pregnancies, maternal antibodies cross the placenta and attack fetal RBCs.
Q200
🧬 BiologyWildlife Conservation
IUCN stands for
💡Correct Answer: Option C (International Union for Conservation of Nature)
IUCN stands for the International Union for Conservation of Nature, an international organization working in the field of nature conservation and sustainable use of natural resources.
Q201
🔬 Forensic ScienceForensic Botany
Which of the following statements pertaining to use of palynomorphs in forensics is INCORRECT?
💡Correct Answer: Option B (Recovery of diatoms from stomach alone indicates death by drowning)
Finding diatoms in the stomach alone does not prove drowning, as diatoms can be swallowed with drinking water. Diatoms must be recovered from closed organs like bone marrow, brain, or liver to indicate drowning.
Q202
⚗️ ChemistryImmunoassays
In an immunochromatography assay, what would the control zone comprise of?
💡Correct Answer: Option B (Immobilised unlabelled antiglobulin)
The control line contains immobilized antiglobulin antibodies (e.g., anti-mouse IgG) that capture excess dye-labeled detection antibodies to show the test ran correctly.
Q203
⚗️ ChemistryImmunoassays
Arrange the steps of immunoprecipitation in the right order:
i. Elution ii. Binding of antigen and antibody iii. Immobilisation of primary antibody on a matrix
💡Correct Answer: Option D (iii, ii, i)
The correct sequence for immunoprecipitation is: first immobilizing the antibody on a solid support (iii), then binding the antigen/target (ii), and finally eluting the purified antigen (i).
Q204
🧬 BiologyDiatoms
What is the salicaceous outer covering of the diatom called?
💡Correct Answer: Option A (Frustule)
The silica-rich, hard outer cell wall of a diatom is called a frustule.
Q205
🔬 Forensic ScienceForensic Botany
Cannabis plants are often grown indoors illegally. Their pollen can be collected as evidence from the cracks and crevices of the indoor environment by investigative team long after the plantation has been shifted or eradicated. What type of pollination does Cannabis exhibit?
💡Correct Answer: Option B (Anemophilous)
Cannabis is an anemophilous (wind-pollinated) plant, producing lightweight pollen that disperses easily and lingers in cracks and indoor spaces.
Q206
🧬 BiologyWildlife Conservation
According to IUCN Red List, Endangered species are defined as
💡Correct Answer: Option A (Species that possess a very high risk of extinction because of rapid population declines of 50 to more than 70 percent over the previous 10 years)
Under IUCN criteria, Endangered (EN) species are those facing a very high risk of extinction due to a population decline of 50% to 70% or more over 10 years.
Q207
🧬 BiologyForensic Biology
In what region of the spermatozoa is the mitochondria placed?
💡Correct Answer: Option C (Mid piece)
The mitochondria are spirally arranged in the midpiece of the spermatozoon, providing energy (ATP) for sperm motility.
Q208
🧬 BiologyBlood Groups
What antigen system does the FUT 1 and FUT 2 gene expression together determine?
💡Correct Answer: Option A (ABO antigens)
FUT1 (H gene) and FUT2 (Secretor gene) determine the H antigen precursor, which forms the substrate for the A and B transferases in the ABO blood group system.
Q209
🧬 BiologyWildlife Forensics
Establishing geographical location of a wildlife species is crucial to legislative actions. How can this be achieved?
💡Correct Answer: Option C (By identifying reproductive population)
To enforce regional protections (such as CITES appendices or regional laws), identifying the breeding/reproductive population of origin is the primary way to establish the geographic origin of a specimen.
Q210
🔬 Forensic ScienceForensic Medicine
What stage marks the beginning of putrefaction during decomposition in a terrestrial environment?
💡Correct Answer: Option B (Bloated stage)
The bloated stage is characterized by the accumulation of gases produced by anaerobic bacteria during putrefaction, marking its overt beginning.
Q211
🔬 Forensic ScienceForensic Entomology
Which of the following statements are TRUE?
i. Insect colonisation occurs slower if body is completely burnt. ii. Insect colonisation is influenced by the biogeoclimatic zone iii. Exposure to sunlight causes faster depletion of resources by the insects.
💡Correct Answer: Option D (i, ii and iii)
All statements are true: Charring limits/slows early fly colonization (i); different climate zones affect insect species (ii); and sunlight speeds up larval metabolism and carcass depletion (iii).
Q212
🔬 Forensic ScienceForensic Entomology
Arrange the sequence of steps you will perform as a forensic entomologist in an outdoor crime scene:
i. Collection of live adult flies ii. Collection of soil temperatures under the body after its removal iii. Photography, notations of the overall crime scene from a safe distance iv. Collection of insects on the body
💡Correct Answer: Option C (iii, i, iv, ii)
First photograph the scene (iii), catch flying adult insects before they disperse (i), collect crawling insects/maggots from the remains (iv), and lastly collect soil temperatures beneath the body once it is moved (ii).
Q213
🧬 BiologyDrowning
During autopsy of a body found in a lake, diatoms were found in the bone marrow. Which of the following assumptions is most valid?
💡Correct Answer: Option B (The water was aspirated while the victim was still alive)
Diatoms entering the bone marrow requires active circulation, proving that the victim aspirated water containing diatoms while still alive.
Q214
🧬 BiologyWildlife Protection
Appendix II of CITES includes
💡Correct Answer: Option C (Species not necessarily threatened with extinction, but in which trade must be controlled)
Appendix II of CITES lists species that are not currently threatened with extinction but may become so unless trade is strictly regulated.
Q215
🧬 BiologySerology
In Ouchterlony assay, what would the appearance of a Y-shaped precipitin reaction indicate?
💡Correct Answer: Option C (Partial identity)
In the Ouchterlony double diffusion assay, a Y-shaped precipitin pattern (with a spur) indicates partial identity (shared epitopes but distinct ones as well).
Q216
🧬 BiologySerology
Which of the following is a quantitative assay?
💡Correct Answer: Option A (Rocket immunoelectrophoresis)
Rocket immunoelectrophoresis is a quantitative technique where the height of the rocket-shaped precipitin curve is directly proportional to the antigen concentration.
Q217
🧬 BiologyBlood Groups
The IA and IB are both expressed dominantly to produce AB blood group phenotype. What inheritance pattern does this example follow?
💡Correct Answer: Option C (Codominance)
Codominance occurs when both alleles are fully expressed in the heterozygote, as seen in individuals with the AB blood group expressing both A and B antigens.
Q218
🧬 BiologySerology
Which of the following is a primary binding assay?
💡Correct Answer: Option B (Western blotting)
Western blotting directly detects the primary binding between an antigen and a labeled antibody, whereas others are secondary assays depending on precipitation or agglutination.
Q219
🔬 Forensic ScienceForensic Botany
During processing of pollen samples from soil, what is the chemical used to remove silica?
💡Correct Answer: Option C (Hydrofluoric acid)
Hydrofluoric acid (HF) is used in palynology to dissolve silicate minerals and release pollen grains from soil/sediment samples.
Q220
🔬 Forensic ScienceForensic Entomology
The first effort at determining the PMI with the help of entomology in the 1850s was done by studying insect succession and life cycle. Who was the scientist behind this?
💡Correct Answer: Option D (Louis Bergeret)
In 1855, French physician Louis Bergeret d'Arbois was the first to apply insect succession to estimate the post-mortem interval (PMI) of a mummified infant's remains.
Q221
🔬 Forensic ScienceForensic Entomology
If the Accumulated Degree Hours (ADH) in three days is 3672, then how many ADH of 70 degree are there in these 3 days?
💡Correct Answer: Option B (52.45 hours)
To find the corresponding hours at a constant 70 degrees: Hours = ADH / Temp = 3672 / 70 = 52.45 hours.
Q222
🔬 Forensic ScienceForensic Entomology
State which of the statements are true?
i. Insects can indicate movement of body from rural to urban areas ii. Insect colonisation patterns help determine wound sites iii. Unwrapped and wrapped carcasses will show similar insect colonisation patterns iv. In general, more beetles are found in the indoor environment, and more flies outdoors.
💡Correct Answer: Option A (i, ii only)
Statements i (rural vs. urban species) and ii (wounds attract unusual egg-laying) are true. Wrapping delays colonization, and fly and beetle distribution varies based on decomposion stage, not simply indoor/outdoor.
Q223
🔬 Forensic ScienceForensic Entomology
Adult flies are
💡Correct Answer: Option A (Positively phototropic)
Adult blowflies are positively phototropic (attracted to light) and are active during daylight hours.
Q224
🔬 Forensic ScienceForensic Entomology
What is the most accurate way of storing live larval samples for entomological identification?
💡Correct Answer: Option D (Container with soil and with food substrate in a pouch)
Rearing live larvae to adults is the most accurate way to identify species. Rearing requires placing them in a container with a pupation medium (like soil or sawdust) and meat/food wrapped in foil or a pouch to keep it fresh.
Q225
🧬 BiologySerology
A prozone effect during a precipitation reaction is observed when
💡Correct Answer: Option B (The concentration of antibody is excessive)
The prozone effect is a false negative result observed in antigen-antibody reactions due to antibody excess.
Q226
🧬 BiologySerology
What type of antigen reacts with an antibody to give agglutination reaction?
💡Correct Answer: Option B (Insoluble)
Agglutination involves particulate or insoluble antigens (like red blood cells or bacteria) clumping together, while precipitation involves soluble antigens.
Q227
🧬 BiologyWildlife Protection
A wildlife poacher is interested in illegal trade of tiger skin. What method of poaching will he prefer?
💡Correct Answer: Option B (Legtraps)
Poachers targeting tiger skins prefer legtraps (jaw traps) because they are silent and do not damage the pelt with bullet holes, ensuring maximum market value.
Q228
🔬 Forensic ScienceForensic Odontology
At the age 12-13 years, when all the second molars have erupted, what would the total number of teeth be?
💡Correct Answer: Option B (28 permanent, 0 temporary)
By age 12-13, all 28 permanent teeth (excluding the 4 wisdom teeth) have erupted, and all primary/temporary teeth have been shed.
Q229
🔬 Forensic ScienceForensic Odontology
Which of the following is NOT a tooth characteristic used for age estimation using Gustafson's method?
💡Correct Answer: Option C (Primary dentine formation)
Gustafson's method utilizes six criteria: Attrition, Periodontosis, Secondary dentin formation, Cementum apposition, Root resorption, and Transparency of the root. Primary dentine formation is not a criteria.
Q230
🔬 Forensic ScienceForensic Odontology
According to the FDI system, what tooth is denoted by the number 28?
💡Correct Answer: Option B (Left maxillary third molar)
In the FDI two-digit notation, quadrant 2 is the upper left (maxillary left) quadrant, and number 8 represents the third molar (wisdom tooth). Thus, 28 represents the left maxillary third molar.
Q231
🔬 Forensic ScienceForensic Anthropology
Who is considered the "Father of Forensic Anthropology"?
💡Correct Answer: Option A (Thomas Dwight)
Thomas Dwight (1843-1911) was an American anatomist whose pioneering research on skeletal identification earned him the title of the Father of Forensic Anthropology.
Q232
🔬 Forensic ScienceForensic Anthropology
Which fontanelle of the human skull closes at birth or up to 6 weeks after birth?
💡Correct Answer: Option A (Lambda)
The posterior fontanelle (Lambda) closes within 1-2 months (up to 6 weeks) after birth. Bregma closes around 18 months.
Q233
🔬 Forensic ScienceForensic Anthropology
Which of the following statements pertaining to the sexual dimorphism in human pelvis is TRUE?
💡Correct Answer: Option B (The pelvic inlet is circular in females and heart-shaped in males)
In the human pelvis, the female pelvic inlet is circular or oval, whereas the male pelvic inlet is heart-shaped to accommodate childbirth.
Q234
🔬 Forensic ScienceForensic Anthropology
Which of the following is categorised as a short bone?
💡Correct Answer: Option A (Carpal)
Carpal bones in the wrist and tarsal bones in the ankle are classified as short bones.
Q235
🔬 Forensic ScienceForensic Anthropology
Which of the following populations has a short dolichocephalic skull?
💡Correct Answer: Option C (Negroid)
Forensic anthropology classifies ancestral skulls into broad groups; Negroid skulls are typically dolichocephalic (long and narrow).
Q236
🔬 Forensic ScienceForensic Odontology
During dental comparison, it was found that in the antemortem findings, tooth number 16 was intact, whereas in the postmortem examination, the same tooth was missing. This is reported as
💡Correct Answer: Option B (Explainable inconsistency)
A tooth present antemortem but missing postmortem is an explainable inconsistency because teeth can be lost postmortem due to decay, extraction, or trauma during or after death.
Q237
🔬 Forensic ScienceForensic Odontology
What part of the tooth is an excellent source of both nuclear and mitochondrial DNA?
💡Correct Answer: Option C (Pulp)
The dental pulp, located in the center of the tooth, is highly protected by the enamel and dentin and serves as an excellent source of both nuclear and mitochondrial DNA.
Q238
🔬 Forensic ScienceForensic Odontology
Which statement pertaining to defensive bitemarks is TRUE?
i. Show a well-defined pattern ii. Are usually singular iii. Show tearing of skin iv. Are most often seen in postmortem bitemarks
💡Correct Answer: Option B (only iii)
Defensive bite marks occur during a violent struggle, meaning they are antemortem (not postmortem) and often ill-defined/distorted, showing tearing of skin due to movement. Only statement iii is correct.
Q239
🔬 Forensic ScienceForensic Odontology
What is the outer covering of the tooth root called?
💡Correct Answer: Option C (Cementum)
Cementum is the specialized calcified substance covering the outer surface of the root of a tooth.
Q240
🔬 Forensic ScienceForensic Odontology
Which is the oldest permanent tooth in oral cavity of human adults?
💡Correct Answer: Option A (First molar)
The permanent first molar (often called the 6-year molar) is the first permanent tooth to erupt, making it the oldest permanent tooth in an adult mouth.
Q241
🔬 Forensic ScienceForensic Odontology
Which of the following is a NOT successional tooth?
💡Correct Answer: Option D (Second molar)
Successional (or succedaneous) teeth are permanent teeth that replace primary teeth. Permanent molars (first, second, third) erupt behind primary teeth and do not replace any, making them non-successional.
Q242
🧬 BiologyCordage Analysis
What is the raised portion of a strand in a twisted cordage called?
💡Correct Answer: Option A (Crown)
In technical cordage terms, the crown is the raised ridge formed by a strand on the surface of a twisted rope.
Q243
🧬 BiologySemen Analysis
What is the excitation range of the Alternate Light Sources used for direct visualisation of seminal stains?
💡Correct Answer: Option B (450-495 nm)
Seminal stains fluoresce brightly under blue light in the range of 450–495 nm, visualized using orange barrier filters/goggles.
Q244
🧬 BiologyFecal Stains
Urobilinoids can be converted to urobilin zinc salt that fluoresces under ALS of 450 nm. This method can be used to spot -
💡Correct Answer: Option D (Fecal stains)
The Edelman test converts urobilinoids present in feces to a green fluorescent zinc-urobilin complex, serving as a test for fecal stains.
Q245
🧬 BiologySaliva Analysis
Which of the following can distinguish between human salivary amylase and human pancreatic amylase?
💡Correct Answer: Option C (Use of antihuman salivary amylase antibody)
Antihuman salivary amylase antibodies (used in lateral flow tests like RSID-Saliva) specifically target salivary amylase and do not cross-react with pancreatic amylase.
Q246
🧬 BiologyBlood Groups
In the ABO system, what does the B-transferase gene transfer to the O antigen, thereby forming the B antigen?
💡Correct Answer: Option D (Galactose)
The B gene encodes a transferase enzyme that adds D-galactose to the H antigen (O antigen precursor), creating the B blood group antigen.
Q247
⚗️ ChemistryNucleic Acids
Consider the following statements:
i. The sugar molecule in RNA is ribose ii. The purine bases in RNA are cytosine and uracil iii. RNA molecule is a single-stranded molecule.
Which of the statements are true?
💡Correct Answer: Option C (i and iii only)
Statements i (ribose sugar) and iii (single-stranded) are true. Statement ii is false because cytosine and uracil are pyrimidine bases, not purines (which are adenine and guanine).
Q248
🧬 BiologyForensic Biology
What solution is used for the temporary mounting of hair sample?
💡Correct Answer: Option A (Glycerin)
Glycerin (or a glycerin-water mixture) is the standard medium used for the temporary mounting and microscopic examination of hair.
Q249
🧬 BiologyBlood Detection
Which of the following is a chemiluminescent assay of blood detection?
💡Correct Answer: Option D (Luminol)
Luminol produces a bright blue chemiluminescence when it reacts with the iron in hemoglobin in the presence of an oxidizer.
Q250
🧬 BiologySaliva Analysis
What cells detected during microscopic examination would indicate the presence of saliva?
💡Correct Answer: Option A (Buccal squamous epithelial cells)
The presence of buccal squamous epithelial cells (shed from the inner lining of the cheek) during microscopic exam points to saliva.
Q251
🧬 BiologyHair Analysis
Which of the following statements aptly define the difference between Human hair and animal hair?
i. The colour in human is relatively uniform throughout the shaft as opposed to that in animal hair ii. The medulla is less than 1/3rd width of the shaft in human hair and greater than 1/3rd width in animal hair iii. Scaling pattern of human hair is imbricate while that of animal hair is varied
💡Correct Answer: Option D (i, ii and iii)
All three statements correctly differentiate human from animal hair: human hair has uniform pigmentation (i), a narrow medulla (index < 0.33) (ii), and consistently imbricate scales (iii).
Q252
🧬 BiologyBlood Groups
What technique is most preferably used for the detection of blood in dried stains?
💡Correct Answer: Option A (Absorption elution)
The absorption-elution method is the most sensitive and preferred technique for detecting ABO blood group antigens in dried bloodstains.
Q253
🔬 Forensic ScienceForensic DNA
Which of the following DNA markers shows maternal inheritance?
💡Correct Answer: Option B (Mitochondrial DNA)
Mitochondrial DNA (mtDNA) is inherited exclusively from the mother because mitochondria are supplied by the egg cell, not the sperm.
Q254
🔬 Forensic ScienceForensic Science
Examination of physical and trace evidences collected from crime scene for the aiding of justice delivery is known as
💡Correct Answer: Option C (Criminalistics)
Criminalistics is the branch of forensic science that deals with the recording, identification, and scientific analysis of physical and trace evidence.
Q255
🔬 Forensic ScienceCrime Scene Management
What does transient evidence mean?
💡Correct Answer: Option B (Evidence which can degrade or disappear within a short period of time)
Transient evidence is evidence that by its very nature is temporary and can easily degrade, disappear, or change over a short period of time (e.g., odors, temperature, footprints in snow).
Q256
🔬 Forensic ScienceForensic Science
In a vehicular collision case, what principle of forensic science would be applicable to collect evidence.
💡Correct Answer: Option C (Law of exchange)
Locard's Exchange Principle (Law of Exchange) states that whenever two objects come into contact, there is a transfer of material (e.g., paint transfer, glass fragments, or tire marks in a vehicular collision).
Q257
🔬 Forensic ScienceForensic Anthropology
What branch of forensic science deals with measurement and proportions of human body?
💡Correct Answer: Option A (Anthropometry)
Anthropometry refers to the systematic measurement of the physical properties and proportions of the human body, popularized by Alphonse Bertillon for criminal identification.
Q258
🔬 Forensic ScienceForensic Botany
Examination of pollen and seeds as trace evidences collected from crime scene is done by
💡Correct Answer: Option B (Forensic Botany)
Forensic Botany involves the application of plant sciences (such as examining pollen grains, seeds, leaves, and wood) to legal investigations.
Q259
🔬 Forensic ScienceForensic Institutions
In what year did the oldest fingerprint bureau, Kolkata celebrate its 125th year of establishment.
💡Correct Answer: Option C (2022)
The first Fingerprint Bureau in the world was established in Calcutta (Kolkata) in June 1897. It celebrated its 125th anniversary in June 2022.
Q260
🔬 Forensic ScienceForensic Institutions
Where was the first chemical examiner's laboratory established in India?
💡Correct Answer: Option A (Madras)
The first Chemical Examiner's Laboratory in India was established at Madras (now Chennai) in 1849.
Q261
🔬 Forensic ScienceForensic Institutions
Where was the foundation of Department of Explosives laid?
💡Correct Answer: Option B (Nagpur)
The Petroleum and Explosives Safety Organization (PESO), formerly known as the Department of Explosives, has its headquarters in Nagpur, Maharashtra, where its foundation was laid in 1898.
Q262
🔬 Forensic ScienceCrime Scene Management
Date, location and scale are the important components of
💡Correct Answer: Option B (Crime scene sketch)
Date, location, and scale (along with direction and legend) are essential components of a Crime Scene Sketch.
Q263
🔬 Forensic ScienceCrime Scene Management
What is not the responsibility of an First Responder?
💡Correct Answer: Option C (Collection of transient evidences at the scene)
The first responder's priority is life safety (first aid), securing the scene, and arresting suspects if present. Collection of transient evidence is typically done by forensic specialists, although they must preserve it.
Q264
🔬 Forensic ScienceCrime Scene Management
What is not a search method employed for outdoor crime scene?
💡Correct Answer: Option D (Supervision method)
Supervision method is not a physical search pattern. Spiral, Grid, Line/Strip, and Zone methods are standard forensic search patterns used for crime scenes.
Q265
🔬 Forensic ScienceCrime Scene Management
The document meant at the crime scene to keep a record of entry and exit of personnels is known as
💡Correct Answer: Option A (Crime Scene Log)
The Crime Scene Security Log (or Crime Scene Log) records the names and times of arrival and departure of all personnel entering or exiting the secured perimeter.
Q266
🔬 Forensic ScienceCrime Scene Management
Any physical location where the crime has occurred is known as
💡Correct Answer: Option C (Crime scene)
A crime scene is defined as any physical location where a crime occurred or where evidence related to the crime is found.
Q267
🔬 Forensic ScienceForensic Science
A forensic scientist becomes an expert by the virtue of
💡Correct Answer: Option D (All of the above)
Under Section 45 of the Indian Evidence Act, a forensic scientist qualifies as an expert through education/knowledge, specialized training, and practical experience/practice.
Q268
⚗️ ChemistryArson Investigation
What type of crime scene does arson signify?
💡Correct Answer: Option A (Unlawful destruction of property or a person by fire)
Arson is the criminal act of deliberately and unlawfully setting fire to property, structures, or wildland areas.
Q269
🔬 Forensic ScienceCrime Scene Management
What is the latest technology of crime scene preservation for reconstruction?
💡Correct Answer: Option C (3-D Laser Scanning)
3-D Laser Scanning (such as FARO scanners) is a state-of-the-art technology that captures a detailed 3D digital model of the entire crime scene for subsequent virtualization and reconstruction.
Q270
🔬 Forensic ScienceCrime Scene Management
Wet seminal stains on an clothing is preserved by
💡Correct Answer: Option C (Air drying and storage in paper bag)
Biological fluids like semen and blood must be air-dried at room temperature away from direct sunlight, and then packaged in a breathable paper bag to prevent bacterial growth.
Q271
⚗️ ChemistryImpression Evidence
Which is not a component of a kit required for lifting footprint from a crime scene?
💡Correct Answer: Option C (FTK card)
FTK (Flinders Technology Key) card is used for collecting and preserving DNA samples, not footprints. Plaster of Paris, tape, and oblique lighting are standard footprint recovery materials.
Q272
⚗️ ChemistryAlternate Light Source
What type of evidence may fluoresce under an alternate light source?
💡Correct Answer: Option B (Semen, blood, saliva)
Semen and saliva contain biological substances (proteins/urea) that fluoresce strongly under UV/alternate light sources. Blood does not fluoresce directly but absorbs light (looks dark/black), but in many standard exam keys, semen, blood, and saliva are listed together as fluid traces detected by ALS.
Q273
🔬 Forensic ScienceCrime Scene Management
A sharp knife collected form the crime scene as evidence should be preserved in
💡Correct Answer: Option B (Wooden box lined with cotton)
Sharp and dangerous items like knives should be secured in a rigid container (such as a wooden or cardboard box) lined with protective cushioning (cotton) to prevent injury and preserve DNA/fingerprints.
Q274
⚛️ PhysicsMicroscopy
Which of the following microscopes can have the maximum resolution
💡Correct Answer: Option C (Scanning Electron Microscope)
A Scanning Electron Microscope (SEM) uses electrons instead of light, yielding resolutions up to 1-5 nm, which is far higher than optical microscopes.
Q275
🔬 Forensic ScienceCrime Scene Management
Scientists going to an mass disaster crime scene should ensure
💡Correct Answer: Option D (All of the above)
Mass disaster management requires self-safety/PPE (biological hazard protection), careful chain of custody (collection/packaging), and surveying the wider area for secondary scenes.
Q276
⚗️ ChemistryLaw of Evidence
What section defines the term "Admissibility"?
💡Correct Answer: Option B (Section-45, India Evidence Act)
Section 45 of the Indian Evidence Act defines the relevancy and admissibility of expert opinions (opinions of experts on foreign law, science, art, identity, handwriting, or finger impressions).
Q277
⚗️ ChemistryLaw of Evidence
What does the term cross-examination mean?
💡Correct Answer: Option B (Examination of witness by the opposite party)
Under Section 137 of the Indian Evidence Act, the examination of a witness by the adverse (opposite) party is called cross-examination.
Q278
⚗️ ChemistryNarcotics
'Affeem' is the common name for what narcotic substance.
💡Correct Answer: Option B (Opium)
'Afeem' (or Afeem) is the common Hindi/Urdu term for Opium, which is derived from the latex of the Papaver somniferum poppy.
Q279
⚗️ ChemistryNarcotics
What is not a phenanthrene alkaloid extracted from Opium plant?
💡Correct Answer: Option C (Narcotine)
Opium alkaloids include phenanthrenes (morphine, codeine, thebaine) and benzylisoquinolines (narcotine/noscapine, papaverine). Thus, Narcotine is not a phenanthrene alkaloid.
Q280
⚗️ ChemistryNarcotics
Cocaine is extracted from plant belonging to family
💡Correct Answer: Option B (Erythroxylum)
Cocaine is extracted from the leaves of the Erythroxylum coca plant (family Erythroxylaceae). Erythroxylum is the genus name representing this botanical source.
Q281
⚗️ ChemistryNarcotics
Which is not true for Morphine?
💡Correct Answer: Option A (Metabolises into 6 MAM on metabolism)
Heroin metabolizes into 6-monoacetylmorphine (6-MAM), and then into morphine. Morphine does not metabolize into 6-MAM; it metabolizes into glucuronides (M3G, M6G).
Q282
⚗️ ChemistryNarcotics
What is an example of synthetic cannabinoid?
💡Correct Answer: Option B (Spice)
Spice (or K2) is a common street name for herbal mixtures sprayed with synthetic cannabinoids.
Q283
⚗️ ChemistryNarcotics
What is the chemical name of ecstasy?
💡Correct Answer: Option B (MDMA)
Ecstasy is the street name for MDMA (3,4-Methylenedioxymethamphetamine), a synthetic psychoactive drug.
Q284
⚗️ ChemistryNarcotics
What controlled substance can be used to synthesize heroin from morphine?
💡Correct Answer: Option A (Acetic anhydride)
Acetic anhydride is a key precursor chemical used to acetylate morphine into heroin (diacetylmorphine). It is highly controlled internationally.
Q285
⚗️ ChemistryNarcotics
What is an example of synthetic drug?
💡Correct Answer: Option A (Barbiturate)
Barbiturates (like phenobarbital) are fully synthetic sedative-hypnotic drugs. Codeine, Cocaine, and Cathinone are natural alkaloids or derived from plants.
Q286
⚗️ ChemistryExplosives
Composition of triple base powders include
💡Correct Answer: Option B (One part Nitrocellulose + One part Nitroglycerine + One part Nitroguanidine)
Triple-base smokeless gunpowders consist of three main energetic materials: nitrocellulose, nitroglycerin, and nitroguanidine.
Q287
⚗️ ChemistryChemical Tests
Griess test with Zinc dust is used for the detection of
💡Correct Answer: Option A (Nitrates)
The Griess reagent directly detects nitrites. Adding Zinc dust reduces nitrates to nitrites, allowing the Griess test to detect Nitrates (such as residues from gunpowder).
Q288
⚗️ ChemistryExplosives
What is the best solvent to extract secondary high explosives?
💡Correct Answer: Option B (Acetone)
Acetone is the most commonly used organic solvent to dissolve and extract secondary high explosives (like RDX, TNT, PETN, and HMX) from post-blast debris.
Q289
⚗️ ChemistryExplosives
What is not the primary component of an high explosive train?
💡Correct Answer: Option A (Safety Switch)
An explosive train consists of a fuse, primer (detonator), booster, and main charge. A safety switch is an electrical or mechanical safety device, not an active chemical/explosive component of the train itself.
Q290
⚗️ ChemistryExplosives
"Booby trap" type of TED is designed to function when
💡Correct Answer: Option B (Victim does something to initiate the initiation mechanism)
A booby trap is an explosive device (IED) designed to be triggered unknowingly by the victim performing a specific, routine action (like opening a door or lifting an object).
Q291
⚗️ ChemistryExplosives
Deflagrating explosives have method of initiation as
💡Correct Answer: Option A (Ignition)
Low/deflagrating explosives (like black powder or smokeless powder) burn rapidly and are initiated by simple ignition or flame, as opposed to high explosives which require a shockwave (detonation) to initiate.
Q292
⚗️ ChemistryExplosives
What are the fundamental features of an explosive?
💡Correct Answer: Option C (Formation of gaseous by-products with simultaneous release of energy)
The absolute defining chemical features of an explosion are the rapid conversion of a solid or liquid into gaseous products with a simultaneous massive release of heat and pressure energy.
Q293
⚗️ ChemistryExplosives
What is the composition of C4 explosive?
💡Correct Answer: Option A (91% RDX, 9% Plastizer)
Composition C4 is a plastic explosive composed of about 91% RDX (explosive) and 9% plasticizer (such as dioctyl sebacate or polyisobutylene binding agent).
Q294
🔬 Forensic ScienceCrime Scene Management
Primary evaluation as done by the First Responder should include
💡Correct Answer: Option D (All of the above)
A first responder's initial assessment (primary evaluation) must establish the size/scope of the incident, identify what emergency services are needed, and evaluate hazard/safety concerns.
Q295
⚗️ ChemistryChemical Tests
Roussin's Test is used to identify' alkaloid of
💡Correct Answer: Option B (Nicotine)
Roussin's crystals test (yielding characteristic crystalline forms under microscopic view) is a microchemical test specifically used to identify nicotine.
Q296
⚗️ ChemistryChemical Tests
Ehrlich reagent used for presumptive detection of LSD contains
💡Correct Answer: Option A (p-dimethylaminobenzaldehyde)
Ehrlich's reagent consists of p-dimethylaminobenzaldehyde (DMAB) in ethanol and hydrochloric acid. It turns purple in the presence of LSD.
Q297
⚗️ ChemistryChemical Tests
What alkaloid shows appearance of golden yellow needle with gold chloride and hydrochloric acid?
💡Correct Answer: Option D (Aconite)
Aconitine (the active alkaloid of Aconitum or Aconite) yields characteristic golden-yellow needles or crystalline rosettes when reacted with gold chloride in hydrochloric acid.
Q298
⚛️ PhysicsSpectroscopy
Morphine in acidic medium shows an max at
💡Correct Answer: Option C (285nm)
Morphine in an acidic aqueous solution (0.1 N HCl) exhibits a characteristic UV absorption maximum (lambda max) at approximately 285 nm (often shifting to ~298 nm in alkaline medium).
Q299
⚗️ ChemistryToxicology
What is an example of stupefying agent used for committing crimes?
💡Correct Answer: Option B (Nitrazepam)
Benzodiazepines like Nitrazepam (or Lorazepam/Diazepam) are common stupefying or sleep-inducing agents slipped into drinks to facilitate crimes (drug-facilitated crimes).
Q300
⚗️ ChemistryToxicology
Urine testing kit for the exposure to drugs is based on principle of
💡Correct Answer: Option B (Immunoassay)
Commercial rapid urine drug test kits utilize lateral flow immunochromatographic assays (Immunoassays) to detect drugs or their metabolites.
Q301
⚗️ ChemistryChemical Tests
Fisher Morris test for Heroin shows what colour in chloroform layer
💡Correct Answer: Option A (Yellow)
The Fisher-Morris test is a color test used to differentiate heroin from morphine. Heroin yields a faint blue color in the aqueous layer and a yellow color in the chloroform layer.
Q302
⚛️ PhysicsChromatography
Dragendorff's Reagent gives what colour in response to alkaloids on TLC
💡Correct Answer: Option A (Orange)
Dragendorff's reagent (potassium bismuth iodide) yields bright orange-red or orange-brown spots when it reacts with alkaloids on a TLC plate.
Q303
⚗️ ChemistryPetroleum Products
What is the common name for petroleum oil?
💡Correct Answer: Option B (Black Gold)
Petroleum (crude oil) is commonly referred to as 'Black Gold' due to its dark appearance when extracted and its high economic value.
Q304
⚗️ ChemistryPetroleum Products
Blue colour in PDS supplied kerosene is due to
💡Correct Answer: Option D (Dialkyl amino anthraquinone)
Public Distribution System (PDS) kerosene in India is dyed blue using a synthetic organic dye, typically dialkylaminoanthraquinone (often known as solvent blue dye).
Q305
⚗️ ChemistryPetroleum Products
What is not the component of a commercial motor gasoline?
💡Correct Answer: Option D (Neoalkanes)
Motor gasoline consists primarily of hydrocarbons belonging to paraffins (alkanes), olefins (alkenes), naphthenes (cycloalkanes), and aromatics. Neoalkanes is not classified as a distinct bulk component group in petroleum fuel analysis.
Q306
⚗️ ChemistryPetroleum Products
Kerosene is composed of carbon chains ranging typically between
💡Correct Answer: Option B (C_10-C_16)
Kerosene is a middle distillate fraction of petroleum, composed of hydrocarbons containing carbon numbers typically between C10 and C16.
Q307
⚗️ ChemistryPetroleum Products
Tetraethyl lead is added to gasoline to serve as
💡Correct Answer: Option B (Anti-knocking agent)
Tetraethyl lead (TEL) was historically added to gasoline as an anti-knocking agent to increase the fuel's octane rating and prevent engine knocking.
Q308
⚗️ ChemistryCoal Chemistry
What type of coal has the lowest content of carbon?
💡Correct Answer: Option D (Lignite)
Lignite (often called brown coal) has the lowest carbon content (about 25-35%), whereas Anthracite has the highest carbon content (86-97%).
Q309
⚗️ ChemistryPetroleum Products
What process is used in industry to separate various components of crude oil?
💡Correct Answer: Option B (Fractional Distillation)
Fractional distillation separates crude oil into fractions of different boiling points, such as petrol, diesel, kerosene, and heavy oils, in a fractionating column.
Q310
⚗️ ChemistryPetroleum Products
Adulteration of motor gasoline with kerosene oil can be detected by
💡Correct Answer: Option C (Gas Liquid Chromatography)
Gas-Liquid Chromatography (GLC) is the gold standard method to analyze fuel profiles and detect adulteration of gasoline with heavier kerosene fractions by resolving hydrocarbon peaks.
Q311
⚗️ ChemistryArson Investigation
Debris collected from the arson crime scene should be collected in
💡Correct Answer: Option C (Metal box with lid)
Arson debris must be collected in an airtight container, such as a clean metal box/can with a tight lid, to prevent volatile accelerant vapors (like gasoline) from escaping.
Q312
⚗️ ChemistryPetroleum Products
Which of the following apparatus can be used to estimate flashpoint?
💡Correct Answer: Option D (All of the above)
All these instruments (Cleveland Open Cup, Abel Apparatus, and Pensky-Martens Closed Cup) are standard laboratory equipment used to determine the flash point of petroleum products.
Q313
⚗️ ChemistryPetroleum Products
What is the lowest temperature at which the volatile liquid will burn and continue to without the help of any external source?
💡Correct Answer: Option B (Fire Point)
The Fire Point is the lowest temperature at which a liquid fuel produces enough vapor to continue burning for at least 5 seconds after ignition by a pilot flame.
Q314
⚗️ ChemistryArson Investigation
What pattern of fire at the point of origin indicates unnatural fire?
💡Correct Answer: Option C (A shape)
An 'inverted V' pattern, which resembles a capital letter 'A' (A shape), often indicates a localized pour of liquid accelerant at the point of origin, characteristic of arson.
Q315
⚗️ ChemistryArson Investigation
What does Class-E fire signify?
💡Correct Answer: Option C (Fire due to electrical short circuit)
In standard classification systems, Class E fire represents fires involving energized electrical equipment or short circuits.
Q316
⚗️ ChemistryCarbohydrate Chemistry
alpha-D(+)-glucose and beta-D(+)-glucose are
💡Correct Answer: Option D (Anomers)
alpha-D-glucose and beta-D-glucose are cyclic monosaccharides that differ in configuration only at the hemiacetal carbon (C-1), making them anomers.
Q317
⚗️ ChemistryCarbohydrate Chemistry
Glucose molecule react with X number of molecules of phenyl hydrazine to yield osazone. The value of X is
💡Correct Answer: Option A (Three)
One molecule of glucose reacts with exactly 3 molecules of phenylhydrazine to form glucose phenylosazone (osazone), aniline, and ammonia.
Q318
⚗️ ChemistryAmino Acids
The main principle behind Ninhydrin test is:
💡Correct Answer: Option A (Redox reaction)
The Ninhydrin test is a redox reaction where amino acids are oxidatively deaminated by ninhydrin (which is reduced to hydrindantin), forming a purple Ruhemann's complex.
Q319
⚗️ ChemistryLipid Chemistry
The greater the unsaturation of oil or a fat ______ is the iodine value.
💡Correct Answer: Option B (Greater)
The iodine value measures the degree of unsaturation in a fat or oil; more double bonds react with more iodine, resulting in a greater iodine value.
Q320
⚗️ ChemistryToxicology Extraction
Modified Stass-Otto Method is used for the isolation of
💡Correct Answer: Option C (Non Volatile Poison)
The Stas-Otto process (and its modifications) is the standard forensic method used to extract non-volatile organic poisons (like alkaloids, barbiturates, and other drugs) from visceral tissues.
Q321
⚗️ ChemistryToxicology
Remote-Local Toxicity is developed by
💡Correct Answer: Option B (Phenol)
Phenol acts locally as a corrosive (causing burns/necrosis) and also remotely on the CNS and kidneys after absorption, demonstrating both local and remote toxicity.
Q322
🧬 BiologyCell Biology
What do you mean by Phagocytosis?
💡Correct Answer: Option C (Absorption phenomenon)
Phagocytosis is a cellular absorption/ingestion phenomenon where a cell engulfs solid particles or pathogens.
Q323
⚗️ ChemistryAntidotes
Antidote for Morphine or Opioid overdose in emergency?
💡Correct Answer: Option A (Naloxone)
Naloxone is a rapid-acting opioid antagonist used to reverse life-threatening respiratory depression in acute opioid/morphine overdose.
Q324
⚗️ ChemistryAntidotes
Universal antidote is Activated Charcoal: Milk of Magnesia: Tannic Acid in the Ratio of?
💡Correct Answer: Option B (2:1:1)
The classical Universal Antidote consists of a mixture of 2 parts Activated Charcoal, 1 part Milk of Magnesia, and 1 part Tannic Acid (Ratio 2:1:1).
Q325
⚗️ ChemistryChemical Tests
In Qualitative analysis, high level of ______ give an orange or red colour in desferrioxamine colour test (QDCT) method
💡Correct Answer: Option D (Iron)
Desferrioxamine (Deferoxamine) is an iron-chelating agent. The qualitative desferrioxamine color test (QDCT) yields an orange-red color when reacted with high concentrations of Iron.
Q326
⚗️ ChemistryFood Toxicology
Infant Botulism is mostly caused by Contaminated:
💡Correct Answer: Option C (Honey)
Infant botulism occurs when an infant ingests spores of Clostridium botulinum, which are commonly found in contaminated raw honey. Hence honey is forbidden for infants under 1 year.
Q327
⚗️ ChemistryAntidotes
Activated charcoal will bind all of the following EXCEPT:
💡Correct Answer: Option D (Potassium)
Activated charcoal does not effectively bind inorganic ions/electrolytes (like potassium, sodium, lithium), strong acids, bases, or alcohols.
Q328
⚗️ ChemistryClinical Toxicology
The most useful bedside test to suggest snake bite envenomation is
💡Correct Answer: Option B (20 min whole blood clotting time)
The 20-minute Whole Blood Clotting Time (20WBCT) is a simple, highly reliable bedside test used to diagnose coagulopathy following viper/snake envenomation.
Q329
⚗️ ChemistryToxicology
______ is combined effect of two chemicals is greater than sum of effects of each.
💡Correct Answer: Option B (Synergism)
Synergism occurs when the joint effect of two active agents is significantly greater than the sum of their individual effects (e.g., 2 + 2 = 10).
Q330
⚗️ ChemistryMedical Jurisprudence
Apoplexy is the term used for
💡Correct Answer: Option B (Cerebral congestion)
Historically in forensic MCQ banks, apoplexy refers to cerebral congestion or hemorrhage causing sudden loss of consciousness.
Q331
⚗️ ChemistryToxicology Extraction
Which of the following poisons can be detected in the viscera in a decomposed body?
💡Correct Answer: Option D (Phosphorous)
Yellow phosphorus and metallic/elemental poisons can resist putrefaction and be detected in the viscera of highly decomposed bodies (organophosphates degrade quickly).
Q332
⚗️ ChemistryAntidotes
N-acetyl penicillamine is used in the treatment of poisoning by
💡Correct Answer: Option A (Mercury)
N-acetyl-DL-penicillamine is a chelating agent used specifically as an antidote in mercury poisoning.
Q333
⚗️ ChemistryToxicology
The half-life of cocaine is approximately:
💡Correct Answer: Option A (1h)
Cocaine has a relatively short elimination half-life of approximately 0.7 to 1.5 hours (usually summarized as ~1 hour).
Q334
⚗️ ChemistryToxicology
Inebriant Poison includes
💡Correct Answer: Option B (Ethanol)
Inebriants are intoxicants that cause drunkenness. Ethanol (alcohol) is the classic example of an inebriant poison.
Q335
⚗️ ChemistryToxicology
Smell of bitter almonds is seen in poisoning with
💡Correct Answer: Option B (Hydrocyanic acid)
Hydrocyanic acid (cyanide) poisoning is classically recognized by a characteristic smell of bitter almonds from the breath or tissues.
Q336
⚗️ ChemistryToxicology Preservation
No preservative need to be added to any of the specimens collected for chemical analysis that can be dispatched to the laboratory immediately and analysis can be done within
💡Correct Answer: Option A (24 hours)
If the biological viscera samples can reach the forensic lab and be analyzed within 24 hours, no chemical preservatives are strictly required, provided cold chain is maintained.
Q337
⚗️ ChemistryToxicology
One of the differences between morphine and pethidine relates to:
💡Correct Answer: Option C (Ability to suppress cough)
Pethidine (meperidine) lacks significant antitussive (cough-suppressing) activity, unlike morphine which is a potent cough suppressant.
Q338
⚗️ ChemistryToxicology ADME
Among following which is not a part of L-ADME?
💡Correct Answer: Option C (Liberty)
L-ADME stands for Liberation, Absorption, Distribution, Metabolism, and Excretion. 'Liberty' is not a component of this pharmacological abbreviation.
Q339
⚗️ ChemistryToxicology ADME
The most important factor that determines whether a substance will be well absorbed within the stomach is the:
💡Correct Answer: Option C (pH)
The acidic pH of the stomach determines the ionization state of a drug. Weak acids (non-ionized at low pH) are well-absorbed from the stomach, making pH the key factor.
Q340
⚗️ ChemistryToxicology ADME
The "first pass" phenomenon pertains to:
💡Correct Answer: Option C (An anatomical arrangement in which xenobiotics absorbed from the intestine go to the liver first rather than into the systemic circulation)
First-pass metabolism refers to the drug metabolism where substances absorbed from the GI tract travel via the portal vein directly to the liver first, before reaching systemic circulation.
Q341
⚗️ ChemistryToxicology ADME
The organ that has greatest ability to bio transform the Xenobiotic is?
💡Correct Answer: Option D (Liver)
The liver is the primary organ for drug metabolism/biotransformation due to its high concentration of cytochrome P450 and other metabolic enzymes.
Q342
⚗️ ChemistryToxicology ADME
Phase I Reactions are correct: Except
💡Correct Answer: Option A (Oxidation and Conjugation)
Phase I drug metabolism reactions include oxidation, reduction, and hydrolysis. Conjugation is a Phase II reaction, not Phase I.
Q343
⚗️ ChemistryOrganometallic Chemistry
In linear nitrosyl NO acts as a/an:
💡Correct Answer: Option C (Three electron donor)
In inorganic complexes, a linear M-N-O system is formalistically treated as coordination of a NO+ ligand, which acts as a 3-electron donor to the metal.
Q344
⚗️ ChemistryOrganometallic Chemistry
The order of CO bond strength in the following metal hexacarbonyls is likely to be:
💡Correct Answer: Option A (V(CO)_6^- < Cr(CO)_6 < Mn(CO)_6^+)
CO bond strength is determined by metal-to-ligand backbonding. More negative charge on the metal increases pi-backdonation, weakening the C-O bond. Thus, V(CO)6^- has the weakest C-O bond, and Mn(CO)6^+ has the strongest C-O bond.
Q345
⚗️ ChemistryOrganometallic Chemistry
Predict the number of Fe-Fe bonds in [(eta^5-C_5H_5)Fe(CO)]_2 molecules using the 18 electron rule:
💡Correct Answer: Option A (One)
The formula represents the cyclopentadienyl iron dicarbonyl dimer [CpFe(CO)2]2 (with a typo in the exam paper missing the 2 after CO). Under the 18-electron rule, each Fe atom contributes 8e^-, Cp contributes 5e^-, two CO ligands contribute 4e^-, totaling 17e^-. To satisfy the 18-electron rule, there must be exactly 1 Fe-Fe single bond.
Q346
⚛️ PhysicsLasers
Laser is a type of light source which has the unique characteristics of
💡Correct Answer: Option D (All A, B and C)
Laser light possesses high monochromaticity (single wavelength), directionality (narrow beam), and coherence/penetration power.
Q347
⚛️ PhysicsPhotochemistry
Photochemical process includes
💡Correct Answer: Option D (All A, B and C)
All listed processes are photochemical (driven by light absorption): photosynthesis in plants, vitamin D synthesis in skin, and photo-degradation of plastic polymers.
Q348
⚗️ ChemistryAnalytical Extractions
Solvent extraction is a ______ analytical technique
💡Correct Answer: Option D (All A, B and C)
Solvent extraction is primarily a separation technique, but it is extensively utilized in qualitative identification and quantitative analysis (hence 'All A, B and C' is selected in standard chemistry answer keys).
Q349
⚗️ ChemistryAnalytical Extractions
Reversed phase SPE separates analytes based on their
💡Correct Answer: Option C (Polarity)
Reversed-phase Solid Phase Extraction (SPE) utilizes a non-polar stationary phase and a polar mobile phase, separating analytes based on differences in their polarities.
Q350
⚗️ ChemistryAnalytical Extractions
______ technique involves the use of a fiber coated with an extracting phase, that can be a liquid (polymer) or a solid (sorbent)
💡Correct Answer: Option B (Solid phase micro extraction)
Solid-Phase Microextraction (SPME) uses a fine fiber coated with a polymer extraction phase to adsorb volatile and semi-volatile analytes directly from headspaces.
Q351
⚗️ ChemistryAnalytical Extractions
Accelerated Solvent extraction is useful for EXCEPT
💡Correct Answer: Option A (Metals)
Accelerated Solvent Extraction (ASE) is a high-temperature, high-pressure organic extraction method suited for organic compounds (pesticides, plasticizers, biodiesel) but is not used for extracting inorganic metals.
Q352
⚗️ ChemistryAnalytical Extractions
______ is based on the working principle of acoustic cavitation
💡Correct Answer: Option A (Ultrasonic extraction)
Ultrasonic-assisted extraction (UAE) utilizes high-frequency sound waves to create microbubbles in the solvent. The implosion of these bubbles (acoustic cavitation) ruptures cell walls to release target analytes.
Q353
⚗️ ChemistryAmino Acids
Example for Zwitterions is
💡Correct Answer: Option C (Glycine)
Glycine is an amino acid that exists as a zwitterion (containing both a positive ammonium charge and a negative carboxylate charge) at neutral pH.
Q354
⚛️ PhysicsChromatography
Efficiency of column separation is
💡Correct Answer: Option B (Indirectly proportional to HETP)
The efficiency of a chromatographic column (number of theoretical plates N) is inversely proportional to the Height Equivalent to a Theoretical Plate (HETP): N = L / HETP. Thus, smaller HETP means higher efficiency.
Q355
⚛️ PhysicsChromatography
When the velocity of the mobile phase is increased the transverse and longitudinal mobile diffusion?
💡Correct Answer: Option A (Decreases)
According to the Van Deemter equation, longitudinal diffusion (B-term, which is B/u) decreases as the mobile phase velocity (u) increases, because the analyte spends less time diffusing along the column.
Q356
⚛️ PhysicsChromatography
Paper chromatography is an example of
💡Correct Answer: Option D (Partition chromatography)
Paper chromatography is primarily partition chromatography, where the stationary phase is water molecules bound within the cellulose paper fibers, and the mobile phase is a solvent.
Q357
⚛️ PhysicsChromatography
In quantitative TLC radioactive material can be studied by
💡Correct Answer: Option D (Geiger counter)
Radioactive zones on thin-layer chromatography (TLC) plates are detected and measured quantitatively using a Geiger counter or a radio-chromatogram scanner.
Q358
⚛️ PhysicsChromatography
The purpose of the sample introduction system in GC is
💡Correct Answer: Option D (All of the above)
The inlet/injection system of a Gas Chromatograph introduces/injects the liquid sample (A), instantly vaporizes it (B), and mixes the vapor with the carrier gas stream (C).
Q359
⚛️ PhysicsChromatography
Which of the following is the disadvantage of nitrogen, which can be used as carrier gas in gas chromatography?
💡Correct Answer: Option C (Reduced Sensitivity)
Nitrogen acts as a heavier carrier gas compared to Helium or Hydrogen, leading to reduced sensitivity or slower analysis speed in mass spectrometers and specific GC detectors.
Q360
⚛️ PhysicsChromatography
What is the full form for the ODS column used in HPLC?
💡Correct Answer: Option B (Octa Decyl Silane)
The ODS column in HPLC stands for Octadecyl Silane (C18), which is the most widely used stationary phase for reversed-phase chromatography.
Q361
⚗️ ChemistryNon Aqueous Solvents
Acetic acid in liquid ammonia behaves as
💡Correct Answer: Option B (Stronger acid than that in water)
Liquid ammonia is a basic solvent. It exerts a levelling effect on acids, making even weak acids like acetic acid behave as strong acids (fully deprotonated) compared to water.
Q362
⚗️ ChemistryChemical Bonding
Which of the following species has the highest electronegativity?
💡Correct Answer: Option C (N (sp hybridized))
Electronegativity increases with increasing s-character of the hybrid orbital. Nitrogen is naturally more electronegative than Carbon, and sp-hybridized Nitrogen (50% s-character) has the highest electronegativity among the choices.
Q363
⚗️ ChemistryInorganic Chemistry
The reaction of BCl_3 with NH_4Cl gives product A which upon reduction by NaBH_4 gives product B. Product B upon reacting with HCl affords compound C, which is
💡Correct Answer: Option A (Cl_3B_3N_3H_9)
The reaction of BCl3 with NH4Cl yields trichloroborazine [ClBNH]3 (Product A). Reduction with NaBH4 gives borazine B3N3H6 (Product B). Borazine reacts with HCl in an addition reaction across the polar B-N bonds to yield B-trichloroborazine trihydrochloride Cl3B3N3H9 (Compound C).
Q364
🛡️ Cyber ForensicsWeb Security
Which of the following explains the nature of Cookies?
💡Correct Answer: Option D (Transient)
In standard computer network contexts, cookies are described as transient (temporary) because session cookies expire when the browser is closed, and even persistent cookies have a set expiration time.
Q365
🛡️ Cyber ForensicsWeb Security
Which of the following is a Boolean cookie attribute?
💡Correct Answer: Option B (Secure)
'Secure' is a Boolean attribute (flag) for cookies. When set, it restricts the transmission of the cookie to secure (HTTPS) connections only.
Q366
🛡️ Cyber ForensicsNetworking
Abbreviation of DNS is
💡Correct Answer: Option D (Domain Name System)
DNS stands for Domain Name System, which translates human-readable domain names (like example.com) into machine-readable IP addresses.
Q367
🛡️ Cyber ForensicsSubnetting
The subnet mask for a particular network is 255.255.31.0. Which of the following pairs of IP addresses could belong to this network?
💡Correct Answer: Option C (128.8.129.43 & 128.8.161.55)
With subnet mask 255.255.31.0, bitwise ANDing of 129 (10000001) and 31 (00011111) gives 1, and 161 (10100001) and 31 gives 1. Thus, both 128.8.129.43 and 128.8.161.55 share the same subnet prefix (128.8.1.0).
Q368
🛡️ Cyber ForensicsSubnetting
A subnet has been assigned a subnet mask of 255.255.255.192. What is the maximum number of hosts that can belong to this subnet?
💡Correct Answer: Option C (62)
The subnet mask 255.255.255.192 leaves 6 bits for the host ID (32 - 26 = 6 bits). The maximum number of assignable hosts is 2^6 - 2 = 62 (excluding network and broadcast addresses).
Q369
🛡️ Cyber ForensicsNetworking Devices
Which of the following is NOT true with respect to a transparent bridge and a router?
💡Correct Answer: Option B (A bridge uses IP addresses while a router uses MAC addresses)
The statement in Option B is reversed: a bridge works at Layer 2 and uses MAC addresses, whereas a router works at Layer 3 and uses IP addresses. Therefore, Option B is NOT true.
Q370
🛡️ Cyber ForensicsWireless Networks
Which media access control protocol is used by IEEE 802.11 wireless LAN?
💡Correct Answer: Option B (CSMA/CA)
IEEE 802.11 wireless LANs use Carrier Sense Multiple Access with Collision Avoidance (CSMA/CA) to manage medium access and avoid collisions on the wireless medium.
Q371
🛡️ Cyber ForensicsIP Addressing
The length of address in IPv6 is
💡Correct Answer: Option B (128 bits)
An IPv6 address has a length of 128 bits, providing a vastly larger address space compared to the 32-bit address space of IPv4.
Q372
🛡️ Cyber ForensicsVPN Protocols
Which of the following is not a VPN protocol?
💡Correct Answer: Option C (SLIP)
SLIP (Serial Line Internet Protocol) is an older encapsulation protocol for serial ports, not a Virtual Private Network (VPN) protocol. PPTP, L2F, and IPSec are VPN tunneling protocols.
Q373
🛡️ Cyber ForensicsCryptographic Protocols
Typically, _____ can receive application data from any application layer protocol, but the protocol is normally HTTP.
💡Correct Answer: Option C (Both A & B)
Both SSL (Secure Sockets Layer) and TLS (Transport Layer Security) reside at the transport/session layer and can secure any application-layer protocol, although HTTP is the most common use case (resulting in HTTPS).
Q374
🛡️ Cyber ForensicsEmail Security
One security protocol for the e-mail system is
💡Correct Answer: Option D (PGP)
PGP (Pretty Good Privacy) is an email encryption protocol that provides cryptographic privacy and authentication. SSL/TLS are general transport protocols, and IPSec operates at the network layer.
Q375
🛡️ Cyber ForensicsCryptography
In an RSA system, if the user chooses both prime number as p=59, q=61, then what is the value of n?
💡Correct Answer: Option A (3599)
In the RSA cryptosystem, the modulus n is the product of the two prime numbers: n = p q = 59 61 = 3599.
Q376
🛡️ Cyber ForensicsCryptography
In RSA, phi(n) = _____ in terms of p and q.
💡Correct Answer: Option C ((p-1)*(q-1))
In RSA, Euler's totient function phi(n) represents the number of positive integers up to n that are relatively prime to n, and is computed as phi(n) = (p - 1) * (q - 1).
Q377
🛡️ Cyber ForensicsCryptography
What is data encryption standard (DES)?
💡Correct Answer: Option A (Block cipher)
DES (Data Encryption Standard) is a symmetric block cipher that processes plaintext data in fixed-size blocks of 64 bits.
Q378
🛡️ Cyber ForensicsCryptography
In asymmetric key cryptography, the private key is kept by
💡Correct Answer: Option B (Receiver)
In asymmetric (public key) cryptography, the public key is shared widely, while the corresponding private key must be kept secret exclusively by the receiver to decrypt messages.
Q379
🛡️ Cyber ForensicsNetworking
PDU stands for
💡Correct Answer: Option D (Protocol data unit)
PDU stands for Protocol Data Unit, which represents a single unit of information transmitted among peer entities of a computer network (e.g. segments in TCP, packets in IP, frames in Ethernet).
Q380
🛡️ Cyber ForensicsCryptographic Protocols
SSL provides
💡Correct Answer: Option D (All the above)
SSL (Secure Sockets Layer) provides confidentiality (via symmetric encryption), integrity (via Message Authentication Codes/HMAC), and also supports data compression.
Q381
🛡️ Cyber ForensicsVirtualization
VMWare Workstation is
💡Correct Answer: Option D (Virtualization Application)
VMWare Workstation is a Type-2 hypervisor, which runs as a virtualization software application on top of a host operating system.
Q382
🛡️ Cyber ForensicsVirtualization
Which of the following is another name for a system virtual machine?
💡Correct Answer: Option A (Hardware Virtual Machine)
A system virtual machine simulates a complete hardware platform to execute an entire guest operating system. Hence, it is also called a Hardware Virtual Machine.
Q383
🛡️ Cyber ForensicsInformation Security
Message _____ means that the data must arrive at the receiver exactly as sent.
💡Correct Answer: Option B (Integrity)
Message integrity ensures that the transmitted data remains unaltered, accurate, and complete during transit from the sender to the receiver.
Q384
🛡️ Cyber ForensicsIP Addressing
Convert the given binary notation IP address to dotted-decimal notation: 10000000 00001011 00000011 00011111
💡Correct Answer: Option B (128.11.3.31)
Converting each 8-bit binary octet to decimal: 10000000 = 128, 00001011 = 11, 00000011 = 3, 00011111 = 31. Thus, the address is 128.11.3.31.
Q385
🛡️ Cyber ForensicsCryptography
Blowfish encrypts blocks of plaintext which have size
💡Correct Answer: Option C (64 bits)
Blowfish is a symmetric block cipher designed by Bruce Schneier that encrypts data in fixed-size blocks of 64 bits.
Q386
🛡️ Cyber ForensicsNetworking
Identify the service which is used to translate a domain name to IP address.
💡Correct Answer: Option B (DNS)
DNS (Domain Name System) is the hierarchical and decentralized naming system used to resolve human-readable hostnames into numeric IP addresses.
Q387
🛡️ Cyber ForensicsLinux Commands
Identify the command which is used to create Linux File systems.
💡Correct Answer: Option B (mkfs)
The `mkfs` (make filesystem) command in Linux is used to build a specific filesystem (like ext4) on a partition or storage device.
Q388
🛡️ Cyber ForensicsLinux Operating System
LILO stands for
💡Correct Answer: Option A (Linux loader)
LILO stands for Linux Loader, which was the standard, simple boot loader used for Linux systems before GRUB became popular.
Q389
🛡️ Cyber ForensicsLinux Commands
Which of the following commands is used to display and create files?
💡Correct Answer: Option D (cat)
The `cat` command (short for concatenate) in Unix-like systems is commonly used to display file content, merge files, or create new files using redirection operators (e.g. `cat > file.txt`).
Q390
🛡️ Cyber ForensicsLinux Commands
Which Linux command is used to see all the hidden files?
💡Correct Answer: Option C (ls-a)
In Linux, running `ls -a` (list all) displays all files and directories in the directory, including hidden files (those starting with a dot).
Q391
🛡️ Cyber ForensicsCryptography
ECC stands for _____ in public key cryptography
💡Correct Answer: Option B (Elliptic curve cryptography)
ECC stands for Elliptic Curve Cryptography, an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields, offering smaller keys with equivalent security to RSA.
Q392
🛡️ Cyber ForensicsWeb Servers
Identify among the following which is mainly used to host web site.
💡Correct Answer: Option B (Web server)
A web server is a software and hardware system designed to store, process, and deliver website pages to clients over the HTTP/HTTPS protocols.
Q393
🛡️ Cyber ForensicsWeb Protocols
HTTPS is stand for
💡Correct Answer: Option D (Hypertext Transfer Protocol Secure)
HTTPS stands for Hypertext Transfer Protocol Secure, which is HTTP layered over TLS or SSL to provide encrypted, authenticated network communication.
Q394
📜 HistoryNetwork History
Identify the first network which was based on TCP/IP protocol.
💡Correct Answer: Option A (ARPANET)
ARPANET (Advanced Research Projects Agency Network) adopted the TCP/IP protocol suite on January 1, 1983, becoming the first network to operate on TCP/IP.
Q395
🛡️ Cyber ForensicsIP Addressing
What is the length of the IPv4 address?
💡Correct Answer: Option D (32 bits)
An IPv4 address is composed of 32 bits, typically represented in dotted-decimal format (four 8-bit octets separated by decimals).
Q396
🛡️ Cyber ForensicsNetwork Topologies
The arrangement where all data pass through a central computer is known as
💡Correct Answer: Option D (Star topology)
In a Star topology, all network nodes are connected to a central hub, switch, or computer, through which all data transmissions must pass.
Q397
🛡️ Cyber ForensicsNetwork Protocols
Choose among the following which is a bit-oriented protocol.
💡Correct Answer: Option B (HDLC)
HDLC (High-Level Data Link Control) is a bit-oriented synchronous data link layer protocol. SSL, HTTP, and HTTPS are character/byte-oriented application/transport protocols.
Q398
🛡️ Cyber ForensicsFirewalls
What is a proxy server also known as?
💡Correct Answer: Option D (Application-level gateway)
An application-level gateway (or application proxy) acts as a proxy server to filter incoming/outgoing traffic at the application layer of the OSI model.
Q399
🛡️ Cyber ForensicsRouting Protocols
What is routing algorithm used by OSPF routing protocol?
💡Correct Answer: Option D (Link state)
OSPF (Open Shortest Path First) is a Link-State routing protocol that uses the link-state routing algorithm (Dijkstra's SPF algorithm) to find the shortest path.
Q400
🛡️ Cyber ForensicsSubnetting
What is the subnetwork address for a host with the IP address 200.10.5.68/28?
💡Correct Answer: Option D (200.10.5.64)
A /28 prefix corresponds to subnet mask 255.255.255.240. Binary bitwise AND of host octet 68 (01000100) and mask 240 (11110000) gives 64 (01000000). Thus, the subnet address is 200.10.5.64.
Q401
🛡️ Cyber ForensicsIP Addressing
To test the IP stack on your local host, which IP address would you ping?
💡Correct Answer: Option D (127.0.0.1)
The IP address 127.0.0.1 is the standard loopback address reserved to test the TCP/IP protocol stack on the local host.
Q402
🛡️ Cyber ForensicsNetworking Organizations
IANA stands for
💡Correct Answer: Option A (Internet Assigned Numbers Authority)
IANA stands for Internet Assigned Numbers Authority, a standard standards body responsible for global coordination of IP addressing, DNS root zone management, and protocol symbols.
Q403
🛡️ Cyber ForensicsFirewalls
Which firewall remembers the information about the previously passed packets?
💡Correct Answer: Option A (Stateful firewalls)
Stateful firewalls monitor and keep track of the state of active network connections (using a state table) to filter incoming and outgoing packets based on connection history.
Q404
🛡️ Cyber ForensicsFirewalls
Network layer firewall works as a
💡Correct Answer: Option B (Packet filter)
A network layer firewall filters traffic based on network packet headers (IP addresses, protocol type, ports), functioning primarily as a packet filter.
Q405
🛡️ Cyber ForensicsFirewalls
The security device which installed between two networks (internal network to outside network) for controlling the flow of traffic into and out of network is known as
💡Correct Answer: Option D (Firewall)
A firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization's previously established security policies.
Q406
🛡️ Cyber ForensicsWireless Networks
The IEEE 802.11 defines basic service set as a building block of wireless
💡Correct Answer: Option A (LAN)
The Basic Service Set (BSS) is the fundamental building block of an IEEE 802.11 wireless Local Area Network (LAN).
Q407
🛡️ Cyber ForensicsIP Addressing
Which one is the natural mask for a class C Network?
💡Correct Answer: Option C (255.255.255.0)
The natural (default) subnet mask for Class C network ranges is 255.255.255.0 (/24 prefix length).
Q408
🛡️ Cyber ForensicsNetworking Devices
If the systems use different protocols, which one of the following devices is used to link two systems?
💡Correct Answer: Option A (Gateway)
A Gateway is a network device used to connect two systems that use different protocols, performing translation/conversion between them at all layers of the OSI model.
Q409
🛡️ Cyber ForensicsNetwork Protocols
What is the standard form of SNMP?
💡Correct Answer: Option B (Simple Network Management Protocol)
SNMP stands for Simple Network Management Protocol, a standard Internet protocol used to collect, organize, and manage information from managed devices on IP networks.
Q410
🛡️ Cyber ForensicsDigital Forensics Principles
Provenance in digital forensics is
💡Correct Answer: Option C (The origin of the evidence)
Provenance in digital forensics refers to the origin, source, history, or custody chain of digital evidence to verify its authenticity and trace its history.
Q411
🛡️ Cyber ForensicsNetwork Topologies
Number of cables required connect 'n' device using Mesh Topology is
💡Correct Answer: Option A (n(n-1)/2)
In a fully connected mesh topology containing n devices, each device connects to n-1 other devices. The total number of simplex/physical links is n * (n - 1) / 2.
Q412
🛡️ Cyber ForensicsIP Addressing
Which of the following is a necessary part of the IPv6 datagram?
💡Correct Answer: Option A (Base header)
The base header is a mandatory, fixed-size 40-byte header that must be present in every IPv6 datagram, whereas extension headers are optional.
Q413
🛡️ Cyber ForensicsNetwork Services
FTP uses port number _____ for control connection.
💡Correct Answer: Option B (21)
FTP (File Transfer Protocol) uses TCP port 21 to establish and manage control connections (sending commands), while port 20 is used for data transfer.
Q414
🛡️ Cyber ForensicsOperating Systems
Which of the following is not an operating system?
💡Correct Answer: Option D (Oracle)
Oracle is a multinational technology corporation known primarily for its Database Management System (DBMS), not an operating system. Linux, DOS, and Windows are OS.
Q415
🛡️ Cyber ForensicsNetworking
How many digits of the Data Network Identification Code (DNIC) identify the country?
💡Correct Answer: Option D (First three digits)
A DNIC is a 4-digit number. The first three digits represent the Country Code (Data Country Code - DCC), and the fourth digit specifies the data network within that country.
Q416
🛡️ Cyber ForensicsCyber Attacks
Which of the below is a popular victim of cyber attackers looking to gain the IP address of a target or victim user?
💡Correct Answer: Option B (Websites)
Websites are common tools used by attackers to log visitor connections. By redirecting victims to a specific web server, attackers can easily capture and inspect the victim's source IP address in server access logs.
Q417
🛡️ Cyber ForensicsNetwork Services
What is a single entrance for multiple connectivity's called?
💡Correct Answer: Option C (Directory service)
A directory service (like Active Directory) is a single, centralized database system that acts as a single point of entry to manage and connect multiple network services and users.
Q418
🛡️ Cyber ForensicsCyber Attacks
_____ are piece of programs or scripts that allow hackers to take control over any system.
💡Correct Answer: Option A (Exploits)
Exploits are code, scripts, or programs written by hackers that take advantage of specific software or hardware vulnerabilities to compromise and gain unauthorized control over a target system.
Q419
🛡️ Cyber ForensicsOperating Systems
The operating system keeps a small table containing information about all open files called
💡Correct Answer: Option B (Open-file table)
The OS maintains an open-file table to keep track of all files currently opened by active system processes, caching information like file offset, permissions, and file descriptors.
Q420
🛡️ Cyber ForensicsOperating Systems
Which of the following are the two parts of the file name?
💡Correct Answer: Option C (Extension and name)
In standard computer operating systems, a file name consists of two parts: the base name and the extension, which indicates the file format (separated by a dot).
Q421
🛡️ Cyber ForensicsLaw of Evidence
Photographs, videos, sound recordings, X-rays, maps drawing, graphs charts is a type of
💡Correct Answer: Option A (Illustrative evidence)
Illustrative evidence (or demonstrative evidence) includes items like charts, diagrams, drawings, videos, and photographs used by experts to illustrate and explain their verbal testimonies.
Q422
🔬 Forensic ScienceDigital Evidence
A logon record tells us that, at a specific time:
💡Correct Answer: Option B (The account was used to log into the system)
A digital logon record strictly verifies only that the specific user account credentials were used to authenticate/login. It cannot physically prove who was typing behind the keyboard.
Q423
🔬 Forensic ScienceDigital Evidence
A network sniffer program is an example of.
💡Correct Answer: Option C (Information as an instrumentality)
In legal and digital forensics contexts, a software utility (such as a packet sniffer) used to execute a crime (intercepting password data) is classified as 'Information as an instrumentality' of the crime.
Q424
🛡️ Cyber ForensicsCyber Attacks
In _____ attack, the attacker doesn't actively take ever another user to perform the attack.
💡Correct Answer: Option B (Spoofing)
In a spoofing attack, the attacker simply mimics the identity (e.g. IP spoofing) without taking over or hijacking an active user's existing connection.
Q425
🛡️ Cyber ForensicsCybersecurity Tools
Which of the following is a session hijacking tool?
💡Correct Answer: Option A (T-Sight)
T-Sight is a commercial security and network sniffing utility used for session hijacking and active monitoring. Wireshark is a packet analyzer, Maltego is OSINT, and Nessus is a vulnerability scanner.
Q426
🛡️ Cyber ForensicsIntrusion Detection Systems
What are characteristics of stack-based IDS?
💡Correct Answer: Option D (They are integrated closely with the TCP/IP stack and watch packets)
Stack-based IDSs are integrated directly into the host TCP/IP stack, allowing them to watch packets as they are processed through the network layer stack.
Q427
🛡️ Cyber ForensicsCloud Computing
Which of the following is not a type of cloud server?
💡Correct Answer: Option D (Merged Cloud Servers)
Cloud servers include dedicated, public, and private cloud deployment architectures. 'Merged' cloud server is not a recognized type.
Q428
🛡️ Cyber ForensicsCloud Computing
Which of the following is the most refined and restrictive cloud service model?
💡Correct Answer: Option C (SaaS)
SaaS (Software as a Service) is the most refined and restrictive model for users because the provider manages all infrastructure, platforms, and software configuration, leaving users with only software application access.
Q429
🛡️ Cyber ForensicsCloud Security
Which of the following is the standard for interoperable cloud-based key management?
💡Correct Answer: Option A (KMIP)
KMIP (Key Management Interoperability Protocol) is a standard developed by OASIS to ensure interoperability between key management servers and clients.
Q430
🛡️ Cyber ForensicsCloud Computing
Which of the following is an essential concept related to Cloud?
💡Correct Answer: Option B (Abstraction)
Abstraction and Virtualization are the two core concepts of cloud computing. Physical resources are abstracted away from users via virtualization.
Q431
🛡️ Cyber ForensicsSQL Injection
Which of the stored procedure is used to test the SQL injection attack?
💡Correct Answer: Option B (xp_regwrite)
`xp_regwrite` is an extended stored procedure in MS SQL Server that writes values to the registry. Attackers try to invoke it to verify if they can overwrite registry values through SQL injection.
Q432
🛡️ Cyber ForensicsSQL Injection
_____ is time-based SQL injection attack.
💡Correct Answer: Option C (Blind SQL Injection)
Time-based SQL injection is a subtype of Blind SQL Injection. It forces the database to pause/wait for a specific time before responding, letting attackers infer database structure.
Q433
🛡️ Cyber ForensicsSQL Injection
Which will be useful to detect SQL Injection attacks?
💡Correct Answer: Option C (Intrusion Detection System)
An Intrusion Detection System (IDS) inspects incoming network payloads against known attack signatures to detect malicious activities, including SQL Injection attacks.
Q434
🛡️ Cyber ForensicsSQL Injection
Which of the following statement is TRUE about SQL Injection?
💡Correct Answer: Option C (SQL Injection is a Code Penetration Technique)
SQL Injection is a code injection technique used to penetrate applications by executing arbitrary SQL commands through user inputs.
Q435
🛡️ Cyber ForensicsNetwork Forensics
The process of collection of network device logs is known as
💡Correct Answer: Option C (Active acquisition)
In network forensics, collecting data and logs directly from running network devices (routers, switches, firewalls) is known as Active Acquisition.
Q436
🛡️ Cyber ForensicsNetworking
ATM uses
💡Correct Answer: Option B (Asynchronous time division multiplexing)
Asynchronous Transfer Mode (ATM) uses Asynchronous Time Division Multiplexing (ATDM) to multiplex cell streams over physical links.
Q437
🛡️ Cyber ForensicsNetworking
An ATM switch at the boundary of the network usually uses _____ for routing.
💡Correct Answer: Option B (VPIs & VCIs)
At the UNI boundary of an ATM network, switches translate and route cells using both Virtual Path Identifiers (VPIs) and Virtual Channel Identifiers (VCIs) to map connections.
Q438
🛡️ Cyber ForensicsWireless Networks
Which modulations scheme is used by Bluetooth technology?
💡Correct Answer: Option C (GFSK)
Bluetooth Basic Rate (BR) technology uses GFSK (Gaussian Frequency Shift Keying) modulation to transmit data over its 79 RF channels.
Q439
🛡️ Cyber ForensicsWireless Networks
Which one of the following enables us to use the entire bandwidth simultaneously?
💡Correct Answer: Option B (CDMA)
CDMA (Code Division Multiple Access) enables multiple users to utilize the entire allocated frequency bandwidth simultaneously by separating user signals with unique codes.
Q440
🛡️ Cyber ForensicsWireless Networks
Which of the following is not true about TDMA?
💡Correct Answer: Option A (Single carrier frequency for single user)
In TDMA (Time Division Multiple Access), a single carrier frequency is shared among multiple users using distinct time slots, rather than being dedicated to a single user.
Q441
🛡️ Cyber ForensicsWireless Networks
_____ synchronization overhead is required in TDMA due to _____ transmission.
💡Correct Answer: Option A (High, burst)
TDMA requires high synchronization overhead (guard times and sync bits) because transmission occurs in short, discontinuous bursts which must align perfectly in time slots.
Q442
🛡️ Cyber ForensicsMobile Forensics
Which of the following is NOT a category of mobile forensic tools?
💡Correct Answer: Option C (Data encryption tools)
Mobile forensic tools encompass extraction, recovery, and analysis categories. Encryption tools are security mechanisms to protect data, not forensic tools.
Q443
🛡️ Cyber ForensicsSQLite Databases
Which of the following is not a valid data type in SQLite?
💡Correct Answer: Option D (DECIMAL)
SQLite does not have a native DECIMAL storage class. It assigns it NUMERIC affinity. In contrast, TEXT, INTEGER, and FLOAT (mapped to REAL) are standard data types or classes.
Q444
🛡️ Cyber ForensicsSQLite Databases
Which of the following statements is true about SQLite encryption?
💡Correct Answer: Option A (SQLite supports encryption using the SQLite Encryption Extension (SEE))
Standard SQLite does not include encryption by default. It supports it through commercial add-ons like the SQLite Encryption Extension (SEE).
Q445
🛡️ Cyber ForensicsSQLite Databases
Which of the following SQL statements is used to drop a trigger from SQLite?
💡Correct Answer: Option A (DROP TRIGGER)
The standard SQL syntax to delete a trigger in SQLite is: `DROP TRIGGER trigger_name;`.
Q446
🛡️ Cyber ForensicsMobile Security
What is the general length of the IMEI number?
💡Correct Answer: Option D (15 digits)
An IMEI (International Mobile Equipment Identity) number is a unique 15-digit number used to identify 3GPP and iDEN mobile phones.
Q447
🛡️ Cyber ForensicsCyber Crimes
Which among the following characteristics are correct about cyberstalking?
💡Correct Answer: Option A (Use of internet or electronics to stalk or harass individual or any group)
Cyberstalking is specifically defined as the use of the Internet, email, or other electronic communication devices to stalk or harass another person.
Q448
🛡️ Cyber ForensicsCyber Crimes
What are the means used for stalking by a cyber stalker?
💡Correct Answer: Option C (Emails, messages, phone calls air drop etc.)
A cyberstalker uses electronic communication channels like emails, direct messages, social media, phone calls, and filesharing/airdrop to harass victims.
Q449
🛡️ Cyber ForensicsDigital Signatures
Digital Signatures authenticates the sender by appending the original message with the _____ digest.
💡Correct Answer: Option B (Encrypted message)
A digital signature authenticates the sender by signing (encrypting with private key) the message digest, and appending this encrypted digest to the original message.
Q450
🛡️ Cyber ForensicsPrivacy Tools
_____ is a popular tool to block social-media websites to track your browsing activities.
💡Correct Answer: Option B (Blur)
Blur (Abine Blur) is a well-known privacy tool and browser extension designed to block social media trackers, block ads, and mask user details.
Q451
🛡️ Cyber ForensicsSocial Engineering
Part of the social media sites are the various games & third-party applications which helps _____ to get access to your data.
💡Correct Answer: Option D (Cyber-criminals)
Malicious games and third-party apps on social networks are frequently deployed by cyber-criminals to harvest user profile data and spread malware.
Q452
🛡️ Cyber ForensicsInformation Security
Many social media sites and services provide _____ for legitimate account verification.
💡Correct Answer: Option D (2-step verification)
Two-step (or two-factor) verification is standardly provided by social media services to authenticate the identity of the legitimate account holder during logins.
Q453
🛡️ Cyber ForensicsCryptography
In public key cryptosystem which is kept as public?
💡Correct Answer: Option A (Encryption keys)
In a standard public key encryption system (for confidentiality), the encryption key (public key) is published, while the decryption key (private key) is kept secret.
Q454
🛡️ Cyber ForensicsCryptography
AES can decrypt the data in blocks of _____ bits each?
💡Correct Answer: Option A (128)
AES (Advanced Encryption Standard) has a fixed block size of 128 bits for both encryption and decryption, regardless of the key size (which can be 128, 192, or 256 bits).
Q455
🛡️ Cyber ForensicsCryptography
On which of the following term does AES performs computation?
💡Correct Answer: Option A (Bytes)
AES is a byte-oriented cipher; it represents blocks internally as a 4x4 matrix of bytes (called the State) and performs mathematical computations on bytes.
Q456
🏛️ CivicsLegal Amendments
Which section of Reserve Bank of India has been amended after the commencement of information technology act 2000 to include electronic fund transfer services like NEFT, RTGS etc?
💡Correct Answer: Option B (Section 58 (2))
Section 58(2) of the Reserve Bank of India Act, 1934, was amended by the IT Act, 2000, to authorize regulations for electronic fund transfers.
Q457
🔬 Forensic ScienceForensic Principles
Consider the following principles of forensic science: i. Not all contact leaves a trace ii. Two different things can be compared iii. Everything is unique iv. Change is the only constant Which of the above statements is true/correct?
💡Correct Answer: Option B (iii and iv only)
According to the fundamental laws of forensic science, the Law of Individuality states 'Everything is unique' (iii), and the Law of Progressive Change states 'Change is the only constant' (iv). Statement i is incorrect because Locard's Exchange Principle states 'Every contact leaves a trace'. Statement ii is incorrect because the Law of Comparison states that only likes can be compared.
Q458
🔬 Forensic ScienceHistory of Forensics
Consider the following pairs: i. Father of forensic toxicology - Albert Osborn ii. Father of Forensic Ballistics - Calvin Goddard iii. Father of fingerprints - Francis Galton iv. Father of questioned documents - Mathieu Orfila Which of the scientists are correctly matched with their domain?
💡Correct Answer: Option B (ii and iii only)
Calvin Goddard is widely known as the Father of Forensic Ballistics (ii). Francis Galton is recognized as the Father of Fingerprints (iii) for developing the first classification system. Mathieu Orfila is the Father of Forensic Toxicology (not questioned documents), and Albert Osborn is the Father of Questioned Documents (not toxicology).
Q459
🔬 Forensic ScienceHistory of Forensics
Where was the first chemical examiner laboratory set up in India?
💡Correct Answer: Option D (Madras)
The first Chemical Examiner's Laboratory in India was established at Madras (now Chennai) in the year 1849.
Q460
🔬 Forensic ScienceHistory of Forensics
The first Central Forensic Science Laboratory was started in Calcutta in which of the following year?
💡Correct Answer: Option A (1957)
The first Central Forensic Science Laboratory (CFSL) of India was established in Calcutta (Kolkata) in 1957.
Q461
🔬 Forensic ScienceForensic Physics
Examination of tire marks is carried out in which of the following divisions of forensic science laboratory?
💡Correct Answer: Option C (Physics division)
Physical evidence such as tire marks, tool marks, glass fractures, soil, and fiber comparisons are typically analyzed in the Physics Division of a forensic science laboratory.
Q462
🧬 BiologyBiometrics
Automated Multi-modal Biometric Identification System (AMBIS) has which of the following biometrics?
💡Correct Answer: Option A (Fingerprints, palmprints and iris)
The Automated Multi-modal Biometric Identification System (AMBIS) integrates multiple biometric identifiers, including fingerprints, palmprints, face/iris scans, to assist law enforcement agencies in identifying suspects.
Q463
🔬 Forensic ScienceForensic Medicine
What does the term "Compos mentis" while giving a testimony or dying declaration mean?
💡Correct Answer: Option A (Being of sound mind)
"Compos mentis" is a Latin term meaning 'of sound mind' or having full control of one's mental faculties, which is a key requirement for a valid testimony or dying declaration.
Q464
🔬 Forensic ScienceCrime Scene Management
The following steps are carried out during crime scene processing. i. Collect ii. Process and preserve iii. Record iv. Observe Which is the right order beginning from the first step?
💡Correct Answer: Option D (iv, iii, i, ii)
The standard sequence of crime scene processing is to first Observe (iv) the scene, Record (iii) it through notes, sketches, and photos, Collect (i) the physical evidence, and finally Process and preserve (ii) the evidence and scene details.
Q465
🔬 Forensic ScienceForensic Law
What does Corpus delecti mean?
💡Correct Answer: Option A (Elements of crime)
"Corpus delicti" is a Latin term meaning 'the body of the crime', which refers to the objective proof (elements) that a crime has indeed been committed.
Q466
🧬 BiologyBiometrics
AFIS is an automated system for storing and matching which of the following biometrics?
💡Correct Answer: Option C (Fingerprints)
AFIS stands for Automated Fingerprint Identification System, which is used by forensic investigators to store, search, and match digital fingerprints.
Q467
🧬 BiologyTrace Evidence
Which of the following is an example of trace evidence?
💡Correct Answer: Option C (Fiber)
Trace evidence refers to microscopic physical evidence that is transferred between objects or people during a crime. Examples include hair, fibers, glass fragments, and paint chips.
Q468
🔬 Forensic ScienceForensic Law
What is "Lying under oath" called?
💡Correct Answer: Option D (Perjury)
Perjury is the act of willfully making false statements or lying under oath during a judicial proceeding.
Q469
🧬 BiologyBiometrics
Which of the following is an example of behavioural biometrics?
💡Correct Answer: Option A (Handwriting)
Behavioral biometrics measure patterns of human activities. Handwriting, signature dynamics, keystroke dynamics, and gait are behavioral, while iris, lip prints, and nail beds are physiological biometrics.
Q470
🔬 Forensic ScienceForensic Law
Which of the following standard is related to the admissibility of evidence?
💡Correct Answer: Option D (Frye standard)
The Frye standard ( Frye v. United States, 1923) dictates that scientific evidence is admissible in court only if the scientific technique is 'generally accepted' as reliable within the relevant scientific community.
Q471
⚛️ PhysicsMicroscopy
After reaching the resolution limit of a microscope, it can be continued to magnify an image but not improve its resolution-this is called as:
💡Correct Answer: Option B (Empty magnification)
Empty magnification occurs when an image is enlarged further without revealing any new detail, because the resolution limit of the objective lens has already been reached.
Q472
🧬 BiologyEvidence Classification
Consider the following statements: i. Brand of footwear is a class characteristic ii. DNA profile is an individual characteristic iii. Wear and tear on the sole of the footwear is a class characteristic iv. Blood group is an individual characteristic Which of the above statements is true/correct?
💡Correct Answer: Option A (i and ii only)
The brand of footwear is a class characteristic (applies to a group) (i), and a DNA profile is an individual characteristic (uniquely identifies an individual) (ii). Wear and tear on footwear is an individual characteristic (iii is false), and blood group is a class characteristic (iv is false).
Q473
🔬 Forensic ScienceEvidence Collection
What is an exemplar?
💡Correct Answer: Option A (Item for comparison with the questioned sample from a known source)
An exemplar (or reference sample) is a legally collected specimen of known origin (e.g. handwriting sample or DNA from a suspect) used to compare against the questioned evidence collected from the crime scene.
Q474
🔬 Forensic ScienceCrime Scene Management
Which of the following search methods on the crime scene is a very thorough method for searching for evidence?
💡Correct Answer: Option D (Double strip method)
The double strip search method (also known as the grid search method) involves searching along parallel strips and then repeating the process perpendicular to the first path, making it extremely thorough.
Q475
🔬 Forensic ScienceCrime Scene Sketching
Triangulation is a method used for which of the following purposes?
💡Correct Answer: Option B (Measurement technique used for Sketching crime scene)
Triangulation is a classic measurement technique used in crime scene sketching to record the exact location of evidence relative to two fixed, known reference points.
Q476
🔬 Forensic ScienceCrime Scene Management
Consider the following duties of the first responding officer. i. Barricade the crime scene ii. Compile data from the scene iii. Attend to any injured people/survivors iv. Remove and detain witnesses/suspects from crime scene Arrange the duties in chronological order starting from the first duty
💡Correct Answer: Option A (iii, iv, i, ii)
The first priority of the responding officer is to preserve life by attending to the injured (iii). The next step is to secure the individuals at the scene by detaining witnesses/suspects (iv), followed by securing the physical scene by barricading (i), and finally documenting and compiling initial scene data (ii).
Q477
🧬 BiologyEvidence Packaging
What is a druggist fold?
💡Correct Answer: Option B (Packaging system for trace evidence)
A druggist's fold is a folding technique for paper packaging that creates an enclosed, leak-proof packet. It is widely used in forensic science for collecting trace evidence like hair, fibers, paint chips, or powders.
Q478
🔬 Forensic ScienceCrime Scene Investigation
The trace evidence sometimes fluoresces under Alternate Light Source (ALS) used at the crime scene. What is its range?
💡Correct Answer: Option D (400-800 nm)
Alternate Light Sources (ALS) utilized at crime scenes generally operate within the visible and near-ultraviolet range (typically from 400 nm to 800 nm) to detect biological fluids, fibers, and other trace evidence via fluorescence.
Q479
🧬 BiologyEvidence Packaging
Consider the following statements about the packaging of evidence: i. Biological samples such as bloody cloth have to be packaged in an airtight container while it's wet ii. Samples suspected of containing accelerants from arson scenes should be packaged in airtight metal cans iii. All the evidence collected from the crime scene should be packaged in one common container for ease of transportation iv. Biological samples should be air-dried at room temperature and before packaging in breathable paper bags Which of the above statements are true/correct?
💡Correct Answer: Option C (ii and iv only)
Arson evidence containing volatile accelerants must be stored in airtight metal cans to prevent evaporation (ii). Biological samples (like bloodstains) must be air-dried first and stored in breathable paper bags to prevent mold and bacterial degradation (iv). Packaging wet samples in airtight containers (i) or combining all samples (iii) causes contamination and degradation.
Q480
⚗️ ChemistryArson Investigation
A V-shaped burning pattern on a wall on a fire crime scene may indicate which of the following?
💡Correct Answer: Option C (Origin of fire)
Fire naturally burns upward and outward, creating a V-shaped pattern on vertical surfaces. The bottom point of the 'V' often points directly to the point of origin of the fire.
Q481
🧬 BiologyCriminology
A serial offender is suspected of victimizing young teenage girls by mutilating their breasts. What will be the signature/style by which the culprit is killing his victims be called?
💡Correct Answer: Option A (Modus operandi)
The method of committing a crime is called Modus Operandi (M.O.). While mutilation is a psychological signature, of the choices provided, 'Modus operandi' is the only valid legal/criminological term matching criminal behavioral patterns.
Q482
🧬 BiologyDNA Profiling
Which of the following evidences have the power of individualization?
💡Correct Answer: Option A (DNA)
DNA profiling has the statistical power of individualization, meaning it can uniquely identify a single individual. Blood group, shoe brand, and general whorl patterns of fingerprints are class characteristics (shared by multiple people).
Q483
🔬 Forensic ScienceForensic Ethics
Which of the following is the ethical responsibility of a forensic scientist?
💡Correct Answer: Option A (Maintaining unbiased opinion and confidentiality of the information)
Forensic scientists are ethically bound to maintain absolute objectivity (unbiased scientific analysis) and keep all case information completely confidential.
Q484
🔬 Forensic ScienceCrime Scene Protection
Consider the following statements to follow to avoid contamination of the crime scene. i. Establish multiple routes of entry and exit to the crime scene ii. Wear PPE at all times while on the crime scene iii. Create a separate route for entry to the crime scene for onlookers iv. Use a single-use collection kit for biological samples Which of the above statements is true/correct?
💡Correct Answer: Option B (ii and iv only)
To prevent cross-contamination, investigators must wear Personal Protective Equipment (PPE) at all times (ii) and utilize single-use collection kits for each sample (iv). Only a single point of entry/exit should be established (i is false), and onlookers should never be allowed inside (iii is false).
Q485
🧬 BiologyEvidence Vocabulary
Consider the following pairs:
| Term | Definition | | --- | --- | | i. Elimination sample | Known source from someone who had lawful access to the scene | | ii. Questioned sample | Known source from the crime scene which was presumably uncontaminated during a crime | | iii. Reference sample | Known source with which evidence is compared to establish a link | | iv. Control sample | Recovered from crime whose source is in question |
Which of the above pairs are correctly matched?
💡Correct Answer: Option C (i and iii only)
Pairs i and iii are correctly matched. A questioned sample is of unknown origin (ii is incorrect), and a control sample is a standard material of known origin used to verify assay validity, not a sample whose source is in question (iv is incorrect).
Q486
🔬 Forensic SciencePresumptive Testing
What is a presumptive test?
💡Correct Answer: Option B (It is a non-confirmatory test to screen the presence of a substance)
A presumptive test is a highly sensitive but non-specific screening test. It is used to quickly screen samples and suggest the potential presence of a substance (e.g. blood, semen, drugs), but requires a confirmatory test for confirmation.
Q487
⚗️ ChemistryArson and Explosives
Consider the following guidelines for the collection of evidence on an explosive scene i. Collect samples in airtight glass jars without rubber liners ii. Fill the container with evidence suspected to have accelerant full up to the brim with no space. iii. Use breathable paper bags to collect debris with suspected explosive residue iv. Use an activated charcoal strip placed inside the container to absorb volatile fumes from the sample Which of the above statements is true/correct?
💡Correct Answer: Option A (i and iv only)
Explosive debris and accelerants must be packaged in clean, airtight glass jars or metal cans without rubber liners (i) to prevent organic contamination and evaporation of volatile gases. Activated charcoal strips are placed inside the container to absorb these volatile organic compounds for headspace analysis (iv). Breathable bags (iii) allow gases to escape, and filling to the brim (ii) leaves no headspace for vapor collection.
Q488
🧬 BiologyForensic Serology
On a suspected homicide crime scene, which of the following chemicals is used for the chemiluminescence of blood?
💡Correct Answer: Option C (Luminol)
Luminol (5-amino-2,3-dihydrophthalazine-1,4-dione) is a chemical compound that exhibits chemiluminescence (glows blue) when it reacts with the iron found in hemoglobin.
Q489
🔬 Forensic ScienceCrime Scene Sketching
Which of the following sketches shows a side view for example perspective of a wall looking from the side?
💡Correct Answer: Option C (Elevated view)
An elevated sketch (or elevation view) depicts a vertical plane, showing a side-on view of the scene, such as a wall containing bullet holes or blood spatter patterns.
Q490
🔬 Forensic ScienceCrime Scene Photography
Which of the following is a detailed millimetre scale placed next to evidence while taking close view photograph of evidence?
💡Correct Answer: Option D (ABFO)
The ABFO No. 2 scale, developed by the American Board of Forensic Odontologists, is a standard L-shaped millimetric scale placed next to wounds, bite marks, or other physical evidence during close-up photography to establish accurate scaling.
Q491
🧬 BiologyImpression Evidence
Electrostatic lifting device can be used to collect which of the following evidence from crime scene?
💡Correct Answer: Option A (Dusty footprints on floor)
An Electrostatic Dust Print Lifter (EDPL) applies a high-voltage charge to a metallized plastic sheet, drawing dry dust particles from footwear impressions on floors or carpets onto the film.
Q492
🔬 Forensic ScienceForensic Quality
Which of the following body offers accreditation to forensic science laboratories?
💡Correct Answer: Option B (NABL)
NABL (National Accreditation Board for Testing and Calibration Laboratories) is the primary body in India that provides formal accreditation to testing and calibration laboratories, including forensic laboratories under ISO/IEC 17025.
Q493
🔬 Forensic ScienceForensic Law
Inquiry into the cause of death by Magistrate is covered in which of the following?
💡Correct Answer: Option C (176 CrPC)
Section 176 of the Criminal Procedure Code (CrPC) deals with inquiry by a Magistrate into the cause of death in cases such as custodial deaths, suspicious deaths, or deaths of women within seven years of marriage.
Q494
🔬 Forensic ScienceForensic Ethics
Consider the following ethics of a forensic expert: i. Be subjective in validated scientific analysis ii. Be objective in their analysis iii. Employ validated methods of analysis iv. Give personal opinions on the suspect of the crime Which of the above statements are true/correct?
💡Correct Answer: Option A (ii and iii only)
A forensic expert is ethically required to remain strictly objective (ii) during their analysis and always employ scientifically validated analytical methods (iii). Subjective bias (i) and personal opinions (iv) violate scientific and legal standards.
Q495
🔬 Forensic ScienceForensic Law
Which of the following Acts relates to evidence and its admissibility in the court in India?
💡Correct Answer: Option A (Indian Evidence Act, 1872)
The Indian Evidence Act, 1872, is the primary legislation that governs the admissibility, relevance, and weight of evidence in Indian courts of law.
Q496
🧬 BiologyLocard Principle
When trace evidence is transferred from source "A" to source "C" without contact via intermediate source "B" it is called?
💡Correct Answer: Option C (Secondary transfer)
Secondary transfer occurs when evidence is transferred from source A to B, and then from B to C without direct contact between A and C.
Q497
🔬 Forensic ScienceForensic Medicine
Consider the following statements regarding who can conduct an autopsy in India. i. A trained Magistrate ii. A Registered Medical Practitioner in forensic medicine iii. Coroner iv. A doctor with B.A.M.S degree Which of the above statements are true/correct?
💡Correct Answer: Option B (ii only)
In India, an autopsy (post-mortem examination) can only be performed by a Registered Medical Practitioner (holding a valid MBBS degree or specialization in Forensic Medicine/MD). Magistrates and coroners only conduct inquests/inquiries, and B.A.M.S. doctors (Ayurvedic practitioners) are generally not authorized to perform forensic autopsies.
Q498
🔬 Forensic ScienceForensic Law
Which of the following evidences are NOT accepted in the Indian Legal system or admissible in court?
💡Correct Answer: Option A (Polygraphy)
In the landmark judgment Selvi v. State of Karnataka (2010), the Supreme Court of India ruled that lie-detector tests (polygraphy, narco-analysis, brain mapping) cannot be admitted as evidence unless voluntarily undertaken, and even then, results are generally not substantively admissible. DNA, fingerprints, and autopsy reports are widely accepted.
Q499
⚛️ PhysicsMicroscopy
Michel Levy chart is referred in which of the following microscopy while examining birefringent evidence?
💡Correct Answer: Option C (Polarized light microscope)
The Michel-Lévy interference color chart is used in polarized light microscopy to determine the birefringence of a specimen (like synthetic fibers or minerals) based on thickness and retardation.
Q500
⚛️ PhysicsMicroscopy
The Stereo microscope has a different optical path for each eye to view which gives rise to?
💡Correct Answer: Option B (3-dimensional view of evidence sample)
A stereomicroscope (dissecting microscope) provides two separate optical paths, presenting slightly different angles of the specimen to each eye, which produces a three-dimensional (3D) visual effect.
Q501
⚛️ PhysicsMicroscopy
What is the lens in a compound microscope closest to the specimen called?
💡Correct Answer: Option D (Objective lens)
The lens closest to the specimen in a light or compound microscope is called the objective lens, which gathers light and focuses the image of the specimen.
Q502
⚛️ PhysicsMicroscopy
The UV or blue light is used to focus on evidence sample in which of the following microscopes?
💡Correct Answer: Option A (Fluorescence microscope)
A fluorescence microscope uses high-intensity ultraviolet or blue excitation light to illuminate the specimen, exciting fluorescent dyes or autofluorescent components to emit lower-energy light.
Q503
⚛️ PhysicsMicroscopy
Which are the two types of electron microscopes used in forensic science laboratories?
💡Correct Answer: Option B (Scanning and transmission)
The two main types of electron microscopes used in forensics are the Scanning Electron Microscope (SEM) for surface topography, and the Transmission Electron Microscope (TEM) for internal structural detail.
Q504
⚗️ ChemistryBiochemistry
Fetal hemoglobin is made up of four protein chains. They are
💡Correct Answer: Option D (2 α and 2 γ chains)
Fetal hemoglobin (HbF) is the main oxygen transport protein in human fetuses, consisting of two alpha (a) chains and two gamma (g) chains (a2g2). Adult hemoglobin (HbA) contains two alpha and two beta (b) chains.
Q505
⚗️ ChemistryBiochemistry
What type of amylase does the human saliva constitute?
💡Correct Answer: Option A (α-amylase)
Human saliva contains salivary alpha-amylase (ptyalin), which catalyzes the hydrolysis of alpha-1,4-glucosidic bonds in starch.
Q506
🧬 BiologyForensic Biology
Match the columns:
| Column 1 | Column 2 | | --- | --- | | i. Blood | a) Phadebas test | | ii. Semen | b) Christmas tree staining | | iii. Saliva | c) Nessler's test | | iv. Urine | d) Takayama crystal assay |
Choose the correct option:
💡Correct Answer: Option B (i-d, ii-b, iii-a, iv-c)
Blood is matched with Takayama crystal assay (d), Semen with Christmas tree staining for sperm heads (b), Saliva with Phadebas test for amylase (a), and Urine with Nessler's reagent test for urea/ammonia (c). This corresponds to option B.
Q507
🧬 BiologyDNA Profiling
In STR genotyping results for multiple contributors, four peaks were obtained on a single locus for a sample. What is your most probable conclusion?
💡Correct Answer: Option A (The sample is a mixture of two heterozygous individuals with no overlapping allele)
An individual has at most two alleles per autosomal STR locus. If four distinct peaks are observed, the sample must contain DNA from at least two heterozygous individuals who do not share any alleles at that locus (2 + 2 = 4 alleles).
Q508
🧬 BiologyMolecular Biology
After 6 cycles of PCR amplification process, how many number of DNA copies would be generated under ideal conditions?
💡Correct Answer: Option B (64)
Under ideal PCR conditions, DNA amplification is exponential, represented by 2^n, where n is the number of cycles. For 6 cycles, 2^6 = 64 copies are generated.
Q509
🧬 BiologyMolecular Biology
In agarose gel electrophoresis, what dye is used to visualise DNA?
💡Correct Answer: Option A (Ethidium bromide)
Ethidium bromide (EtBr) is an intercalating agent commonly used as a fluorescent tag in agarose gel electrophoresis to visualize DNA bands under ultraviolet light.
Q510
⚗️ ChemistryDNA Extraction
Arrange the steps of organic DNA extraction method in order i. Ethanol precipitation ii. Cellular lysis iii. PCI treatment iv. Gel electrophoresis
💡Correct Answer: Option B (ii, iii, i, iv)
The organic DNA extraction protocol follows this sequence: cellular lysis (ii) to break open cell membranes, Phenol-Chloroform-Isoamyl alcohol (PCI) treatment (iii) to separate proteins from DNA, ethanol precipitation (i) to concentrate DNA, and gel electrophoresis (iv) to analyze the quality/quantity of the isolated DNA.
Q511
🧬 BiologyMitochondrial DNA
In the mitochondrial DNA, uninterrupted C-stretches in the mt DNA are an example of
💡Correct Answer: Option A (Length heteroplasmy)
Homopolymeric cytosine stretches (C-stretches) in mitochondrial DNA control regions (like HVS-I or HVS-II) are highly prone to replication slippage, leading to variation in length within the same individual, which is known as length heteroplasmy.
Q512
🧬 BiologyDNA Profiling
In 1984, Sir Alec Jeffreys was the first to utilise VNTR loci for DNA fingerprinting. What technique did he use?
💡Correct Answer: Option B (Multiple locus probe technique)
Sir Alec Jeffreys developed the first DNA fingerprinting system using a multilocus probe (MLP) hybridization technique, which simultaneously targeted multiple VNTR loci across the genome.
Q513
🧬 BiologyPopulation Genetics
How would you calculate the locus genotype frequency for a heterozygous locus with allele frequencies p and q for human STR genotyping?
💡Correct Answer: Option B (2pq)
According to the Hardy-Weinberg principle, the frequency of a heterozygous genotype for two alleles with frequencies p and q is calculated as 2pq.
Q514
🧬 BiologyMitochondrial DNA
Which of the following statements related to mitochondrial DNA is INCORRECT?
💡Correct Answer: Option C (It follows Mendelian inheritance)
Mitochondrial DNA (mtDNA) is maternally inherited (uniparental), meaning it does not undergo recombination and does not follow Mendelian inheritance patterns.
Q515
🧬 BiologyGenetics
Which of the following regions of the Y chromosome does not participate in homologous recombination with the X chromosome?
💡Correct Answer: Option D (MSY)
The MSY (Male-specific region of the Y chromosome) makes up about 95% of the Y chromosome and does not undergo homologous recombination with the X chromosome, unlike the Pseudoautosomal Regions (PAR1 and PAR2).
Q516
🧬 BiologyMolecular Biology
Arrange the temperatures of Polymerase Chain Reaction in order according to the procedural steps of the reaction setup. i. 72°C ii. 60°C iii. 92°C
💡Correct Answer: Option C (iii, ii, i)
The typical steps in a PCR cycle are: Denaturation at ~92°C to 95°C (iii), Annealing of primers at ~50°C to 60°C (ii), and Extension of DNA at ~72°C (i). Hence, the order of temperatures is iii, ii, i.
Q517
🧬 BiologyAnatomy
Which of the following is an example of a sesamoid bone?
💡Correct Answer: Option D (Patella)
A sesamoid bone is a bone embedded within a tendon. The patella (kneecap) is the largest sesamoid bone in the human body.
Q518
🧬 BiologyDNA Profiling
Arrange the steps of VNTR RFLP analysis in their proper sequence i. Restriction digestion ii. Probe hybridisation iii. Gel electrophoresis iv. Blotting
💡Correct Answer: Option C (i, iii, iv, ii)
The steps of VNTR RFLP analysis are: restriction digestion of genomic DNA (i), gel electrophoresis to separate fragments by size (iii), Southern blotting to transfer DNA to a membrane (iv), and probe hybridization to target specific VNTR loci (ii). This corresponds to i, iii, iv, ii.
Q519
🧬 BiologyMolecular Biology
Match the column with respect to the different forms of DNA helical properties:
| Form | Base pairs per turn | Axial rise (nm) | | --- | --- | --- | | i. A-DNA | p. 10 | x. 0.34 | | ii. B-DNA | q. 11 | y. 0.45 | | iii. Z-DNA | r. 12 | z. 0.26 |
Choose the correct option:
💡Correct Answer: Option D (i-q-z, ii-p-x, iii-r-y)
A-DNA has 11 bp/turn and an axial rise of 0.26 nm (i-q-z). B-DNA has 10 bp/turn and an axial rise of 0.34 nm (ii-p-x). Z-DNA has 12 bp/turn and an axial rise of 0.45 nm (iii-r-y). This corresponds to option D.
Q520
⚗️ ChemistryBiochemistry
Which of the following reagents is used for the biochemical analysis of RNA?
💡Correct Answer: Option B (Orcinol)
Orcinol reagent (Bial's test) is used for the quantitative/biochemical analysis of RNA because it reacts with the ribose sugar. DPA (diphenylamine) is used for DNA, Folin-Lowry for proteins, and Ninhydrin for amino acids.
Q521
🧬 BiologyMolecular Biology
Which among the following radiolabelled probes show the highest sensitivity for DNA detection?
💡Correct Answer: Option C (32P)
Phosphorus-32 (32P) is a high-energy beta emitter that yields very high specific activity, making it the most sensitive radiolabel for DNA probe detection in hybridization assays.
Q522
🧬 BiologyMolecular Biology
The "REP" in REP-PCR stands for
💡Correct Answer: Option B (Repetitive Element)
REP-PCR stands for Repetitive Element Sequence-Based PCR, which is used for genomic fingerprinting by targeting repetitive DNA sequences.
Q523
🧬 BiologyMolecular Biology
During probe synthesis which of the following causes hairpin loop formation?
💡Correct Answer: Option B (Complementary regions within the probe)
Hairpin loops are secondary structures that form when single-stranded nucleotide sequences fold back on themselves due to complementary regions within the same molecule.
Q524
🧬 BiologyDNA Profiling
In gender typing using AMEL locus, maleness is indicated by the presence of
💡Correct Answer: Option C (Both AMEL X and AMELY)
The Amelogenin (AMEL) gene has copies on both the X and Y chromosomes. Males (XY) have both AMELX (106 bp) and AMELY (112 bp) alleles, yielding two peaks, whereas females (XX) show only one peak (AMELX).
Q525
🧬 BiologyMolecular Biology
In ASO hybridisation for SNP analysis, what is the enzyme HRP conjugated to?
💡Correct Answer: Option A (Streptavidin)
In Allele-Specific Oligonucleotide (ASO) hybridization assays, probes are often biotinylated. The enzyme Horseradish Peroxidase (HRP) is conjugated to Streptavidin, which binds with extremely high affinity to the biotinylated probe.
Q526
🧬 BiologyGenetics
Which of the following forensic genetic markers does NOT show length polymorphism?
💡Correct Answer: Option C (SNP)
SNPs (Single Nucleotide Polymorphisms) show sequence polymorphism (single base substitutions), whereas STRs, VNTRs, and LINEs vary in the length of repeated segments (length polymorphism).
Q527
🧬 BiologyDNA Profiling
Which of the following statements pertaining to STRs is INCORRECT?
💡Correct Answer: Option D (STRs exhibit maternal inheritance)
Autosomal STRs exhibit biparental (both maternal and paternal) inheritance. Only mitochondrial DNA exhibits strict maternal inheritance.
Q528
🧬 BiologyPopulation Genetics
The minimum allele frequency for a sample size of 326 individuals is
💡Correct Answer: Option D (0.0015)
A sample size of 326 diploid individuals contains 2 * 326 = 652 alleles. The minimum allele frequency is the occurrence of an allele exactly once in the sample: 1 / 652 ≈ 0.0015.
Q529
🧬 BiologyGenetics
What is the most appropriate definition of Satellite DNA?
💡Correct Answer: Option A (Extra-genic tandemly repeated DNA)
Satellite DNA consists of highly repetitive, non-coding DNA sequences that are clustered and tandemly repeated in specific regions of the genome (extra-genic tandemly repeated DNA).
Q530
🧬 BiologyForensic Biology
What part of the hair contains nerves and capillaries that supply nutrients?
💡Correct Answer: Option C (Hair papilla)
The hair papilla, located at the base of the hair follicle bulb, contains blood vessels (capillaries) and nerves that supply nutrients to the cells for hair growth.
Q531
🧬 BiologyForensic Biology
In what way, the presence of plant peroxidases may affect the result of Kastle-Meyer assay?
💡Correct Answer: Option A (By giving a false positive reaction)
The Kastle-Meyer (KM) test is a catalytic color test for blood. Plant peroxidases can mimic hemoglobin's activity by catalyzing the oxidation of phenolphthalin to phenolphthalein, resulting in a false positive reaction.
Q532
🧬 BiologyMolecular Biology
Regular DNA polymerases exhibit some activity below their optimal temperature, resulting in non-specific amplification. What type of PCR modification technique will help overcome this issue?
💡Correct Answer: Option B (Hot-start PCR)
Hot-start PCR is a technique that keeps the DNA polymerase inactive until the reaction mixture reaches the denaturation temperature, preventing non-specific primer binding and amplification at lower temperatures.
Q533
🧬 BiologyDNA Profiling
Arrange the steps for STR genotyping in order i. PCR amplification ii. Comparison with reference samples iii. Determination of STR profile iv. DNA quantification v. DNA extraction vi. Separation of STR alleles
💡Correct Answer: Option C (v, iv, i, vi, iii, ii)
The standard workflow for STR analysis is: DNA extraction (v) -> DNA quantification (iv) -> PCR amplification (i) -> separation of STR alleles (vi) -> determination of the STR profile (iii) -> comparison with reference/known samples (ii). This matches option C.
Q534
🧬 BiologyDNA Preservation
Which of the following statements related to FTA paper stand true? i. It is an absorbent cellulose-based paper ii. It protects DNA from nuclease degradation iii. It is stable at room temperature for several years iv. It prevents bacterial growth
💡Correct Answer: Option A (i, ii, iii, iv)
FTA paper is a cellulose-based card containing chemicals that lyse cells, denature proteins, protect DNA from nuclease digestion, prevent bacterial growth, and allow long-term room temperature storage of blood or saliva samples.
Q535
🧬 BiologyDNA Profiling
TPOX locus used in the CODIS-based STR kits is an example of what type of STR marker?
💡Correct Answer: Option A (Simple repeat consisting of one repeat sequence)
TPOX is a simple tetranucleotide repeat containing only one repeating sequence motif ([AATG]n) with no nonconsensus or complex structural variations.
Q536
⚗️ ChemistryBiochemistry
Rhodamine Red that is commonly used for the fluorescent labelling of DNA probes has an emission maximum at what wavelength?
💡Correct Answer: Option C (590 nm)
Rhodamine Red is a red fluorophore with an excitation maximum near 570 nm and an emission maximum at approximately 590 nm.
Q537
🧬 BiologyMolecular Biology
Who developed the technique of PCR, which is now used extensively for DNA fingerprinting?
💡Correct Answer: Option C (Kary Mullis)
Kary Mullis developed the Polymerase Chain Reaction (PCR) technique in 1983, for which he received the Nobel Prize in Chemistry in 1993.
Q538
⚗️ ChemistryBiochemistry
What are the components of an RNA nucleoside molecule?
💡Correct Answer: Option A (Ribose + Nitrogen base)
A nucleoside consists of a pentose sugar (ribose in RNA) and a nitrogenous base. A nucleotide contains a nucleoside plus a phosphate group.
Q539
🧬 BiologyGenetics
In what year was the Human Genome Project completed?
💡Correct Answer: Option C (2003)
The Human Genome Project (HGP) was officially completed and declared closed in April 2003, having sequenced 99% of the euchromatic human genome.
Q540
⚗️ ChemistryBiochemistry
The combining of multiple polypeptide chains in a large functional protein is called its
💡Correct Answer: Option D (Quaternary structure)
The quaternary structure of a protein is the association of multiple individual polypeptide chains (subunits) into a single functional multi-subunit complex.
Q541
🧬 BiologyGenetics
What is the dihybrid ratio according to the second law of Mendel?
💡Correct Answer: Option D (9:3:3:1)
Mendel's Law of Independent Assortment (second law) predicts a phenotypic ratio of 9:3:3:1 in the F2 generation of a Mendelian dihybrid cross.
Q542
🧬 BiologyGenetics
What is the study of a family tree by examination of appearing traits called?
💡Correct Answer: Option B (Pedigree analysis)
Pedigree analysis is the study of an inherited trait or condition across multiple generations of a family tree to determine its inheritance pattern.
Q543
🧬 BiologyGenetics
In snapdragons, a cross between a red flower plant and a white flower plant produces a heterozygote that has pink flowers. This is an example of
💡Correct Answer: Option D (Incomplete dominance)
Incomplete dominance occurs when the phenotype of the heterozygous genotype is an intermediate blend of the two homozygous phenotypes (e.g. pink flowers in snapdragons from red and white parents).
Q544
🧬 BiologyGenetics
What causes Barr body formation?
💡Correct Answer: Option A (X chromosome inactivation)
A Barr body is an inactive, condensed X chromosome in female mammalian somatic cells, created during early development via X-chromosome inactivation (lyonization).
Q545
🧬 BiologyForensic Biology
What fluid accounts for 60% of the seminal fluid?
💡Correct Answer: Option A (Seminal vesicle fluid)
Seminal vesicle fluid constitutes approximately 60% to 70% of the total volume of human semen, containing fructose, prostaglandins, and proteins.
Q546
🧬 BiologyForensic Biology
What component of the sweat can be used for performing a confirmatory assay?
💡Correct Answer: Option B (Dermicidin)
Dermcidin is an antimicrobial peptide expressed and secreted specifically by human eccrine sweat glands, serving as a highly specific biomarker for the identification of sweat.
Q547
🧬 BiologyGenetics
The stability of allele and genotype frequencies from one generation to the next is predicted by
💡Correct Answer: Option B (Hardy-Weinberg equilibrium)
The Hardy-Weinberg equilibrium states that in a large, random-mating population free from evolutionary forces (like mutation, selection, drift), allele and genotype frequencies remain constant over generations.
Q548
🧬 BiologyForensic Biology
Which of the following statement is FALSE?
💡Correct Answer: Option C (The width of cortex is less than the width of the medulla)
In human hair, the cortex constitutes the bulk of the hair shaft, and the medulla is very narrow (occupying less than 1/3rd of the shaft's diameter). Therefore, the width of the cortex is much GREATER than the width of the medulla, making option C false.
Q549
⚗️ ChemistryBiochemistry
A heme molecule is also called
💡Correct Answer: Option A (Ferroprotoporphyrin)
Heme is a coordination complex consisting of an iron atom in the ferrous state (Fe2+) coordinated to protoporphyrin IX, hence it is chemically referred to as ferroprotoporphyrin.
Q550
⚗️ ChemistryBiochemistry
At what linkage does Human Salivary Amylase cleave in the starch molecule?
💡Correct Answer: Option A (α1→4)
Human salivary alpha-amylase is an endo-enzyme that specifically cleaves internal alpha-1,4-glucosidic bonds in starch and glycogen molecules.
Q551
🧬 BiologyForensic Biology
What are the predominant lactate dehydrogenase isozymes present in menstrual blood?
💡Correct Answer: Option A (LDH4, LDH5)
Menstrual blood exhibits higher activity levels of Lactate Dehydrogenase isozymes LDH4 and LDH5 compared to peripheral blood, which is useful for the identification of menstrual discharge.
Q552
🧬 BiologyForensic Biology
What is examined in the hair root sheath for sex determination?
💡Correct Answer: Option C (Barr body)
For sex determination from hair roots, cells of the root sheath are stained and examined for the presence of a Barr body (which represents the inactive X chromosome in females).
Q553
🧬 BiologyDNA Profiling
A preferred procedure for analysing DNA in cases of sexual assault involving multiple unrelated perpetrators would be:
💡Correct Answer: Option D (Differential extraction followed by autosomal STR analysis)
In sexual assault cases, differential extraction is always required to separate the sperm cells from the female epithelial cells. Autosomal STR analysis is then performed on the sperm fraction to achieve maximum discrimination power, allowing the identification and individualization of each unrelated perpetrator.
Q554
🔬 Forensic ScienceForensic Law
In 1993, the U. S. Supreme court set forth a nonexclusive checklist for trial courts to use in assessing the reliability of scientific expert testimony, such as standards and controls, testing, peer review, error rate etc. What was this admissibility standard named?
💡Correct Answer: Option A (Daubert test)
The Daubert standard (Daubert v. Merrell Dow Pharmaceuticals, Inc., 1993) established that the trial judge acts as a gatekeeper to determine the admissibility of scientific expert testimony using a set of criteria.
Q555
🧬 BiologyMitochondrial DNA
What is the most polymorphic region in human mitochondrial DNA?
💡Correct Answer: Option C (D-loop)
The D-loop (displacement loop) or control region of human mitochondrial DNA contains the hypervariable regions (HV1, HV2, and HV3), which accumulate mutations rapidly and are the most polymorphic regions used for sequencing.
Q556
🧬 BiologyAnatomy
What is the major organic component of the bone matrix?
💡Correct Answer: Option B (Collagen)
Collagen (predominantly Type I collagen) constitutes about 90% of the organic matrix of bone, providing structural flexibility and tensile strength.
Q557
🧬 BiologyGenetics
In maize, a dominant allele (A) is necessary for seed color, as opposed to colorless (a). Another gene has a recessive allele (w) that results in waxy starch, as opposed to normal starch (W). The two genes segregate independently. An AaWW plant is testcrossed. What are the phenotypes and relative frequencies of offspring?
💡Correct Answer: Option A (1 (coloured seed, normal starch): 1 (colourless seed, normal starch))
The testcross is AaWW x aaww. Since W is homozygous dominant (WW) in the first parent, all offspring receive a W allele and will have normal starch (Ww). The A gene cross (Aa x aa) yields 1/2 Aa (colored) and 1/2 aa (colorless). Thus, the phenotypic ratio is 1 (colored, normal starch) : 1 (colorless, normal starch).
Q558
🧬 BiologyGenetics
A diploid organism in which both the alleles are the same at a given locus, is said to be
💡Correct Answer: Option A (Homozygous)
An individual or cell is homozygous at a given genetic locus when it carries identical alleles on homologous chromosomes.
Q559
🧬 BiologyCell Biology
What region of a chromosome do mitotic and meiotic spindle fibers attach to?
💡Correct Answer: Option A (Centromere)
During cell division, the mitotic or meiotic spindle fibers attach to the centromere region of the chromosome, specifically at the kinetochore protein complex assembled there.
Q560
🧬 BiologyCell Biology
At what phase during the mitotic cell division, does the kinetochore microtubule begin to form?
💡Correct Answer: Option B (Prometaphase)
During prometaphase of mitosis, the nuclear envelope breaks down and spindle microtubules begin to attach to the kinetochores of the chromosomes (forming kinetochore microtubules).
Q561
🧬 BiologyGenetics
A chromosomal aberration with a trisomy of chromosome 21 is known as
💡Correct Answer: Option D (Down's syndrome)
Down syndrome is a genetic disorder caused by the presence of all or part of a third copy of chromosome 21 (trisomy 21).
Q562
🧬 BiologyCell Biology
What is programmed cell death called as?
💡Correct Answer: Option A (Apoptosis)
Apoptosis is a process of programmed cell death that occurs in multicellular organisms, characterized by morphological changes and cell disassembly without damage to neighboring cells.
Q563
🧬 BiologyMolecular Biology
During DNA replication, the two parental strands separate and each one acts as a template strand for new complementary strands. What is this model of DNA replication called?
💡Correct Answer: Option B (Semiconservative)
The semiconservative model of DNA replication, proven by Meselson and Stahl, shows that each newly replicated DNA double helix consists of one intact parental (old) strand and one newly synthesized strand.
Q564
🧬 BiologyCell Biology
What process do prokaryotic cells divide by?
💡Correct Answer: Option A (Simple fission)
Prokaryotic cells (bacteria and archaea) lack a nucleus and divide via binary fission (or simple fission), a process of asexual reproduction where the cell splits into two equal parts.
Q565
⚗️ ChemistryBiochemistry
What are fatty acids containing more than one double bonds between the carbon atoms called?
💡Correct Answer: Option B (Polyunsaturated fatty acids)
Fatty acids containing two or more carbon-carbon double bonds in their hydrocarbon chain are called polyunsaturated fatty acids (PUFAs).
Q566
⚗️ ChemistryBiochemistry
Which of the following is an example of a disaccharide sugar?
💡Correct Answer: Option C (Sucrose)
Sucrose is a disaccharide sugar composed of one glucose molecule and one fructose molecule. Fructose and galactose are monosaccharides, and cellulose is a polysaccharide.
Q567
🧬 BiologyAnatomy
What part of the CNS is associated with vital reflexes such as heartbeat and respiration?
💡Correct Answer: Option C (Medulla oblongata)
The medulla oblongata (part of the brainstem in the Central Nervous System) contains cardiac, vasomotor, and respiratory centers that regulate autonomic reflexes like heartbeat, blood pressure, and breathing.
Q568
🧬 BiologyCell Biology
Which of the following statements are TRUE? i. The membrane of the endoplasmic reticulum is continuous with the outer nuclear membrane ii. The Golgi apparatus is a distinctive stack of flattened sacks called cristae iii. Peroxisomes contain enzymes that digest cellular components. iv. Mitochondria produce ATP molecules
💡Correct Answer: Option A (i and iv only)
Statement i is true (ER membrane is continuous with the outer nuclear membrane), and statement iv is true (mitochondria synthesize ATP). Statement ii is false because Golgi sacs are called cisternae (cristae are inner mitochondrial membrane folds). Statement iii is false because lysosomes contain digestive/hydrolase enzymes, while peroxisomes contain oxidative enzymes (like catalase).
Q569
🔬 Forensic ScienceForensic Science Introduction
What is the primary purpose of forensic science?
💡Correct Answer: Option D (To reconstruct crime scene)
The primary purpose of forensic science is to analyze physical evidence scientifically in order to reconstruct the events of a crime scene and assist the justice system.
Q570
🔬 Forensic ScienceCrime Scene Management
What is the first step in managing a crime scene?
💡Correct Answer: Option B (Securing the scene)
Securing the scene is the immediate first step in crime scene management to prevent contamination, alteration, or loss of evidence.
Q571
🔬 Forensic ScienceCrime Scene Searching
What is the purpose of a grid search pattern in crime scene searching?
💡Correct Answer: Option A (To cover large areas quickly)
A grid search pattern, which involves searching in perpendicular directions, is highly systematic and allows investigators to cover large and medium search areas thoroughly.
Q572
🔬 Forensic ScienceEvidence Integrity
What is the purpose of chain of custody in forensic investigations?
💡Correct Answer: Option B (To document the movement of evidence)
The chain of custody is a chronological, detailed record documenting the collection, custody, control, transfer, analysis, and disposition of physical evidence to ensure its integrity in court.
Q573
🔬 Forensic ScienceCriminology
Which of the following crimes does a White-Collar crime typically involves?
💡Correct Answer: Option B (Financial violence)
White-collar crimes are non-violent crimes committed by individuals or corporations, typically characterized by deceit or concealment for financial gain (referred to in the test options as 'Financial violence').
Q574
🔬 Forensic ScienceCrime Scene Roles
Who amongst the following is responsible for conducting and overseeing the investigation at a crime scene?
💡Correct Answer: Option C (Investigating Officer)
The Investigating Officer (I.O.) has the primary legal responsibility to conduct, coordinate, and oversee the entire investigation process at a crime scene.
Q575
🔬 Forensic ScienceCrime Scene Searching
Which of the following is not a method of crime scene searching?
💡Correct Answer: Option D (Cube search)
Grid, Zone (or Sector), and Spiral search are standard forensic search methods. 'Cube search' is not a recognized method in crime scene investigation.
Q576
🔬 Forensic ScienceCrime Scene Searching
Which of the following method of searching is most appropriate to be used for a plane crash site?
💡Correct Answer: Option C (Zone search)
For a very large, open, and complex site like a plane crash where debris is widely scattered, the Zone (or Sector) search method is most appropriate. The site is split into manageable sectors, and each is searched systematically.
Q577
🔬 Forensic ScienceCrime Scene Management
What is the correct sequence of crime scene management?
The correct logical order of evidence handling in forensic science is: Collection -> Packaging -> Forwarding -> Transportation -> Analysis. In Option C, this sequence is present (following the hyphenated typos in the exam booklet).
Q578
🔬 Forensic ScienceEvidence Packaging
What is the best way to package charred documents?
💡Correct Answer: Option A (Corrugated box with cotton base)
Charred documents are extremely fragile. They should be carefully lifted and placed in a rigid corrugated box lined with a cotton base to absorb vibrations and prevent crumbling during transport.
Q579
🔬 Forensic ScienceHistory of Forensics
The concept of 'Every contact leaves a trace' is associated with which of the following forensic scientist?
💡Correct Answer: Option C (Sir Edmond Locard)
The fundamental tenet of forensic science, 'Every contact leaves a trace', is known as Locard's Exchange Principle, formulated by Sir Edmond Locard.
Q580
🔬 Forensic ScienceCrime Scene Management
What is the first step at managing the crime scene?
💡Correct Answer: Option B (Providing first-aid to the victim)
Preservation of human life is the absolute highest priority. Providing medical first-aid to any injured victims is always the very first step upon arriving at a crime scene.
Q581
🔬 Forensic ScienceCrime Scene Management
What is the primary function of barricading the crime scene?
💡Correct Answer: Option D (To prevent contamination of crime scene)
Barricading restricts unauthorized access to the crime scene, preserving it from contamination, destruction, or alteration of crucial physical evidence by onlookers or personnel.
Q582
🔬 Forensic ScienceCrime Scene Documentation
What are the essentials in the documentation of crime scene?
The four primary methods for documenting a crime scene are photography, notes taking, sketching, and videography. These establish a permanent, visual, and written record of the scene.
Q583
🔬 Forensic ScienceCrime Scene Sketching
Which of the following is not a method of crime scene sketching?
💡Correct Answer: Option C (Strip method)
Triangulation, baseline, and polar coordinates are valid measurement methods used in crime scene sketching. The 'strip method' is a crime scene searching method, not a sketching method.
Q584
🔬 Forensic ScienceCrime Scene Processing
What is the significance of the primary walk-through at the crime scene?
💡Correct Answer: Option C (To identify potential evidence and document its location)
The primary walk-through is the initial survey of the crime scene by the investigator to observe the scene's condition, identify transient or fragile evidence, plan search strategies, and document initial locations.
Q585
🧬 BiologyQuestioned Documents
What is the full form of ESDA?
💡Correct Answer: Option A (Electrostatic Detection Apparatus)
ESDA stands for Electrostatic Detection Apparatus, which is a specialized forensic instrument used to visualize and create a permanent record of indented writing impressions on paper.
Q586
🔬 Forensic ScienceForensic Instrumentation
Match the following: i. ESDA -> a. Analysis of Indentations ii. Spectroscopy -> b. Analysis of 3-D image iii. VSC -> c. Analysis of different inks iv. Stereo microscope -> d. Composition of inks
💡Correct Answer: Option D (i-a, ii-d, iii-c, iv-b)
ESDA is used to analyze indentations (i-a). Spectroscopy determines chemical composition of inks (ii-d). VSC (Video Spectral Comparator) compares different inks under UV/IR light (iii-c). Stereo microscope provides a 3-dimensional magnified view of evidence (iv-b). This corresponds to option D.
Q587
🔬 Forensic ScienceHandwriting Analysis
Assertion (A): f and g are trizonal letters in English alphabets Reason (R): Trizonal letters have an upper, middle and lower zone to baseline
💡Correct Answer: Option D (A is false but R is true)
Assertion (A) is false because while 'f' is a trizonal letter (spans upper, middle, and lower zones), 'g' is a bizonal letter (spans only middle and lower zones). Reason (R) is true because it correctly defines a trizonal letter.
Q588
🔬 Forensic ScienceHandwriting Analysis
Match the following: 1) Writing weakness marked by irregular shaky strokes -> a) Pen emphasis 2) The element of writing movement -> b) Shading 3) The act of intermittently forcing the pen against the paper -> c) Tremor 4) A widening of pen stroke due to added pressure on pen nib -> d) Rhythm
💡Correct Answer: Option D (1-c, 2-d, 3-a, 4-b)
Shaky, irregular strokes describe tremor (1-c). Element of writing movement describes rhythm (2-d). Intermittent pressure force is pen emphasis (3-a). Widening of pen stroke due to pressure is shading (4-b). This matches option D.
Q589
🔬 Forensic ScienceDynamic Signatures
The computerized pad which recognizes the signature based on speed, pressure and rhythm of signing is called-
💡Correct Answer: Option A (Biometric Signature Pad)
A Biometric Signature Pad (or digital signature pad) captures dynamic signature features such as stroke speed, pressure, direction, and rhythm for identity verification.
Q590
📜 HistoryInk History
Which of the following is the oldest form of ink?
💡Correct Answer: Option A (Carbon ink)
Carbon ink (made from soot/fine charcoal mixed with gum or glue) is the oldest form of writing ink, used since ancient times in Egypt and China.
Q591
🧬 BiologyIntersecting Strokes
Which of the following method uses Kromekote paper?
💡Correct Answer: Option A (Determining sequence of intersecting strokes)
The Kromekote paper lifting method is a non-destructive forensic technique used to determine the sequence of intersecting ink strokes on a document.
Q592
🔬 Forensic ScienceInk Analysis
Which of the following method is used for comparison of two inks?
💡Correct Answer: Option C (Thin-layer chromatography)
Thin-layer chromatography (TLC) is the standard and most widely used chemical separation technique for comparing the organic dyes and components of two different writing inks.
Q593
🔬 Forensic ScienceHandwriting Analysis
Which of the following is depicted by the master pattern of a person's handwriting?
💡Correct Answer: Option A (Range of natural variation in the writing)
The master pattern of a person's handwriting reflects their individual writing habits, representing the range of natural variations inherent in their writing under various conditions.
💡Correct Answer: Option A (It gives space to each character according to its size)
In proportional spacing typewriters, horizontal letter spacing varies; wider letters (like 'm' or 'w') are allocated more space than narrow letters (like 'i' or 'l').
Q595
🧬 BiologyQuestioned Documents
Match the following: 1. Handwriting comparison -> a. Speed and Rhythm 2. Disguised signature -> b. Master Pattern 3. Genuine signature -> c. Tracing 4. Type of forgery -> d. Pen-lifts and pen pauses
💡Correct Answer: Option C (1-b, 2-d, 3-a, 4-c)
Handwriting comparison relies on establishing the Master Pattern (1-b). Disguised signatures show hesitations like pen-lifts and pen pauses (2-d). Genuine signatures are characterized by natural speed and rhythm (3-a). Tracing is a type of forgery (4-c). This corresponds to option C.
Q596
🧬 BiologyQuestioned Documents
Match the following: 1. Study of handwriting characteristics -> a. Tracing 2. Non-destructive technique of document examination -> b. ESDA 3. Super-imposition of two signature samples -> c. Graphology 4. Analysis of indented writing -> d. Video Spectral Comparator
💡Correct Answer: Option D (1-c, 2-d, 3-a, 4-b)
The study of handwriting characteristics for personality analysis is Graphology (1-c). VSC is a non-destructive optical analysis tool (2-d). Superimposing two identical signatures suggests tracing (3-a). Indented writing is analyzed using ESDA (4-b). This matches option D.
Q597
🔬 Forensic ScienceVSC Analysis
Statement A: VSC is often used to examine the alterations and obliterations made on a document Statement B: VSC uses UV, IR and combination of other wavelength of light sources and filters
💡Correct Answer: Option B (Both A and B are true)
Both statements are true. VSC (Video Spectral Comparator) is a vital tool for revealing document erasures, alterations, and obliterations by using multiple wavelengths of light (UV, visible, IR) and color filters to observe differences in ink luminescence.
Q598
🔬 Forensic ScienceIndented Writing
What does indented writing refers to in forensic document examination?
💡Correct Answer: Option C (Writings impressed onto papers underneath the top sheet)
Indented writing (or second-page writing) refers to the depressions or impressions left on sheets of paper beneath the one that was actually written on due to pen pressure.
Q599
🔬 Forensic ScienceOptical Examination
What is the purpose of using oblique lighting in document examination?
💡Correct Answer: Option A (To reveal alterations and erasures)
Oblique (or side-angle) lighting casts shadows in the indentations and surface disturbances of paper, helping to reveal mechanical erasures, alterations, and indented writing.
Q600
🔬 Forensic ScienceDermatoglyphics
Statement A: Fingerprints study is also called as Dermatoglyphics Statement B: Fingerprints of new born babies changes as they grow older
💡Correct Answer: Option A (A is true, B is false)
Statement A is true (dermatoglyphics is the study of skin ridges). Statement B is false because fingerprint ridge patterns are permanent and do not change from birth to death; they only grow in size.
Q601
🔬 Forensic ScienceTypewriting Analysis
Which characteristic is often examined in the analysis of typewriting?
💡Correct Answer: Option B (Ribbon impression)
In forensic typewriting analysis, examiners look closely at ribbon impressions (ink transfer details, ink composition, thread patterns) along with typeface alignment, spacing, and letter defects.
Q602
🔬 Forensic ScienceInk Analysis
What are Taggants in inks used as?
💡Correct Answer: Option D (Compounds used as markers to identify ink)
Taggants are unique chemical or physical markers added to inks by manufacturers during production to allow the identification of the ink brand, formulation, and year of manufacture.
Q603
🔬 Forensic ScienceIndented Writing
Which technique is used to uncover alterations in handwritten entries by visualising impressions on the document beneath it?
💡Correct Answer: Option A (ESDA)
ESDA (Electrostatic Detection Apparatus) is the primary technique used to visualize indented impressions left on lower sheets of paper from writing on the top sheet.
Q604
🔬 Forensic SciencePrinting Technology History
Arrange the following in ascending chronological order of their appearance: i. Manual typewriter ii. Laser printer iii. Dot-Matrix printer iv. Inkjet printer
💡Correct Answer: Option D (i, iii, iv, ii)
The chronological order is: i. Manual Typewriter (1860s/1870s) -> iii. Dot-Matrix Printer (1970) -> iv. Inkjet Printer (late 1970s/1980s) -> ii. Laser Printer (office commercialization in 1984, following mid-1970s inventions). This corresponds to option D.
Q605
🔬 Forensic ScienceOptical Examination
What is the purpose of using infrared examination in document analysis?
💡Correct Answer: Option B (To visualize hidden text)
Infrared (IR) examination is used to visualize obliterated or hidden text, detect alterations, and distinguish between different inks that react differently to infrared radiation.
Q606
🔬 Forensic ScienceSignature Examination
Match the following: a. Model signature -> 1. Any stroke that goes back over same writing stroke b. Patching -> 2. A genuine sign that has been used to prepare an imitated forgery c. Retracing -> 3. Retouching or going back over a defective portion of writing stroke d. Pen lift -> 4. An interruption in a stroke by removing writing instrument from paper
💡Correct Answer: Option D (a-2, b-3, c-1, d-4)
A model signature is a genuine signature used for imitation (a-2). Patching is the retouching of a stroke (b-3). Retracing is writing back over the same stroke (c-1). A pen lift is lifting the pen from the paper (d-4). This matches option D.
Q607
🔬 Forensic ScienceHandwriting Analysis
What is the design of letters which are fundamental to a writing system called?
💡Correct Answer: Option A (Copybook form)
The copybook form represents the basic, standardized style of letters taught to beginners in a specific school system, serving as the starting point for individual writing habits.
Q608
🔬 Forensic ScienceHandwriting Analysis
What is a blind loop in handwriting defined as?
💡Correct Answer: Option C (A loop formation completely filled with ink)
A blind loop in handwriting occurs when a curved loop letter (like 'e', 'g', or 'o') is completely filled with ink, rendering the inner white space of the loop invisible.
Q609
🔬 Forensic ScienceTypewriting Analysis
Which of the following causes the Transitory defects in the typescript?
💡Correct Answer: Option D (Clogging of the typeface)
Clogging of the typeface (due to ink ribbon lint and dust accumulating in letters like 'o' or 'e') is a transitory (temporary) defect because cleaning the keys completely removes it. Bent serifs and alignment are permanent defects.
Q610
⚗️ ChemistryChemical Erasures
Which of the following technique can be utilised to decipher the ink writing erased with chemical erasure?
💡Correct Answer: Option A (VSC)
A Video Spectral Comparator (VSC) is utilized to decipher chemical erasures by observing the document under UV or IR light, which triggers differential fluorescence in the chemical residue or altered paper fibers.
Q611
🔬 Forensic ScienceHandwriting Principles
(A): Two handwriting samples of the same content written by the same person are exactly the same and can be superimposed one on top of another. (B): Two handwriting samples written by the same person could be same because it was written by the same author during same time period
💡Correct Answer: Option D (Both A and B are incorrect)
Both statements are incorrect. Due to natural variation, a writer never produces two identical handwriting samples. Perfect superimposition is a classic sign of traced forgery, not genuine writing, regardless of the time period.
Q612
🔬 Forensic ScienceTypewriting Analysis
Which of the following is most likely to develop the individual characteristics when used a lot?
💡Correct Answer: Option A (Typewriting)
Manual typewriters develop highly specific individual characteristics with use due to mechanical wear and tear, bending of serifs, misalignment of type bars, and clog damage.
Q613
🔬 Forensic SciencePrinter Analysis
The sequence of pages in the multipage laser-printed document could be determined from the position of which type of defect marks?
💡Correct Answer: Option C (Drum defect marks)
Defects on the organic photoconductor (OPC) drum of a laser printer leave repetitive spots or marks on pages. Examining changes in these drum defect marks across pages can help determine printing sequence.
Q614
🔬 Forensic ScienceHandwriting Analysis
A writer leaves 1.5 inches to the left margin. From the following, which are the spatial characteristics that margin belongs to?
💡Correct Answer: Option A (Arrangement)
Marginal formatting and layout are classified under the spatial characteristics of page Arrangement (how writing is positioned relative to margins, edges, and paragraphs).
Q615
🔬 Forensic ScienceHistory of Forensics
Who was known to be the first to use any scientific system for personal identification?
💡Correct Answer: Option C (Sir Alphonse Bertillon)
Alphonse Bertillon developed the first scientific system of personal identification in 1879, known as Bertillonage, which utilized anthropometric measurements of bodily dimensions.
Q616
🔬 Forensic ScienceCrime Scene Management
Following are the duties of the First officer arriving at the scene of crime, EXCEPT- i. Taking notes of any vehicles leaving the scene ii. Obtaining medical assistance if needed iii. Check for hazardous or violent circumstances iv. Leaves the crime scene to do a preliminary examination
💡Correct Answer: Option D (Only iv is correct)
The first responding officer must secure the scene and must NOT leave the crime scene to conduct a preliminary examination elsewhere. Securing, checking for hazards, helping victims, and noting suspicious vehicles are correct duties, making 'iv' the exception.
Q617
🔬 Forensic ScienceEvidence Concepts
Which of the following defines physical evidence?
💡Correct Answer: Option D (Any object that can establish that a crime has or has not been committed or can link a crime and its victim or its perpetrator)
Physical evidence is most comprehensively defined as any object or material that can establish whether a crime has or has not been committed, or can link a crime to its victim or its perpetrator.
Q618
🔬 Forensic ScienceEvidence Integrity
Read the following statements and choose the correct answer A. Physical evidence can achieve its optimum value in criminal investigation only when the integrity of the evidence is maintained B. It can be achieved by the IO's thorough knowledge of the crime laboratory's techniques, capabilities and limitations
💡Correct Answer: Option C (Both A and B are correct)
Both statements are correct. Physical evidence is only useful if its integrity is maintained, which requires the Investigating Officer to be fully aware of the crime laboratory's capabilities, limitations, and standard evidence collection guidelines.
Q619
🔬 Forensic ScienceHistory of Forensics
Match the following: 1. Sir Francis Galton -> a. Fingerprints 2. Sir Edmond Locard -> b. Questioned Documents 3. Sir Alphonse Bertillon -> c. Principle of Mutual Exchange 4. Sir Albert S. Osborn -> d. Anthropometric Measurements
💡Correct Answer: Option C (a-1, b-4, c-2, d-3)
Sir Francis Galton is associated with Fingerprints (a-1). Sir Albert S. Osborn with Questioned Documents (b-4). Sir Edmond Locard with the Principle of Mutual Exchange (c-2). Sir Alphonse Bertillon with Anthropometric Measurements (d-3). This matches option C.
Q620
🔬 Forensic ScienceCrime Scene Management
Which of the following is NOT a key element of crime scene management? i. Documentation ii. Preservation of evidence iii. Identifying and interviewing suspects iv. Crowd control
💡Correct Answer: Option B ((iii) and (iv) only are correct)
Crime scene management focuses on securing the scene, documenting it (i), and preserving evidence (ii). Identifying and interviewing suspects (iii) and overall crowd control (iv) are broader police investigation/security duties, making (iii) and (iv) the correct options that are NOT part of scene management.
Q621
🔬 Forensic ScienceCrime Scene Management
How long a crime scene should typically be secured for?
💡Correct Answer: Option D (As long as necessary to complete the investigation)
A crime scene must remain barricaded and secured for as long as is necessary to conduct a thorough search, document the scene, and collect all potential physical evidence.
Q622
🧬 BiologyQuestioned Documents
What will the examination of handwriting in suicide note reveal?
💡Correct Answer: Option C (Whether the suicide note was written by victim or not)
Forensic examination of the handwriting in a suicide note is conducted to verify its authenticity, determining whether it was written by the victim or forged by someone else.
Q623
🔬 Forensic ScienceHandwriting Systems
Who introduced the muscular movement of penmanship through publication 'Palmer Guide to Muscular Movement'?
💡Correct Answer: Option A (Austin N. Palmer)
Austin Norman Palmer introduced the Palmer Method of penmanship (muscular movement writing style) in his late 19th-century publications.
Q624
🔬 Forensic ScienceForensic Instrumentation
Match the following: 1. ESDA -> a. Indentations 2. UV light source -> b. Physical matching of torn paper 3. Projectina -> c. Fluorescence 4. IR image convertor -> d. Obliterations
💡Correct Answer: Option C (a-1, b-3, c-2, d-4)
ESDA is used for indentations (a-1). UV light shows ink fluorescence (c-2). Projectina is a comparator device used for matching torn paper edges (b-3). IR image convertors reveal obliterated text (d-4). This matches option C.
Q625
🔬 Forensic ScienceTypewriting Analysis
Match the following: a. Escapement -> i. Cylinder that serves as baking for paper and absorbs blow from typeface b. Type-Ball -> ii. Typewriters that print 10 characters to the inch c. Platen -> iii. Device containing all typefaces and which by tilting, prints type characters d. PCA machines -> iv. Spacing along the line of typewriting (basic letter spacing) [Unlabeled] -> v. Machine that prints 12 characters to the inch
💡Correct Answer: Option B (a-iv, b-iii, c-i, d-ii)
Escapement refers to carriage spacing movement (a-iv). Type-Ball is IBM Selectric's element containing characters (b-iii). Platen is the rubber backing cylinder (c-i). 'PCA' represents Pica typewriters printing 10 characters per inch (d-ii). This matches option B.
Q626
🔬 Forensic SciencePrinting Technology
Lithography printing has the following characteristics: a. The printing plane is engraved to various steps resulting in a raised image on the document b. The ink is offset from the printing plate to a rubber blanket and finally to the substrate c. The printed and non-printed areas of the plate with sides on the same plane d. It relies on the principle that oil and water do not mix e. The printing process utilises raised type of embossed printed images
💡Correct Answer: Option C (b, c and d only)
Lithography is planographic (c: print/non-print areas are on the same plane) and works on the oil-and-water repulsion principle (d). In offset lithography, ink transfers from the plate to a rubber blanket, then to paper (b). Engraving/raised prints (a, e) are intaglio or letterpress features. Thus, b, c, and d only are correct.
Q627
🔬 Forensic ScienceForensic Instrumentation
What is the full form of ICP-MS?
💡Correct Answer: Option A (Inductively coupled plasma mass spectrometry)
ICP-MS stands for Inductively Coupled Plasma Mass Spectrometry, a highly sensitive analytical technique used for elemental determination in forensic samples (such as glass and inks).
Q628
🔬 Forensic ScienceSecret Inks
Match the following: a. Heat -> i. Soap b. Ammonia -> ii. Urine c. Water -> iii. Starch d. Iodine vapour -> iv. Iron salt
💡Correct Answer: Option A (a-ii, b-iv, c-i, d-iii)
This match relates to sympathetic (secret) ink developers: Heat develops urine (a-ii). Ammonia gas reacts with iron salts to develop color (b-iv). Water reveals soap residues (c-i). Iodine vapor turns blue-black in contact with starch (d-iii). This matches option A.
Q629
⚛️ PhysicsPhysics Basics
Match the following: i. Laws of Motion -> a. Velocity ii. Scalar quantity -> b. Mass iii. Linear Motion -> c. Displacement iv. Vector quantity -> d. Moment of Inertia v. Rotational Motion -> e. A body at rest remains at rest unless an external force is applied
💡Correct Answer: Option D (i-e, ii-b, iii-d, iv-a, v-c)
Laws of motion correspond to Newton's first law (i-e). Mass is a scalar quantity (ii-b). Moment of inertia is related to rotational motion (v-d). Displacement is a vector quantity (iv-a / iii-c). In option D, this is structured as: i-e, ii-b, iii-d (linear motion linked to inertia/mass concept in paper), iv-a (vector is velocity/displacement), v-c.
Q630
⚛️ PhysicsMechanics
Which type of friction occurs when an object is in motion?
💡Correct Answer: Option B (Kinetic)
Kinetic (or sliding) friction is the resistive force that acts between two solid surfaces that are moving relative to each other.
Q631
🔬 Forensic ScienceElasticity
Hooke's Law describes the relationship between stress and:
💡Correct Answer: Option B (Strain)
Hooke's Law states that within the elastic limit of a material, the stress applied is directly proportional to the strain produced.
Q632
🔬 Forensic ScienceMagnetism
The North pole of a magnet:
💡Correct Answer: Option C (Attracts the South pole of another magnet)
According to the law of magnetism, opposite poles attract each other and like poles repel. Therefore, the North pole of a magnet attracts the South pole of another magnet.
Q633
🔬 Forensic ScienceElectricity
Ohm's Law relates to:
💡Correct Answer: Option A (Voltage, current and resistance)
Ohm's Law states that the current flowing through a conductor is directly proportional to the voltage across it, related by resistance (V = I * R). It connects voltage, current, and resistance.
Q634
🔬 Forensic ScienceHolography
The principle of holography is based on the interference of:
💡Correct Answer: Option D (Coherent light waves)
Holography relies on creating and recording an interference pattern between two coherent light waves (usually from a laser): the reference beam and the object beam.
Q635
🔬 Forensic ScienceHolography
What type of hologram records the interference pattern between a reference beam and an object beam?
💡Correct Answer: Option A (Transmission hologram)
In a transmission hologram, both reference and object beams originate from the same side of the recording medium, and the hologram is reconstructed by transmitting light through it.
Q636
🔬 Forensic ScienceHolography Applications
How can holography be applied in forensic document examination?
💡Correct Answer: Option B (Detecting forgeries in signatures)
Holographic techniques (such as holographic interferometry) can measure microscopic paper deformations and pen pressure variations, helping to detect forged or traced signatures.
Q637
🔬 Forensic ScienceMeasurements
In the context of measuring instruments, the least count is:
💡Correct Answer: Option A (The smallest measurable quantity)
The least count of a measuring instrument is the smallest measurement value that can be resolved or measured accurately using that instrument.
Q638
⚛️ PhysicsMechanics
What is the maximum velocity of a car of mass 100 kg can go round a level curve without skidding? (g=10m/s² µ between road and tyre = 0.6, Radius of curvature = 20m).
💡Correct Answer: Option B (10 m/s)
The maximum velocity without skidding on a level road is v_max = sqrt(μ g R). Substituting the values: v_max = sqrt(0.6 10 20) = sqrt(120) ≈ 10.95 m/s. The closest safe integer speed is 10 m/s (12 m/s exceeds the limit).
Q639
🔬 Forensic ScienceMeasurements
The Accuracy in measurement refers to:
💡Correct Answer: Option A (The closeness of a measurement to the true value)
Accuracy describes how close a measured value is to the actual, true reference value. Precision, on the other hand, describes the consistency of repeated measurements.
Q640
⚛️ PhysicsLasers
What is the full-form of LASER?
💡Correct Answer: Option A (Light Amplification by Stimulated Emission of Radiation)
LASER stands for Light Amplification by Stimulated Emission of Radiation, indicating that the light is amplified by forcing excited atoms to emit coherent photons.
Q641
⚛️ PhysicsLasers
(A): Laser light is monochromatic (B): Coherence in laser light refers to wavelength consistency
💡Correct Answer: Option C (Both (A) and (B) are correct)
Both statements are correct. Laser light is monochromatic (consists of a single color/wavelength) and coherent (the light waves are in phase, maintaining spatial and temporal consistency).
Q642
⚛️ PhysicsLasers
The brightness of a laser beam is a measure of its:
💡Correct Answer: Option A (Intensity)
The extreme brightness or radiance of a laser beam is directly related to its high intensity (amount of optical power concentrated per unit area and solid angle).
Q643
⚛️ PhysicsLaser Types
Match the following: 1. CO₂ lasers composed of -> a. Rare-earth ions 2. N₂ lasers operate in of EMR spectrum -> b. Visible region 3. Ar-ion laser emits light in of EMR spectrum -> c. Molecular gas 4. Glass lasers composed of -> d. Infra-Red region
💡Correct Answer: Option A (1-c, 2-d, 3-b, 4-a)
CO2 is a molecular gas laser (1-c). N2 laser operates in ultraviolet but is matched to infrared in paper options (2-d). Ar-ion laser emits visible blue-green light (3-b). Glass lasers are doped with rare-earth ions (4-a). This matches option A.
Q644
⚛️ PhysicsLasers
YAG in YAG lasers stands for:
💡Correct Answer: Option C (Yttrium Aluminium Garnet)
Nd:YAG lasers use Yttrium Aluminium Garnet (Y3Al5O12) crystal as the solid-state host medium, doped with neodymium ions.
Q645
⚛️ PhysicsLasers
The beam width of a Gaussian beam is defined as the distance between points where the intensity drops to:
💡Correct Answer: Option B (50%)
In Gaussian beam analysis, the beam width can be defined at the Full Width at Half Maximum (FWHM), where the intensity drops to 50% of its peak value.
Q646
🔬 Forensic ScienceGaussian Beams
Statement (A): A Gaussian beam is characterised by a bell-shaped intensity curve Statement (B): A Gaussian beam has uniform intensity across the beam Statement (C): A Gaussian beam shows exponential decrease in intensity
💡Correct Answer: Option B (Only A and C are correct)
A Gaussian beam has a bell-shaped radial intensity profile (A is true) and decreases exponentially as a function of the square of the distance from the beam axis (C is true). It does not have uniform intensity (B is false). Thus, only A and C are correct.
Q647
⚛️ PhysicsLaser Types
Excimer lasers typically use a combination of:
💡Correct Answer: Option C (Noble gases and halogens)
Excimer lasers (excited dimer lasers) use a mixture of a noble gas (such as Argon, Krypton, or Xenon) and a reactive halogen gas (Fluorine or Chlorine) to produce ultraviolet laser light.
Q648
⚛️ PhysicsLaser Types
The HCl and HF lasers operate in the-
💡Correct Answer: Option D (IR region)
Hydrogen Chloride (HCl) and Hydrogen Fluoride (HF) chemical lasers operate and emit light in the infrared (IR) region of the electromagnetic spectrum.
Q649
⚛️ PhysicsLaser Properties
Compared to traditional light sources, lasers typically have:
💡Correct Answer: Option D (Higher intensity, directionality and coherence)
Lasers are distinguished from ordinary light sources by their high intensity, high directionality (low divergence), monochromaticity, and high coherence.
Q650
⚛️ PhysicsLaser Properties
Compared to traditional light sources, lasers generally have:
💡Correct Answer: Option A (Greater brightness)
Due to the highly focused concentration of light energy, lasers possess a much greater brightness (radiance) compared to any traditional or thermal light sources.
Q651
🔬 Forensic ScienceForensic Instrumentation
What does AAS stand for in context of spectroscopy?
💡Correct Answer: Option B (Atomic Absorption Spectroscopy)
AAS stands for Atomic Absorption Spectroscopy, which is an analytical technique used to measure the concentration of metallic elements in a sample by measuring the light absorbed by free atoms.
Q652
🔬 Forensic ScienceForensic Instrumentation
What is the full form of FTIR spectroscopy?
💡Correct Answer: Option D (Fourier Transform Infrared spectroscopy)
FTIR stands for Fourier Transform Infrared spectroscopy, a technique used to obtain an infrared absorption or emission spectrum of a solid, liquid, or gas for chemical identification.
Q653
🔬 Forensic ScienceForensic Instrumentation
What are micro-spectrophotometers used for?
💡Correct Answer: Option A (Analyse spectral features of micro-sized samples)
Micro-spectrophotometers combine a microscope with a spectrophotometer, allowing forensic examiners to analyze the optical and spectral absorption features of microscopic samples (such as single ink lines or fibers).
Q654
⚛️ PhysicsChromatography
Which chromatography technique is known for its separation based on boiling point?
💡Correct Answer: Option B (GC (Gas Chromatography))
Gas Chromatography (GC) separates volatile substances based on their boiling points and vapor pressure, along with partition coefficients between a gas mobile phase and a liquid/solid stationary phase.
Q655
🔬 Forensic ScienceForensic Instrumentation
GC-MS spectroscopy combines gas chromatography with-
💡Correct Answer: Option B (Mass Spectrometry)
GC-MS combines Gas Chromatography (for separating mixture components) with Mass Spectrometry (for identifying the chemical structure of each separated component).
Q656
🔬 Forensic ScienceForensic Law
Match the following: i. Section 464, IPC -> a Making of false document ii. Section 463, IPC -> b. Punishment for forgery iii. Section 45, IEA -> c. Opinion of handwriting expert iv. Section 405, IPC -> d. Criminal breach of trust
💡Correct Answer: Option D (a-i, b-ii, c-iii, d-iv)
Section 464 IPC deals with making a false document (a-i). Section 463 IPC defines forgery, with options pairing it to punishment (b-ii). Section 45 IEA deals with expert opinion (c-iii). Section 405 IPC deals with criminal breach of trust (d-iv). This matches option D.
Q657
🔬 Forensic ScienceForensic Law
Which section of Indian Penal Code deals with Joint liability in the commission of an offence?
💡Correct Answer: Option B (Section 45)
Conceptually, Section 34 of the IPC deals with joint liability (acts done by several persons in furtherance of common intention). In the exam question options, Section 45 (Option B) was the designated correct answer key, likely due to a typographical error in the paper representing Section 34.
Q658
🔬 Forensic ScienceHandwriting Analysis
Disguise in handwriting by unaccustomed hand means: i. To write with right hand by left-handed writer ii. To write with right hand by right-handed writer iii. To write with left hand by a right-handed writer iv. To write with left hand by left-handed writer
💡Correct Answer: Option D (i and iii are correct)
Writing with the unaccustomed (non-dominant) hand is a common disguise. A left-handed writer writes with the right hand (i), and a right-handed writer writes with the left hand (iii). Thus, i and iii are correct.
Q659
🔬 Forensic ScienceHandwriting Analysis
In forensic document examination, what does the term 'allograph' refer to?
💡Correct Answer: Option A (Distinctive handwriting feature)
An allograph is a variant shape or design of a letter (grapheme) in a particular handwriting style, representing a distinctive handwriting feature of the writer.
Q660
🔬 Forensic ScienceForgery Types
Which type of forgery involves the signing on a document with the intent to deny it's ownership later?
💡Correct Answer: Option D (Disguise)
Disguise (sometimes called self-forgery) involves intentionally altering one's own writing or signature with the motive of later denying having ever signed or executed the document.
Q661
🔬 Forensic ScienceForgery Types
Match the following: i. Superimposition -> a. Simulated forgery ii. Freehand forgery -> b. Copy-paste iii. Practiced hand forgery -> c. By memory iv. Lifted forgery -> d. Traced forgery
💡Correct Answer: Option D (a-iii, b-iv, c-ii, d-i)
Simulated forgery is practiced hand forgery (a-iii). Copy-paste forgery corresponds to lifted forgery (b-iv). Freehand forgery from memory without a model is c-ii. Traced forgery shows exact superimposition (d-i). This matches option D.
Q662
🔬 Forensic ScienceDocument Alterations
Alterations in document involves all of the following EXCЕРТ-
💡Correct Answer: Option A (Natural variations in running text)
Document alterations include physical/chemical erasures, additions, deletions, overwriting, and obliterations. 'Natural variations' are the inherent, normal fluctuations in a person's genuine writing and are not alterations.
Q663
🔬 Forensic ScienceDocument Alterations
Which term is used when a portion of a document is intentionally concealed or covered?
💡Correct Answer: Option C (Deletion)
In document examination, intentionally covering, scraping off, or hiding a portion of a text is classified under document deletion (or obliteration). In the options, 'Deletion' is the most appropriate term.
Q664
🔬 Forensic ScienceIndented Writing
The examination of document indents is useful in detecting -
💡Correct Answer: Option C (Hidden writing impressions)
Analyzing paper indentations (writing impressions) is useful for recovering hidden writing from sheets of paper that were beneath the sheet of paper that was written on.
Q665
🔬 Forensic ScienceEvidence Preservation
How should wet and charred documents be preserved at a crime scene to minimise further damage?
💡Correct Answer: Option B (Freeze-dry)
Freeze-drying is the best method to dry wet, extremely fragile charred documents because it sublimates ice directly to gas, avoiding liquid tension that crumbles the paper.
Q666
🔬 Forensic ScienceHandwriting Factors
Which of the following is an internal factor (cannot be controlled) affecting a person's handwriting?
💡Correct Answer: Option A (Handwriting change due to ageing)
Ageing is a gradual, permanent, and uncontrollable internal physiological factor that alters handwriting. Intoxication, drowsiness, and minor injuries are temporary or external factors.
Q667
🔬 Forensic ScienceSignature Examination
Which of the following are characteristics of a genuine signature?
💡Correct Answer: Option A (Rhythm, speed, flow)
Genuine signatures are written with natural speed, flow, and consistent rhythm. Forged signatures tend to show hesitation, tremors, pen pauses, and unnatural pen lifts.
Q668
🔬 Forensic ScienceHandwriting Principles
The little variability in a person's handwriting that occurs over time is known as:
💡Correct Answer: Option D (Natural variations)
No person writes exactly the same way twice. The slight, normal deviations in letter size, shape, and slope in a person's handwriting are called natural variations.
Q669
🔬 Forensic ScienceHandwriting Analysis
In forensic document examination, the presence of consistent letter formation and spacing is considered as:
💡Correct Answer: Option B (Individual characteristics)
Consistent, unique habits of letter formation, slant, connection, and spacing are individual characteristics that distinguish one person's handwriting from another.
Q670
🔬 Forensic ScienceSignature Examination
The distinctive features that makes a person's signature recognizable and unique fall under the category of:
💡Correct Answer: Option B (Individual characteristics)
Unique flourishes, letter connections, and details in a signature that allow it to be distinguished from all others are classified as individual characteristics.
Q671
🔬 Forensic ScienceCounterfeit Detection
Which of the following features are examined while detecting counterfeiting in currency notes? 1. Microprinting 2. Watermark 3. Optical fibres 4. OVI (optical variable ink) 5. Signature of the governor
💡Correct Answer: Option A (All 1,2,3,4,5)
To verify banknotes, examiners check all security features including microprinting, watermarks, fluorescent optical fibers, Optically Variable Ink (OVI), and the details of the governor's signature.
Q672
🔬 Forensic SciencePassport Security
What security feature is commonly used in passports to prevent tampering and forgery?
💡Correct Answer: Option C (Hologram)
Holograms (or holographic laminates) are placed over the biographical data page in passports to prevent alteration and copying of photo or details, making counterfeiting extremely difficult.
Q673
🔬 Forensic ScienceSeal Impressions
Which of the following technique is used for comparison of two seal impressions for authenticity?
💡Correct Answer: Option D (Comparison microscope)
A comparison microscope is the standard instrument used to compare the details of two seal impressions side-by-side or superimposed under identical lighting and magnification.
Q674
🔬 Forensic SciencePrinter Analysis
What characteristic is commonly analyzed to differentiate between various printers in computer-printed documents?
💡Correct Answer: Option D (Dot pattern)
Computer printers use specific technologies (like inkjet nozzle arrays or laser raster patterns) that leave unique dot patterns and configurations, helping examiners identify the printer technology and model.
Q675
🔬 Forensic SciencePassport Security
What is the purpose of using UV printing in passports and travel documents?
💡Correct Answer: Option C (To prevent photocopying)
UV-activated fluorescent inks are invisible under normal light and do not show up when photocopied with standard color copiers, helping to prevent unauthorized photocopying and reproduction.
Q676
🔬 Forensic ScienceFinancial Fraud
What term refers to the unauthorized copying of credit card information onto a counterfeit card for fraudulent transactions?
💡Correct Answer: Option A (Skimming)
Skimming is the illegal capturing and copying of the magnetic stripe data from a credit or debit card using a reading device, which is later written onto a counterfeit card.
Q677
🔬 Forensic ScienceFinancial Fraud
In credit cards forgery investigations, what is often examined to determine the authenticity of a card, especially when comparing a genuine card with a suspected counterfeit? 1. Magnetic stripe data 2. Embossed characters 3. Signature panel
💡Correct Answer: Option C (All 1,2 and 3)
To determine credit card authenticity, investigators analyze the magnetic stripe data, the size/alignment of embossed characters, and the security features of the signature panel. Thus, all 1, 2, and 3 are examined.
Q678
🔬 Forensic ScienceHistory of Forensics
The first Sherlock Holmes novel, A Study in Scarlet, published in
💡Correct Answer: Option C (1887)
A Study in Scarlet, Arthur Conan Doyle's first Sherlock Holmes novel, was written in 1886 and published in Beeton's Christmas Annual in November 1887.
Q679
⚗️ ChemistryLocard Principle
Locard's exchange principle can be applied to all of the following except
💡Correct Answer: Option B (Blood spatter can be used to identify direction of force.)
Locard's Exchange Principle states that 'every contact leaves a trace' (transfer of physical material like fibers, tool marks, and soil). Blood spatter analysis is based on physics and geometry to reconstruct directionality of forces, not on the transfer of trace material.
Q680
🔬 Forensic ScienceForensic Law
Which of the following may result in inadmissibility of evidence in court?
💡Correct Answer: Option D (An expert fails to prove his/her expertise in the area for which court has asked his/her opinion.)
If an expert witness fails to prove their competence and specialized knowledge in the relevant field under Section 45 of the Indian Evidence Act, their opinion and evidence will be ruled inadmissible in court.
Q681
🔬 Forensic ScienceForensic Psychiatry
Which of the following rules/law is not associated with Criminal responsibility of mentally ill person:
💡Correct Answer: Option C (Black's Law)
The Durham Rule and Curren's Rule are legal tests used to determine criminal insanity and responsibility. 'Black's Law' refers to Black's Law Dictionary, a reference book, not a rule of criminal responsibility.
Q682
🔬 Forensic ScienceHistory of Forensics
In response to the rising demands of providing high technology to the crime investigation process, BPR&D established the first Forensic DNA Typing facility at CFSL, Calcutta, during
💡Correct Answer: Option A (1998)
The Bureau of Police Research and Development (BPR&D) established India's first Central DNA Typing Unit at the Central Forensic Science Laboratory (CFSL), Calcutta in 1998.
Q683
📜 HistoryHistory of Fingerprints
The first Central Fingerprint Bureau of India was established in India in the year
💡Correct Answer: Option B (1897)
The world's first Central Fingerprint Bureau (CFPB) was established in Calcutta, India, in June 1897, after the classification system developed by Sir Edward Richard Henry, Hem Chandra Bose, and Qazi Azizul Haque was approved.
Q684
🔬 Forensic ScienceHistory of Forensics
The first Forensic Science Laboratory established in India in
💡Correct Answer: Option C (Calcutta)
The first state Forensic Science Laboratory in India was established in Calcutta, West Bengal, in the year 1952.
Q685
🔬 Forensic ScienceHistory of Forensics
The first National Crime Records Bureau (NCRB) in India was established in 1905 in
💡Correct Answer: Option B (Shimla)
In 1905, the central fingerprint records and intelligence bureau under the Criminal Intelligence Department (CID) was established at Shimla.
Q686
🔬 Forensic ScienceCrime Scene Sketching
A crime-scene sketch should include all of the following except
💡Correct Answer: Option D (The type of search pattern used to collect the evidence)
A crime scene sketch must show measurements, scale, orientation (North arrow), date, time, and location. It does not document the search pattern used by the investigators to find the evidence.
Q687
🔬 Forensic ScienceForensic Law
Report given by Serologist may be considered to be an evidence in court under
💡Correct Answer: Option B (CrPC 293)
Section 293 of the Code of Criminal Procedure (CrPC) allows reports signed by government scientific experts (such as Chemical Examiners, Serologists, and FSL Directors) to be used as evidence in any inquiry or trial without calling them to court.
Q688
🔬 Forensic ScienceCrime Scene Documentation
Which of the following is a primary characteristic of Video recording of a crime scene?
💡Correct Answer: Option B (Detailed view of crime scene can be obtained.)
The primary function of videography is to provide a continuous, detailed, and comprehensive overview of the entire crime scene layout, showing spatial relationships between objects.
Q689
🔬 Forensic ScienceCrime Scene Documentation
Scaling as a tool is used in
💡Correct Answer: Option C (Sketching and Photography)
Scaling is critical in crime scene sketching (mapping measurements to a scaled drawing) and forensic photography (placing a physical scale next to evidence to show size in photos).
Q690
🔬 Forensic ScienceForensic Principles
Read the two statements and answer accordingly.
Statement A: - A forensic scientist must be called to reconstruct a crime scene. Statement B: - Experience is the only factor in the effectiveness of a forensic expert.
💡Correct Answer: Option C (Both A and B are false)
Both statements are false. Investigating officers or trained crime scene technicians can reconstruct scenes (A is not a strict 'must' for a laboratory scientist). For B, scientific education, validated methods, and continuous training are just as important as experience.
Q691
⚗️ ChemistryEvidence Classification
Which of the following is individual evidence?
💡Correct Answer: Option A (DNA)
DNA profiling provides the power of individualization (uniquely identifying a single person). Glass, tire marks, and plastic bags possess class characteristics unless they have unique microscopic fractures or wear features.
Q692
🔬 Forensic ScienceEvidence Collection
Correct collection of evidence requires which of the following?
💡Correct Answer: Option D (All of the above)
Proper evidence processing requires documenting its location, packing it correctly in appropriate containers to prevent degradation, and maintaining a strict chain of custody.
Q693
⚗️ ChemistryImpression Evidence
3-D tool marks can be best preserved by
💡Correct Answer: Option B (Casting)
Three-dimensional tool marks (like impressions in wood or metal) are best preserved and recorded by making a physical cast (using silicone rubber, dental stone, or plaster).
Q694
⚗️ ChemistryArson Investigation
Which of the following is not an evidence for the point of origin of fire?
💡Correct Answer: Option B (Burned clothes)
Burned clothes are simply items consumed by fire and do not indicate origin. In contrast, fire trails, accelerants, and the area of most intense burning directly point to where the fire started.
Q695
⚛️ PhysicsMicroscopy
All of the following are the Basic Principles of Light Microscopy EXCEPT:
💡Correct Answer: Option B (Objective lens minimizes the image of the specimen)
The objective lens in a microscope magnifies (enlarges) the image of the specimen; it does not minimize it.
Q696
🔬 Forensic ScienceEvidence Collection
All of the following are the common precautions to be taken care of to avoid destruction of evidences at the scene of crime EXCEPT:
💡Correct Answer: Option D (Semen stains must not be thoroughly air dried prior to sealing and packing)
Semen and all biological samples must be thoroughly air-dried at room temperature before packaging in breathable containers. Sealing wet samples leads to bacterial growth and DNA degradation.
Q697
⚗️ ChemistryExplosives Analysis
________ is universally accepted broad-spectrum solvent for majority of organic explosives such as RDX, HMX, TNT, PETN etc.
💡Correct Answer: Option D (Acetone)
Acetone is the universally preferred solvent in forensic laboratories for extracting organic explosives (like RDX, HMX, TNT, and PETN) from post-blast debris.
Q698
⚗️ ChemistryImpression Evidence
Which of the following is NOT the basic method of recording footwear impressions at the crime scene?
💡Correct Answer: Option A (Tran-scripting the recording process)
Footwear impressions are recorded using photography/sketching (documentation), casting (for 3D impressions), and lifting (for 2D dust prints). 'Tran-scripting' is not a method.
Q699
⚗️ ChemistryExplosives Analysis
Which of the following is not an example of improvised explosive device
💡Correct Answer: Option D (Grenade)
A military hand grenade is a standardized, factory-manufactured ordnance. Fuse bombs, Molotov cocktails, and percussion cup bombs are examples of homemade Improvised Explosive Devices (IEDs).
Q700
⚗️ ChemistryMeasurements
Which of the following terms refers to the degree to which a measurement approaches the true value of the quantity being measured?
💡Correct Answer: Option B (Accuracy)
Accuracy refers to how close a measured value is to the true, actual value. Precision refers to the reproducibility or consistency of repeated measurements.
Q701
⚗️ ChemistryMeasurements
Which of the following measurements has the highest precision?
💡Correct Answer: Option D (0.5251 cm)
Precision is indicated by the resolution of the measurement (the number of decimal places). 0.5251 cm has four decimal places, representing the highest precision.
Q702
🔬 Forensic ScienceForensic Law
In what section of Indian Evidence Act is the definition of experts specified.
💡Correct Answer: Option B (Section-45)
Section 45 of the Indian Evidence Act, 1872, specifies that when the Court has to form an opinion upon a point of foreign law, science, art, or identity of handwriting or finger impressions, the opinions of persons specially skilled (experts) are relevant facts.
Q703
🔬 Forensic ScienceForensic Law
Under what section of Indian Evidence Act is the discretion on the admissibility of evidence defined.
💡Correct Answer: Option A (Section- 136)
Section 136 of the Indian Evidence Act, 1872, gives the judge the absolute discretion to decide whether a proposed piece of evidence is admissible or relevant in the court proceedings.
Q704
🔬 Forensic ScienceForensic Law
Under section 304B of IPC, death of a women under other than normal circumstances within ________ years of marriage shall be called "Dowry Death".
💡Correct Answer: Option B (Seven)
Under Section 304B of the Indian Penal Code, the death of a woman must occur within seven years of her marriage under abnormal circumstances, with evidence of dowry harassment, to be classified as a Dowry Death.
Q705
⚗️ ChemistryNarcotics Chemistry
Smack is a variable mixture of
💡Correct Answer: Option B (Heroin)
Smack is a common street/slang name for heroin (diacetylmorphine), which is a semi-synthetic opioid drug derived from morphine.
Q706
⚗️ ChemistryPharmacology
What is the slowest route of administration for cannabis.
💡Correct Answer: Option C (Dermal)
Dermal (topical absorption through the skin) is the slowest and least efficient route of administration for cannabis due to the highly lipophilic nature of cannabinoids and the barrier properties of the skin.
Q707
⚗️ ChemistryNarcotics Chemistry
What drug is loaded on bloater sheets also before consumption.
💡Correct Answer: Option C (LSD)
LSD (Lysergic acid diethylamide) is highly potent in microgram doses. It is dissolved in solvent and loaded onto absorbent paper squares called blotter sheets (often referred to as bloater sheets) for oral ingestion.
Q708
⚗️ ChemistryToxicology
Peyote cactus causes what type of mental effect on consumption.
💡Correct Answer: Option C (Hallucinogenic)
Peyote cactus (Lophophora williamsii) contains the alkaloid mescaline, which acts as a powerful hallucinogen, causing altered states of perception and visual hallucinations.
Q709
⚗️ ChemistryScreening Tests
Duquenois-Levine test is the screening test for
💡Correct Answer: Option A (Cannabis)
The Duquenois-Levine test is a classic, highly specific presumptive color test used to screen for cannabinoids in suspected cannabis plant materials.
Q710
⚗️ ChemistryClandestine Labs
What is not part of the glassware encountered in a raid for clandestine narcotic lab?
💡Correct Answer: Option C (Hydrometers)
Round bottom flasks, separating funnels, and beakers are standard laboratory glassware. A hydrometer is an instrument used to measure the specific gravity of liquids, not a piece of laboratory glassware.
Q711
⚗️ ChemistryColor Tests
Formaldehyde and Sulphuric acid form a part of what reagent for spot examination of narcotics.
💡Correct Answer: Option B (Marquis Reagent)
Marquis reagent is prepared by mixing concentrated sulfuric acid with formaldehyde. It is widely used to screen for opiates (purple color) and amphetamines (orange/brown color).
Q712
🧬 BiologyAnalytical Instrumentation
What technique is most preferred for the characterization of illicit drugs.
💡Correct Answer: Option B (Gas Chromatography-Mass Spectroscopy)
Gas Chromatography-Mass Spectrometry (GC-MS) is the preferred analytical technique for the definitive characterization and confirmation of illicit drugs due to its high separation power and structural mass spectral identification.
Q713
⚗️ ChemistryPrecursor Chemistry
Safrole can be used to synthesize.
💡Correct Answer: Option B (MDMA)
Safrole, extracted from sassafras oil, is a controlled precursor chemical used in clandestine laboratories as the starting material to synthesize MDMA (Ecstasy).
Q714
⚗️ ChemistryNatural Drugs
LSD is obtained from.
💡Correct Answer: Option B (Fungus)
Lysergic Acid Diethylamide (LSD) is a semi-synthetic drug synthesized from lysergic acid, which is produced by the Claviceps purpurea fungus (ergot) that grows on rye.
Q715
⚗️ ChemistryNatural Drugs
Mescaline is an example of.
💡Correct Answer: Option C (Natural drug)
Mescaline is a naturally occurring psychotropic alkaloid found in the peyote cactus (Lophophora williamsii) and san pedro cactus, making it a natural drug.
Q716
⚗️ ChemistryNarcotics Slang
"Chasing the dragon" is common slang for
💡Correct Answer: Option A (Snorting of Heroin)
The term 'Chasing the dragon' refers to inhaling the vapor of heated heroin (usually off foil). To align with the official exam key, Option A (Snorting of Heroin) is selected as it is the only option that references heroin.
Q717
⚗️ ChemistryCriminology
Which of the following is an important factor in substance abuse?
💡Correct Answer: Option C (Whether the user or its peers regularly engage in drug abuse)
Peer influence and personal history of substance use (whether the user or their social peer group regularly engage in drug abuse) are primary risk factors in substance abuse.
Q718
⚗️ ChemistryPeriodic Table Properties
Which of the following elements have electron affinity greater than S?
💡Correct Answer: Option D (None of these)
In Group 16, Sulfur (S) has the highest electron affinity (-200 kJ/mol). Oxygen (O) is smaller but suffers from high electron repulsion (-141 kJ/mol), while Selenium (-195 kJ/mol) and Tellurium (-190 kJ/mol) have lower affinities due to size. Thus, none of these have an affinity greater than S.
Q719
⚗️ ChemistryGroup 14 Chemistry
The correct order of stability of difluorides is
💡Correct Answer: Option A (GeF₂ > SiF₂ > CF₂)
Down Group 14, the stable oxidation state changes from +4 to +2 due to the inert pair effect. Therefore, the stability of difluorides (where Group 14 elements are in the +2 oxidation state) increases down the group: GeF2 > SiF2 > CF2.
Q720
⚗️ ChemistryAcid-Base Chemistry
A strong acid has a
💡Correct Answer: Option B (weak conjugate base)
According to Bronsted-Lowry theory, a strong acid easily donates its proton, which means its remaining conjugate base has very little affinity for protons (it is a weak conjugate base).
Q721
⚗️ ChemistryHSAB Theory
According to HSAB, a hard base is one whose donor atom has
💡Correct Answer: Option B (High electronegativity, low polarizability and difficult to oxidize)
According to the Hard-Soft Acid-Base (HSAB) principle, a hard base is characterized by a donor atom with high electronegativity, low polarizability, and high resistance to oxidation.
Q722
⚗️ Chemistrys-Block Chemistry
Which of the following is not correct about the solution when moderate amount of sodium metal is dissolved in liquid ammonia at low temperature?
💡Correct Answer: Option D (Liquid ammonia remains diamagnetic)
When sodium dissolves in liquid ammonia, it produces Na+ ions and solvated electrons. The free solvated electrons make the solution blue, highly conducting, and paramagnetic (not diamagnetic). Therefore, statement D is incorrect.
Q723
⚗️ ChemistryOrganometallic Chemistry
The following reaction: Mn₂(CO)₁₀ + Br₂ → 2MnBr(CO)₅, is:
💡Correct Answer: Option D (Oxidative addition)
In the reactant Mn2(CO)10, the oxidation state of Mn is 0. In the product MnBr(CO)5, the oxidation state of Mn increases to +1. Since both the oxidation state and coordination number increase, it is an oxidative addition reaction.
Q724
⚗️ ChemistryOrganometallic Chemistry
The stable cyclopentadienyl complex of beryllium is:
💡Correct Answer: Option D ([Be(η¹-C₅H₅)(η⁵-C₅H₅)])
Due to Be's very small ionic size, stable beryllocene in the gas phase adopts a slip-sandwich structure represented as [Be(η¹-C₅H₅)(η⁵-C₅H₅)], where one cyclopentadienyl ring is monohapto and the other is pentahapto.
Q725
⚗️ ChemistryOrganometallic Chemistry
Which of the following is more easily reduced?
💡Correct Answer: Option A (V(CO)₆)
V(CO)6 is a 17-valence electron complex. It is highly unstable and easily accepts an electron (gets reduced) to achieve a stable 18-electron closed-shell configuration [V(CO)6]-. Cr(CO)6, Fe(CO)5, and Ni(CO)4 are already stable 18-electron complexes.
Q726
⚗️ ChemistryToxicology
Identify the alkaloid used as antidote against insecticides and nerve gases
💡Correct Answer: Option D (Atropine)
Atropine is a muscarinic receptor antagonist that is used clinically as an antidote to counteract the effects of poisoning by organophosphate insecticides and nerve agents.
Q727
⚗️ ChemistryBiomolecules
Test that can distinguish between monosaccharides and disaccharides is
💡Correct Answer: Option B (Barfoed's test)
Barfoed's test utilizes copper acetate in dilute acetic acid. Reducing monosaccharides react quickly (within 1-2 minutes) to form a red cuprous oxide precipitate, whereas reducing disaccharides react much slower (7-12 minutes).
Q728
⚗️ ChemistryBiomolecules
How many polypeptide chains are present in Haemoglobin and creatine phosphokinase
💡Correct Answer: Option C (Four, two)
Hemoglobin is a tetramer consisting of four polypeptide chains (two alpha and two beta). Creatine phosphokinase (CPK) is a dimer consisting of two polypeptide subunit chains (M and B). Therefore, the correct counts are four and two.
Q729
⚗️ ChemistrySample Preparation
What is the sample preparation technique for extraction of alcohol from water.
💡Correct Answer: Option B (Distillation)
Simple distillation is the standard sample preparation technique used to separate and extract volatile ethanol (alcohol) from aqueous solutions like blood or urine.
Q730
🧬 BiologyAnalytical Instrumentation
Which of the following techniques can be used for qualitative and quantitative estimation of a known impurity in a drug substance?
💡Correct Answer: Option A (HPLC)
High-Performance Liquid Chromatography (HPLC) is the most widely used and preferred analytical technique for both separating (qualitative identification via retention time) and quantifying impurities in pharmaceutical drug substances.
Q731
⚗️ ChemistrySample Preparation
Wet digestion is not recommended for what metal.
💡Correct Answer: Option A (Mercury)
Mercury is highly volatile. Standard hot wet digestion (open vessel acid digestion) is not recommended because mercury compounds readily volatilize and escape, leading to low recovery. Closed-vessel microwave digestion must be used instead.
Q732
🧬 BiologySecurity Instrumentation
What technique is most preferred for trace analysis of narcotics during security check.
💡Correct Answer: Option B (Handheld IMS)
Handheld Ion Mobility Spectrometry (IMS) is the preferred technology at security checkpoints (airports, border control) due to its high speed (seconds) and extreme sensitivity for trace vapors and residues of narcotics and explosives.
Q733
⚗️ ChemistryColor Tests
What transition metal is used in preparation of Mandelin's Reagent.
💡Correct Answer: Option B (Vanadium)
Mandelin's reagent is prepared by dissolving ammonium metavanadate (NH4VO3) in concentrated sulfuric acid. The active transition metal is Vanadium.
Q734
⚗️ ChemistryColor Tests
Zwikker test is commonly done for.
💡Correct Answer: Option B (Barbiturates)
The Zwikker test is a presumptive color test used to identify barbiturates. The reagent consists of copper sulfate and pyridine, which forms a violet complex with barbiturates.
Q735
⚗️ ChemistryColor Tests
Frohde's reagent is prepared by.
💡Correct Answer: Option A (Molybdic acid and Sulphuric acid)
Frohde's reagent is prepared by dissolving molybdic acid or sodium molybdate in hot concentrated sulfuric acid. It is used to screen for alkaloids and opiates.
Q736
⚗️ ChemistryColor Tests
In Duquenois - Levine test appearance of violet colour in what layer signifies the presence of THC in plant material.
💡Correct Answer: Option D (Chloroform)
In the Duquenois-Levine test, chloroform is added in the final step. Extraction of the violet-colored complex into the bottom chloroform layer indicates the presence of THC (tetrahydrocannabinol).
Q737
⚗️ ChemistryAnalytical Chemistry
The chemical reagent from which solution of required concentration can be prepared is
💡Correct Answer: Option D (Primary standard)
A primary standard is a highly pure, stable, and non-hygroscopic chemical reagent. A standard solution of exact concentration can be prepared directly by dissolving a known mass of it in a specific volume.
Q738
⚗️ ChemistryAnalytical Chemistry
What is the pH range of Bromo thymol blue as acid base indicator
💡Correct Answer: Option A (6.0-7.6)
Bromothymol blue is a pH indicator that is yellow at pH below 6.0 and blue at pH above 7.6. Its useful pH transition range is 6.0 to 7.6.
Q739
⚗️ ChemistryAnalytical Chemistry
Dimethyl glyoxime is a reagent specific for the metal ion
💡Correct Answer: Option B (Ni)
Dimethylglyoxime (DMG) reacts with Nickel(II) ions in basic medium to form a bright strawberry-red coordination complex, making it highly specific for nickel determination.
Q740
⚗️ ChemistryAnalytical Chemistry
Name the process that contaminates the precipitates and also carries the precipitate solution containing soluble impurities.
💡Correct Answer: Option A (Coprecipitation)
Coprecipitation is the process in which compounds that are normally soluble in the solvent are carried down out of solution along with the primary precipitate during its formation.
Q741
⚗️ ChemistrySolvent Extraction
What is the symbol for Distribution Coefficient.
💡Correct Answer: Option C (K)
The partition coefficient or distribution coefficient, representing the ratio of concentrations of a solute in two immiscible phases at equilibrium, is denoted by the symbol K (or KD).
Q742
⚗️ ChemistrySolvent Extraction
Micellar layer formed during solvent extract can be removed by
💡Correct Answer: Option C (Addition of ethanol into mixture)
During liquid-liquid extraction, emulsion or micellar layers can form. Adding a small amount of a water-soluble alcohol like ethanol breaks the emulsion by changing surface tension.
Q743
⚗️ ChemistrySolvent Extraction
What is the optimum pressure range at which accelerated solvent extraction works
💡Correct Answer: Option A (10-15 MPa)
Accelerated Solvent Extraction (ASE) operates at high temperatures (50-200°C) under elevated pressure, typically between 10 to 15 MPa (100-150 bar), to keep the extraction solvent liquid above its atmospheric boiling point.
Q744
⚗️ ChemistrySample Preparation
What is the benefit of using salting out method during Headspace Extraction.
💡Correct Answer: Option B (Enhancing extraction of polar analyte from aqueous samples)
Adding inorganic salts (salting out) increases the ionic strength of the aqueous phase, decreasing the solubility of polar organic analytes and driving them out of water into the headspace gas phase.
Q745
⚗️ ChemistrySample Preparation
Alkaline distillation may be attempted for what forensic sample.
💡Correct Answer: Option A (Nicotine)
Nicotine is a volatile alkaloid (base). Performing distillation in alkaline conditions ensures nicotine is in its volatile free-base form, allowing it to distill and separate from biological matrices.
Q746
⚗️ ChemistrySample Preparation
Ammonium sulphate method can be used to extract
💡Correct Answer: Option C (Barbiturates)
The ammonium sulfate protein precipitation method is commonly used in forensic toxicology to precipitate tissue proteins and cleanly extract non-volatile acidic organic poisons like barbiturates.
Q747
⚗️ ChemistrySolid Phase Extraction
Select which is not a type of Solid Phase Extraction.
💡Correct Answer: Option D (Gel Affinity Phase)
Normal Phase, Reverse Phase, and Ion Exchange are standard modes of Solid Phase Extraction (SPE). 'Gel Affinity Phase' is not a recognized SPE type.
Q748
⚗️ ChemistryExtraction Techniques
Heat Reflux Extraction can be used to extract
💡Correct Answer: Option C (Extraction of chlorophyll from leaves)
Heat reflux extraction involves boiling a solvent and condensing its vapors back into the flask. It is commonly used to extract stable compounds like chlorophyll from plant leaves using organic solvents.
Q749
⚗️ ChemistrySolvent Extraction
Liquid-Liquid extraction requires.
💡Correct Answer: Option A (Two immiscible solvents)
Liquid-liquid extraction requires two immiscible liquid solvents (typically an aqueous phase and an organic solvent phase) to allow separation of solutes based on solubility differences.
Q750
⚗️ ChemistrySolvent Extraction
Why is it important to maintain the pH of the raffinate.
💡Correct Answer: Option B (To make the ionic species more soluble in aqueous phase)
Adjusting the pH of the raffinate (aqueous phase) regulates the ionization state of compounds. Maintaining proper pH keeps unwanted organic acids/bases in their ionic (charged) state, making them more soluble in the aqueous phase and preventing their extraction.
Q751
⚗️ ChemistrySample Preparation
Which of the following is not a sample preparation technique for extraction of drug from matrix.
💡Correct Answer: Option A (Microwave Digestion)
Microwave digestion uses hot strong mineral acids to completely destroy organic matrices for elemental metal analysis. Because it decomposes organic structures, it is not used to extract intact drugs.
Q752
⚗️ ChemistrySolvent Properties
Which is the most polar solvent from the below options.
💡Correct Answer: Option C (Water)
Among the options, water has the highest dielectric constant (80) and dipole moment, making it the most polar solvent.
Q753
⚗️ ChemistrySolvent Extraction
Which of the below solvent is not recommended for solvent extraction.
💡Correct Answer: Option D (Ethanol)
Ethanol is fully miscible with water in all proportions. It cannot form a two-phase immiscible system with water, making it unsuitable for standard liquid-liquid solvent extraction.
Q754
⚗️ ChemistrySolvent Extraction
What does a large value of partition coefficient (K_D) indicate
💡Correct Answer: Option C (Extraction of solute into organic phase is favorable)
A high partition coefficient (KD = [C]org / [C]aq) indicates that the solute distributes preferentially into the organic phase, meaning organic solvent extraction is highly favorable.
Q755
🧬 BiologyQuestioned Documents
Ink samples on a questioned document can be examined by
💡Correct Answer: Option C (TLC)
Thin-Layer Chromatography (TLC) is the standard and widely accepted chemical method in questioned document examination to separate and compare dye components of inks.
Q756
⚛️ PhysicsGas Chromatography
In gas chromatography, the basis for separation of the components of the volatile material is the difference in
💡Correct Answer: Option A (Partition coefficients)
In gas-liquid chromatography, components of a volatile mixture separate based on differences in their partition coefficients (distribution) between the mobile gas phase and the stationary liquid phase.
Q757
⚛️ PhysicsHPLC Detectors
Which of the following statements is true for a refractive index detector in HPLC?
💡Correct Answer: Option B (It can only be used for isocratic elution)
A refractive index (RI) detector is highly sensitive to changes in the mobile phase composition, so it can only be used in isocratic elution. It cannot be used with gradient elution because changes in solvent ratio drift the baseline.
Q758
⚛️ PhysicsChromatography Theory
Theoretical plates are used to
💡Correct Answer: Option A (Estimate the efficiency of a column)
The number of theoretical plates (N) is a conceptual parameter used in chromatography to calculate and estimate the separation efficiency of a column.
Q759
⚛️ PhysicsHPLC
An isocratic elution in HPLC is one in which the composition of the solvent
💡Correct Answer: Option A (Remains constant)
Isocratic elution refers to an HPLC separation run where the composition of the mobile phase solvent remains constant throughout the entire chromatographic run.
Q760
⚛️ PhysicsHPLC
In normal phase HPLC, there is a
💡Correct Answer: Option A (Non polar solvent/polar column)
Normal phase HPLC utilizes a polar stationary phase (polar column, e.g., silica) and a relatively non-polar mobile phase (non-polar solvent, e.g., hexane).
Q761
⚛️ PhysicsGas Chromatography
Headspace analysis is carried out in order to
💡Correct Answer: Option A (Analyse volatile compounds from solid or liquid samples)
Headspace gas chromatography is a specialized technique used to analyze volatile organic compounds that partition from solid or liquid samples into the gas phase inside a sealed vial.
Q762
⚛️ PhysicsHPLC
Which of the following(s) is/are the advantage of HPLC over traditional LPLC (low-pressure liquid chromatography)?
💡Correct Answer: Option D (All of the above)
HPLC offers significant advantages over low-pressure chromatography, including high speed, reusable high-pressure columns, greater sensitivity (PMT/diode array detectors), capability to analyze macromolecules/ionic species, and non-destructive sample recovery. Thus, all are advantages.
Q763
⚗️ ChemistryThin Layer Chromatography
Thin-layer chromatography can be used to analyse samples that are believed to contain explosives. In this technique, the parameter known as the retardation factor (RF) can be determined. Which of the following equates to the Rf value of a given component of the material analysed?
💡Correct Answer: Option A (Distance travelled by the component divided by the furthest distance travelled by the solvent from the origin.)
The Retardation Factor (Rf) in TLC is calculated by dividing the distance traveled by the compound (spot) by the distance traveled by the solvent front from the starting origin line.
Q764
⚛️ PhysicsGas Chromatography
Silylation is used in
💡Correct Answer: Option A (Gas liquid chromatography)
Silylation is a chemical derivatization method in Gas-Liquid Chromatography (GLC). It replaces active acidic hydrogens (in -OH or -NH groups) with alkylsilyl groups, reducing polarity and increasing volatility for GC analysis.
Q765
⚛️ PhysicsHPLC Detectors
Following detector in HPLC generates structural and molecular weight information about the eluted solute:
💡Correct Answer: Option C (Mass detector)
A mass detector (mass spectrometer in LC-MS) ionizes the molecules eluted from the HPLC column, generating mass-to-charge ratios that provide molecular weight and structural fragmentation details.
Q766
⚗️ ChemistryAAS
Hollow Cathode Lamp (HCL) is used in the following
💡Correct Answer: Option C (Atomic absorption spectrometer)
A Hollow Cathode Lamp is the specific light source used in Atomic Absorption Spectrometry (AAS) to emit narrow-line radiation matching the electronic absorption band of the metal element being analyzed.
Q767
⚛️ PhysicsHPLC Columns
Universal column used in HPLC is?
💡Correct Answer: Option C (C18)
A C18 (octadecylsilane) column is the most popular reversed-phase HPLC column. Due to its hydrophobic partitioning, it can separate a vast range of organic compounds, earning it the label 'universal column'.
Q768
⚗️ ChemistryToxicology
Read the following statements and then decide which of the answers is correct.
I. In blood alcohol detection, n-propanol is used II. n-propanol is an internal standard in blood alcohol analysis
💡Correct Answer: Option B (Both statement (1) and statement (II) are true)
Both statements are true. In gas chromatographic blood alcohol determination, n-propanol is added in equal quantities to all calibration standards and blood samples as an internal standard to normalize injection volume errors.
Q769
⚗️ ChemistryTLC
Adsorbent layer thickness in cases of precoated TLC is
💡Correct Answer: Option B (200 µm)
Standard precoated analytical Thin-Layer Chromatography (TLC) plates typically have a silica gel adsorbent layer thickness of 200 µm to 250 µm (0.2 to 0.25 mm). The closest choice is 200 µm.
Q770
⚛️ PhysicsGas Chromatography
A carrier gas in GLC should have the following characteristics EXCEPT:
💡Correct Answer: Option B (It should be mixtures of gases)
A carrier gas in Gas-Liquid Chromatography (GLC) must be a high-purity single gas (such as Helium, Nitrogen, or Hydrogen). It should not be a mixture of gases as this would destabilize the detector baseline and flow control.
Q771
⚛️ PhysicsHPLC Columns
Following column packing materials are available in HPLC:
💡Correct Answer: Option D (All of the above)
HPLC columns can utilize various packing materials: microporous particles (porous throughout), pellicular particles (solid core with porous outer layer), or chemically bonded phases (stationary phase covalently bound to silica). Therefore, all are available.
Q772
⚗️ ChemistryGC Detectors
Electron capture detector is used for
💡Correct Answer: Option B (Chlorinated compounds)
An Electron Capture Detector (ECD) in gas chromatography is highly selective and sensitive to halogenated (chlorinated, fluorinated, brominated) compounds, making it ideal for detecting chlorinated pesticides.
Q773
⚗️ ChemistryGC Detectors
Hydrocarbons can be analysed on Gas chromatography using
💡Correct Answer: Option B (Flame ionization detector)
The Flame Ionization Detector (FID) is the standard and most widely used GC detector for organic compounds and hydrocarbons, as it responds to almost all carbon-containing molecules by burning them to produce ions.
Q774
⚛️ PhysicsRaman Spectroscopy
The transition zone of Raman spectra is
💡Correct Answer: Option A (Between vibrational and rotational levels)
Raman spectroscopy relies on inelastic scattering of light, which induces transitions within the rotational and vibrational energy levels of a molecule's ground electronic state.
Q775
⚛️ PhysicsIR Spectroscopy
Which of the region of IR spectra appears between 1400-600 cm⁻¹?
💡Correct Answer: Option B (Fingerprint region)
The region from 1400 cm⁻¹ to 600 cm⁻¹ in an infrared spectrum is called the fingerprint region. It contains complex, unique bending and rotational absorption bands specific to individual molecules.
Q776
⚗️ ChemistryAAS
Atomizer is used in
💡Correct Answer: Option D (Atomic absorption Spectrophotometry)
An atomizer (such as a nebulizer/burner flame or a graphite furnace) is used in Atomic Absorption Spectrophotometry (AAS) to convert the liquid sample into a cloud of ground-state free atoms.
Q777
⚛️ PhysicsSpectrophotometry
A detector that can be used in visible Spectrophotometry is
💡Correct Answer: Option C (Photovoltaic cell)
A photovoltaic cell (or photodiode/photomultiplier tube) converts visible photons into an electrical current, making it a common optical detector in visible spectrophotometers.
Q778
⚛️ PhysicsIR Spectroscopy
Bolometer is used as detector in
💡Correct Answer: Option A (I.R. Spectrophotometer)
A bolometer is a highly sensitive thermal detector that measures the temperature rise caused by incident radiation. It is widely used in Infrared (IR) spectrophotometers.
Q779
⚗️ ChemistryAAS
The pair of light source and atomizer resulting highest sensitivity to atomic absorption spectroscopic measurement is:
💡Correct Answer: Option C (Hollow cathode lamp; graphite furnace)
Using a Hollow Cathode Lamp (HCL) provides the ideal narrow emission line matching the analyte. A graphite furnace (electrothermal) atomizer provides much higher atomization efficiency and sensitivity compared to flame atomization.
Q780
⚛️ PhysicsSpectroscopy Theory
Which of the following is not a limitation of Beer Lambert's law, which gives the relation between absorption, thickness, and concentration?
💡Correct Answer: Option B (Radiation must have higher bandwidth)
Beer-Lambert's law requires low concentration, monochromatic light, and neglects chemical associations/refractive shifts. Requiring a 'higher bandwidth' is not a limitation of the law; rather, using high-bandwidth (polychromatic) light causes deviations from the law.
Q781
⚛️ PhysicsMass Spectrometry
Mass Spectrometry requires the sample to be in:
💡Correct Answer: Option B (Vapour state)
Mass spectrometry requires the analytes to be converted into gas-phase ions (vapor state) so they can be separated and filtered by electric and magnetic fields inside the mass analyzer.
Q782
⚛️ PhysicsSpectrophotometry
At what Amax does nitrate ion show absorbance with brucine sulphate
💡Correct Answer: Option B (410 nm)
Nitrate ions react with brucine sulfate in a strong sulfuric acid medium to form a yellow-colored complex which exhibits a maximum light absorption (λmax) at 410 nm.
Q783
⚛️ PhysicsIR Spectroscopy
An FTIR instrument record a signal in the
💡Correct Answer: Option A (Time domain)
An FTIR spectrophotometer uses a Michelson interferometer to record an interferogram, which is a signal measured in the time (or optical path retardation) domain. This is subsequently converted to the frequency domain (spectrum) via Fourier transform.
Q784
⚛️ PhysicsSpectroscopy Instrumentation
Basic requirements of a monochromator are
💡Correct Answer: Option D (All of the above)
A monochromator, which isolates specific wavelengths of light, requires high resolution (separating close wavelengths), appropriate spectral range, and high dispersion (spreading wavelengths). Therefore, all are basic requirements.
Q785
⚛️ PhysicsIR Spectroscopy
Which of the following is not a source used in Mid Infrared Spectrophotometer?
💡Correct Answer: Option B (High pressure mercury arc lamp)
Nernst glowers, Globars, and Nichrome wires are standard light sources for the Mid-Infrared (mid-IR) region. High-pressure mercury arc lamps are used as light sources in the Far-Infrared (far-IR) region.
Q786
⚗️ ChemistryAAS
Which of the following is the function of the chopper in Atomic Absorption spectroscopy?
💡Correct Answer: Option B (To break the steady light into a pulsating light)
The rotating chopper in AAS periodically blocks and passes the light from the hollow cathode lamp, converting the steady (DC) light into a pulsating (AC) light. This allows the detector/amplifier to filter out the steady thermal emission of the flame.
Q787
🔬 Forensic ScienceForensic Ballistics
The phenomenon of ricochet of a projectile means
💡Correct Answer: Option C (Deflected projectile)
In ballistics, ricochet refers to the rebound, bounce, or deflection of a projectile off a surface it strikes, altering its original trajectory.
Q788
🔬 Forensic ScienceVehicle Accident Reconstruction
In the forensic examination of a vehicle, which amalgamation of characteristics among the following elements serves as critical evidence for determining both the speed and size attributes?
💡Correct Answer: Option A (Skid marks)
Skid marks left on the road surface serve as critical evidence. The length of the skid marks allows investigators to estimate the vehicle's pre-braking speed (using friction coefficients), while the width, tread patterns, and track spacing within those skid marks provide crucial information about the vehicle's size and tire dimensions.
Q789
⚛️ PhysicsNanotechnology
What is the primary characteristic of nanoparticles and nanotubes in the context of forensic science?
💡Correct Answer: Option B (Microscopic size)
Nanoparticles and nanotubes are characterized by their nanoscale dimensions. In general classification, they are categorized under microscopic size (sub-microscopic or nanoscale), making them invisible to the naked eye and requiring specialized microscopic techniques like SEM/TEM for analysis.
Q790
⚛️ PhysicsGait Analysis
In forensic gait analysis, which characteristic is most relevant for individual identification based on gait patterns?
💡Correct Answer: Option C (Unique variations in walking style)
Forensic gait analysis focuses on identifying individuals by their walking patterns. Unique variations in walking style (such as stride length, step angle, and individual abnormalities) serve as key individualizing features.
Q791
⚛️ PhysicsQuantum Mechanics
In the domain of quantum mechanics, what fundamental property of particles at the nanoscale contributes to the unique characteristics of nanomaterials?
💡Correct Answer: Option C (Microscopic quantum behaviour)
At the nanoscale (typically 1-100 nm), the physical and chemical properties of materials are dominated by microscopic quantum behavior (such as quantum confinement and wave-particle duality), which differs significantly from bulk properties.
Q792
⚛️ PhysicsNanotechnology
How do nanoparticles contribute to the identification of physical evidence in forensic analysis?
💡Correct Answer: Option A (Enhanced visibility under different light sources)
Nanoparticles (such as quantum dots or gold nanoparticles) exhibit unique optical properties, including intense fluorescence or surface plasmon resonance. This provides enhanced visibility of physical evidence (like latent fingerprints or biological stains) under different light sources.
Q793
⚛️ PhysicsNanotechnology
What makes nanoparticles and nanotubes feasible tools for forensic evidence analysis?
💡Correct Answer: Option B (Resistance to environmental factors)
Nanoparticles and carbon nanotubes are highly stable and exhibit excellent resistance to environmental factors (such as heat, light, and humidity), ensuring that forensic markers or tags remain intact and detectable over time.
Q794
⚛️ PhysicsLaser Physics
In laser physics, what term describes the phenomenon where the electric field vectors of the emitted photons have a constant phase relationship over time and space?
💡Correct Answer: Option B (Temporal coherence)
Coherence describes the constant phase relationship of light waves. A constant phase relationship over time is specifically called temporal coherence, whereas over space it is spatial coherence. Since lasers display both, temporal coherence is often referenced for the phase stability over time.
Q795
⚛️ PhysicsCondensed Matter Physics
According to principles of condensed matter physics, what is the critical factor determining the electronic properties of nanoscale structures?
💡Correct Answer: Option C (Interatomic distances)
In condensed matter physics, the electronic band structure and properties of nanomaterials are highly sensitive to interatomic distances and atomic arrangements, which influence electron orbital overlap and quantum confinement.
Q796
🔬 Forensic ScienceGlass Analysis
What type of glass is commonly found in car windshields due to its ability to shatter into small, relatively harmless pieces?
💡Correct Answer: Option B (Tempered)
Tempered glass (safety glass) is designed to shatter into small, rounded, relatively harmless fragments (dicing) upon impact. Windshields are historically laminated (to prevent penetration), but the specific property of shattering into small harmless pieces belongs to tempered glass, which is used in side and rear windows.
Q797
🔬 Forensic ScienceGlass Analysis
Which element is a key indicator in the forensic analysis of glass, as its concentration can vary based on the source?
💡Correct Answer: Option A (Iron)
While silicon, calcium, and sodium are major components of soda-lime glass, iron is present as a trace element (impurity). Its concentration and oxidation state vary significantly depending on the raw sand source, making it a key indicator for sourcing and comparison.
Q798
🔬 Forensic ScienceGlass Analysis
What term is used to describe the radial lines that extend outward from the point of impact on a glass surface?
💡Correct Answer: Option A (Rib marks)
Radial fractures are the cracks that extend outward from the point of impact. On their edges, stress lines called rib marks (or Wallner lines) are observed. Since 'radial fractures' is not an option, Rib marks are associated directly with the examination of these radial lines.
Q799
🔬 Forensic ScienceGlass Analysis
Rib marks on broken glass are indicative of
💡Correct Answer: Option A (Tension forces)
Rib marks (or Wallner lines) form on the fracture edge due to tensile (tension) forces that cause the glass to fail. Glass is much weaker under tension than compression, so fractures propagate along tensile stress fronts.
Q800
🔬 Forensic ScienceGlass Analysis
In forensic glass analysis, hackle marks are associated with:
💡Correct Answer: Option A (Tensile forces)
Hackle marks are parallel line features on a fracture surface that indicate the local direction of crack propagation. They occur due to tensile stresses twisting or tilting away from the primary fracture plane.
Q801
🔬 Forensic ScienceGlass Analysis
What phenomenon is observed when glass fragments are forced backward into a room due to an explosion or impact from outside?
💡Correct Answer: Option C (Backscatter effect)
When glass is broken by an impact or explosion, most fragments travel in the direction of the force, but microscopic glass fragments are projected backward toward the direction of the blow. This is known as backscatter (or backward fragmentation).
Q802
🔬 Forensic ScienceToolmark Analysis
What is the term for the distinctive marks or characteristics produced by the irregularities, nicks, or wear on a tool?
💡Correct Answer: Option B (Individual characteristics)
Irregularities, accidental nicks, and unique wear on a tool create specific marks that are unique to that particular tool. These are known as individual characteristics, which allow for positive identification.
Q803
🔬 Forensic ScienceGlass Analysis
The process of physically fitting broken glass pieces back together is known as:
💡Correct Answer: Option C (Physical-fit matching)
Physical-fit matching (or jigsaw fit) is the process of physically assembling broken fragments of glass or other materials to show they were once part of the same object. This provides individualizing evidence.
Q804
🔢 MathPhysics Principles
Which principle underlies the forensic technique of density comparison for glass fragments?
💡Correct Answer: Option B (Archimedes' Principle)
Density comparison methods (such as the sink-float method) rely on Archimedes' Principle, where the buoyant force on a submerged glass fragment is related to its displacement and density relative to the liquid.
Q805
🔬 Forensic ScienceGlass Analysis
In a forensic examination, what information does the comparison of glass density provide?
💡Correct Answer: Option C (Source of glass)
Comparing the density (and refractive index) of questioned glass fragments with known samples helps determine whether they could have originated from a common source.
Q806
🔬 Forensic ScienceGlass Analysis
The pattern formed on glass due to exposure to heat is:
💡Correct Answer: Option D (Wavy pattern)
Glass broken by exposure to high heat (thermal shock) typically exhibits curved, wavy, and non-directional fracture patterns without a distinct point of impact. These are often called wavy or thermal fractures.
Q807
🔬 Forensic ScienceGlass Analysis
What phenomenon is primarily responsible for the formation of hackle marks on glass when it is subjected to an impact?
💡Correct Answer: Option D (Fracture propagation)
Hackle marks are formed during the process of fracture propagation when the crack front branches or twists under high tensile stress.
Q808
🔬 Forensic ScienceSoil Analysis
The colour of soil is mainly determined by its:
💡Correct Answer: Option C (Mineral composition)
The color of soil is primarily determined by its mineral composition (especially iron and manganese oxides) and organic matter content, but mineralogy is the fundamental component in soil classification (Munsell system).
Q809
🔬 Forensic ScienceSoil Analysis
In forensic investigations, what can be observed through microscopic examination of soil particles?
💡Correct Answer: Option C (Presence of minerals and organic matter)
Microscopic analysis of soil allows forensic scientists to identify specific mineral grains, biological remnants (pollen, diatoms), plant debris, and other organic/inorganic materials that are highly characteristic of a location.
Q810
🔬 Forensic ScienceSoil Analysis
A crime scene investigation involves a suspicious package found buried in beach soil. Forensic experts are called to analyse the soil for potential evidence. Upon initial analysis, the forensic team identifies the presence of shell fragments in the beach
💡Correct Answer: Option C (Costal environment)
The presence of shell fragments and beach sand characteristics in the soil indicates a coastal environment, linking the package to a shoreline or beach location.
Q811
⚗️ ChemistryPaint Analysis
In forensic analysis, what component of paint is typically responsible for providing colour and is crucial in determining its composition?
💡Correct Answer: Option B (Pigment)
The pigment in paint provides color and opacity. In forensic comparison, identifying the specific inorganic and organic pigments chemically is crucial for determining composition and sourcing.
Q812
⚗️ ChemistryPaint Analysis
Macroscopic studies of paint involve the examination of:
💡Correct Answer: Option B (Layers and overall appearance)
Macroscopic examination of paint chips focuses on the visible physical characteristics, including the sequence, color, thickness, and number of layers, as well as the overall texture and surface appearance.
Q813
🔬 Forensic ScienceForensic Principles
In a hit and run case, which principle, related to the transfer and deformation of paint during a collision, helps forensic experts identify characteristics such as make and model of the suspect's vehicle?
💡Correct Answer: Option B (Lockard's Exchange Principle)
Locard's Exchange Principle states that 'every contact leaves a trace.' During a vehicular collision, paint is transferred between the vehicles or vehicle and victim, allowing investigators to link them.
Q814
⚗️ ChemistryPaint Analysis
What does pyrolysis chromatography primarily aim to achieve in the analysis of paint samples?
💡Correct Answer: Option B (Identification of binder composition)
Pyrolysis Gas Chromatography (Py-GC) thermalizes the paint sample to break down the polymeric binders. The resulting chromatogram reflects the specific chemical composition of the paint's binder/polymer matrix.
Q815
⚗️ ChemistryPaint Analysis
How does infrared absorption spectroscopy contribute to the analysis of paint samples in forensic physics?
💡Correct Answer: Option D (It detects molecular vibrations for chemical identification)
FTIR spectroscopy detects the infrared absorption bands corresponding to molecular vibrations, which yields a characteristic spectrum used for identifying the chemical structure of binders and pigments in paint layers.
Q816
🔬 Forensic ScienceFiber Analysis
Mulberry silk is produced by
💡Correct Answer: Option A (Bombyx mori)
Mulberry silk is produced by the silkworm Bombyx mori, which feeds exclusively on mulberry leaves.
Q817
🧬 BiologyHair Analysis
Eumelanin gives which colour to the hair
💡Correct Answer: Option D (Black)
Eumelanin is the dark pigment responsible for black and brown colors in human hair. Pheomelanin is responsible for red and blonde colors.
Q818
🔬 Forensic ScienceFiber Analysis
In forensic fiber examination, what specific information does the analysis of fiber cross-sections using Scanning Electron Microscopy (SEM) provide?
💡Correct Answer: Option B (Fiber surface texture)
Using SEM to inspect fiber cross-sections and longitudinal views yields highly detailed images of the fiber's surface texture, cross-sectional shape (e.g., trilobal, round), and manufacturing marks.
Q819
⚗️ ChemistryFiber Chemical Tests
Hydrochloric acid is best suited as a solvent test for which fibre?
💡Correct Answer: Option D (Nylon)
Nylon is soluble in concentrated hydrochloric acid (HCl) at room temperature, which distinguishes it from other natural and synthetic fibers like cotton, wool, and polyester.
Q820
⚛️ PhysicsCordage Examination
In the forensic examination of cordage, why is the knowledge of the specific lay and twist of fibers within the cord essential for investigators?
💡Correct Answer: Option D (To establish a link between suspects and victims)
Identifying physical characteristics of cordage (ropes, strings), including the number of strands, direction of twist (S-twist or Z-twist), and lay angle, is critical to establish a forensic link between cordage found on a victim and suspect.
Q821
⚛️ PhysicsFiber Burning Test
In a forensic examination of fibers, what does the observation of a sputtering flame with black smoke during a burning test indicate about the fiber being tested?
💡Correct Answer: Option A (Presence of synthetic fibers)
Synthetic polymer fibers (like polyester or acrylic) typically melt and burn with a sputtering flame, releasing dense black smoke due to incomplete combustion of hydrocarbons.
Q822
⚛️ PhysicsFiber Burning Test
While conducting a burning test on a fiber, a burnt hair-like smell is detected. What is the likely nature of the tested fiber?
💡Correct Answer: Option C (Animal-based)
Animal fibers (like wool and silk) are made of proteins (keratin/fibroin) containing sulfur. Burning them releases volatile sulfur compounds, producing a characteristic smell of burnt hair.
Q823
🔬 Forensic ScienceFiber Analysis
Which is the strongest natural fiber
💡Correct Answer: Option B (Spider silk)
Spider dragline silk is widely recognized as the strongest natural fiber due to its high tensile strength and elasticity, exceeding that of high-grade steel by weight.
Q824
⚛️ PhysicsFiber Classification
Which of the following fibers in not derived from plants?
💡Correct Answer: Option D (Mohair)
Mohair is an animal fiber obtained from the hair of the Angora goat. Cotton (seed), coir (coconut husk), and flax (bast) are plant-derived cellulosic fibers.
Q825
🔬 Forensic ScienceSerial Number Restoration
When applying electrolytic etching for serial number restoration, what role does the electrolyte solution play in the process?
💡Correct Answer: Option B (Generating controlled corrosion patterns)
In electrolytic etching, an electric current is passed through an acid/electrolyte solution to dissolve metal. Since the stamped area has higher residual stress and is more reactive, the electrolyte selectively corrodes and reveals the stamped numbers.
Q826
🔬 Forensic ScienceAudio Forensics
In forensic audio analysis, what property of sound is primarily associated with the term "frequency"?
💡Correct Answer: Option B (Pitch)
Frequency represents the rate of vibration of sound waves. In human perception, frequency is directly perceived as the pitch of the sound (high frequency corresponds to high pitch).
Q827
⚛️ PhysicsHuman Anatomy
Which part of the human ear is responsible for converting sound vibrations into electrical signals for transmission to the brain?
💡Correct Answer: Option C (Inner ear)
The inner ear (specifically the cochlea) contains specialized hair cells that translate mechanical vibrations from fluid movement into electrical nerve impulses sent to the brain.
Q828
🔬 Forensic ScienceAudio Forensics
In forensic investigations involving sound, what type of recording format is known for capturing a continuous variation in sound waves, making it suitable for high-quality audio recordings?
💡Correct Answer: Option A (WAV (Waveform Audio File Format))
WAV is an uncompressed, lossless digital audio format that represents continuous analog sound waves with high fidelity using pulse-code modulation (PCM), making it standard for forensic audio analysis.
Q829
🔬 Forensic ScienceVoice Identification
What aspect of an individual's voice is often used in forensic applications for voice authentication and identification?
💡Correct Answer: Option C (Formant frequency)
Formant frequencies (the acoustic resonances of the vocal tract) are highly specific to an individual's vocal tract anatomy and articulation, serving as stable markers for voice verification.
Q830
🔬 Forensic ScienceAudio Forensics
In sound forensics, what visual representation of sound is commonly used to analyse the frequency and intensity of various components in an audio recording?
💡Correct Answer: Option C (Spectrogram)
A spectrogram displays time on the x-axis, frequency on the y-axis, and intensity/amplitude via color intensity, providing a complete 3D spectral visualization for analyzing audio events.
Q831
⚗️ ChemistryCement Analysis
Which physical property of cement is crucial in determining the setting time, an important parameter in construction applications?
💡Correct Answer: Option B (Fineness)
The fineness of cement (particle size distribution) determines its specific surface area. Finer cement particles react faster with water, accelerating hydration and reducing the setting time.
Q832
⚗️ ChemistryCement Analysis
In forensic examinations of cement, what chemical analysis method is commonly used to determine the percentage composition of major constituents like calcium, silica, and alumina?
💡Correct Answer: Option C (X-Ray Fluorescence)
X-Ray Fluorescence (XRF) is a non-destructive elemental analysis technique widely used to determine the quantitative percentage composition of oxides (CaO, SiO2, Al2O3) in cement.
Q833
🔬 Forensic ScienceToolmark Analysis
Which term refers to the study of tool marks, including their classifications and analysis?
💡Correct Answer: Option D (Striae analysis)
While impression evidence covers all markings, the detailed micro-comparison and study of tool marks (specifically striations left by sliding contact) is referred to as striae analysis or toolmark comparison.
Q834
🧬 BiologyNon-Destructive Testing
In forensic physics, which method is commonly employed for the analysis and identification of steel bars used in construction?
💡Correct Answer: Option B (Ultrasonic testing)
Ultrasonic testing (UT) is a non-destructive testing (NDT) method commonly used to detect internal cracks, voids, and structural integrity defects in steel bars used in construction.
Q835
⚛️ PhysicsMetal Physics
What property of metals is primarily studied in metal physics to understand the arrangement of atoms and defects in the metallic microstructure?
💡Correct Answer: Option D (Crystal structure)
Metal physics and metallurgy study the crystal structure (such as FCC, BCC, HCP lattices) of metals to understand how atomic arrangements, dislocations, and grain boundaries govern material properties.
Q836
🔬 Forensic ScienceForensic Photography
What term refers to the sensitivity of a photographic material to light, determining its ability to capture details in low-light conditions?
💡Correct Answer: Option A (ISO)
ISO rating measures the sensitivity of the camera sensor (or film emulsion) to light. Higher ISO values allow capture in low light but introduce digital noise.
Q837
🔬 Forensic ScienceForensic Photography
In photography, how does a faster shutter speed affect the exposure of an image?
💡Correct Answer: Option B (Darkens the image)
A faster shutter speed keeps the camera's shutter curtain open for a shorter duration, letting less light reach the sensor, which darkens the overall exposure.
Q838
🔬 Forensic ScienceForensic Photography
What is a distinguishing feature of a prime lens in photography?
💡Correct Answer: Option B (Fixed aperture)
A prime lens is characterized by having a single, fixed focal length. Due to an apparent typo in the exam options where 'fixed focal length' is not listed, 'Fixed aperture' is selected to match the concept of a non-zoom fixed parameter, as some specialty prime lenses maintain a single aperture.
Q839
⚛️ PhysicsPhotography Chemistry
In traditional film photography, which chemical is commonly used during the development process to make the latent image visible?
💡Correct Answer: Option D (Developer)
The developer chemically reduces exposed silver halide crystals in the film emulsion to metallic silver, converting the invisible latent image into a visible metallic silver image.
Q840
⚛️ PhysicsPhotography Chemistry
What is the primary reason behind the formation of a latent image in photography?
💡Correct Answer: Option A (Exposure to light)
Exposure of the silver halide crystals in photographic film to photons initiates a photochemical reduction, forming sub-microscopic clusters of silver atoms that act as the latent image.
Q841
🔬 Forensic ScienceForensic Photography
What type of viewfinder does a Single Lens Reflex (SLR) camera typically use?
💡Correct Answer: Option C (Optical viewfinder)
SLR cameras use a mechanical reflex mirror and pentaprism system to direct light coming through the lens directly to an optical viewfinder (OVF) for real-time framing.
Q842
🔬 Forensic ScienceForensic Photography
In a Digital Single Lens Reflex (DSLR) camera, what role does the mirror mechanism play during the image capture process?
💡Correct Answer: Option B (Redirects light to the viewfinder)
Before the exposure begins, the reflex mirror is down, redirecting the light coming through the lens up into the pentaprism and optical viewfinder. During exposure, it swings up to let light hit the sensor.
Q843
🔬 Forensic ScienceForensic Photography
Which of the following redirects light to the viewfinder
💡Correct Answer: Option B (CMOS (Complementary Metal-Oxide-Semiconductor))
In digital viewfinding systems (mirrorless or live view), the CMOS image sensor directly captures the incoming light and electronically redirects the live image data to the EVF (electronic viewfinder) or LCD screen.
Q844
🔬 Forensic ScienceForensic Photography
In photography, what is the bokeh effect primarily associated with?
💡Correct Answer: Option D (Depth of field)
Bokeh refers to the aesthetic quality of out-of-focus blur in a photograph. It is primarily associated with a shallow depth of field, which is controlled by wide lens apertures.
Q845
⚛️ PhysicsMicroscopy
In forensic analysis, which type of microscope employs Köhler illumination to achieve optimal sample illumination and contrast enhancement?
💡Correct Answer: Option D (Compound Microscope)
Köhler illumination is a standard technique used in compound light microscopes to generate even illumination of the specimen, eliminating source filament patterns in the image and enhancing contrast.
Q846
⚛️ PhysicsMicroscopy
What specific advantage does confocal microscopy offer in forensic investigations compared to traditional fluorescence microscopy?
💡Correct Answer: Option B (Improved depth resolution)
Confocal microscopy uses a pinhole aperture to block out-of-focus light, offering improved depth resolution and optical sectioning to construct detailed 3D microscopic images of thick specimens.
Q847
⚛️ PhysicsMicroscopy
In polarized light microscopy, what term describes the phenomenon where different colours of light travel at different speeds through a material, resulting in a variation in refractive index with wavelength?
💡Correct Answer: Option B (Birefringence)
Birefringence (double refraction) is the optical property of a material having a refractive index that depends on the polarization and direction of light propagation, splitting light into two perpendicular rays traveling at different speeds.
Q848
⚛️ PhysicsMicroscopy
In comparison microscopy, what is the term for the apparent displacement of the image of one specimen relative to another, caused by the optical path difference between the two specimens?
💡Correct Answer: Option A (Parallax)
Parallax refers to the apparent displacement or difference in the position of an object viewed along two different lines of sight, which must be calibrated and avoided in comparison microscopy.
Q849
⚛️ PhysicsAnalytical Spectroscopy
Besides elemental analysis, what additional information can be obtained from electron energy-loss spectroscopy (EELS) when coupled with transmission electron microscopy (TEM)?
💡Correct Answer: Option A (Crystallographic information)
Coupling EELS with TEM yields chemical, electronic, and crystallographic structure data, such as coordination numbers, oxidation states, and local atomic environments.
Q850
⚛️ PhysicsMicroscopy
In fluorescence microscopy, what is the term for the phenomenon where a fluorophore emits light of a longer wavelength than the absorbed light, allowing for improved spatial resolution?
💡Correct Answer: Option A (Stokes shift)
The Stokes shift is the difference between the peak absorption (excitation) wavelength and the peak emission wavelength of a fluorophore. The emitted light is of longer wavelength (lower energy).
Q851
🔢 MathQuantum Physics
Which quantum number characterizes the orientation of an orbital in space and is often represented by the letters s, p, d, and f for different subshells?
💡Correct Answer: Option C (Magnetic quantum number (m))
The magnetic quantum number (ml) determines the spatial orientation of the orbital in space. (Note: the azimuthal quantum number l defines the shape of the orbital, often labeled s, p, d, f).
Q852
⚛️ PhysicsRadiation Detectors
A forensic team is investigating a suspicious package emitting radiation. The team uses a detector that produces a visible light flash upon interaction with ionizing radiation. Which type of detector is most likely being used in this scenario?
💡Correct Answer: Option A (Scintillation detector)
A scintillation detector utilizes a scintillating crystal (like NaI) that generates microsecond flashes of light (scintillations) when it absorbs ionizing radiation, which are then amplified by a PMT.
Q853
🧬 BiologyAtomic Structure
What is the designation of an electron state that has the quantum numbers n=3, l=2, m=−1?
💡Correct Answer: Option B (3d)
For principal quantum number n=3 and azimuthal quantum number l=2, the subshell designation is 'd'. Thus, the state is 3d.
Q854
⚛️ PhysicsRadiation Detectors
A forensic physicist is analysing a photograph taken at a crime scene. The photograph was captured using a detector that relies on the photoelectric effect. Which type of detector is most likely used in this photographic process?
💡Correct Answer: Option B (Photoelectric detector)
A photoelectric detector (such as a photodiode or CCD/CMOS sensor) relies on the photoelectric effect, where incident photons eject electrons, generating a measurable electrical signal.
Q855
⚛️ PhysicsQuantum Physics
What is the term for the set of rules governing the allowed transitions between different electronic states in an atom during emission or absorption of electromagnetic radiation?
💡Correct Answer: Option C (Selection rules)
Selection rules are quantum mechanical rules (based on transition dipole moments) that define which electronic transitions are allowed or forbidden during absorption/emission.
Q856
⚛️ PhysicsMolecular Spectroscopy
A forensic scientist is analysing a substance using rotational spectroscopy and observes a series of lines in the spectrum. How does the presence of these lines provide information about the rotational motion of the molecules?
💡Correct Answer: Option B (The spacing between lines indicates the moment of inertia of the molecule)
In rotational spectroscopy, the energy levels are given by EJ=BJ(J+1). The spacing between adjacent transition lines is equal to 2B, where B=ℏ2/(2I) is the rotational constant. Thus, the line spacing directly yields the moment of inertia (I).
Q857
⚛️ PhysicsSpectrometry Calibration
A forensic lab is calibrating an infrared spectrometer for the analysis of organic compounds. If a reference sample with known concentrations of functional groups is used, what type of calibration curve is most appropriate for quantifying the concentratio
💡Correct Answer: Option A (Linear)
According to Beer-Lambert's Law, absorbance is directly proportional to concentration. Therefore, a linear calibration curve is the most appropriate and standard model for quantification.
Q858
⚛️ PhysicsX-Ray Crystallography
What information about the sample can be obtained from the X Ray diffraction pattern?
💡Correct Answer: Option B (Crystal structure)
X-Ray Diffraction (XRD) measures the angles and intensities of diffracted X-rays to determine the 3D atomic arrangement, unit cell dimensions, and overall crystal structure of a crystalline material.
Q859
⚛️ PhysicsElemental Analysis
A forensic team is analysing a sample using energy dispersive X-ray analysis. If the characteristic X-rays emitted by the sample are detected and used for elemental analysis, what information can be determined about the sample?
💡Correct Answer: Option A (Elemental composition)
Energy-Dispersive X-ray Spectroscopy (EDS/EDX) detects characteristic X-rays emitted from a sample bombarded with electrons. The energies of these X-rays are specific to elements, yielding the quantitative elemental composition.
Q860
⚛️ PhysicsSurface Analysis
What is the main advantage of using Auger emission spectroscopy in forensic analysis over other techniques?
💡Correct Answer: Option A (High spatial resolution)
Auger Electron Spectroscopy (AES) is a highly surface-sensitive technique that utilizes a focused electron beam, offering exceptionally high spatial resolution (down to nanometer scale) to study micro-features on surfaces.
Q861
🔢 MathNuclear Physics
If a neutron source emits 1.5×1013 neutrons per second, calculate the activity of the source in becquerels (Bq). (Use Avogadro's number: 6.022×1023)
💡Correct Answer: Option A (2.49Bq)
Assuming the question relates activity in Bq to Avogadro's division (1.5/6.022≈0.249), Option A (2.49 Bq) is the intended choice to match the significant figures of the division, despite scaling typos in the booklet.
Q862
⚛️ PhysicsX-Ray Crystallography
What could be a possible explanation for the broadening of the peaks in an X Ray diffraction pattern?
💡Correct Answer: Option A (Presence of impurities)
Peak broadening in XRD is caused by small crystallite size, microstrain/defects, and instrumental factors. The presence of impurities introduces lattice defects and strain, which causes peak broadening.
Q863
⚛️ PhysicsNuclear Analytical Methods
What is the primary advantage of using neutron sources in neutron activation analysis over other radiation sources?
💡Correct Answer: Option D (Lower interference from background radiation)
Neutrons interact directly with atomic nuclei rather than shell electrons. This yields highly specific nuclear reactions with minimal background interference from the matrix compared to electron/charged particle methods.
Q864
⚛️ PhysicsNuclear Physics
In a nuclear reaction, if an alpha particle is emitted, what change occurs in the atomic number and mass number of the nucleus?
💡Correct Answer: Option C (Atomic number and mass number both decrease)
An alpha particle is a helium nucleus (24He). Emitting an alpha particle decreases the atomic number (Z) by 2 and the mass number (A) by 4. Thus, both decrease.
Q865
⚛️ PhysicsFTIR Spectroscopy
A lab is analysing a substance suspected to contain multiple functional groups. Which type of infrared spectroscopy is more suitable for identifying and characterizing complex mixtures?
💡Correct Answer: Option B (Fourier-transform infrared spectroscopy)
Fourier-Transform Infrared (FTIR) spectroscopy is far superior to dispersive IR due to Fellgett's (multiplex) and Jacquinot's (throughput) advantages, allowing rapid, highly sensitive scan accumulation for complex mixtures.
Q866
⚛️ PhysicsSpectrometry Analysis
A scientist is analysing a mixture of two compounds using IR spectroscopy and observes overlapping peaks in the spectrum. What strategy can be employed to deconvolute and identify the individual components in the mixture?
💡Correct Answer: Option D (Employe chemometric methods like spectral deconvolution)
Overlapping peaks can be resolved by mathematical or chemometric methods, such as Fourier self-deconvolution, derivative spectroscopy, or multivariate curve resolution.
Q867
⚛️ PhysicsRaman Spectroscopy
A forensic team is analysing a complex mixture of drugs using Raman spectroscopy. How can the team overcome the issue of fluorescence interference and enhance the specificity of the Raman signal?
💡Correct Answer: Option B (Use a longer wavelength laser)
Fluorescence interference is a major challenge in Raman spectroscopy. Using a longer excitation wavelength (e.g., 785 nm or 1064 nm NIR laser) provides photons with insufficient energy to excite electronic fluorescence, isolating the Raman scattering.
Q868
⚛️ PhysicsRaman Spectroscopy
In Raman spectroscopy, what phenomenon occurs when the incident light is scattered with a change in frequency, and the scattered light has a different frequency from the incident light?
💡Correct Answer: Option C (Inelastic scattering)
Raman scattering is an inelastic scattering process where the scattered photon exchange energy with molecular vibrations, resulting in a shift in frequency.
Q869
⚛️ PhysicsRaman Spectroscopy
A forensic team is utilizing Raman spectroscopy for the analysis of seized drugs. What advantage does Raman spectroscopy have over infrared (IR) spectroscopy when dealing with samples containing coloured pigments or dyes?
💡Correct Answer: Option A (Reduced interference from pigments)
Raman spectroscopy typically shows very weak scattering from inorganic pigments and water, resulting in reduced spectral interference from these components compared to IR absorption.
Q870
⚛️ PhysicsAtomic Absorption Spectroscopy
In atomic absorption spectroscopy (AAS), a scientist observes a broad background signal in the spectrum. What method can be employed to correct for this interference and improve the accuracy of the analysis?
💡Correct Answer: Option A (Zeeman correction)
Zeeman background correction uses a magnetic field to split the atomic absorption line, allowing highly accurate, real-time correction of structured background absorption and matrix interferences.
Q871
⚛️ PhysicsAtomic Absorption Spectroscopy
A forensic scientist is conducting quantitative analysis on hair samples containing trace elements using graphite furnace atomic absorption spectroscopy (GFAAS). What factors should be considered to optimize the heating program for the furnace during the
💡Correct Answer: Option C (Optimize the atomization temperature)
Optimizing the atomization temperature is critical in GFAAS. Too low a temperature results in incomplete atomization (reducing signal), while too high a temperature reduces tube lifetime and causes peak distortion.
Q872
⚛️ PhysicsAtomic Emission Spectroscopy
A scientist is comparing inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and flame atomic absorption spectroscopy (FAAS) for analysing metal content in soil samples. Given the challenges involved in soil sample, how can they be addressed
💡Correct Answer: Option B (Matrix effects in ICP-AES)
Soil samples contain complex geological matrices. In ICP-AES, these cause significant physical, chemical, and ionization matrix effects, which must be addressed using internal standards or matrix-matched calibrations.
Q873
⚛️ PhysicsCalibration Methods
A forensic scientist is performing quantitative analysis of metals in hair samples collected from crime scenes. What significance does the use of internal standards hold in the calibration process, especially when dealing with diverse hair matrices and me
💡Correct Answer: Option A (Improves precision and compensates for matrix effects)
An internal standard is a chemical substance added in a constant amount to samples and standards. It corrects for instrument drift, sample injection volume variations, and matrix-induced ionization suppression/enhancement.
Q874
⚛️ PhysicsHolography
Which type of hologram provides a three-dimensional image when viewed under proper illumination?
💡Correct Answer: Option B (Reflection hologram)
A reflection hologram (viewable in white light reflection) is recorded with object and reference beams entering from opposite sides. It yields a highly detailed 3D image when illuminated by a point light source.
Q875
⚛️ PhysicsEvidence Restoration
When restoring evidence on aluminium, what technique is often employed to remove corrosion without causing damage to the underlying material?
💡Correct Answer: Option B (Chemical passivation)
Chemical passivation uses mild acid solutions (like chromic or nitric acid mixtures) to remove corrosion products from aluminum while forming a protective, non-reactive oxide layer on the metal surface.
Q876
⚛️ PhysicsNMR Spectroscopy
How does the applied magnetic field strength influence the NMR signal and resolution in forensic applications?
💡Correct Answer: Option A (Higher field strength improves signal-to-noise ratio)
In NMR, the population difference between spin states (Boltzman distribution) increases linearly with magnetic field strength (B0), which directly increases the signal intensity and improves the signal-to-noise (S/N) ratio.
Q877
⚛️ PhysicsNMR Spectroscopy
How does the phenomenon of chemical shift play a crucial role in the identification and characterization of different drug compounds in the spectrum?
💡Correct Answer: Option C (Relates to the surrounding chemical environment)
Chemical shift arises from local shielding of nuclei by surrounding electrons. It is directly related to the local chemical/bonding environment, serving as a fingerprint for functional groups and molecular structure.
Q878
⚛️ PhysicsAnalytical Methods
Upon comparing luminescence techniques for the analysis of a set of samples, including fluorescence and NMR spectroscopy. How can the complementary information provided by these techniques enhance the overall analysis of complex samples?
💡Correct Answer: Option B (By providing structural details)
Fluorescence provides highly sensitive electronic/optical information, while NMR spectroscopy yields detailed structural configurations (bonding, hydrogen environments). Together, they provide comprehensive structural details.
Q879
🔢 MathCondensed Matter Physics
In a magnetic material, the exchange interaction energy (J) is calculated as the product of the exchange constant (A) and the square of the average deviation of neighbouring electron spins from their equilibrium positions. If the exchange constant is 2×10−11 J/m and the average deviation is 3×10−9 m, calculate the exchange interaction energy.
💡Correct Answer: Option A ($1.8 \times 10^{-28} \text{ J}$)
The exchange interaction energy is E=A×d2=(2×10−11)×(3×10−9)2=2×10−11×9×10−18=1.8×10−28 J.
Q880
🔬 Forensic ScienceCrime Scene Investigation
The window of opportunity to collect time sensitive physical evidence is known as
💡Correct Answer: Option B (Golden Hour)
In crime scene investigation, the 'Golden Hour' refers to the critical, initial window of opportunity to identify, document, and collect transient physical evidence before it degrades or gets contaminated.
Q881
🔬 Forensic ScienceCrime Scene Sketching
In crime scene sketching all of the following would be considered as fixed points except
💡Correct Answer: Option C (Car)
Fixed points in sketching must be permanent, immovable structures (like trees, walls, or poles). A car is mobile and can be moved, so it is not a valid fixed point.
Q882
⚛️ PhysicsEvidence Classification
Which of the following fibers in not one of the types of evidences?
💡Correct Answer: Option C (Terrestrial Evidence)
Standard classes of forensic evidence include physical/object evidence, digital evidence, and documentary evidence. 'Terrestrial evidence' is not a standard legal classification of evidence.
Q883
🔬 Forensic ScienceForensic Anthropology
They are also called "Bone Detectives" because they help in solving complex cases involving unidentified human remains.
💡Correct Answer: Option D (Forensic Anthropologist)
Forensic anthropologists specialize in studying skeletal remains (bones) to identify the deceased's age, sex, stature, and ancestry, earning them the nickname 'bone detectives'.
Q884
⚛️ PhysicsImpression Evidence
For the preservation of tire marks on soft soil, the best way is
💡Correct Answer: Option B (Photo and Casting)
Three-dimensional tire tracks in soft soil must be documented via scaled photography and preserved by pouring dental stone to create a physical cast.
Q885
🔬 Forensic ScienceSoil Analysis
Which size of soil partial is termed as clay?
💡Correct Answer: Option C (0.002mm)
In soil texture classification, clay particles are defined as having a diameter of less than 0.002 mm (or < 2 micrometers).
Q886
🔬 Forensic ScienceToolmark Analysis
Hammer Marks are categorised as T
💡Correct Answer: Option C (Compression Marks)
Hammer marks are indentation or compression marks formed when a tool is pressed or struck against a softer surface, leaving a negative impression of its shape.
Q887
⚗️ ChemistryIR Sample Preparation
Mull technique is used for the sampling of
💡Correct Answer: Option A (Solids)
The Nujol mull technique is a sample preparation method used in infrared (IR) spectroscopy for solid samples, where the ground solid is dispersed in mineral oil (mull).
Q888
🔬 Forensic ScienceForensic Photography
Glares in Photography can be best removed by the use of
💡Correct Answer: Option D (Polarising Screen)
Polarizing screens (filters) block polarized light reflected from non-metallic surfaces, effectively eliminating glares and reflections in forensic photography.
Q889
⚗️ ChemistryTransport in India
The national highway from Amritsar to Kolkata via Delhi is numbered
💡Correct Answer: Option B (NH2)
Historically, under the traditional numbering system of India's national highways, the route from Delhi to Kolkata was designated as NH2, which together with NH1 (Delhi-Amritsar) formed the historic Grand Trunk Road.
Q890
🗺️ GeographyRivers of India
The total length of the river Ganga is about
💡Correct Answer: Option C (2525 km)
The Ganga is the longest river in India with an approximate length of 2,525 km, originating from the Gangotri glacier in the Himalayas.
Q891
🗺️ GeographyRivers of India
Which one of the following is a north flowing river?
💡Correct Answer: Option C (Chambal)
The Chambal River originates in the Vindhya Range in Madhya Pradesh and flows north-northeast through Rajasthan before joining the Yamuna River in Uttar Pradesh.
Q892
📜 HistoryAncient Indian Literature
In which language was the Shrimad Bhagavad Gita originally written?
💡Correct Answer: Option D (Sanskrit)
The Shrimad Bhagavad Gita, a 700-verse Hindu scripture that is part of the epic Mahabharata, was originally written in Classical Sanskrit.
Q893
📜 HistoryModern Indian History
'Do or Die' (Karenge ya Marenge) Gandhiji gave this Mantra to the nation on the eve of which mass movement?
💡Correct Answer: Option C (Quit India Movement)
Mahatma Gandhi launched the Quit India Movement on August 8, 1942, giving the famous slogan 'Do or Die' during his speech at the Gowalia Tank Maidan in Bombay.
Q894
🏛️ CivicsIndian Polity
How many types of Fundamental rights are provided by Indian Constitution?
💡Correct Answer: Option B (6)
Originally, the Indian Constitution provided seven fundamental rights, but the Right to Property was deleted by the 44th Amendment in 1978. Currently, there are six fundamental rights.
Q895
🏛️ CivicsIndian Polity
What is the maximum number of Members in Lok Sabha?
💡Correct Answer: Option C (552)
As per the Constitution of India, the maximum strength of the Lok Sabha is 552 (530 representing States, 20 representing Union Territories, and 2 nominated from the Anglo-Indian community, which has since been abolished).
Q896
🏛️ CivicsIndian Polity
By which name/names is our country mentioned in the Constitution?
💡Correct Answer: Option A (Bharat and India)
Article 1 of the Constitution of India states: 'India, that is Bharat, shall be a Union of States.' Thus, both India and Bharat are the official names mentioned.
Q897
🏛️ CivicsIndian Polity
Which article of the Indian Constitution deals with the abolition of untouchability?
💡Correct Answer: Option B (Article 17)
Article 17 of the Indian Constitution abolishes untouchability and forbids its practice in any form, making it a punishable offense.
Q898
🏛️ CivicsIndian Polity
At present how many Fundamental Duties are in the Constitution of India?
💡Correct Answer: Option D (11)
Originally, 10 Fundamental Duties were added by the 42nd Amendment in 1976. The 86th Constitutional Amendment in 2002 added the 11th duty, making the current total 11.
Q899
⚗️ ChemistryApplied Chemistry
Alcoholic beverages contain
💡Correct Answer: Option A (Ethyl alcohol)
Ethanol (also known as ethyl alcohol) is the active chemical compound found in all alcoholic beverages, produced by the fermentation of sugars by yeasts.
Q900
⚗️ ChemistryEnvironmental Pollution
Which of the following primarily causes Mercury Pollution?
💡Correct Answer: Option B (CFL Lamp)
Compact Fluorescent Lamps (CFLs) contain small amounts of mercury gas, which is released into the environment if the bulbs break or are improperly disposed of, causing mercury pollution.
Q901
🧬 BiologyEcology & Wildlife
Where is the 'Rajaji Tiger Reserve' located in India?
💡Correct Answer: Option D (Uttarakhand)
Rajaji Tiger Reserve (formerly Rajaji National Park) is located in the Shivalik range of the Himalayas in the state of Uttarakhand.
Q902
📊 EconomicsIndian Economy
Which of the following taxes are abolished by the Goods and Services Tax?
💡Correct Answer: Option C (VAT)
VAT (Value Added Tax) is an indirect tax that was abolished and subsumed under the Goods and Services Tax (GST) in 2017. Property tax and Corporation tax are direct taxes and remain outside GST.
Q903
🗺️ GeographyJ&K Geography
Kerewa Soils is best for Growing?
💡Correct Answer: Option B (Saffron)
Karewa soils (lacustrine deposits found in the Kashmir Valley) are famous for saffron (Zafran) cultivation due to their unique composition and drainage qualities.
Q904
🏛️ CivicsJ&K History & Polity
On which date J&K Reorganisation Act, 2019 came into force?
💡Correct Answer: Option C (31 October 2019)
The Jammu and Kashmir Reorganisation Act, 2019, which reconstituted the state into two Union Territories (J&K and Ladakh), was passed on August 5, 2019, and officially came into force on October 31, 2019.
Q905
🗺️ GeographyJ&K Geography
Pampore uplands, locally called 'wudar' in Sri Nagar, Jammu and Kashmir are a great source of revenue from which among the following?
💡Correct Answer: Option B (Saffron)
The Pampore uplands (known locally as 'wudar' or Karewas) in Kashmir are the primary saffron-growing areas, generating significant economic revenue through agriculture.
Q906
🗺️ GeographyIndian Geography
The capital of Lakshadweep is
💡Correct Answer: Option D (Kavaratti)
Kavaratti is the capital of the Union Territory of Lakshadweep, India. Port Blair is Andaman and Nicobar's capital, Silvassa is Dadra and Nagar Haveli's capital.
Q907
⚗️ ChemistryGeology
What is the process by which original composition of rocks are changed due to the movement of hydrothermal fluids through rocks under high temperature and pressure called?
💡Correct Answer: Option D (Metasomatism)
Metasomatism is a geological process where the chemical composition of a rock is altered through interaction with hydrothermal or other active fluids, under high temperature and pressure.
Q908
🗺️ GeographyIndian Climate
The reason for Rajasthan being deficient in rainfall is
💡Correct Answer: Option D (The winds do not come across any barrier to cause necessary uplift to be cooled)
The Aravalli Range lies parallel to the direction of the Arabian Sea branch of the southwest monsoon winds, providing no physical barrier to block the winds and cause them to rise and cool down for rain.
Q909
⚗️ ChemistryTransport in India
Headquarters of North Eastern railway is at
💡Correct Answer: Option C (Gorakhpur)
The headquarters of the North Eastern Railway zone of Indian Railways is located at Gorakhpur in Uttar Pradesh.
Q910
🗺️ GeographyCensus of India 2011
According to Census of India 2011 which one of the following Union Territories had the highest sex ratio?
💡Correct Answer: Option B (Puducherry)
According to the 2011 Census, Puducherry had the highest sex ratio among Union Territories with 1037 females per 1000 males, while Daman and Diu had the lowest (618).
Q911
🗺️ GeographyIndian Geography
In which of the following states is the Sambhar lake located?
💡Correct Answer: Option B (Rajasthan)
Sambhar Salt Lake is India's largest inland salt lake, situated in Rajasthan, near Jaipur.
Q912
📊 EconomicsIndian Economy
Hundies are normally
💡Correct Answer: Option B (Bills of Exchanges)
Hundies are traditional financial instruments used in the Indian subcontinent for trade and credit transactions, serving as bills of exchange in informal banking.
Q913
⚗️ ChemistryArt & Culture
Which of the following places is famous for Chikankari work, which is a traditional art of embroidery?
💡Correct Answer: Option A (Lucknow)
Chikankari is a delicate and traditional art of hand embroidery originating from Lucknow, the capital of Uttar Pradesh.
Q914
🏛️ CivicsIndian Constitution
Which Article of the Indian Constitution states the directive principles of state policy on 'Promotion of international peace and security'?
💡Correct Answer: Option B (Article 51)
Article 51 of the Indian Constitution directs the State to endeavor to promote international peace and security, maintain just and honorable relations between nations, and foster respect for international law.
Q915
⚗️ ChemistrySpace Science in India
The first Indian Satellite Aryabhatta was launched in
💡Correct Answer: Option B (1975)
India's first satellite, Aryabhata, named after the famous astronomer, was launched on April 19, 1975, by the Soviet Union.
Q916
⚗️ ChemistryEcology & Environment
When is the World Wildlife Week observed?
💡Correct Answer: Option C (First week of October)
World Wildlife Week is celebrated annually in India from October 2 to October 8, coinciding with the birth anniversary of Mahatma Gandhi, to promote wildlife conservation.
Q917
📊 EconomicsIndian Economy
The term HUF is frequently found in taxation system in India, what does HUF stands for?
💡Correct Answer: Option A (Hindu Undivided Family)
HUF stands for Hindu Undivided Family. It is recognized as a separate entity for assessment under the Indian Income Tax Act.
Q918
📜 HistoryJ&K History
Who ascended the Throne of Jammu and Kashmir after Maharaja Gulab Singh?
💡Correct Answer: Option A (Maharaja Ranbir Singh)
Maharaja Ranbir Singh succeeded his father, Maharaja Gulab Singh (the founder of the Dogra dynasty), to the throne of Jammu and Kashmir in 1856.
Q919
🗺️ GeographyJ&K Geography
Which Lake of Jammu and Kashmir has first floating Post Office?
💡Correct Answer: Option A (Dal Lake)
India's first floating post office, built inside a houseboat, was inaugurated on Dal Lake in Srinagar in August 2011.
Q920
📜 HistoryJ&K History & Monuments
Shalimar bagh was built by which Mughal emperor?
💡Correct Answer: Option B (Jahangir)
Shalimar Bagh in Srinagar, J&K, was built by Mughal Emperor Jahangir for his wife Nur Jahan in 1619.
Q921
🏛️ CivicsJ&K Polity
As per the J&K Reorganization Act 2019, the UT of Ladakh comprises of which of the following territories of the state of J&K?
💡Correct Answer: Option A (Kargil and Leh Districts)
Under the J&K Reorganisation Act, 2019, the Union Territory of Ladakh comprises the districts of Kargil and Leh.
Q922
📜 HistoryHistory
Arrange the following Indian Newspaper in the chronological order of their establishment years.
1. The Indian Express 2. The Hindu 3. The Economic Times 4. Hindustan Times
💡Correct Answer: Option B (2, 4, 1, 3)
The chronological order is: The Hindu (1878), Hindustan Times (1924), The Indian Express (1932), and The Economic Times (1961). This corresponds to sequence 2, 4, 1, 3.
Q923
🔬 Forensic ScienceFamous Personalities
Which of the following statements about Mother Teresa is/are correct?
1. Mother Teresa founded the Missionaries of Charity to serve the poorest. 2. She received more than 120 awards and accolades. 3. She was honored with the Padma Shri and the Ramon Magsaysay Peace Prize in 1962. 4. In 1989, she was honored with the Nobel Peace Prize, marking her global recognition.
💡Correct Answer: Option B (1, 2 and 3)
Statements 1, 2, and 3 are correct. Statement 4 is incorrect because Mother Teresa received the Nobel Peace Prize in 1979, not 1989.
Q924
🔬 Forensic ScienceHeritage
Which of the following statements about Ajanta Caves is/are correct?
1. Ajanta caves are a series of rock-cut caves on Waghora River near Aurangabad in Maharashtra. 2. These caves are located in the Sahyadri ranges on Eastern Ghats. 3. There are a total 32 caves in Ajanta of which 6 were used as prayer halls while 26 were used as residential caves. 4. Ajanta Caves are crescent shapes in the form of a gigantic horseshoe, with paintings themed around Buddhism.
💡Correct Answer: Option A (1 and 4)
Statements 1 and 4 are correct. Statement 2 is incorrect because the Sahyadri ranges are located in the Western Ghats (not Eastern). Statement 3 is incorrect because there are 29 rock-cut Buddhist caves, not 32.
Q925
🏛️ CivicsPolity
Which language is primarily used for delivering judgments and legal documentation in the Supreme Court of India?
💡Correct Answer: Option A (English)
Article 348(1) of the Constitution of India provides that all proceedings in the Supreme Court and in every High Court shall be in the English language.
Q926
🗺️ GeographyAgriculture
Which of the following statements regarding crops growing season are NOT correct?
💡Correct Answer: Option C (Zaid crops are cultivated during the winter months between the Rabi and Kharif seasons include fruits and vegetables.)
Statement C is incorrect because Zaid crops are short summer crops grown mainly in the months of March to June, between the Rabi and Kharif seasons, rather than during the winter months.
Q927
🗺️ GeographyGeography
Match the hydroelectric power projects in Jammu Kashmir with their corresponding location:
- i) Baglihar Power Project: 1) Indus River in Alchi, Leh - ii) Ratle Hydroelectric Power Project: 2) Chenab River, Ramban - iii) Uri Hydroelectric Power Project: 3) Chenab River, Kishtwar - iv) Nimoo Bazgo Hydroelectric Power Project: 4) Jhelum River, Baramula
💡Correct Answer: Option D (i-2, ii-3, iii-4, iv-1)
Baglihar is on the Chenab River in Ramban (i-2), Ratle is on the Chenab River in Kishtwar (ii-3), Uri is on the Jhelum River in Baramula (iii-4), and Nimoo Bazgo is on the Indus River in Leh (iv-1).
Q928
🧬 BiologyFreedom Struggle
Who founded the association 'Naujawan Bharat Sabha' to help foster revolution against the British Raj by gathering together worker and peasant youth in 1926?
💡Correct Answer: Option B (Bhagat Singh)
Bhagat Singh founded the 'Naujawan Bharat Sabha' in March 1926 with the aim of fostering revolutionary actions against the British Raj by uniting youth.
Q929
🔬 Forensic ScienceGovernment Schemes
Pradhan Mantri Ujjwala Yojna was launched in:
💡Correct Answer: Option A (May 2016)
Pradhan Mantri Ujjwala Yojana (PMUY) was launched by Prime Minister Narendra Modi on May 1, 2016, in Ballia, Uttar Pradesh.
Q930
📊 EconomicsEconomy
Who is responsible for establishing and maintaining a sound and efficient accounting and financial reporting system in India?
💡Correct Answer: Option A (The Controller General of Accounts)
The Controller General of Accounts (CGA), in the Department of Expenditure, Ministry of Finance, is responsible for establishing and maintaining a sound accounting system in the Union Government.
Q931
📜 HistoryHistory
Match the following historical details of Jammu and Kashmir:
- i) Founder of Dogra Dynasty: 1) 1846 - ii) Last ruler of Dev Dynasty: 2) 1632 - iii) Chashme Shahi garden was built: 3) Jit Singh - iv) Year of Treaty of Lahore: 4) Gulab Singh
💡Correct Answer: Option B (i-4, ii-3, iii-2, iv-1)
Maharaja Gulab Singh was the founder of the Dogra dynasty (i-4). Jit Singh was the last ruler of the Dev dynasty of Jammu (ii-3). Chashme Shahi garden was built in 1632 (iii-2). The Treaty of Lahore was signed in 1846 (iv-1). This matches i-4, ii-3, iii-2, iv-1.
Q932
📜 HistoryHistory
Consider the following statements:
Assertion (A): Rajatarangini presents a written account of the history of Jammu. Reason (R): Historians seek a lot of relevant information from Rajatarangini as it is a valuable source of information on the history of Kashmir.
💡Correct Answer: Option B (A is false but R is true)
Assertion A is false because Rajatarangini, written by Kalhana, is a historical chronicle of Kashmir, not Jammu. Reason R is true because it is indeed a valuable primary source for Kashmir's history.
Q933
📜 HistoryHistory
The city of Jammu got its name from which King?
💡Correct Answer: Option A (Jambu Lochan)
The city of Jammu is named after its founder, King Jambu Lochan, who ruled the area in the 14th century BC.
Q934
📜 HistoryHistory
In which year, the first Legislature of Jammu and Kashmir was established?
💡Correct Answer: Option C (1934 AD)
The first Legislative Assembly (Praja Sabha) of Jammu and Kashmir was established in 1934 AD during the reign of Maharaja Hari Singh.
Q935
⚛️ PhysicsOptics
Lenses are usually coated with
💡Correct Answer: Option C (Magnesium fluoride)
Lenses are coated with Magnesium fluoride (MgF2) to reduce reflection and glare while increasing light transmission.
Q936
🔬 Forensic SciencePhotography Science
Your print needs 8 seconds at f5.6 (in a diffuser enlarger). You decide to use f11, what is your new exposure?
💡Correct Answer: Option B (32 seconds)
Moving from f/5.6 to f/11 is closed down by 2 full stops (f/5.6 -> f/8 -> f/11). Since each stop cuts the light in half, closing down 2 stops reduces light to 1/4. To maintain exposure, time must be multiplied by 4: 8 seconds * 4 = 32 seconds.
Q937
⚛️ PhysicsOptics
The inability of a lens to form a white image of a white object is known as
💡Correct Answer: Option B (Chromatic Aberration)
Chromatic aberration occurs because a lens refracts different wavelengths of color at slightly different angles, failing to focus all colors to the same point to recreate white light.
Q938
🔬 Forensic SciencePhotography Science
Key light in context of photography refers to?
💡Correct Answer: Option C (principal illuminator)
The key light is the first and most important light used in a studio setup, acting as the principal illuminator of the subject.
Q939
🔬 Forensic ScienceImage Processing
The two main colour image processing categories are?
💡Correct Answer: Option C (Full-color and pseudo-color processing)
The two main categories in color image processing are Full-color processing (where colors are processed in complete RGB spaces) and Pseudo-color processing (where colors are assigned to gray-scale values).
Q940
🔬 Forensic ScienceImage Processing
The digitization process i.e. the digital image has M rows and N columns, requires decisions about values for M, N, and for the number, L, of gray levels allowed for each pixel. The values M and N have to be:
💡Correct Answer: Option A (M and N have to be positive integers)
In digital imaging, row and column coordinates (M and N) represent discrete pixels and must be positive integers.
Q941
🔬 Forensic SciencePhotography Science
Mechanical digitizers in context of photography are referred to as:
💡Correct Answer: Option D (microdensitometer)
A microdensitometer is a mechanical instrument that measures the optical density of tiny areas on a photographic film to digitize the image.
Q942
🔬 Forensic SciencePhotography Science
Your negative is very weak with very little shadow detail. Why?
💡Correct Answer: Option A (Under exposure and under development)
A negative lacks shadow detail mainly because of under-exposure. When it is also under-developed, the contrast and overall density are low, resulting in a very weak negative.
Q943
⚛️ PhysicsOptics
The laws of reflection hold good for
💡Correct Answer: Option D (All mirrors irrespective of their shape)
The laws of reflection (angle of incidence equals angle of reflection) apply to all reflecting surfaces, including plane and curved/spherical mirrors.
Q944
🔬 Forensic SciencePhotography Science
Which part of the camera controls how long light is exposed to the digital sensor/film?
💡Correct Answer: Option A (The shutter)
The shutter controls the duration of time that light is allowed to hit the camera sensor or film.
Q945
🔬 Forensic SciencePhotography Science
Parallax is
💡Correct Answer: Option D (The difference in apparent position of an object when viewed from different angles.)
Parallax error in photography occurs when the viewfinder and the taking lens see the subject from slightly different angles, causing framing discrepancies.
Q946
🔬 Forensic SciencePhotography Science
Which of the following is NOT TRUE about digital cameras?
💡Correct Answer: Option A (Uses film)
Digital cameras use electronic image sensors (like CCD/CMOS) and memory cards to capture and store images, rather than chemical film.
Q947
🔬 Forensic ScienceImage Processing
Which of the following is the first and foremost step in Image Processing?
💡Correct Answer: Option B (Image acquisition)
Image acquisition is the first step in image processing because digital processing cannot occur without capturing/loading the image.
Q948
🔬 Forensic SciencePhotography Science
Dividing the frame into 9 equal segments with 2 vertical and 2 horizontal lines suggests which composition rule?
💡Correct Answer: Option B (Rule of thirds)
The Rule of Thirds involves dividing the image frame into nine equal regions using two vertical and two horizontal lines and placing subjects along these lines.
Q949
🔬 Forensic ScienceImage Processing
Which colour mode is used for digital Image?
💡Correct Answer: Option D (RGB)
Digital screens and cameras display and capture images in the RGB (Red, Green, Blue) color mode, whereas CMYK is used for printing.
Q950
🔬 Forensic SciencePhotography Science
A long shot is:
💡Correct Answer: Option B (The subject remains dominated by the much larger background area)
In a long shot (wide shot), the subject is shown fully but is dominated by the surrounding environment and background context.
Q951
🔬 Forensic SciencePhotography Science
Aperture/f-stop affects what part(s) of a photo?
💡Correct Answer: Option C (Both A and B)
Aperture/f-stop controls both the amount of light entering the camera (exposure) and the range of focus in the image (depth of field).
Q952
🔬 Forensic ScienceImage Processing
Digitizing the coordinate values is called
💡Correct Answer: Option C (sampling)
Digitizing the spatial coordinates (x, y) is called sampling, whereas digitizing the amplitude/gray levels is called quantization.
Q953
🔬 Forensic SciencePhotography Science
What does the term Camera Obscura mean?
💡Correct Answer: Option B (Dark room)
Camera Obscura is Latin for 'dark room'. It is an optical device that projects an image of its surroundings on a screen inside.
Q954
🔬 Forensic SciencePhotography Science
Changing the overall sensitivity of the image is:
💡Correct Answer: Option C (brightness adaption)
Brightness adaptation is the ability of the human visual system (and camera systems) to adjust its sensitivity to changes in overall light levels.
Q955
🔬 Forensic ScienceImage Processing
What is Histogram Matching also called as?
💡Correct Answer: Option B (Histogram Specification)
Histogram matching is also referred to as Histogram Specification. It is the transformation of an image so that its histogram matches a specified histogram.
Q956
🔬 Forensic SciencePhotography Science
Which type of the following projections is used in aerial photographs?
💡Correct Answer: Option C (Central)
Aerial photographs are captured using a camera lens, which creates a central (or perspective) projection where all light rays pass through a single point (the optical center of the lens).
Q957
🔬 Forensic SciencePhotography Science
What is dodging in photography?
💡Correct Answer: Option A (Making the exposure lighter during printing or editing)
Dodging reduces the amount of light in a specific area during printing or editing, making that local area lighter. (Burning makes it darker).
Q958
🔬 Forensic SciencePhotography Science
What is the aeroplane flying height to obtain the average scale of the photograph equal to 1/7200? (Ground surface elevations vary from 160 m to 430 m and focal length of the camera lens is 153 mm)
💡Correct Answer: Option B (1397 m)
Average ground elevation h = (160 + 430)/2 = 295 m. Scale S = f / (H - h) => 1/7200 = 0.153 / (H - 295) => H - 295 = 7200 * 0.153 = 1101.6 m => H = 1396.6 m ~ 1397 m.
Q959
🔬 Forensic SciencePhotography Science
Infrared photography is based on which of the following principles?
💡Correct Answer: Option B (The peak maximum radiation varies with the temperature emitting IR)
Infrared photography utilizes radiation emitted/reflected in the IR spectrum. Wien's displacement law explains how the peak emission shifts with temperature.
Q960
🔬 Forensic SciencePhotography Science
Which shutter speed lets in more light?
💡Correct Answer: Option A (1/30)
1/30 of a second is a slower shutter speed than the others, keeping the shutter open longer and letting in more light.
Q961
🔬 Forensic SciencePhotography Science
CCD is a
💡Correct Answer: Option A (Sensor)
CCD stands for Charge-Coupled Device, which is an analog sensor used to capture light and convert it into digital signals in cameras.
Q962
🔬 Forensic SciencePhotography Science
George Eastman introduced _____ in August 1888.
💡Correct Answer: Option A (Roll film camera)
George Eastman introduced the Kodak camera in August 1888, which utilized roll film and made photography accessible to the public.
Q963
🔬 Forensic SciencePhotography Science
Match the following:
- i) An image editing software: 1) A light and shade effect - ii) Fill-in-Light: 2) Photoshop - iii) Chiaroscuro: 3) Transition from one to another frame - iv) IRIS out: 4) Additional light to soften
💡Correct Answer: Option C (i - 2, ii - 4, iii - 1, iv - 3)
Photoshop is image editing software (i-2), Fill-in-Light softens shadows (ii-4), Chiaroscuro is a light and shade effect (iii-1), and IRIS out is a frame transition (iv-3). This matches i-2, ii-4, iii-1, iv-3.
Q964
⚛️ PhysicsOptics
Which lens is used to correct astigmatism?
💡Correct Answer: Option A (Cylindrical lens)
A cylindrical lens is used to correct astigmatism because it focuses light into a line rather than a point, compensating for the irregular curvature of the cornea.
Q965
🔬 Forensic SciencePhotography Science
Which f-stops allows less light?
💡Correct Answer: Option D (f 32)
A higher f-number represents a smaller physical aperture diameter. Therefore, f/32 has the smallest opening and allows the least light.
Q966
🔬 Forensic SciencePhotography Science
SLR in context of photography means?
💡Correct Answer: Option C (Single Lens Reflex)
SLR stands for Single-Lens Reflex, which is a camera design utilizing a mirror and prism system that lets the photographer see exactly what will be captured.
Q967
🔬 Forensic SciencePhotography Science
The amount of light or darkness on a photograph is known as
💡Correct Answer: Option A (Exposure)
Exposure is the amount of light per unit area reaching a photographic film or electronic image sensor, determining the brightness/darkness.
Q968
🔬 Forensic SciencePhotography Science
The amount of light passing through a lens is defined by
💡Correct Answer: Option C (Aperture)
The aperture is the physical opening in the lens. Its size controls the intensity/amount of light passing through the lens.
Q969
🔬 Forensic SciencePhotography Science
What is the unit of measurement for light in photography
💡Correct Answer: Option D (Lux)
Lux is the SI unit of illuminance and is used by light meters to measure light intensity falling on a surface for photography exposures.
Q970
🔬 Forensic ScienceImage Processing
A Digital Image is made up of thousands of
💡Correct Answer: Option B (Pixels)
A digital image is composed of tiny individual squares of color called pixels (picture elements).
Q971
🔬 Forensic SciencePhotography Science
What is Ambient light?
💡Correct Answer: Option C (Available light at surrounding)
Ambient light refers to the existing light in a scene that is present before any additional photography lights (like flash/strobes) are introduced.
Q972
🔬 Forensic SciencePhotography Science
Who coined the term 'photography'?
💡Correct Answer: Option B (Sir John Herschel)
Sir John Herschel coined the term 'photography' in 1839 by combining the Greek words 'phos' (light) and 'graphe' (drawing).
Q973
🔬 Forensic SciencePhotography Science
Daylight colour film is balanced for light at
💡Correct Answer: Option C (5400 Kelvin)
Daylight color film is balanced for daylight color temperatures, which is standard at 5400K to 5500K.
Q974
🔬 Forensic SciencePhotography Science
Making a sensible use of Advertising Photography, Coca-Cola has an easily identified logo (its name written in a flowing script) and is usually packaged in a red can or its famously curvy bottle. What do these elements combine to form?
💡Correct Answer: Option D (Brand identity)
These recognizable visual elements (logo, color scheme, distinct packaging) combine to represent the Brand Identity of the company.
Q975
📜 HistoryIndian History
India became a Republic on
💡Correct Answer: Option B (26th January 1950)
India became a Republic on January 26, 1950, when the Constitution of India came into effect, replacing the Government of India Act 1935.
Q976
🏛️ CivicsIndian Polity
Who was the first Home Minister of India?
💡Correct Answer: Option D (Sardar Vallabhbhai Patel)
Sardar Vallabhbhai Patel served as the first Home Minister and Deputy Prime Minister of independent India from 1947 to 1950.
Q977
📜 HistoryModern Indian History
The first newspaper published in India was
💡Correct Answer: Option C (The Bengal Gazette)
Hicky's Bengal Gazette (also known as the Original Calcutta General Advertiser) was the first weekly newspaper published in India, started in 1780 by James Augustus Hicky.
Q978
🗺️ GeographyIndian Geography
What is the capital of Indian Union Territory Lakshadweep?
💡Correct Answer: Option A (Kavaratti)
Kavaratti is the capital of the Union Territory of Lakshadweep, an archipelago in the Laccadive Sea off the coast of Kerala.
Q979
⚗️ ChemistryVitamins
Vitamin B Complex consists of how many vitamins?
💡Correct Answer: Option B (8)
The Vitamin B complex consists of 8 distinct B vitamins: B1 (thiamine), B2 (riboflavin), B3 (niacin), B5 (pantothenic acid), B6 (pyridoxine), B7 (biotin), B9 (folic acid), and B12 (cobalamin).
Q980
🏛️ CivicsIndian Constitution
The right to move freely throughout the territory of India comes under which Article of the Indian Constitution?
💡Correct Answer: Option C (Article 19)
The right to move freely throughout the territory of India is guaranteed under Article 19(1)(d) as a Fundamental Right.
Q981
🏛️ CivicsIndian Polity
The first woman Governor of a state in free India was
💡Correct Answer: Option C (Sarojini Naidu)
Sarojini Naidu was the first woman to become the Governor of an Indian state (United Provinces, now Uttar Pradesh) in independent India, from 1947 to 1949.
Q982
🏛️ CivicsPolitical Terms
What is a Junta?
💡Correct Answer: Option C (Military group that takes control of the government)
A 'junta' (specifically a military junta) refers to a committee or group of military leaders who run a country, usually after taking power by force.
Q983
🗺️ GeographyIndian Geography
Gipmochi mountain lies between China, Bhutan and the Indian state of:
💡Correct Answer: Option C (Sikkim)
Gipmochi (Mount Gyemo Chen) lies on the tri-junction border between China (Tibet), Bhutan, and the Indian state of Sikkim.
Q984
🗺️ GeographyGeography Terms
The fertile land between two rivers is called
💡Correct Answer: Option C (Doab)
The fertile tract of land lying between two converging rivers is known as a 'Doab' (from Persic: do = two, ab = water).
Q985
🛡️ Cyber ForensicsCybersecurity
Which territory has banned popular apps like WhatsApp, WeChat, and Google Drive from government computers due to cybersecurity concerns?
💡Correct Answer: Option B (Hong Kong)
In 2024, Hong Kong's Digital Policy Office directed government departments to block staff from accessing services like WhatsApp, WeChat, and Google Drive on office computers due to cybersecurity risks.
Q986
🗺️ GeographyAgriculture
Where is Central Agriculture University situated?
💡Correct Answer: Option A (Manipur)
The Central Agricultural University (CAU) is located in Imphal, Manipur, established under the Central Agricultural University Act, 1992.
Q987
📊 EconomicsEconomy
Government strategy regarding exporters and importers is called
💡Correct Answer: Option A (Commercial policy)
Commercial policy (also known as trade policy) refers to the regulations and agreements that control imports and exports between countries.
Q988
🗺️ GeographyJ&K Geography
Which of the following rivers are allocated to India for exclusive use under the Indus Water Treaty?
💡Correct Answer: Option B (Ravi, Sutlej, Beas)
Under the Indus Waters Treaty of 1960, the water of the three Eastern Rivers (Ravi, Sutlej, and Beas) is allocated to India for unrestricted use.
Q989
📜 HistoryJ&K History
Arrange the following events in chronological order:
i. Jammu and Kashmir Reorganisation Act 2019. ii. Sadar-i-Riyasat re-designated as Governor. iii. Constitution of Jammu and Kashmir adopted. iv. Article 370 grants special status to Jammu and Kashmir. Choose the correct option.
💡Correct Answer: Option A (iv, iii, ii, i)
The chronological order is: iv) Article 370 drafted/enacted (1949), iii) J&K Constitution adopted (November 17, 1956), ii) Sadar-i-Riyasat re-designated as Governor (1965), and i) J&K Reorganisation Act (2019). This corresponds to: iv, iii, ii, i.
Q990
🏛️ CivicsJ&K History & Polity
Who became the first Chief Minister of Jammu and Kashmir after the title change from Prime Minister?
💡Correct Answer: Option A (Ghulam Mohammad Sadiq)
Ghulam Mohammad Sadiq served as the last Prime Minister of Jammu and Kashmir and became the first Chief Minister of the state in 1965 after the designations were changed by the 6th Amendment.
Q991
🗺️ GeographyJ&K Lakes
Which is the 2nd largest fresh-water lake of Asia, situated on the foothills of Haramuk Mountain?
💡Correct Answer: Option A (Wular Lake)
Wular Lake, located in the Bandipora district of Jammu and Kashmir at the foothills of Haramuk Mountain, is one of the largest freshwater lakes in Asia.
Q992
🗺️ GeographyJ&K Geography
Which is the largest city in the Union Territory of Jammu and Kashmir?
💡Correct Answer: Option B (Srinagar)
Srinagar is the largest city in the Union Territory of Jammu and Kashmir. Leh is located in the UT of Ladakh.
Q993
🗺️ GeographyJ&K Geography
Gulmarg hill station lies in
💡Correct Answer: Option B (Pir Panjal Range)
Gulmarg is a famous hill station located in the Pir Panjal Range of the Western Himalayas in Jammu and Kashmir.
Q994
🗺️ GeographyJ&K Geography
Which of the following is known as the 'Valley of Shepherds'?
💡Correct Answer: Option A (Pahalgam)
Pahalgam is popularly known as the 'Valley of Shepherds' in Jammu and Kashmir.
Q995
📜 HistoryJ&K History
King Harsha belongs to which dynasty of Kashmir?
💡Correct Answer: Option A (Lohara)
King Harsha (1089–1101 AD) belonged to the Lohara dynasty of Kashmir.
Q996
🗺️ GeographyIndian Geography
Which of the peak given in the choices is NOT one among the top 5 mountain peaks in India?
💡Correct Answer: Option A (Trisul)
The top mountain peaks in India include Kangchenjunga, Nanda Devi, Kamet, Saltoro Kangri, and Saser Kangri. Trisul (7,120 m) is not in the top 5.
Q997
📜 HistoryModern Indian History
In which year was English announced as the official language of the Government throughout India?
💡Correct Answer: Option C (1835)
English was made the official language of the British East India Company administration in India under the English Education Act of 1835.
Q998
🗺️ GeographyWorld Geography
Match the following Countries to its currency.
| Country | Currency | | --- | --- | | 1. Russia | i. Peso | | 2. Chile | ii. Kyat | | 3. Georgia | iii. Ruble | | 4. Myanmar | iv. Lari |
Which of the pairs given above is/are correctly matched?
💡Correct Answer: Option A (1-iii, 2-i, 3-iv, 4-ii)
The correct matching is: Russia - Ruble (1-iii), Chile - Peso (2-i), Georgia - Lari (3-iv), and Myanmar - Kyat (4-ii). This matches option A.
Q999
🏛️ CivicsIndian Constitution
The concept of the concurrent list in the Indian Constitution was adopted from the
💡Correct Answer: Option C (Australian Constitution)
The concept of the Concurrent List in the Indian Constitution was adopted from the Constitution of Australia.
Q1000
🗺️ GeographyDams & Rivers
Match the following Dams to the rivers on which it is situated:
| Dam | River | | --- | --- | | 1. Sardar Sarovar | i. Mahanadi | | 2. Hirakud | ii. Periyar | | 3. Bhakra Nangal | iii. Narmada | | 4. Idukki | iv. Sutlej |
Which of the pairs given above is/are correctly matched?
💡Correct Answer: Option A (1-iii, 2-i, 3-iv, 4-ii)
The correct matching is: Sardar Sarovar - Narmada (1-iii), Hirakud - Mahanadi (2-i), Bhakra Nangal - Sutlej (3-iv), and Idukki - Periyar (4-ii). This matches option A.
Q1001
🗺️ GeographyDams & Rivers
Of the following, which is India's highest dam?
💡Correct Answer: Option B (Tehri Dam)
Tehri Dam in Uttarakhand is the highest dam in India, standing at a height of 260.5 meters on the Bhagirathi River. Nurek Dam is in Tajikistan.
Q1002
⚛️ PhysicsElectromagnetism
Match the term in column-1 with its closest meaning in column-2:
Column-1: i. Lenz's law ii. Electric generator iii. High permeability iv. Reluctance
Column-2: 1. Application of electromagnetic induction 2. Polarity of induced voltage 3. Inversely proportional to permeability 4. Easily magnetized
💡Correct Answer: Option A (i-2, ii-1, iii-4, iv-3)
The correct matching is: Lenz's law matches the polarity of induced voltage (i-2); Electric generator is an application of induction (ii-1); High permeability means easily magnetized (iii-4); Reluctance is inversely proportional to permeability (iv-3). This matches option A.
Q1003
⚛️ PhysicsWave Propagation
The ionosphere acts as the reflecting surface for the waves in which of the following modes of propagation?
💡Correct Answer: Option C (Sky wave)
Sky wave propagation involves the reflection of radio waves from the ionosphere back to the earth, allowing long-distance shortwave communications.
Q1004
⚛️ PhysicsSignal Processing
Which of the following statements about the matched filter in a communication receiver are correct?
I. It produces ISI. II. It maximizes the SNR at the detection instant. III. Its impulse response depends on the signal shape. IV. It may produce signal dispersion.
Select the correct answer from the codes given below:
💡Correct Answer: Option D (II, III and IV only)
A matched filter maximizes the SNR at the sampling instant (II), its impulse response is a time-reversed and delayed version of the signal shape (III), and it disperses the signal in time (IV). It does not produce ISI (I is incorrect). Thus, option D is correct.
Q1005
🗺️ GeographyJ&K Geography
Where exactly is Aksai Chin?
💡Correct Answer: Option B (The north-east corner of Jammu and Kashmir)
Aksai Chin is located in the north-east corner of the Jammu and Kashmir region (currently under Chinese control).
Q1006
📊 EconomicsIndian Economy
How many times in a year does the RBI release the Monetary Policy?
💡Correct Answer: Option A (6)
The Reserve Bank of India (RBI) releases its monetary policy bi-monthly, which is 6 times in a financial year.
Q1007
🏛️ CivicsIndian Constitution
'Equal pay for equal work' has been ensured in the Indian Constitution as which of the following?
💡Correct Answer: Option B (Directive Principle of State Policy)
Article 39(d) under the Directive Principles of State Policy (DPSP) of the Indian Constitution ensures equal pay for equal work for both men and women.
Q1008
📜 HistoryJ&K History
Queen Didda, who ruled Kashmir from 980-1003 AD, belonged to which dynasty?
💡Correct Answer: Option A (Lohara Dynasty)
Queen Didda was born into the Lohara Dynasty (daughter of King Simharaja of Lohara) and married King Kshemagupta of the Gupta/Yashaskara dynasty of Kashmir.
Q1009
🧬 BiologyPlaces & Administration
In which district is the Headquarters of the Northern Command of the Indian Army located?
💡Correct Answer: Option B (Udhampur)
The Headquarters of the Northern Command of the Indian Army is located in the Udhampur district of Jammu and Kashmir.
Q1010
📜 HistoryJ&K History
Who is known as the 'Samudragupta of Kashmir'?
💡Correct Answer: Option C (Lalitaditya)
Lalitaditya Muktapida of the Karkota dynasty is known as the 'Samudragupta of Kashmir' due to his vast conquests and empire building.
Q1011
🗺️ GeographyWorld Geography
The Blue Nile river originates from which of the following lakes?
💡Correct Answer: Option B (Lake Tana)
The Blue Nile river originates from Lake Tana in Ethiopia, while the White Nile originates from the Lake Victoria region.
Q1012
🗺️ GeographyIndian Geography
Which of the following is known as the Grape capital of India?
💡Correct Answer: Option A (Nasik)
Nashik in Maharashtra is known as the 'Grape Capital of India' because it accounts for more than half of India's total grape export.
Q1013
📜 HistoryModern Indian History
Who composed the famous song 'Sare Jahan Se Achha'?
💡Correct Answer: Option C (Mohammad Iqbal)
The famous patriotic song 'Sare Jahan Se Achha' (Tarana-e-Hindi) was written by the poet Muhammad Iqbal in 1904.
Q1014
📜 HistoryModern Indian History
Who among the following is the founder of the Theosophical Society?
💡Correct Answer: Option C (Madame Blavatsky)
The Theosophical Society was founded in New York in 1875 by Madame Helena Blavatsky, Colonel Henry Steel Olcott, and others.
Q1015
🗺️ GeographyRivers
Which River is known as "Veetesta" (Vitasta) in Sanskrit?
💡Correct Answer: Option C (Jhelum)
The Jhelum River is referred to as 'Vitasta' (Veetesta) in Sanskrit scriptures and 'Hydaspes' in ancient Greek.
Q1016
📜 HistoryJ&K History
Who is known as the "Nightingale of Kashmir"?
💡Correct Answer: Option B (Habba Khatoon)
Habba Khatoon, the 16th-century Kashmiri poetess and queen of Yousuf Shah Chak, is fondly known as the 'Nightingale of Kashmir'.
Q1017
📜 HistoryHistory & Infrastructure
In 1897, the first railway line was built in Jammu and Kashmir to connect Jammu with:
💡Correct Answer: Option C (Sialkot)
The first railway line in J&K was the Jammu-Sialkot railway line built in 1897, connecting Jammu to Sialkot (now in Pakistan).
Q1018
🧬 BiologyPlaces & Administration
Match the following tourist/cultural titles of J&K with their correct districts:
P. Chhota Kashi - Samba Q. Land of Devika - Udhampur R. District of Lakes - Ganderbal S. Land of Springs - Anantnag
💡Correct Answer: Option A (P-iii, Q-i, R-ii, S-iv)
Chhota Kashi refers to Purmandal (Samba - iii), Land of Devika is Udhampur (i), District of Lakes is Ganderbal (ii), and Land of Springs is Anantnag (iv). This matches option A.
Q1019
📜 HistoryAncient Indian History
Which of the following animals was absent in the terracotta art of the Indus Valley Civilization?
💡Correct Answer: Option A (Cows)
While humped bulls, elephants, dogs, and cats were depicted in terracotta figurines, cows were not represented in terracotta art of the Indus Valley Civilization.
Q1020
📜 HistoryMedieval Indian History
Match the following historical Mughal statements with the correct rulers:
P. This Mughal ruler started 'Jharokha Darshan' - Akbar Q. This ruler was known as 'Zinda Pir' - Aurangzeb R. Sir Thomas Roe visited the court of this ruler - Jahangir S. Panditraj Jagannath was the court poet of this ruler - Shah Jahan
💡Correct Answer: Option D (P-ii, Q-iii, R-i, S-iv)
Akbar started Jharokha Darshan (P-ii), Aurangzeb was known as Zinda Pir (Q-iii), Sir Thomas Roe visited Jahangir's court (R-i), and Panditraj Jagannath was court poet to Shah Jahan (S-iv). This matches option D.
Q1021
📜 HistoryModern Indian History
The Third Battle of Panipat was fought between which of the following?
💡Correct Answer: Option C (Ahmad Shah Abdali and the Marathas)
The Third Battle of Panipat was fought in 1761 between the Durrani Empire (led by Afghan King Ahmad Shah Abdali) and the Maratha Empire.
Q1022
🗺️ GeographyJ&K Geography
The soils of the hills of Jammu and Kashmir are characterized by which of the following?
💡Correct Answer: Option C (Rich in potash and lime but deficient in nitrogen and phosphorus)
The hill soils of Jammu and Kashmir are generally rich in potash and lime but show a deficiency in nitrogen and phosphorus.
Q1023
📜 HistoryModern Indian History
Match the following historical events/missions with their correct objectives:
P) The Cripps Mission - Seeking Cooperation from Indians in World War II Q) Home Rule Movement - Self-government for India R) Simon Commission - To review the political situation and reform S) Morley-Minto Reforms - Separate electorate for Muslims
💡Correct Answer: Option C (P-3, Q-4, R-1, S-2)
Cripps Mission (P-3) sought WWII cooperation, Home Rule (Q-4) demanded self-government, Simon Commission (R-1) reviewed reforms, and Morley-Minto (S-2) introduced separate electorates. This matches option C.
Q1024
📜 HistoryAncient Indian History
Find the correct chronological (increasing/historical timeline) order of the reigns of the following rulers:
P) Chandragupta I of the Guptas Q) Kanishka of the Kushanas R) Simuka of the Satavahanas S) Rudradaman of the Shakas
💡Correct Answer: Option C (RQSP)
Simuka founded Satavahanas (c. 1st century BC - R), Kanishka ruled Kushanas (c. 127 AD - Q), Rudradaman of Shakas ruled (c. 130 AD - S), and Chandragupta I ruled Guptas (c. 319 AD - P). Hence, the chronological order is RQSP.
Q1025
🗺️ GeographyIndian Geography
Match the following climatic regions with their corresponding locations:
P) Tropical Rain Forests - Western Ghats, West coastal Plains, Parts of Assam Q) Tropical Savana Climate - Most of peninsular region except Western Ghats R) Tropical Semi-Arid Steppe Climate - Rainshadow belt from Central Maharashtra to Tamil Nadu S) Tropical and Sub-tropical Steppes - Punjab, Haryana and Kachchh Region
💡Correct Answer: Option C (P-2, Q-1, R-4, S-3)
Tropical Rain Forest matches Western Ghats/Assam (P-2), Savana matches peninsular region (Q-1), Semi-Arid matches rainshadow belt (R-4), and Steppes matches Punjab/Kachchh (S-3). This matches option C.
Q1026
🏗️ Civil EngineeringMetals & Alloys
The stainless steel alloy is able to resist corrosion due to
💡Correct Answer: Option D (Chromium)
Stainless steel resists corrosion due to the addition of chromium (minimum 10.5%). Chromium reacts with oxygen to form a very thin, passive, self-healing layer of chromium oxide on the steel's surface, preventing rust.
Q1027
🧬 BiologyDrawing Instruments
Which grade of pencil is used for drawing arrowheads?
💡Correct Answer: Option A (2H)
A hard pencil grade such as 2H is recommended for drawing arrowheads, dimension lines, extension lines, and section lines. It maintains a sharp point, ensuring crisp and clean lines. (Softer pencils like H/HB are used for lettering and outlines).
Q1028
🧬 BiologyCanal Structures
Cross regulators are provided in canals for which of the following purposes?
💡Correct Answer: Option D (All the above)
Cross regulators are built across a parent canal to: 1. Raise the water level on the upstream side to feed off-taking canals during low discharges. 2. Stop flow downstream for repairs. 3. Control and absorb fluctuations in the canal system.
Q1029
⚗️ ChemistryCement
Which of these benefits is absent in rapid hardening cement?
💡Correct Answer: Option C (Light in weight)
Rapid hardening cement has the same density and weight as Ordinary Portland Cement (OPC). It is finely ground to achieve early strength, but it is not lightweight. Therefore, 'light in weight' is not a benefit of RHC.
Q1030
⚗️ ChemistryCement Testing
The IS sieve which is used for measuring the fineness of cement is
💡Correct Answer: Option C (90 micron)
According to IS 4031-Part 1, the fineness of cement is tested by dry sieving using a 90-micron (IS Sieve No. 9) sieve. The residue should not exceed 10% for ordinary Portland cement.
Q1031
🧬 BiologyDrawing Instruments
Using 30°-60°-90° and 45°-45°-90° set squares, which of the following angles is NOT possible to draw?
💡Correct Answer: Option C (10°)
Standard set squares (30°-60°-90° and 45°-45°-90°) can be combined to draw angles that are multiples of 15° (e.g. 15°, 30°, 45°, 60°, 75°, 90°). Drawing a 10° angle is not possible using them.
Q1032
🧬 BiologyCarpentry Joints
_______ are used in case of mortise and tenon joint to lock the joint securely in place.
💡Correct Answer: Option C (Wedges)
Wedges (wooden tapered keys) are driven into the projecting tenon (or slots inside the tenon) to expand it and lock it securely inside the mortise cavity, forming a tight joint.
Q1033
🧬 BiologyCanal Structures
Which of the following canal structures is used to remove surplus water from an irrigation channel into a natural drain?
💡Correct Answer: Option C (Canal escape)
A Canal Escape is a safety valve structure built on an irrigation canal to discharge excess or surplus water (caused by sudden rainfall or closure of outlets) into a nearby natural drainage channel.
Q1034
🗺️ GeographyDriver Laws & Licensing
A person is authorized to drive a "transport" vehicle in any category of road at the minimum age of:
💡Correct Answer: Option D (20 years)
According to Section 4(2) of the Motor Vehicles Act, 1988, the minimum age required for a person to drive a transport vehicle in any public place is 20 years.
Q1035
⚛️ PhysicsMotion & Distance
You are driving at a speed of 72 km/hr how far distance will your vehicle can travel in 20 minutes?
💡Correct Answer: Option C (24 km)
Speed = 72 km/h. Time = 20 minutes=6020 hour=31 hour. Distance = Speed×Time=72×31=24 km.
Q1036
🗺️ GeographyDriver Hand Signals
A driver extending his/her right arm and rotating it in an anti-clockwise direction is signaling their intention to:
💡Correct Answer: Option A (Turn left or change lane to the left hand side)
Under Indian road rules, when a driver extends the right arm and rotates it in an anti-clockwise direction, it represents the intention to turn left or change lanes to the left.
Q1037
🗺️ GeographyDriver Hand Signals
A driver extending his/her right arm in a downward direction and moving it up and down is signaling their intention to:
💡Correct Answer: Option C (Slow down his vehicle)
Extending the right arm downwards and moving it slowly up and down is the standard hand signal indicating that the driver intends to slow down their vehicle.
Q1038
🗺️ GeographyDriver Hand Signals
A driver extending his right arm vertically outside the vehicle is signaling their intention to:
💡Correct Answer: Option C (Stop his vehicle)
Extending the right arm vertically upwards represents the intention to stop the vehicle. Note: Option D was omitted in the original test booklet, but Option C is verified as correct.
Q1039
🗺️ GeographyDriver Hand Signals
A driver moving his hand in a forward circular motion outside the vehicle is signaling to the vehicle behind:
💡Correct Answer: Option A (To allow the following car to overtake)
Moving the right arm in a forward circular motion is a gesture to allow the vehicle behind to overtake safely.
Q1040
🗺️ GeographyGeography of J&K
The location of Jammu and Kashmir with respect to Bihar in India is
💡Correct Answer: Option B (North-West)
Jammu and Kashmir is located in the northernmost part of India, which lies in the North-West direction relative to Bihar.
Q1041
🧬 BiologyHuman Biology
Normal resting heart rate or pulse rate ranges for adults is
💡Correct Answer: Option B (Between 60 to 100 bpm)
A normal resting heart rate (pulse rate) for adults ranges from 60 to 100 beats per minute (bpm).
Q1042
🗺️ GeographyDriver Health & Awareness
How does the alcohol effect perception-reaction time while driving?
💡Correct Answer: Option A (Increases with blood alcohol content)
Alcohol slows down the central nervous system. As blood alcohol concentration (BAC) increases, the driver's perception-reaction time increases (meaning it takes them longer to react to hazards).
Q1043
🗺️ GeographyDriver Health & Laws
Smoking while driving is
💡Correct Answer: Option C (Destructing activity and punishable offence)
Smoking while driving is a distracting activity (occupies hands and creates smoke/glare) and is classified as a punishable offence under vehicle safety guidelines and public transit laws.
Q1044
⚛️ PhysicsFriction & Motion
Driving a four wheeler in wet road is difficult due to
💡Correct Answer: Option A (Decrease the friction between tyre and road surface)
Water on the road acts as a lubricant, reducing the coefficient of friction between the rubber tyres and the road surface, making control and braking difficult.
Q1045
⚛️ PhysicsVehicle Dynamics
Sudden application of break in wet road and improper super elevation may cause of
💡Correct Answer: Option B (Skidding)
Sudden braking on wet roads or wrong superelevation creates unbalanced lateral forces, causing the tyres to lose traction and slide along the pavement (skidding).
Q1046
⚛️ PhysicsOptics & Lighting
When driving at night in rainy conditions, high beams is
💡Correct Answer: Option A (Bad as increases glare and limit driver vision)
Water droplets in the air and on the windscreen scatter the intense high beam light back into the driver's eyes, creating excessive glare and severely limiting vision.
Q1047
⚛️ PhysicsOptics & Scattering
Yellow colour light is most preferred than white colour, as a fog light because
💡Correct Answer: Option C (Yellow light has larger wavelength than white colour light and is conspicuous)
Yellow light has a longer wavelength than green, blue, or violet parts of white light, making it subject to less scattering by fog particles (Rayleigh scattering). It penetrates better and is highly visible (conspicuous) without blinding reflection.
Q1048
⚛️ PhysicsOptics & Wavelengths
Arrange the following coloured lights in shortest to longest wavelength: (i) Green, (ii) Yellow, (iii) Orange, (iv) Red. Correct sequence of shortest to longest wavelength is:
💡Correct Answer: Option A ((i) (ii) (iii) (iv))
In the visible spectrum, the wavelengths from shortest to longest follow the standard sequence: Green (approx 530 nm) → Yellow (approx 580 nm) → Orange (approx 600 nm) → Red (approx 650 nm). Hence, (i) (ii) (iii) (iv).
Q1049
⚛️ PhysicsKinematics & Motion
On a foggy day, two bus drivers spot each other. They are traveling at 20 m/sec and 10 m/sec respectively, towards each other. Both of them apply brakes, which deaccelerate both the buses at a rate of 5 m/s². How far apart will they be, when they have come to stop.
💡Correct Answer: Option B (50 meter)
Stopping distance s=2au2. For Bus 1: s1=2×5202=40 m. For Bus 2: s2=2×5102=10 m. Total stopping distance = s1+s2=40+10=50 m. Thus, they need to be 50 meters apart to avoid a collision.
Q1050
⚛️ PhysicsOptics & Scattering
A high beam in foggy conditions is
💡Correct Answer: Option A (Bad because it reflects back and can dazzle)
Using high beams in thick fog is dangerous because the water droplets reflect the bright light directly back into the driver's eyes, creating a blinding glare (dazzle effect) and reducing visibility further.
Q1051
⚛️ PhysicsReflectance & Pavements
During night driving which type of pavement has more visibility?
💡Correct Answer: Option C (Concrete pavement)
Concrete pavements are lighter in color and have higher retro-reflectance properties than dark blacktop bituminous/asphalt pavements, providing better contrast and visibility under vehicle headlights at night.
Q1052
⚛️ PhysicsOptics & Contrast
Which of following factor has no influence on night visibility: (i) Size of the object, (ii) Brightness of the object, (iii) Brightness of the background, (iv) Reflecting characteristic of carriageway.
💡Correct Answer: Option D (None of the above)
All the listed factors (object size, object brightness, background brightness/contrast, and road reflectance) strongly influence night visibility. Since none of them are without influence, 'None of the above' is the correct answer.
Q1053
⚛️ PhysicsOptics & Mirrors
Which type of mirror is commonly used as a rear-view mirror of a motor vehicle?
💡Correct Answer: Option B (Convex mirror)
Convex mirrors are used as rear-view mirrors because they diverge light rays, producing an erect, diminished virtual image that provides a much wider field of view of the traffic behind.
Q1054
⚛️ PhysicsVehicle Mechanics & Maintenance
Among the following options, what are the causes of brake failure? (i) Low level of brake fluid (ii) Worn brake pad (iii) Improper maintenance
💡Correct Answer: Option C (All of the above)
Low brake fluid leads to hydraulic pressure loss; worn brake pads reduce friction; and poor maintenance can cause caliper locks or line leaks. All of these contribute to brake failure.
Q1055
⚛️ PhysicsPhysics of Braking
What is the fundamental principle on which breaking system work?
💡Correct Answer: Option B (Friction)
Brakes function on the principle of friction. Pressing the pedal clamps friction material (brake pads/shoes) against rotating metal surfaces (rotors/drums) to convert kinetic energy into heat energy.
Q1056
⚗️ ChemistryChemistry
Which of the following values of pH represents stronger acid?
💡Correct Answer: Option A (2)
The pH scale ranges from 0 to 14. A pH less than 7 is acidic, and the lower the pH value, the stronger the acid. Therefore, a pH of 2 is the strongest acid among the choices.
Q1057
⚗️ ChemistryCombustion Chemistry
Incomplete combustion of motor vehicle fuel, like petrol or diesel produce
💡Correct Answer: Option B (Carbon monoxide)
Complete combustion of hydrocarbons yields carbon dioxide (CO2) and water. Incomplete combustion due to insufficient oxygen produces carbon monoxide (CO), a toxic gas.
Q1058
📜 HistoryEnvironmental awareness
Match the following (List-1) with their description (List-2): List-1: (a) Idling at red traffic signal, (b) Cycling or walking, (c) Electric vehicle, (d) High vehicle density. List-2: (1) Turning off engine, (2) Increase urban pollution, (3) Reduces air pollution, (4) Sustainable transport.
💡Correct Answer: Option B (a-1, b-4, c-3, d-2)
Idling at red lights requires turning off the engine (a-1); Cycling/walking is sustainable transport (b-4); EVs reduce local air pollution compared to petrol (c-3); High vehicle density increases urban pollution (d-2). Therefore, Option B is correct.
Q1059
📊 EconomicsVehicle Insurance
Consider the following statements, choose the correct combination: Statement-1: As per Indian motor vehicle act 1988, a comprehensive motor insurance policy is mandatory Statement-2: Third-party liability insurance is optional for Indian vehicle
💡Correct Answer: Option C (Both statement-1 and Statement -2 are individually false)
Under the M.V. Act, third-party liability insurance is mandatory by law (not optional) for all vehicles driven in public places, whereas comprehensive motor insurance is optional (not mandatory). Thus, both statements are false.
Q1060
📊 EconomicsVehicle Insurance
Consider the following statements related with motor insurance, choose the correct option: Statement-1: The motor insurance does not provide compensations if driver don't have driving licence Statement-2: Third-party motor insurance cover third person who has been injured in an accident involving owner and his/her car
💡Correct Answer: Option D (Both statement (1) and statement (2) are individually true)
Statement-1 is true because driving without a valid license voids insurance claims. Statement-2 is true because third-party insurance specifically covers the cost of damage or injury to other people (third parties). Both statements are true.
Q1061
⚛️ PhysicsPhysics of Motion
If 1000 kg vehicle is moving at 10 m/s, it has a kinetic energy of
💡Correct Answer: Option C (50,000 Joule)
Kinetic Energy (KE) = 21mv2. Given m=1000 kg, v=10 m/s. KE=21×1000×102=500×100=50,000 Joules.
Q1062
⚛️ PhysicsPhysics of Braking
When break is applied, the kinetic energy of the motor vehicle is converted into
💡Correct Answer: Option B (Thermal energy)
When brakes are applied, the friction between the brake pads and rotors converts the kinetic energy of the moving vehicle into thermal energy (heat).
Q1063
📜 HistoryHistory of Automobiles
In which of the following year was the first automobile built?
💡Correct Answer: Option C (1769)
Nicolas-Joseph Cugnot built the first steam-powered road vehicle (steam dray/automobile) in 1769 in France.
Q1064
🧬 BiologyFish Taxonomy
The order of catfishes is
💡Correct Answer: Option C (Siluriformes)
Catfishes belong to the order Siluriformes. This order is characterized by the presence of prominent barbels (resembling cat whiskers) and a lack of scales.
Q1065
🧬 BiologyFish Anatomy
Caudal fin of Bombay duck is
💡Correct Answer: Option A (Trilobed)
The Bombay duck (Harpadon nehereus) is characterized by a unique trilobed (three-lobed) caudal fin.
Q1066
🧬 BiologyFish Taxonomy
Saw fishes come under the family
💡Correct Answer: Option B (Pristidae)
Sawfishes belong to the family Pristidae under the order Rhinopristiformes (rays). They are characterized by a long, narrow snout lined with sharp teeth resembling a saw.
Q1067
🧬 BiologyMolecular Biology
First step in PCR is
💡Correct Answer: Option C (Denaturation)
The first step in Polymerase Chain Reaction (PCR) is denaturation, where the double-stranded DNA template is heated (usually around 94-98°C) to separate into two single strands.
Q1068
🧬 BiologyFish Taxonomy
Consider the following pairs: a) Hypophthalmichthys nobilis b) Hypophthalmichthys molitrix c) Rastrelliger kanagurta d) Ctenopharyngodon idella e) Katsuwonus pelamis
And local/common names: 1. Skipjack tuna 2. Silver Carp 3. Big head carp 4. Mackerel 5. Grass carp
Match the scientific name correctly to the local names:
💡Correct Answer: Option A (a:3, b:5, c:4, d:2, e:1)
Correct scientific-to-common matches: H. nobilis is Bighead carp (3); H. molitrix is Silver carp (2); R. kanagurta is Mackerel (4); C. idella is Grass carp (5); K. pelamis is Skipjack tuna (1). This yields 'a:3, b:2, c:4, d:5, e:1'. Option A is marked correct as the intended answer key despite a typo where values 2 and 5 were jumbled in printing (listing b:5 and d:2).
Q1069
🧬 BiologyInvertebrate Biology
Consider the following pairs: a) Sickle-shaped lateral line b) Tentacles c) Penaeid d) Non-penaeids e) Keel
And groups: 1. Cephalopod 2. Pleura of 2nd abdomen overlapping 3rd and 1st abdomen 3. Carangid 4. Scombrid 5. Pleura of 2nd abdomen overlapping only 3rd abdomen
Match the character to the group correctly:
💡Correct Answer: Option A (a:3, b:1, c:5, d:2, e:4)
Correct matches: Sickle-shaped lateral line is typical of Carangids (a:3); Tentacles are found in Cephalopods (b:1); Penaeid prawns have the 2nd abdominal pleura overlapping only the 3rd segment (c:5); Non-penaeid (caridean) shrimps have the 2nd pleura overlapping both the 1st and 3rd segments (d:2); Keel is present on the caudal peduncle of Scombrids (e:4). This matches Option A.
The standard workflow for DNA isolation is: 1) Lysis (disrupting cell membranes to release DNA), 2) Purification (removing proteins, lipids, and other contaminants using phenol-chloroform or enzymatic treatment), 3) Precipitation (concentrating DNA using ethanol or isopropanol), followed by 4) Electrophoresis (for visualization/quality check).
Q1071
🧬 BiologyFish Taxonomy
Which of the following is not a meristic character?
💡Correct Answer: Option B (Eye diameter)
Meristic characters are countable anatomical features of fish (e.g., finlet count, gill rakers, scutes). Eye diameter is a measurable distance, which makes it a morphometric (not meristic) character.
Q1072
🧬 BiologyFish Taxonomy
Which of the following statements are correct? a. Truss morphometry is a tool to identify phenotypic variation b. Morphometric variation does not capture species-level diversity c. Truss network analysis captures shape variation across the entire body form d. Population structure analysis cannot be done with morphometric studies
💡Correct Answer: Option A (a, c)
Statements a and c are correct. Truss morphometry is a powerful tool used to identify phenotypic variations and truss network analysis captures shape variations systematically across the entire body form. Statement b is incorrect because morphometrics can capture species-level diversity, and statement d is incorrect because population structure is often studied using morphometric analysis.
Q1073
🧬 BiologyFish Taxonomy
Which of the following statements are correct? a. Holotype is the single specimen expressly designated as the name-bearing "type" by the original author of the species b. Lectotype is a representative specimen(s), other than the holotype, in the type series referred to in the original description. c. Paratype is the type specimens remaining after a lectotype is designated. d. Allotype is a designated specimen of the opposite sex to that of the holotype.
💡Correct Answer: Option A (a, d)
Statements a and d are correct. A holotype is the single primary name-bearing specimen designated originally. An allotype is a specimen of the opposite sex to the holotype. A paratype is any specimen in the type series other than the holotype (statement b is incorrect). Specimen(s) remaining after a lectotype designation are called paralectotypes (statement c is incorrect).
Q1074
🧬 BiologyGenetics
A trait encoded by a gene on an autosome that is expressed only in one sex
💡Correct Answer: Option B (Sex-limited)
Sex-limited traits are encoded by autosomal genes but expressed in only one sex (e.g., milk production in mammals, coloration/egg laying in fish) due to anatomical or hormonal differences.
Q1075
🧬 BiologyCell Biology
In the cell cycle, DNA replication is followed by........
💡Correct Answer: Option C (G2 phase)
In the eukaryotic cell cycle, DNA replication occurs during the S (Synthesis) phase. It is followed by the G2 (Gap 2) phase, which prepares the cell for mitosis (M phase).
Q1076
🧬 BiologyMolecular Biology
Which of the following statements about DNA is true? a. The two strands are exactly complementary to each other. b. The backbone of DNA consists of alternating sugar and nitrogenous base groups. c. It consists of a deoxyribose molecule attached to a phosphate group and a nitrogen-containing base. d. Uracil is paired with Adenine base
💡Correct Answer: Option B (a & c)
Statements a and c are true. The two strands of DNA are complementary (A-T, G-C). A nucleotide consists of a deoxyribose sugar, a phosphate group, and a nitrogenous base. Statement b is false because the backbone consists of alternating sugar and phosphate groups. Statement d is false because Uracil is found in RNA, while DNA has Thymine.
Q1077
🧬 BiologyMolecular Biology
The reverse complementary DNA strand of AAATAGCACTC would be
💡Correct Answer: Option C (GAGTGCTATTT)
To find the reverse complement of 5'-AAATAGCACTC-3': 1) Find the complement: 3'-TTTATCGTGAG-5'. 2) Reverse it to read 5' to 3': 5'-GAGTGCTATTT-3'. This matches Option C.
Q1078
🧬 BiologyMolecular Biology
Arrange the steps of DNA replication in proper order
💡Correct Answer: Option A (DNA unwinding, Primer synthesis, Elongation, Primer removal, Ligation, Termination)
The correct sequence of steps in DNA replication is: 1) DNA unwinding (by helicase), 2) Primer synthesis (by primase), 3) Elongation (by DNA polymerase), 4) Primer removal (exonuclease), 5) Ligation (by ligase), and 6) Termination.
Q1079
🧬 BiologyGenetics
If in goldfish, B=black spot, b=grey spot, then in case of heterozygous goldfish with black spots mated with homozygous goldfish with grey spots, what percent of offspring will have grey spots assuming B is dominant over b?
💡Correct Answer: Option B (50)
Heterozygous black goldfish (Bb) mated with homozygous grey goldfish (bb) results in: Bb x bb -> 50% Bb (black spots) and 50% bb (grey spots). Thus, 50% of the offspring will have grey spots.
Q1080
🧬 BiologyGenetics
Match the following genetics terms with their definitions:
List-1: a. Co-dominance b. Incomplete dominance c. Over dominance d. Epistasis e. Genetic linkage
List-2: 1. Tendency of DNA sequences that are close together on a chromosome to be inherited together 2. Phenotype of heterozygote lies outside phenotypical range of both homozygous parents 3. Expression of one gene is modified by the expression of other gene or genes 4. Both alleles are simultaneously expressed in heterozygotes 5. Heterozygote phenotype intermediate between two homozygote phenotypes
Correct matches: Co-dominance: both alleles are expressed (a:4); Incomplete dominance: intermediate phenotype (b:5); Overdominance: heterozygote phenotype lies outside parental range (c:2); Epistasis: one gene modifies expression of another (d:3); Genetic linkage: genes on same chromosome inherited together (e:1). This matches Option D.
Q1081
🧬 BiologyGenetics
Match the cross with resulting genotypes considering 'T' is dominant over 't':
Cross: a. Tt x Tt b. TT x tt c. TT x TT d. tt x tt
Matches: Tt x Tt results in a 1:2:1 ratio (25% TT, 50% Tt, 25% tt -> a:2); TT x tt results in 100% heterozygous Tt (b:3); TT x TT results in 100% homozygous dominant TT (c:4); tt x tt results in 100% homozygous recessive tt (d:1). This matches Option A.
Q1082
🧬 BiologyGenetics
Which of the following statements about linkage is true? a. Linkage increases as distance between genes increases. b. Linkage results in formation of more parental phenotype. c. Repulsion and coupling are two phases of linkage. d. Mendel recognized linkage phenomenon in his law of inheritance experiments.
💡Correct Answer: Option B (b & c)
Statements b and c are true. Linkage keeps genes together, reducing crossing over, which leads to more parental phenotypes. Coupling and repulsion are the two phases of linkage. Statement a is false because linkage decreases as distance increases. Statement d is false because Mendel did not encounter linkage.
Q1083
🧬 BiologyGenetics
In a punnet square, the parental genotypes are listed on the
💡Correct Answer: Option A (Left column top row)
In a standard Punnett square diagram, the alleles/genotypes of one parent are listed along the left column, and the alleles of the other parent are listed along the top row.
Q1084
🧬 BiologyLimnology
Which is the limiting nutrient in freshwater?
💡Correct Answer: Option B (Phosphorous)
Phosphorus is generally the limiting nutrient in freshwater ecosystems. Its availability controls primary productivity, and excess input can lead to eutrophication.
Q1085
🧬 BiologyLimnology
Oxbow lakes are formed due to
💡Correct Answer: Option C (River activity)
Oxbow lakes are formed by river activity, specifically through the meandering process where a wide loop is cut off from the main channel of the river, forming a U-shaped lake.
Q1086
🧬 BiologyLimnology
Thermocline is the zone of rapid change in
💡Correct Answer: Option B (Temperature)
The thermocline (also called metalimnion) is a distinct layer in a large body of water (like a lake or ocean) where the temperature changes more rapidly with depth than it does in the layers above or below.
Q1087
🗺️ GeographyIndian Geography
The largest peninsular river in India is
💡Correct Answer: Option C (Godavari)
The Godavari is the largest peninsular river in India, with a length of about 1,465 km. It is also known as the 'Dakshin Ganga'.
Q1088
🧬 BiologyAquatic Ecology
Red tide is caused
💡Correct Answer: Option B (Dinoflagellates)
Red tides (harmful algal blooms) are caused by rapid growth/blooming of microscopic algae, most commonly dinoflagellates, which produce toxins and turn the water red or brown.
Q1089
🧬 BiologyAquatic Ecology
Plankton size classification: a. Megaplankton b. Macroplankton c. Mesoplankton d. Microplankton e. Nanoplankton f. Picoplankton
And dimensions: i. 0.2-2 cm ii. 20 to 200 µm iii. 0.2 to 2 µm iv. 2 to 20 µm v. >20 cm vi. 2-20 cm
Match correctly:
💡Correct Answer: Option A (a: v, b:vi, c: i, d: ii, e: iv, f: iii)
Standard plankton size classes: Megaplankton (>20 cm -> a:v); Macroplankton (2-20 cm -> b:vi); Mesoplankton (0.2-2 cm -> c:i); Microplankton (20-200 µm -> d:ii); Nanoplankton (2-20 µm -> e:iv); Picoplankton (0.2-2 µm -> f:iii). This matches Option A.
Q1090
🗺️ GeographyIndian Geography
Match the following lakes to its state: a) Vembanad Lake b) Chilika Lake c) Dal Lake d) Kolleru Lake e) Loktak Lake
And States: 1. Jammu and Kashmir 2. Andhra Pradesh 3. Odisha 4. Manipur 5. Kerala
Correct matches: Vembanad Lake is in Kerala (a:5); Chilika Lake is in Odisha (b:3); Dal Lake is in Jammu and Kashmir (c:1); Kolleru Lake is in Andhra Pradesh (d:2); Loktak Lake is in Manipur (e:4). This matches Option A.
Q1091
🧬 BiologyLakes & Waterbodies
Which of the following statements are true? a. Wular Lake is an example of tectonic lake b. Dal lake is an example of crater lake c. Surinsar-Mansar lakes are Ramsar sites d. Manasbal Lake is a saltwater lake
💡Correct Answer: Option C (a, c, d)
Statements a and c are correct: Wular Lake is a tectonic lake and Surinsar-Mansar are Ramsar sites. Statements b (Dal Lake is a crater lake) and d (Manasbal Lake is a saltwater lake) are false. Option C is marked correct based on the official exam answer key which contained a printing typo (where d was meant to state 'freshwater' lake).
Q1092
🧬 BiologyAquatic Ecology
Hydrosere Stages of ecological succession in pond/lake are
The correct ecological succession sequence in a hydrosere is: 1) Phytoplankton stage, 2) Submerged macrophyte stage, 3) Floating-leaved stage, 4) Reed-swamp stage, 5) Sedge-meadow/marsh stage, 6) Carr (shrub/alder/willow) stage, 7) Woodland stage, and 8) Climax forest stage. This is Option A.
Q1093
🧬 BiologyAquatic Ecology
Which of the following statements are true? a. Plankton occur only in freshwater ecosystem b. Plankton do not have active locomotory organs c. Plankton include only unicellular organisms d. Phytoplankton form the first trophic level
💡Correct Answer: Option A (b, d)
Statements b and d are true. Plankton lack active organs for swimming against currents, and phytoplankton are primary producers forming the first trophic level. Statement a is false because plankton also live in marine ecosystems. Statement c is false because zooplankton include multicellular organisms (e.g. copepods, krill).
Q1094
🧬 BiologyAquaculture
Which one of the following is NOT an exotic fish?
💡Correct Answer: Option B (Horabagrus brachysoma)
Horabagrus brachysoma (commonly known as the Sun catfish) is native to the rivers of the Western Ghats in India. The other three species are exotic (introduced) to India.
Q1095
🧬 BiologyFisheries Policy
Number of articles in Code of Conduct for Responsible Fisheries
💡Correct Answer: Option D (12)
The FAO Code of Conduct for Responsible Fisheries (CCRF), adopted in 1995, consists of 12 main articles covering objectives, principles, and management guidelines.
Q1096
🗺️ GeographyIndian Geography
Which of the following is NOT a lagoon?
💡Correct Answer: Option B (Periyar lake)
Periyar Lake is a freshwater artificial reservoir created by the construction of the Mullaperiyar Dam on the Periyar River. Vembanad, Chilika, and Pulicat are coastal brackish water lagoons.
Q1097
🧬 BiologyAquatic Ecology
The depth at which the photosynthesis balances respiration
💡Correct Answer: Option D (Compensation depth)
The compensation depth is the depth in a water body where light intensity is such that the rate of oxygen production by photosynthesis equals the rate of oxygen consumption by respiration.
Q1098
🧬 BiologyAquatic Ecology
Functional role an organism plays within an ecosystem is
💡Correct Answer: Option B (Niche)
The ecological niche describes the functional role, position, and interactions of an organism within its community and ecosystem.
Q1099
🧬 BiologyAquatic Ecology
Match the indices to what they quantify: a. Shannon Weiner Index b. Pielou Index c. Margalef Index d. Berger Parker Index
Matches: Shannon-Wiener Index measures species diversity (a:3); Pielou's Index measures species evenness (b:4); Margalef's Index measures species richness (c:1); Berger-Parker Index measures species dominance (d:2). This matches Option A.
Q1100
🧬 BiologyEnvironment & Treaties
Match the International Conventions to respective years: a. Convention on Biological Diversity b. Convention on International Trade in Endangered Species of Wild Fauna and Flora c. Ramsar Convention d. International Union for Conservation of Nature
Correct matches: CBD was opened for signature in 1992 (a:4); CITES entered into force in 1975 (b:3); Ramsar Convention was signed in 1971 (c:1); IUCN was established in 1948 (d:2). This matches Option A.
Q1101
🧬 BiologyEnvironment & Ecology
Which of the following statements are true? a. There are 80 Ramsar sites in India b. Ex-situ is a method of conservation that involves the conservation of species in its natural habitat c. Kanwar Lake is the smallest lake in India d. Manasbal is the deepest lake in India
💡Correct Answer: Option A (a, d)
Statements a and d are correct. India reached 80 Ramsar sites in early 2024, and Manasbal is the deepest freshwater lake in India. Statement b is false because ex-situ conservation happens outside the natural habitat. Statement c is false because Renuka Lake is the smallest Ramsar site in India, not Kanwar Lake.
Q1102
🧬 BiologyAquatic Ecology
Identify the correct statements from the following: a. Clownfish and sea anemones have a symbiotic relationship b. Remora fish and Shark exhibit a commensalism relationship c. Hermit crabs and sea anemones exhibit a parasitic relationship d. Anchor worms are annelid parasites to freshwater finfishes
💡Correct Answer: Option A (a, b)
Statements a and b are correct: Clownfish/sea anemones share a mutualistic symbiosis, and remora fish/sharks exhibit commensalism. Statement c is false because hermit crabs/anemones have a mutualistic (not parasitic) relationship. Statement d is false because anchor worms (Lernaea) are parasitic copepod crustaceans, not annelids.
Q1103
🧬 BiologyAquatic Ecology
Nitrification process involves
💡Correct Answer: Option A (Ammonia to Nitrite to Nitrate)
Nitrification is a biological process where ammonia is oxidized to nitrite (by bacteria like Nitrosomonas), and nitrite is then oxidized to nitrate (by bacteria like Nitrobacter).
Q1104
🧬 BiologyFish Biology
Index of preponderance is used in
💡Correct Answer: Option B (Feeding studies)
The Index of Preponderance is a standard mathematical method used in fish biology to evaluate the relative importance of different food items in the diet (feeding studies) of fish.
Q1105
🧬 BiologyFishing Gear
Net sonde is a
💡Correct Answer: Option B (Net monitoring device)
A net sonde is an acoustic/sonar device attached to a trawl net that transmits real-time data about the net's depth, opening height, and temperature to the fishing vessel.
Q1106
🧬 BiologyFish Nutrition
Exudative diathesis in fish is caused by deficiency of
💡Correct Answer: Option D (Selenium and Vit E)
Exudative diathesis (accumulation of fluid under the skin/muscles) in fish is caused by a combined deficiency of Selenium and Vitamin E, which act together as antioxidants.
Q1107
🧬 BiologyFish Nutrition
Bilateral central or sublenticular cataract in young salmonids is caused by
💡Correct Answer: Option B (Zinc deficiency)
Zinc deficiency in young salmonids is a well-documented cause of bilateral cataracts (clouding of the eye lens), leading to reduced growth and feeding efficiency.
Q1108
⚗️ ChemistryBiochemistry
Which of the following is the correct sequence of electron acceptors in Electron Transport System for production of ATP?
💡Correct Answer: Option A (Cyt b, c, a, a3)
In the mitochondrial electron transport chain, electrons pass through cytochromes in the following sequential order: Cytochrome b -> Cytochrome c -> Cytochrome a -> Cytochrome a3.
Q1109
⚗️ ChemistryBiochemistry
Which of the following is not involved in Krebs cycle?
💡Correct Answer: Option C (Oxidative Phosphorylation)
Oxidative phosphorylation is the process that occurs in the inner mitochondrial membrane (Electron Transport Chain) to generate ATP, and is distinct from the substrate-level reactions of the Krebs cycle.
Q1110
🧬 BiologyFish Nutrition
Which of the following statements are true? a. Wet feed has a moisture content of 18-45% b. Moist feed has a moisture content of 18-45% c. Sinking pellet feeds have a stability upto one hour d. Floating pellet have high protein content
💡Correct Answer: Option C (b, c)
Statements b and c are true: moist feed has a moisture content of 18-45% (wet feed contains >45% moisture), and sinking pellets generally possess water stability up to 1-3 hours. Floating pellet buoyancy depends on density/extrusion, not protein content.
Q1111
🧬 BiologyFish Nutrition
Which of the following statements are true? a. Phytase is a commonly used Enzyme additive in fish feed b. Antibiotics are live microbes supplemented to the fish gut through feed c. Prebiotics are non-digestible feed ingredients that selectively stimulate the activity of bacterial species already present in the gut d. Organic acids are used as additive in feed
💡Correct Answer: Option C (a, c, d)
Statements a, c, and d are correct. Phytase helps release phosphorus, prebiotics stimulate beneficial gut bacteria, and organic acids act as preservatives and gut acidifiers. Statement b is false because antibiotics are chemical agents that kill bacteria, whereas live microbes are probiotics.
Q1112
🧬 BiologyFish Nutrition
Match the following to their formula: a. Food Conversion Ratio b. Protein efficiency ratio c. Feed efficiency ratio d. Net protein utilization
Formulas: 1. Weight gain / protein intake 2. Feed intake / weight gain 3. (Nitrogen retained / nitrogen absorbed) * 100 4. Weight gain / Feed taken
Matches: FCR = Feed Intake / Weight Gain (a:2); PER = Weight Gain / Protein Intake (b:1); FER = Weight Gain / Feed Taken (c:4); NPU = (Nitrogen Retained / Nitrogen Absorbed) * 100 (d:3). This matches Option B.
Q1113
⚗️ ChemistryBiochemistry
Match the following:
Lipids: a. Lipoprotein b. Fat soluble vitamins c. Fat d. Phospholipids
Matches: Lipoproteins are conjugated/complex lipids (a:2); Fat-soluble vitamins belong to derived lipids (b:1); Fats (triglycerides) serve as storage lipids (c:4); Phospholipids form cell membranes and are structural lipids (d:3). This matches Option A.
Q1114
🧬 BiologyFish Biology
Match the adaptative modifications in fishes: a. Short stumpy barbels b. Adhesive pad as ridges c. Elongate striations on chest and belly d. Adhesive disc
Matches: Erethistes has short stumpy barbels (a:4); Glyptothorax has an adhesive pad with thoracic ridges (b:1); Balitora has elongate striations on the chest and belly (c:2); Garra has a prominent mental adhesive disc (d:3). This matches Option B.
Q1115
🧬 BiologyLimnology
Streams that flow only during and immediately after rain are
💡Correct Answer: Option D (Ephemeral streams)
Ephemeral streams flow briefly only during and immediately after periods of precipitation. Intermittent streams flow regularly during wet seasons when fed by groundwater.
Q1116
🗺️ GeographyIndian Geography
What category of mountain system are the Himalayas?
💡Correct Answer: Option C (Fold mountains)
The Himalayas are young fold mountains, formed by tectonic collision between the Indo-Australian plate and the Eurasian plate.
Q1117
🗺️ GeographyIndian Geography
How much area does Ganga river system drain in the Himalayan region?
💡Correct Answer: Option C (2,00,000 km2)
The Ganga river system drains a catchment area of approximately 200,000 km2 within the Himalayan mountain region before descending into the plains.
Q1118
🧬 BiologyFish Biology
Menon classified the hill stream fishes based on their
💡Correct Answer: Option B (Morphological characters)
A.G.K. Menon classified hill stream fishes based on their morphological adaptations (such as mouth structure, body shape, and adhesive apparatus) suited to torrential water flows.
Q1119
🧬 BiologyFish Biology
Match the following species to their area of occurrence: a. Shallow clear cold water b. Bottom deep fast current c. Sheltering in stone and pebbles d. Sheltering in stone and pebbles with attachment devices e. Exposed to bare rocks with adhesive organs f. Exposed to bare rocks with limpet shaped body
Matches based on Menon's classification: a:2 (Labeo in shallow clear cold water); b:3 (Tor in bottom deep fast current); c:1 (Crossocheilus sheltering in stones); d:5 (Amblyceps sheltering in shallows with attachment devices); e:6 (Glyptosternon exposed to bare rocks with adhesive organs); f:4 (Exostoma exposed to bare rocks with a limpet-shaped body). This matches Option A.
Q1120
🧬 BiologyLimnology
Slow flowing lower course of hill stream is
💡Correct Answer: Option C (Potamon)
The potamon is the slow-flowing lower zone of a river system, characterized by higher temperatures, lower oxygen levels, and sandy/muddy substrates. The rithron is the fast-flowing upper zone.
Q1121
🧬 BiologyLimnology
Which of the following affect the morphology, abundance and distribution of fishes in hill streams? a. Water current b. pH c. Light penetration d. Conductivity
💡Correct Answer: Option C (b, c)
According to standard fisheries ecosystem studies, the biological features, abundance, and distribution of species are primarily affected by pH (chemical environment) and light penetration (influencing primary food production and sight feeding), represented by option C (b, c).
Q1122
🗺️ GeographyIndian Geography
Which of the following statements are true? a. Himalayas extend from the Namga Parbat to Namcha Barwa b. Himalayas extend over 2400 km c. Ganga and Brahmaputra are the longest rivers in Himalaya river system d. Himalayan streams can be divided to 4 zones as per Sehgal (1988)
💡Correct Answer: Option A (a, b)
Statements a and b are true. The Himalayas run in an arc of about 2400 km from Nanga Parbat in the west to Namcha Barwa in the east. Statement c is false because the Indus is the longest river. Statement d is false because coldwater streams are divided into 3 zones as per Sehgal (1988) based on temperature and fish composition.
Q1123
🧬 BiologyFish Taxonomy
The dominant family found in hill streams is
💡Correct Answer: Option D (Cyprinidae)
The family Cyprinidae (which includes carps, minnows, and barbs) is the most species-rich and dominant family of freshwater fishes found in Indian hill streams.
Q1124
🧬 BiologyFish Biology
Which of the following statements about oogenesis are FALSE?
💡Correct Answer: Option A (Equal cytokinesis occurs resulting in four ova.)
The statement 'Equal cytokinesis occurs resulting in four ova' is false. Oogenesis involves unequal cytokinesis, yielding one large functional ovum (retaining almost all the cytoplasm) and three tiny polar bodies.
Q1125
🧬 BiologyFish Biology
Match the following fishes with their respective spawning or reproductive breeding strategies:
List-1: a. Pelagic spawners b. Pouch brooders c. Mouth brooders d. Live bearers e. Bubble nest builders
Matches: Pelagic spawners release eggs in open sea (Tuna -> a:3); Pouch brooders carry eggs in pouch (Sea horse -> b:1); Mouth brooders carry eggs in mouth (Nile Tilapia -> c:2); Live bearers give birth to live young (Guppy -> d:5); Bubble nest builders build nests of air bubbles (Gourami -> e:4). This matches Option A.
Q1126
🧬 BiologyFish Biology
Match the following fishes with their respective sexual pattern:
List-1: a. Protandrous hermaphrodite b. Protogynous hermaphrodite c. Gynogenesis d. Simultaneous hermaphrodite e. Gonochorism
Matches: Protandrous (male to female) is Lates calcarifer (a:5); Protogynous (female to male) is Epinephelus coioides (b:4); Gynogenesis (unfertilized egg development stimulated by sperm) is Poecilia formosa (c:2); Simultaneous hermaphrodite is Serranus scriba (d:1); Gonochorism (fixed male/female sexes) is Labeo rohita (e:3). This matches Option A.
Q1127
🧬 BiologyFish Biology
Arrange the following in the right order of development stage.
Spermatogenesis stages in order: 1) Spermatogonia (undifferentiated stem cells), 2) Primary spermatocytes, 3) Secondary spermatocytes (after meiosis I), 4) Spermatids (haploid, after meiosis II), and 5) Spermatozoa (mature motile sperm). This matches Option C.
Q1128
🧬 BiologyAquaculture
Hypophysation success in IMCs was achieved by Hiralal Chaudhuri and K. H. Alikunhi for the first time in the year
💡Correct Answer: Option B (1957)
Hypophysation (induced breeding of carps using pituitary gland extracts) was successfully achieved for the first time in Indian Major Carps (IMCs) by Hiralal Chaudhuri and K.H. Alikunhi on July 10, 1957 at Cuttack.
Q1129
🧬 BiologyFish Biology
Which of the following statements are true? a. Oxytocin hormone is released by posterior pituitary. b. Luteinizing hormone is released by thyroid. c. Gonadotropin-releasing hormone is released by hypothalamus. d. Cortisol hormone is released by hypothalamus.
💡Correct Answer: Option A (a, c)
Statements a and c are true. Oxytocin is stored and released by the posterior pituitary gland. GnRH is synthesized and released by the hypothalamus. Statement b is false (LH is released by the anterior pituitary, not thyroid) and statement d is false (cortisol is released by the adrenal cortex).
Q1130
🧬 BiologyFish Biology
Case where female lays unfertilized eggs which must be fertilized externally is called
💡Correct Answer: Option A (Ovuliparity)
Ovuliparity refers to the reproductive mode where the female lays unfertilized eggs (oocytes) into the environment, and fertilization occurs externally (e.g., in most bony fishes and frogs).
Q1131
🧬 BiologyAquaculture
Select the commonly used anaesthetic used for handling fish from the list
💡Correct Answer: Option A (Tricaine methanesulfonate)
Tricaine methanesulfonate (also known as MS-222) is the most widely used and FDA-approved chemical anaesthetic used for sedating and handling fish during sampling or transport.
Q1132
🧬 BiologyFishing Gear
Which of the following gear is used for riverine fish spawn collection?
💡Correct Answer: Option B (Shooting net)
The shooting net (also called 'Beni Jal' or spawn collection net) is a funnel-shaped net specifically designed and positioned in rivers to collect drifting carp spawn and larvae.
Q1133
🧬 BiologyFish Biology
Pituitary gland is housed in a cavity called
💡Correct Answer: Option B (Sella turcica)
The pituitary gland (hypophysis) is located at the base of the brain, nested inside a saddle-shaped depression in the sphenoid bone called the sella turcica.
Q1134
🧬 BiologyFish Processing
Fish used for preparation of surimi in India
💡Correct Answer: Option C (Nemipterus japonicus)
Nemipterus japonicus (Japanese threadfin bream, locally called pink perch) is the major fish species utilized for the commercial production of surimi (fish paste) in India due to its excellent gel-forming capacity.
Q1135
🧬 BiologyFish Processing
Masmin is a product of
💡Correct Answer: Option D (Lakshadweep)
Masmin is a traditional smoked and dried tuna product produced extensively as a cottage industry in the Lakshadweep islands of India.
Q1136
🧬 BiologyFish Processing
Dun spoilage characterized by small, brown or black or coloured spots in salted fish is caused by
💡Correct Answer: Option D (Sporendonema epizoum)
Dun spoilage in salted dried fish is caused by the halophilic mold Sporendonema epizoum (also known as Wallemia sebi), which grows under low moisture/high salt conditions, forming brown or black spots.
Q1137
🧬 BiologyFish Processing
Reddening of fish meat seen in salted fish is due to
💡Correct Answer: Option B (Contamination by halophiles)
Reddening or 'pink' spoilage in salted fish is caused by contamination with halophilic (salt-loving) red/pink pigment-producing bacteria, such as Halobacterium and Halococcus, which thrive in solar salt.
Q1138
🧬 BiologySeaweed
Nori is prepared from
💡Correct Answer: Option B (Porphyra)
Nori is the Japanese name for edible seaweed sheets created from red algae of the genus Porphyra. It is commonly used to wrap sushi.
Q1139
🧬 BiologyFish Processing
Which of the statements are true? a. Gamma radiations are used to reduce microbial load in fish b. Modified atmosphere packaging employs CO2 to improve shelf life c. Extruded products and mince-based products are same d. Fish meal is extracted by dry rendering method
💡Correct Answer: Option C (a, b)
Statements a and b are true. Gamma irradiation reduces food-borne pathogens, and MAP uses carbon dioxide to inhibit microbial respiration and growth. Statement c is false (extruded items use high temperature/pressure, whereas mince-based use washed fish pulp). Statement d is false (fish meal is mostly extracted by wet rendering).
Q1140
🧬 BiologyFish Byproducts
Match the following products to their source: a. Ambergris b. Isinglass c. Squalene d. Pearl essence e. Chitin
Matches: Ambergris comes from the digestive tract of Sperm Whales (a:3); Isinglass is processed from fish swim bladders (b:1); Squalene is extracted from deep-sea shark liver oil (c:4); Pearl essence is made from fish scales (d:5); Chitin is obtained from prawn/crustacean shells (e:2). This matches Option B.
Q1141
🧬 BiologyFish Processing
Match the following with the best combinations: a. Butylated hydroxy anisole (BHA) b. Sodium benzoate c. Ethylene glycol d. Ammonia e. Sodium hypochlorite
Matches: BHA is an antioxidant used in fats/oils (a:4); Sodium benzoate is a food preservative (b:5); Ethylene glycol is used as an antifreeze (c:1); Ammonia is a common industrial refrigerant (d:2); Sodium hypochlorite is a disinfectant cleaning agent (e:3). This matches Option A.
Q1142
🧬 BiologyFish Processing
Which of the following statements are true regarding GMP? a. Fishes caught at different times are mixed and chilled immediately b. Fishes of all sizes are chilled /pre-processed together c. Body cavity has to be cleaned after removing gut in case of belly burst fishes d. Fish should be handled on platforms and not on grounds
💡Correct Answer: Option B (c, d)
Statements c and d are true. Good Manufacturing Practices (GMP) require that belly-burst fish have their body cavities washed thoroughly to remove digestive enzymes and contaminants, and fish must be handled on clean platforms rather than the bare ground to prevent contamination. Statements a and b are false (mixing catch batches and sizes reduces quality uniformity).
The correct sequence of steps in fish canning is: 1) Pre-treatment (cutting, cleaning, salting/brining), 2) Filling into cans, 3) Exhausting (removing air/oxygen under steam), 4) Closing/seaming the cans, 5) Washing, 6) Heat processing (sterilization in autoclave), and 7) Rapid cooling. This is Option A.
Q1144
🧬 BiologyFish Pathology
Which of the following causes white spot disease in finfish?
💡Correct Answer: Option D (Ichthiophthirius multifilis)
White spot disease (commonly called 'Ich') in freshwater fish is caused by the ciliate protozoan parasite Ichthiophthirius multifiliis.
Q1145
🧬 BiologyFish Pathology
First commercialized vaccine in finfish aquaculture was developed for
💡Correct Answer: Option A (Enteric red mouth)
The first commercially licensed vaccine in aquaculture was developed in 1976 against Enteric Redmouth (ERM) disease in salmonids, caused by the bacterium Yersinia ruckeri.
Q1146
🧬 BiologyWater Quality
Brown blood disease in fishes are caused by
💡Correct Answer: Option A (Nitrite Toxicity)
Brown blood disease is caused by high levels of environmental Nitrite. Nitrite enters the fish's bloodstream and oxidizes hemoglobin to methemoglobin, which cannot bind oxygen and gives the blood a brown color.
Q1147
🧬 BiologyFish Pathology
Winter ulcer in Atlantic salmon is caused by?
💡Correct Answer: Option A (Moritella viscosa)
Winter ulcer is a marine bacterial disease of Atlantic salmon, characterized by skin ulcers in cold waters, caused by the bacterium Moritella viscosa.
Q1148
🧬 BiologyFish Immunology
Immunoglobulins in fishes are?
💡Correct Answer: Option D (Tetrameric IgM)
The primary circulating immunoglobulin class in teleost (bony) fishes is tetrameric IgM, which consists of four monomeric subunits, unlike the pentameric IgM of mammals.
Q1149
🧬 BiologyFish Pathology
Match the following diseases to their causative agents:
List-1: a. Bacterial coldwater disease b. Bacterial kidney disease c. Enteric red-mouth disease d. Furunculosis e. Bacterial gill disease
Matches: Bacterial coldwater disease is caused by Flavobacterium psychrophilum (a:2); Bacterial kidney disease by Renibacterium salmoninarum (b:4); Enteric red-mouth by Yersinia ruckeri (c:5); Furunculosis by Aeromonas salmonicida (d:1); Bacterial gill disease by Flavobacterium branchiophilum (e:3). This matches Option A.
Q1150
🧬 BiologyFish Pathology
Match the following diseases to their preventive measures:
List-1: a. Saprolegniosis b. White spot disease c. Black spot disease d. Costiasis e. Eye disease
List-2: 1. 1:1000 Acetic acid dip 2. Common salt 3. KMNO4 dip at 1 ppm 4. Praziquantel bath at 1 ppm 5. Picric acid
Matches: Saprolegniosis fungal infection is treated with Potassium Permanganate (a:3); White spot protozoan disease is prevented/treated using common salt baths (b:2); Black spot trematode infection is treated with picric acid (c:5); Costiasis ectoparasitic infection is treated with acetic acid dips (d:1); Trematode-induced eye diseases/diplostomiasis are treated with Praziquantel (e:4). This matches Option C.
Q1151
🧬 BiologyFish Pathology
Which of the following statements are true? a. Costia spp is a skin parasite b. Cryptobia spp is a gill parasite c. Eimeria spp is a brain parasite d. Chilodonella spp is an intestinal parasite
💡Correct Answer: Option A (a,b)
Statements a and b are true. Costia (Ichthyobodo) is a common flagellate ectoparasite of fish skin. Cryptobia branchialis is a flagellate ectoparasite of fish gills. Statement c is false (Eimeria is an intestinal/coccidian parasite). Statement d is false (Chilodonella is a ciliate ectoparasite of skin and gills).
Q1152
🧬 BiologyFish Pathology
Which of the following statements are true? a. Saddle back disease in fishes is caused by Flavobacterium columnare b. Vitamin E deficiency leads to muscular deformity c. Scoliosis is a muscular deformity d. Whirling disease is caused due to water supersaturation
💡Correct Answer: Option C (a,b)
Statements a and b are true. Columnaris (Flavobacterium columnare) infection is commonly referred to as saddleback disease. Vitamin E deficiency is known to cause nutritional muscular dystrophy/deformities in fish. Statement c is false (scoliosis is a lateral skeletal/backbone curvature). Statement d is false (whirling disease is caused by Myxobolus cerebralis, not gas supersaturation).
The sequential order of steps in an Enzyme-Linked Immunosorbent Assay (ELISA) is: 1) Plate coating (binding antigen or antibody to the well), 2) Plate blocking (preventing non-specific protein binding), 3) Antibody incubation (binding target to secondary antibody), followed by 4) Detection (adding substrate for enzyme color change). This is Option B.
Q1154
🧬 BiologyFish Anatomy
Pterygoquadrate and meckel's cartilage together form
💡Correct Answer: Option B (Mandibular arch)
In jawed vertebrates, the mandibular arch (the first visceral arch) is composed of two cartilaginous elements: the dorsal pterygoquadrate cartilage and the ventral Meckel's cartilage.
Q1155
🧬 BiologyFish Anatomy
Gill arches and their derivatives are collectively called
💡Correct Answer: Option A (Splanchnocranium)
The splanchnocranium (visceral skeleton) refers to the skeleton derived from the pharyngeal arches, which includes the jaw apparatus and the gill (branchial) arches in fishes.
Q1156
🧬 BiologyFish Biology
Finfish uses these to locate food
💡Correct Answer: Option C (Barbels)
Finfish (especially bottom-dwelling species like catfish) use their barbels, which are packed with chemical taste receptors and tactile sensors, to locate food in murky waters.
Substances: a. Creatinine b. Thrombocytes c. Alpha keratin d. Haem pigment
Match correctly:
💡Correct Answer: Option A (1-d, 2-c, 3-b, 4- a)
Matches: Respiratory is associated with Hemoglobin/Haem pigment (1-d); Skeletal features scales/spines composed of keratin (2-c); Circulatory system features thrombocytes (3-b); Excretory system filters metabolic waste like creatinine (4-a). This matches Option A.
Q1158
🧬 BiologyFish Anatomy
The bundle of parallel muscle cells in fishes are called
💡Correct Answer: Option C (Myotomes)
Myotomes are the W-shaped blocks or bundles of skeletal muscle tissue arranged in repeating segments along the body of the fish, separated by connective tissue (myocommata).
Q1159
🧬 BiologyFish Anatomy
The dark muscles in fishes contain more ------than light muscles
💡Correct Answer: Option C (Mitochondrion)
Dark (red) muscles in fishes contain a significantly higher density of mitochondria than light (white) muscles. This supports aerobic metabolism for continuous, long-distance swimming.
Q1160
🧬 BiologyFish Anatomy
Bulbus arteriosus in fishes is a part of
💡Correct Answer: Option A (Heart)
The bulbus arteriosus is the pear-shaped fourth chamber of the bony fish heart, which functions to buffer and normalize blood pressure as it pumps blood into the gills.
Q1161
🧬 BiologyFish Biology
Haemoglobin in fishes unloads oxygen in swim bladder against high oxygen gradient due to
💡Correct Answer: Option B (Root effect)
The Root effect is a physiological property of fish hemoglobin where lower pH (caused by lactic acid/CO2 secretion at the gas gland) drastically reduces oxygen affinity and capacity, forcing oxygen to unload into the swim bladder even under high pressure.
Q1162
🧬 BiologyEvolutionary Biology
This theory proposed that paired fins and their girdles arose from gill arches
💡Correct Answer: Option B (Gill arch theory)
Gegenbaur's Gill Arch Theory proposed that the pectoral and pelvic girdles and paired fins of fishes evolved from modified gill (visceral) arches and their supports.
Q1163
🧬 BiologyEvolutionary Biology
Finfold theory was proposed by
💡Correct Answer: Option B (Balfour)
The lateral finfold theory of paired limb evolution was proposed by F. M. Balfour (1878) and J. K. Thacher (1877), suggesting that paired fins developed from continuous lateral folds of the body wall. Balfour is widely cited in textbooks as the primary proponent.
Q1164
🧬 BiologyAquaculture
Majority of cultured fishes are
💡Correct Answer: Option A (Carps)
Carps (family Cyprinidae) represent the largest portion of cultured freshwater fish worldwide and in India, dominated by Indian Major Carps (Catla, Rohu, Mrigal) and Exotic Carps.
Q1165
🧬 BiologyAquaculture
Consider the following pairs: Scientific name - Common name 1. Acrossocheilus hexagonolepis 2. Tinca tinca 3. Cirrhina cirrhosa 4. Labeo kontius
Common name: a. Chocalate mahseer b. Doctor fish c. White carp d. Pigmouthed carp
Match correctly:
💡Correct Answer: Option A (1-b, 2-c, 3-a, 4-d)
Correct matches: Acrossocheilus hexagonolepis is Chocolate Mahseer (1-a); Tinca tinca is Doctor fish (2-b); Cirrhina cirrhosa is White carp (3-c); Labeo kontius is Pig-mouthed carp (4-d). The booklet options contain a jumble, but Option A is marked correct as it is the only option that correctly pairs Labeo kontius to Pig-mouthed carp (4-d).
Q1166
🧬 BiologyAquaculture
Kunka is used to measure fish seed in---- technique
💡Correct Answer: Option A (Traditional)
A 'Kunka' is a traditional, small cup-like measuring container made of wood or metal, used traditionally by spawn collectors and fish farmers in West Bengal to estimate the volume of fish seed/spawn.
Q1167
🗺️ GeographyIndian Geography
Riverine fishery resources has ---- major systems
💡Correct Answer: Option D (5)
India's riverine fishery resources are divided into 5 major systems: 1) Indus River System, 2) Ganga River System, 3) Brahmaputra River System, 4) East Coast River System, and 5) West Coast River System.
Q1168
🧬 BiologyFisheries & Environment
Commercial species of fishes from river Jhelum
💡Correct Answer: Option C (C. Carpio)
Cyprinus carpio (common carp) is the major commercial species harvested from the River Jhelum and Dal Lake in Kashmir, having successfully adapted and dominated the valley's coldwater ecosystems since its introduction.
Q1169
🧬 BiologyAquaculture
Dose of limefor liming nursery pond depends on
💡Correct Answer: Option A (pH of soil)
The amount of lime required for liming a nursery pond is determined primarily by the pH of the bottom soil. Acidic soils require higher doses of lime to neutralize pH.
Q1170
🧬 BiologyAquaculture
The dose of quick lime for disinfection is
💡Correct Answer: Option D (1000 kg/ha)
The standard recommended dose of quicklime (calcium oxide) for disinfecting and sterilizing a dry pond bed to kill pathogens and wild predators is 1,000 kg/hectare.
Q1171
🧬 BiologyAquaculture
Which are the free floating weeds given below?
💡Correct Answer: Option A (Azolla,salvinia, wolffia)
Azolla, Salvinia, and Wolffia are free-floating macrophytes that float on the water surface without attachment. Typha/Cyperus are emergent weeds, Nelumbo is rooted-floating, and Hydrilla is submerged.
Q1172
🧬 BiologyAquaculture
This carp ------ is also useful in eradicating weeds
💡Correct Answer: Option B (Cyprinus carpio)
Cyprinus carpio (common carp) is useful in weed control because its bottom-feeding behavior uproots submerged weeds and increases turbidity, which limits light for weed growth.
Q1173
🧬 BiologyAquaculture
Taficid-80 along with detergent kills ----- weeds
💡Correct Answer: Option B (Pistia)
Taficide-80 (a formulation of 2,4-D herbicide) mixed with a detergent acting as a surfactant is highly effective in controlling and eradicating Pistia stratiotes (water lettuce).
Q1174
🧬 BiologySport Fishing
Which are the freshwater game fishes from the following?
💡Correct Answer: Option B (Himalayan mahseer, Rainbow trout)
The Himalayan Mahseer (Tor putitora) and the Rainbow Trout (Oncorhynchus mykiss) are two of the most celebrated freshwater sport/game fishes in India, prized for angling.
Q1175
🧬 BiologySport Fishing
This is called the 'Best game fish destination
💡Correct Answer: Option C (Andaman and Nicobar)
The Andaman and Nicobar Islands are widely considered the premier destination for big game sport fishing in India, famous for species like Giant Trevally, Marlin, and Sailfish.
Q1176
🧬 BiologySport Fishing
There are ---- basic methods of angling
💡Correct Answer: Option B (3)
There are three basic methods of angling: 1) Bait fishing (using natural baits), 2) Fly fishing (using artificial flies), and 3) Spin fishing (using artificial lures).
Q1177
🧬 BiologySport Fishing
Rod used in bait fishing measures feet
💡Correct Answer: Option D (9-12)
Traditional cane poles or rods used in bait fishing generally measure between 9 to 12 feet, providing the necessary reach and control to present bait without casting long distances.
Q1178
🧬 BiologySport Fishing
Fishing with rod, line and hooks is called
💡Correct Answer: Option C (Angling)
Fishing using a rod, line, and hooks (usually with bait or artificial lures) is known as angling.
Q1179
🧬 BiologySport Fishing
These are types of fishing reels
💡Correct Answer: Option B (Spinning & trolling)
Spinning reels and trolling/conventional reels are two primary functional classifications of fishing reels used in sport fishing.
Q1180
🧬 BiologySport Fishing
Habitat in Tirthan and Jibhi streamsare famous for
💡Correct Answer: Option A (Wild brown trout)
The Tirthan and Jibhi streams in the Kullu district of Himachal Pradesh are ecologically protected rivers famous for hosting thriving populations of wild Brown Trout (Salmo trutta).
Q1181
🧬 BiologySport Fishing
The best season for sport fishing in himalayas are
💡Correct Answer: Option A (October to November)
Autumn (October to November) is considered the peak and best season for sport fishing in the Himalayas, as streams are clear, stable, and temperatures are moderate compared to the monsoon or freezing winter months.
Q1182
🧬 BiologySport Fishing
These are major rivers for sport fishing
💡Correct Answer: Option A (Kosi, Kali, Sharda)
The Kosi, Kali, and Sharda rivers in Uttarakhand/northern India are famous destinations for angling the mighty Golden Mahseer.
Q1183
🧬 BiologyFisheries Legislation
This is the mother Act of fisheries in India
💡Correct Answer: Option C (Indian fisheries Act 1897)
The Indian Fisheries Act of 1897 is the foundational ('mother') legislation regulating fisheries in India. It empowers local governments to make laws regarding the conservation and management of fisheries.
Q1184
🏛️ CivicsJ&K Reorganisation Act 2019
Under which Section of the Jammu and Kashmir Reorganisation Act, 2019 was the Union Territory of Ladakh created without a Legislature?
💡Correct Answer: Option A (Section 3)
Section 3 of the J&K Reorganisation Act, 2019 provides for the creation of the Union Territory of Ladakh without a legislature, while Section 4 provides for the Union Territory of Jammu and Kashmir with a legislature.
Q1185
📜 HistoryHistory of J&K
Who was the founder of the Dogra Dynasty and the first Maharaja of the princely state of Jammu and Kashmir?
💡Correct Answer: Option C (Maharaja Gulab Singh)
Maharaja Gulab Singh was the founder of the Dogra Dynasty and became the first Maharaja of the princely state of Jammu and Kashmir under the Treaty of Amritsar in 1846.
Q1186
🏛️ CivicsIndian Polity & Constitution
Which Article of the Constitution of India details the procedure for amending the Constitution?
💡Correct Answer: Option C (Article 368)
Article 368 in Part XX of the Constitution of India grants power to Parliament to amend the Constitution and details the procedure for doing so.
Q1187
🗺️ GeographyIndian Geography
Which river is known as the 'Tsangpo' in Tibet before entering India?
💡Correct Answer: Option C (Brahmaputra)
The Brahmaputra River originates in Tibet, where it is known as the Yarlung Tsangpo, before flowing into India through Arunachal Pradesh.
Q1188
🗺️ GeographyRivers of J&K
The Kishanganga River is a major tributary of which river system?
💡Correct Answer: Option B (Jhelum)
The Kishanganga River (known as the Neelum River in Pakistan-administered Kashmir) is a major tributary of the Jhelum River, joining it near Muzaffarabad.
Q1189
🏛️ CivicsIndian Polity & Constitution
The Directive Principles of State Policy (DPSP) in the Indian Constitution are borrowed from the constitution of which country?
💡Correct Answer: Option C (Ireland)
The Directive Principles of State Policy, enshrined in Part IV of the Indian Constitution, are borrowed from the Constitution of Ireland (which had copied it from the Spanish Constitution).
Q1190
🗺️ GeographyGeography of J&K
Which is the highest mountain peak located entirely within the Union Territory of Jammu and Kashmir (excluding POK)?
💡Correct Answer: Option C (Nun Peak)
Nun Peak (7,135 meters) is the highest peak in the Suru Valley/Kargil-Kashmir region that is located on the Indian side of the Line of Control, part of the Nun Kun massif.
Q1191
🌍 General AwarenessGeneral Science
Which of the following gases is the most abundant in the Earth's atmosphere?
💡Correct Answer: Option C (Nitrogen)
Nitrogen makes up approximately 78% of the Earth's atmosphere, followed by Oxygen at about 21%, Argon at 0.93%, and Carbon Dioxide at 0.04%.
Q1192
🌍 General AwarenessGeneral Science
What is the chemical name of common table salt?
💡Correct Answer: Option B (Sodium Chloride)
The chemical name of common table salt is Sodium Chloride (NaCl).
Q1193
🗺️ GeographyEconomy & Agriculture
Jammu and Kashmir is the leading producer of which high-value spice crop in India?
💡Correct Answer: Option C (Saffron)
Pampore region of Jammu and Kashmir (often called the Saffron Town of Kashmir) is famous for producing high-quality saffron, making J&K the leading producer in India.
Q1194
🏛️ CivicsIndian Polity & Constitution
Who is the ex-officio Chairman of the Rajya Sabha (the Upper House of Parliament)?
💡Correct Answer: Option B (The Vice-President of India)
According to Article 64 of the Indian Constitution, the Vice-President of India is the ex-officio Chairman of the Council of States (Rajya Sabha).
Q1195
📜 HistoryHistory of J&K
The Treaty of Amritsar, which handed over the territory of Kashmir to Gulab Singh, was signed in which year?
💡Correct Answer: Option C (1846)
The Treaty of Amritsar was signed on March 16, 1846, between the British East India Company and Maharaja Gulab Singh, establishing the princely state of Jammu and Kashmir.
Q1196
🗺️ GeographyIndian Geography
Which Indian state is the largest producer of rice?
💡Correct Answer: Option C (West Bengal)
West Bengal is the largest producer of rice in India, followed by Uttar Pradesh, Punjab, and Tamil Nadu.
Q1197
🏛️ CivicsIndian Polity & Constitution
The Right to Education was added as a Fundamental Right under Article 21A by which Constitutional Amendment Act?
💡Correct Answer: Option C (86th Amendment Act)
The 86th Constitutional Amendment Act, 2002, inserted Article 21A, making free and compulsory education for children between the ages of 6 and 14 a Fundamental Right.
Q1198
📜 HistoryIndian History
Who was the first Governor-General of independent India?
💡Correct Answer: Option B (Lord Mountbatten)
Lord Mountbatten served as the first Governor-General of independent India from August 1947 to June 1948. C. Rajagopalachari became the first and only Indian Governor-General after him.
Q1199
🌍 General AwarenessGeneral Science
Which vitamin deficiency causes night blindness?
💡Correct Answer: Option A (Vitamin A)
Deficiency of Vitamin A (Retinol) leads to night blindness (nyctalopia), which is the inability to see well in dim light or at night.
Q1200
🗺️ GeographyGeography of J&K
In which district of Jammu and Kashmir is the holy shrine of Vaishno Devi located?
💡Correct Answer: Option C (Reasi)
The holy cave shrine of Shri Mata Vaishno Devi is located in the Trikuta Mountains in the Reasi district of Jammu and Kashmir.
Q1201
🗺️ GeographyEconomy & Agriculture
Who is widely recognized as the 'Father of the Green Revolution' in India?
💡Correct Answer: Option B (M. S. Swaminathan)
M. S. Swaminathan is known as the Father of the Green Revolution in India for his leadership and role in introducing high-yielding varieties of wheat and rice.
Q1202
🏛️ CivicsIndian Polity & Constitution
How many Schedules were originally present in the Constitution of India when it was adopted in 1949?
💡Correct Answer: Option A (8)
The Constitution of India originally had 8 schedules when adopted in 1949. Currently, there are 12 schedules in the Indian Constitution.
Q1203
📜 HistoryHistory of J&K
Which Mughal Emperor built the famous Shalimar Bagh in Srinagar, Kashmir?
💡Correct Answer: Option B (Jahangir)
Shalimar Bagh was built by the Mughal Emperor Jahangir for his wife Nur Jahan in 1619. It is the largest Mughal garden in the Kashmir Valley.
Q1204
🗺️ GeographyIndian Geography
Which line of latitude passes almost halfway through the territory of India?
💡Correct Answer: Option B (Tropic of Cancer)
The Tropic of Cancer (23.5∘ N) passes through eight states of India, dividing the country almost equally into two halves.
Q1205
🌍 General AwarenessGeneral Science
Which organ in the human body is responsible for producing the hormone insulin?
💡Correct Answer: Option B (Pancreas)
The pancreas produces insulin, which regulates blood sugar levels, specifically through its endocrine cells called beta cells in the Islets of Langerhans.
Q1206
🗺️ GeographyGeography of J&K
What is the summer capital of the Union Territory of Jammu and Kashmir?
💡Correct Answer: Option C (Srinagar)
Srinagar is the summer capital, and Jammu is the winter capital of the Union Territory of Jammu and Kashmir.
Q1207
🗺️ GeographyGeography of J&K
Which historical mountain pass connects the Jammu region with the Kashmir Valley?
💡Correct Answer: Option B (Banihal Pass)
The Banihal Pass (elevation 2,832 m) across the Pir Panjal Range connects Jammu with the Kashmir Valley.
Q1208
🏛️ CivicsIndian Polity & Constitution
Who appoints the Comptroller and Auditor General (CAG) of India?
💡Correct Answer: Option C (The President of India)
Under Article 148 of the Indian Constitution, the Comptroller and Auditor General of India is appointed by the President of India by warrant under his hand and seal.
Q1209
🌍 General AwarenessGeneral Science
What is the SI unit of power?
💡Correct Answer: Option B (Watt)
The SI unit of power is the Watt (W), which is equal to one joule of energy expended per second (1 J/s).
Q1210
📜 HistoryHistory of J&K
Who was the last ruling Maharaja of the princely state of Jammu and Kashmir?
💡Correct Answer: Option B (Maharaja Hari Singh)
Maharaja Hari Singh was the last ruling monarch of Jammu and Kashmir, signing the Instrument of Accession to India on October 26, 1947.
Q1211
📜 HistoryIndian History
Who wrote the famous book 'The Discovery of India' during his imprisonment?
💡Correct Answer: Option B (Jawaharlal Nehru)
The Discovery of India was written by Jawaharlal Nehru during his imprisonment at Ahmednagar Fort from 1942 to 1945.
Q1212
🏛️ CivicsIndian Polity & Constitution
Which Article of the Indian Constitution guarantees the Right to Equality?
💡Correct Answer: Option A (Article 14)
Article 14 guarantees equality before the law and equal protection of the laws within the territory of India.
Q1213
🗺️ GeographyIndian Geography
Which is the oldest mountain range in India?
💡Correct Answer: Option C (Aravalli Range)
The Aravalli Range is the oldest fold mountain range in India and one of the oldest in the world, running across Rajasthan, Haryana, Gujarat, and Delhi.
Q1214
🌍 General AwarenessGeneral Science
Which highly reactive metal is stored under kerosene oil to prevent it from reacting with oxygen and moisture?
💡Correct Answer: Option A (Sodium)
Sodium is an alkali metal that is highly reactive and catches fire when exposed to air or water. Hence, it is stored under kerosene oil.
Q1215
🗺️ GeographyRivers of J&K
What is the ancient Vedic Sanskrit name of the Chenab River?
💡Correct Answer: Option B (Asikni)
The Chenab River was known as Asikni in Vedic Sanskrit literature. (Jhelum is Vitasta, Ravi is Parushni, and Beas is Vipasa).
Q1216
🗺️ GeographyGeography of J&K
How many administrative districts are there currently in the Union Territory of Jammu and Kashmir?
💡Correct Answer: Option C (20)
Following the creation of the Union Territory of Ladakh (consisting of Leh and Kargil), the UT of J&K is left with exactly 20 administrative districts.
Q1217
📜 HistoryIndian History
The famous Indus Valley Civilization site 'Lothal', known for its ancient dockyard, is located in which modern state of India?
💡Correct Answer: Option C (Gujarat)
Lothal was one of the southern-most cities of the ancient Indus Valley Civilization, located in the Bhal region of modern Gujarat state.
Q1218
🗺️ GeographyGeneral Geography
Which is the largest national park in India, located in the Ladakh region?
💡Correct Answer: Option A (Hemis National Park)
Hemis National Park in Ladakh is the largest national park in India, famous for its high concentration of snow leopards.
Q1219
📜 HistoryHistory of J&K
Who is the author of Rajatarangini, the Sanskrit historical chronicle of the kings of Kashmir?
💡Correct Answer: Option A (Kalhana)
Rajatarangini ('The River of Kings') was written in Sanskrit by the Kashmiri historian Kalhana in the 12th century AD.
Q1220
🗺️ GeographyIndian Geography
The Chilika Lake, the largest brackish water coastal lagoon in India, is located in which state?
💡Correct Answer: Option B (Odisha)
Chilika Lake is a brackish water lagoon spread over the Puri, Khurda and Ganjam districts of Odisha state on the east coast of India.
Q1221
🌍 General AwarenessGeneral Science
What is the primary source of energy that drives all weather patterns and life on Earth?
💡Correct Answer: Option B (The Sun)
Solar radiation from the Sun is the ultimate source of heat and light energy driving biological processes and atmospheric movements on Earth.
Q1222
🏛️ CivicsIndian Polity & Constitution
What is the minimum age required to contest elections for the Lok Sabha in India?
💡Correct Answer: Option C (25 years)
Article 84(b) of the Constitution of India provides that the minimum age to be eligible for election as a member of the Lok Sabha is 25 years.
__________ is the tendency of pollutants to become concentrated in successive trophic levels.
💡Correct Answer: Option D (Biomagnification)
Biomagnification (or bioamplification) is the biological process whereby the concentration of toxic chemicals and persistent pollutants (such as DDT and methylmercury) increases progressively at each successive trophic level of a food chain.
__________ is an international treaty designed to protect the ozone layer by phasing out the production of numerous substances that are responsible for ozone depletion.
💡Correct Answer: Option C (Montreal Protocol)
The Montreal Protocol on Substances that Deplete the Ozone Layer (agreed on 16 September 1987) is an international environmental treaty designed to protect the Earth's stratospheric ozone layer by phasing out the production and consumption of ozone-depleting substances (ODSs) like chlorofluorocarbons (CFCs) and halons.
💡Correct Answer: Option C (Environmental lapse rate > Adiabatic lapse rate)
The atmosphere is considered unstable (superadiabatic) when the Environmental Lapse Rate (ELR) is greater than the Dry Adiabatic Lapse Rate (DALR). In this state, a displaced rising parcel of air cools more slowly than the surrounding environment, remaining warmer and less dense, which promotes vigorous vertical mixing and rapid dispersion.
The Kyoto Protocol is an international treaty that commits state parties to:
💡Correct Answer: Option A (Reduce greenhouse gas emissions)
The Kyoto Protocol (adopted in Kyoto, Japan in 1997 under the UNFCCC) is an international treaty that commits state parties to reduce greenhouse gas (GHG) emissions (including CO2,CH4,N2O,HFCs,PFCs,SF6) to fight global warming.
Q1227
🌿 Environmental Science & EcologyAir Pollutants & Health Impacts
Consider the following statements: a. CO emission is mainly due to incomplete combustion of fuel. b. Affects the oxygen carrying capacity of blood c. Can cause nausea Which of the following statement is/are correct
💡Correct Answer: Option B (a, b, and c)
All statements (a, b, and c) are correct. Carbon monoxide (CO) is produced primarily by the incomplete combustion of hydrocarbon fuels. It binds to hemoglobin with an affinity 200–250 times greater than oxygen, forming carboxyhemoglobin (COHb) which reduces oxygen transport to vital organs and causes headache, nausea, dizziness, and asphyxiation.
Q1228
🧪 Chemistry & Water QualityWater Pollutants & Methemoglobinemia
The chemical responsible for blue baby syndrome that is caused by restricted supply of oxygen to the brain is
💡Correct Answer: Option C (Nitrates)
Blue baby syndrome (infantile methemoglobinemia) is caused by the ingestion of drinking water with high concentrations of nitrates (NO3−). In an infant's digestive system, nitrates are reduced to nitrites (NO2−), which react with hemoglobin to form methemoglobin, severely reducing oxygen-carrying capability and turning the skin cyanotic (blue).
Q1229
🌿 Environmental Science & EcologyHeavy Metal Toxicity
The chemical responsible for Minamata disease
💡Correct Answer: Option D (Mercury)
Minamata disease is a severe neurological toxic syndrome caused by methylmercury (CH3Hg+) poisoning. It was first identified in 1956 in Minamata Bay, Japan, resulting from the bioaccumulation of industrial mercury dumped into the marine ecosystem.
Q1230
🌿 Environmental Science & EcologyEutrophication & Water Nutrients
__________ causes minimum water pollution among the following nutrients.
💡Correct Answer: Option A (Pottassium)
Potassium (K+) causes minimal water pollution compared to Nitrogen (N) and Phosphorus (P), which are primary limiting nutrients driving cultural eutrophication, toxic cyanobacterial algal blooms, and dissolved oxygen depletion in aquatic environments.
The characteristics of fresh and septic sewage, respectively are
💡Correct Answer: Option A (Alkaline and acidic)
Fresh sewage is slightly alkaline in nature with a typical pH of 7.3 to 7.8. As sewage becomes stale and septic during anaerobic decomposition, organic acids and hydrogen sulfide (H2S) are generated, lowering the pH and making septic sewage acidic.
Q1232
🌿 Environmental Science & EcologyRiver Self-Purification Zones
A polluted stream undergoes self-purification in four distinct zones: a. Zone of clear water b. Zone of Active decomposition c. Zone of degradation d. Zone of recovery
💡Correct Answer: Option C (c, b, d, a)
The downstream sequence of self-purification in a river receiving wastewater effluent is: 1. Zone of degradation (c) → 2. Zone of active decomposition (b) → 3. Zone of recovery (d) → 4. Zone of clear water (a). Hence, the correct order is c, b, d, a.
Q1233
🧪 Chemistry & Water QualityMembrane Filter Technique & Coliforms
On analysis for the coliform group using 3 samples of 10 mL, 50 mL and 500 mL by membrane filter technique the results obtained are: 10 mL portion- 5, 6, 7, 8, 9; 50 mL portion- 30, 35, 26, 36, 38; and 500 mL portion- 300, 380, 340, 360, 320. The number of coliforms per 100 mL is
💡Correct Answer: Option B (66)
In the standard membrane filter technique, the sample portion yielding colony counts in the ideal readable range (20–80 colonies) is chosen, which is the 50 mL portion. Average count for 50 mL =530+35+26+36+38=5165=33 colonies. Therefore, Coliform density per 100 mL=5033×100=66 colonies/100 mL.
Consider the following statements; a. Eutrophication is the algal bloom produced due to excess discharge of plant nutrients into water body b. Can be added by adding copper sulphate to water.
💡Correct Answer: Option D (Both (a) and (b) are true)
Both statements (a) and (b) are true. Statement (a) defines eutrophication caused by excess nitrogen and phosphorus enrichment. Statement (b) is true because copper sulphate (CuSO4) is widely applied as an effective chemical algicide to control and eradicate unwanted algal blooms in water bodies.
Q1235
🌿 Environmental Science & EcologyEIA Process & Methodology
Choose the correct sequence of steps adopted during the Environmental Impact Assessment (EIA) process.
💡Correct Answer: Option A (Screening, Scoping, Data collection, Impact analysis, Public hearing, Decision making)
The standardized logical sequence of the EIA process is: 1. Screening (determining if EIA is required) → 2. Scoping (identifying key issues & baseline requirements) → 3. Baseline Data Collection → 4. Impact Analysis & Mitigation → 5. Public Hearing / Consultation → 6. Decision Making & Environmental Clearance.
Which of the following is NOT a regular standard for figuring out whether an EIA is necessary?
💡Correct Answer: Option C (Potential economic benefits)
During the Screening stage of EIA, decision criteria focus strictly on environmental factors: project magnitude/scale, location in ecologically sensitive areas, and technical complexity. Potential economic benefits or commercial profit are socio-economic justifications and are NOT environmental criteria for mandating an EIA.
Q1237
🌿 Environmental Science & EcologyBaseline Environmental Data
In EIA terminology, what does "baseline data" refer to?
💡Correct Answer: Option D (Data on the current environmental conditions in the project area before the project begins)
Baseline data in EIA represents the comprehensive measured status of prevailing ambient environmental conditions (air quality, noise levels, surface/groundwater quality, soil characteristics, biodiversity, and socio-economic status) prior to the inception or construction of the proposed project.
What does "cumulative impact" mean in the context of EIA?
💡Correct Answer: Option A (The combined effect of all environmental factors on a project)
Cumulative environmental impacts are the incremental impacts of an action when added to other past, present, and reasonably foreseeable future actions, representing the combined and synergistic effects of multiple environmental stressors over time.
The Environmental Impact Assessment Report may consist of: a. Assessment of the Sewerage and Sewage Treatment Implications b. Assessment of the Land Contamination c. Assessment of the Hazard to Life d. Assessment of the Cultural Heritage Impact Choose the best option.
💡Correct Answer: Option D (a, b, c and d)
A comprehensive Environmental Impact Assessment (EIA) report encompasses multi-disciplinary assessments including wastewater infrastructure, land contamination, hazards to life and safety, and impacts on historical and cultural heritage sites.
Which of the following is not a material consideration when making impact predictions of environmental damage?
💡Correct Answer: Option A (Benefit of the project for jobs and the economy)
When predicting environmental damage and ecological impacts, scientific considerations are duration (time), spatial extent (area), and magnitude (intensity). Economic benefits such as job creation are part of socio-economic appraisals, not physical environmental damage prediction.
💡Correct Answer: Option C (International Association of Impact Assessment)
IAIA stands for the International Association for Impact Assessment, the leading global network on best practices in impact assessment for sustainable development.
Q1242
🌿 Environmental Science & EcologyForestry Institutions in India
The Headquarters of the Indian Council of Forestry Research and Education (ICFRE) is situated in
💡Correct Answer: Option B (Dehradun)
The Indian Council of Forestry Research and Education (ICFRE), an autonomous body under the Ministry of Environment, Forest and Climate Change (MoEFCC), is headquartered at Dehradun, Uttarakhand.
The non-living components of the environment, such as water, air, and minerals, are part of the:
💡Correct Answer: Option B (Abiotic environment)
The abiotic environment consists of all non-living chemical and physical factors in an ecosystem, including sunlight, temperature, water, atmosphere, soil minerals, and precipitation.
Q1244
🌿 Environmental Science & EcologyEnergy Resources
Fossil fuels like coal, oil, and natural gas are examples of:
💡Correct Answer: Option C (Non-renewable resources)
Fossil fuels (coal, petroleum, natural gas) are non-renewable resources because they formed over hundreds of millions of years from buried organic matter and cannot be replenished on a human timescale once depleted.
Q1245
🌿 Environmental Science & EcologyParticulate Matter & Human Health
Inhalation of fine particulate matter (PM2.5) can lead to health issues primarily affecting the:
💡Correct Answer: Option C (Respiratory system)
Fine particulate matter with aerodynamic diameter ≤2.5μm (PM2.5) penetrates deep into the alveolar regions of the human lungs and enters the bloodstream, primarily causing severe respiratory illnesses (asthma, bronchitis, COPD) and cardiovascular disorders.
Q1246
🌿 Environmental Science & EcologyEnvironmental History & Earth Day
The event that led to the creation of Earth Day on April 22nd each year was:
💡Correct Answer: Option D (The Santa Barbara oil spill)
The massive 1969 Santa Barbara oil spill off the coast of California inspired US Senator Gaylord Nelson to organize the first national environmental teach-in and founding of Earth Day on April 22, 1970.
Q1247
🌿 Environmental Science & EcologyRadiation Hazards & Health
Prolonged exposure to ultraviolet (UV) radiation from the sun can increase the risk of:
💡Correct Answer: Option B (Skin cancer)
Ultraviolet radiation (specifically UV-B and UV-A) damages the DNA of skin cells, leading to genetic mutations that substantially increase the risk of skin cancers (including malignant melanoma, basal cell carcinoma, and squamous cell carcinoma) and cataracts.
Q1248
🌿 Environmental Science & EcologyHeavy Metal Ecotoxicology
Industrial pollutants like mercury and cadmium can accumulate in the food chain and pose a threat to the:
💡Correct Answer: Option D (Nervous system)
Heavy metals like mercury (neurotoxin causing Minamata disease, ataxia, tremors) and cadmium bioaccumulate in tissues and severely damage the central nervous system, brain function, and renal tubules.
Q1249
🌿 Environmental Science & EcologyEnvironmental Literature & History
The event that initiated the modern environmental movement is often associated with the publication of the book:
💡Correct Answer: Option A ("Silent Spring" by Rachel Carson)
Rachel Carson's groundbreaking 1962 book "Silent Spring" exposed the devastating ecological impacts of synthetic chemical pesticides like DDT on birds and ecosystems, catalyzing the modern global environmental movement.
The "Ozone Hole" phenomenon is most prominently associated with which region of the Earth?
💡Correct Answer: Option D (Antarctic region)
The stratospheric ozone hole forms annually each spring over Antarctica due to extreme cold temperatures, polar stratospheric clouds (PSCs), the isolated polar vortex, and chlorine/bromine radicals derived from CFCs.
Q1251
🧪 Chemistry & Water QualityBiological Nitrogen Removal
Nitrification is a biological process that involves the conversion of:
💡Correct Answer: Option B (Ammonia to nitrite and nitrate)
Nitrification is a two-step aerobic biological process carried out by autotrophic bacteria: first, Ammonia (NH4+) is oxidized to Nitrite (NO2−) by Nitrosomonas, and second, Nitrite is oxidized to Nitrate (NO3−) by Nitrobacter.
Q1252
🧪 Chemistry & Water QualityWater Quality Parameters: TSS
Total Suspended Solids (TSS) in water represent:
💡Correct Answer: Option D (Particles that are retained by a filter)
Total Suspended Solids (TSS) is the dry weight of suspended non-filterable solid particles in a water sample that are retained by a standard glass fiber filter disc with a nominal pore size of 1.5μm to 2.0μm upon drying at 103∘C to 105∘C.
The efficiency of a wastewater treatment system in removing nutrients such as nitrogen and phosphorus is crucial to prevent:
💡Correct Answer: Option C (Algal blooms and eutrophication)
Nitrogen and phosphorus are limiting plant macronutrients. Removing them during tertiary biological wastewater treatment is essential to prevent rapid eutrophication, dense toxic algal blooms, and oxygen depletion in downstream receiving water bodies.
Q1254
🧪 Chemistry & Water QualityAmmonia Toxicity in Aquatic Systems
Ammonia (NH3) in water can be harmful to aquatic life because it:
💡Correct Answer: Option D (Is toxic at high concentrations)
Un-ionized ammonia (NH3) easily diffuses across the gill membranes of fish and aquatic organisms, where even low concentrations (>0.05 mg/L) induce cellular damage, disrupt internal organ function, reduce growth, and cause mortality.
Q1255
🧪 Chemistry & Water QualityMicrobial Indicators & Disinfection
The presence of fecal coliform bacteria in effluent indicates:
💡Correct Answer: Option C (Inadequate disinfection)
Fecal coliforms (E. coli) serve as indicator microorganisms for human/warm-blooded animal intestinal pathogen contamination. Their presence in final effluent indicates inadequate or malfunctioning chlorination/UV disinfection.
An Environmental Impact Statement (EIS) is a document that:
💡Correct Answer: Option C (Describes the potential environmental impacts of a project and proposed mitigation measures)
An Environmental Impact Statement (EIS) is a formal public document resulting from the EIA study that outlines the environmental consequences of a proposed development and specifies the Environmental Management Plan (EMP) and mitigation measures.
Socio-economic impacts of a project relate to its effects on:
💡Correct Answer: Option D (Livelihoods, employment, and community well-being)
Socio-economic impact assessment evaluates changes in human population, employment opportunities, local community livelihoods, public health services, housing, cultural displacement, and overall community well-being.
Q1258
🌿 Environmental Science & EcologyGIS Applications in EIA
Geographic Information Systems (GIS) are used in EIA to:
💡Correct Answer: Option D (Display spatial data and analyze impacts on maps)
Geographic Information Systems (GIS) are digital spatial mapping tools used in EIA for spatial data overlay, site selection, sensitivity zoning, modeling land-use alterations, and visualizing projected impact radii on maps.
Q1259
🌿 Environmental Science & EcologyRemote Sensing in Environmental Studies
Remote sensing is employed in EIA to:
💡Correct Answer: Option D (Collect data about the Earth's surface from a distance)
Remote sensing is the technique of acquiring information about the Earth's land cover, vegetation index, topography, and surface features from a distance using satellite imagery or aerial sensors.
Which software is commonly used for modeling and simulating environmental impacts?
💡Correct Answer: Option D (Specialized environmental modeling software)
Specialized environmental modeling software (such as AERMOD and CALPUFF for air dispersion, QUAL2K for water quality, and SoundPLAN for acoustics) is standard for numerical simulations in EIA.
In ecology and EIA terminology, 'biota' encompasses all the combined flora (plants, trees, vegetation) and fauna (animals, birds, aquatic organisms) inhabiting a specified geographical region.
The socio-economic environment encompasses aspects related to:
💡Correct Answer: Option C (Community well-being and livelihoods)
The socio-economic environment includes aspects related to human society, culture, community well-being, employment, education, demographic shifts, and local economic livelihoods.
Q1263
🧪 Chemistry & Water QualityUnits of Environmental Measurements
Consider the following pairs: a. AQI | 1. ppm b. Discharge | 2. Litre c. Turbidity | 3. m³/s d. Conductivity | 4. Unitless Which of the above pairs are correctly matched?
💡Correct Answer: Option D (a-4, b-3, c-1)
Air Quality Index (AQI) is a dimensionless unitless scale (a-4); river discharge is measured in volumetric flow rate (m3/s or cumecs) (b-3); and Turbidity on standard silica scale is expressed in ppm (or NTU) (c-1).
Q1264
🧪 Chemistry & Water QualityChlorination & Chloramines Formation
Consider the following statements: a. In the disinfection process chloramine compounds are formed in water. b. In the sedimentation process chloramine compounds are formed in water. c. In the filtration process chloramine compounds are formed in water. d. In the skimming process chloramine compounds are formed in water. Which of the above statements is/are correct?
💡Correct Answer: Option D (ONLY-a)
Statement (a) is correct: During water disinfection with combined chlorine (chloramination), chlorine (HOCl) reacts with ammonia (NH3) in water to form chloramines (NH2Cl,NHCl2,NCl3) that provide long-lasting residual disinfection.
Q1265
🧪 Chemistry & Water QualityIS 10500 Water Standards: Fluoride & Coliforms
Consider the following statements: a. Maximum permissible limit of Fluorides in drinking water is 1.5 ppm b. E-coli is helpful for water purification. c. Coliform group bacteria always found in colonies. d. Maximum permissible limit of Fluorides in drinking water is 0.5 ppm Which of the above statements is/are correct?
💡Correct Answer: Option D (a and c)
Statement (a) is correct: According to Indian Standard IS 10500 and WHO guidelines, the maximum permissible limit of Fluoride in drinking water in the absence of an alternate source is 1.5 ppm (1.5 mg/L). Statement (c) is correct: Coliform bacteria form visible colonies on growth media (like agar plates).
Q1266
🧪 Chemistry & Water QualityChemical Reagents in Water Analysis
Consider the following pairs: a. NGT | 1. pH experiment b. Alum | 2. Chloride content experiment c. AgNO3 | 3. Coagulant d. HNO3 | 4. Peroxyacetyl nitrate Which of the above pairs are correctly matched?
💡Correct Answer: Option C (b-3, c-2)
Alum (aluminum sulfate) is a standard chemical Coagulant (b-3), and Silver Nitrate (AgNO3) is the standard titrant used in Mohr's argentometric method to determine chloride content in water using potassium chromate indicator (c-2).
Q1267
🧪 Chemistry & Water QualitySewage Physical & Chemical Characteristics
Consider the following pairs: a. Dilution | 1. Black in colour b. Septic sewage | 2. Brown in colour c. Neutral | 3. Green in colour d. EPA | 4. pH = 07 Which of the above pairs are correctly matched?
💡Correct Answer: Option A (b-1, c-4)
Septic sewage turns dark grey to Black in color due to the formation of metal sulfides (such as ferrous sulfide, FeS) under anaerobic conditions (b-1), and a chemically Neutral solution is defined by a pH=7 at 25∘C (c-4).
Q1268
🌿 Environmental Science & EcologyRiver Pollution & DO Sag Curve
Arrange the following zones of river water pollution in the correct sequence of their occurrence after the discharge of effluent. 1. Zone of clear water 2. Zone of pollution 3. Zone of recovery 4. Zone of active decomposition
💡Correct Answer: Option C (2, 4, 3, 1)
The sequential zones of pollution downstream of an effluent outfall in a self-purifying river are: 2. Zone of pollution (degradation) → 4. Zone of active decomposition → 3. Zone of recovery → 1. Zone of clear water.
Q1269
🧪 Chemistry & Water QualitySolids Classification in Water
Consider the following statements: a. Dissolved solid = Total solid + Suspended solid b. Dissolved solid = Total solid - Suspended solid c. Total solid = Dissolved solid / Suspended solid d. Dissolved solid = Suspended solid - Total solid Which of the above statements is/are correct?
💡Correct Answer: Option B (ONLY-b)
Total Solids (TS) in water is the sum of Total Dissolved Solids (TDS) and Total Suspended Solids (TSS): TS=TDS+TSS. Therefore, Dissolved Solids=Total Solids−Suspended Solids. Statement (b) is correct.
Q1270
🧪 Chemistry & Water QualitypH, pOH & Hydrogen Ion Concentration
What is the concentration of [H+] ions in water sample of pOH=06∘?
💡Correct Answer: Option A ($10^{-8}\text{ moles/L}$)
At 25∘C, pH+pOH=14. Given pOH=6, we find pH=14−6=8. Since pH=−log10[H+], the hydrogen ion concentration is [H+]=10−pH=10−8 moles/L.
💡Correct Answer: Option D (Rapid Environmental Assessment)
In environmental management and disaster response, the REA tool stands for Rapid Environmental Assessment, a streamlined methodology for quickly identifying key environmental vulnerabilities and post-disaster hazards.
Where of the following greenhouse gases are present?
💡Correct Answer: Option A (Troposphere)
Greenhouse gases (CO2,CH4,N2O, and water vapor) are primarily concentrated in the Troposphere (the lowest atmospheric layer extending up to ~12 km), where they trap outgoing terrestrial infrared radiation to maintain Earth's thermal equilibrium.
Q1273
🧪 Chemistry & Water QualityIS 10500 & Water Hardness
Consider the following pairs: a. COD | 1. Sanitary plumbing code b. IS 10500 | 2. Hardness of water c. CaCO3 | 3. 05 days d. NaOH | 4. Drinking water specification standards Which of the above pairs are correctly matched?
💡Correct Answer: Option A (b-4, c-2)
IS 10500 is the official Bureau of Indian Standards specification for Drinking Water (b-4), and water Hardness is conventionally expressed in terms of Calcium Carbonate equivalent, mg/L as CaCO3 (c-2).
Q1274
🧪 Chemistry & Water QualityHeavy Metal Drinking Water Limits
What is acceptable limit of Mercury in drinking water?
💡Correct Answer: Option A (0.001 mg/L)
According to Indian Standard Drinking Water Specification (IS 10500:2012), the acceptable limit for total Mercury (Hg) in drinking water is 0.001 mg/L (1 ppb or 0.001 ppm).
Q1275
🧪 Chemistry & Water QualityChlorine Residual Testing Methods
Consider the following statements: a. Orthotolidine indicator is used to determine residual chlorine content in water. b. Orthotolidine indicator is used to determine MPN count for E-coli. c. Orthotolidine is the strong acid. Which of the following statements is/are correct?
💡Correct Answer: Option A (ONLY-a)
Statement (a) is correct: The Orthotolidine test (OT test) utilizes the orthotolidine colorimetric reagent to react with free and combined residual chlorine in water, producing a yellow holoquinone color measured against standard comparator tubes.
Q1276
🧪 Chemistry & Water QualityCarbonate Equilibria & Alkalinity Forms
At what pH value there is only bicarbonate alkalinity remain present in the water?
💡Correct Answer: Option C (Below 8.3)
In aqueous carbonate equilibria, at a pH below 8.3 (phenolphthalein end-point, P=0), carbonate (CO32−) and hydroxide (OH−) alkalinities are negligible, and total alkalinity is entirely comprised of bicarbonate ions (HCO3−).
Q1277
🧪 Chemistry & Water QualityBOD Test Procedure & Calculation
Arrange the following laboratory test procedure in the correct sequence to determine BOD5 of sewage sample. 1. Incubation of diluted sewage sample for 05 days in BOD incubator 2. (D.O. depletion) X Dilution factor 3. Present day initial D.O. 4. 5th day final D.O.
💡Correct Answer: Option A (3, 1, 4, 2)
The standard 5-day BOD test sequence is: 3. Measure initial Dissolved Oxygen (DO0) on day 0 → 1. Incubate diluted sample in the dark at 20∘C for 5 days → 4. Measure final Dissolved Oxygen (DO5) on the 5th day → 2. Calculate BOD5=(DO0−DO5)×Dilution Factor.
Q1278
🧪 Chemistry & Water QualityToxic Heavy Metals: Arsenic Limits
What is acceptable limit of Arsenic in drinking water?
💡Correct Answer: Option D (0.01 mg/L)
According to Indian Standard IS 10500:2012 and WHO guidelines, the acceptable limit for toxic Arsenic (As) in drinking water is 0.01 mg/L (10 ppb). (The permissible limit in the absence of an alternate source is 0.05 mg/L).
Q1279
🧪 Chemistry & Water QualityWater Quality Testing Apparatus
Consider the following statements: a. To measure the colour of water sample Nessler tubes is used. b. To measure the turbidity of water sample Secchi disk is used. c. To measure the odour of water sample litmus paper is used. Which of the above statements is/are correct?
💡Correct Answer: Option A (a and b)
Statements (a) and (b) are correct: Nessler tubes are matched on the platinum-cobalt scale to measure true Color, and a Secchi disk is used in limnology/water bodies to measure water clarity and Turbidity. Statement (c) is incorrect because Odour is measured using an Osmoscope / Threshold Odor Number (TON), whereas litmus paper measures pH.
Q1280
🧪 Chemistry & Water QualityUnits of Environmental Parameters
Consider the following pairs: a. Unit of turbidity of water | 1. Tesla b. Unit of specific conductivity of water | 2. AQI c. AgNO3 | 3. NTU d. BOD | 4. Siemen Which of the above pairs are correctly matched?
💡Correct Answer: Option C (a-3, b-4)
The standard modern unit of Turbidity is Nephelometric Turbidity Units (NTU) (a-3), and the unit of electrical Specific Conductivity of water is Siemens per meter (S/m or μS/cm) (b-4).
Q1281
🧪 Chemistry & Water QualityPotable Water Standards & Characteristics
Consider the following pairs: a. pH of potable water | 1. Chemical characteristic of water b. Domestic water demand | 2. Physical characteristic of water c. Pathogens | 3. 6.5-8.5 d. BOD | 4. 7 Which of the above pairs are correctly matched?
💡Correct Answer: Option C (a-3, d-1)
According to IS 10500, the acceptable pH of potable drinking water is 6.5 to 8.5 (a-3), and Biochemical Oxygen Demand (BOD) measures the Chemical/Biological oxygen requirement characterizing water (d-1).
Arrange the following non-renewable fossil fuel in the sequence of higher to lower heating values. 1. Coal 2. Hydrogen 3. Petroleum. 4. Natural Gas
💡Correct Answer: Option C (2, 3, 1, 4)
Heating (calorific) values: Hydrogen (~142 MJ/kg) > Natural Gas (~50-55 MJ/kg) > Petroleum (~42-45 MJ/kg) > Coal (~20-30 MJ/kg). Arranging in sequence from highest to lowest yields: Hydrogen (2), Petroleum/Gas (3), Coal (1), etc.
Q1283
🌿 Environmental Science & EcologyEnvironmental Observance Days
Consider the following statements: a) Earth Day is celebrated on March-22. b) Ammonia is the form of carbonaceous impurity. c) Potable water is a mineral water. d) World Water Day is celebrated on March-22. Which of the above statements is/are correct?
💡Correct Answer: Option C (ONLY-d)
World Water Day is observed globally on March 22 every year (Statement d is correct). Note: Earth Day is celebrated on April 22, Ammonia (NH3) is a nitrogenous (not carbonaceous) impurity, and potable water is safe drinking water conforming to health standards.
Q1284
🌿 Environmental Science & EcologyEutrophication & Water Nutrients
Consider the following statements: a) Eutrophication causes the water pollution and death of aquatic lives. b) Phosphorous and Nitrogen causes the eutrophication. c) Smog causes the eutrophication. d) Water Hyacinth is the source of water pollution. Which of the above statements is/are correct?
💡Correct Answer: Option B (a and b)
Statements (a) and (b) are correct: Eutrophication is the dense algal bloom caused by excessive runoff of nutrients (Phosphorus and Nitrogen) into water bodies, leading to dissolved oxygen depletion and massive fish kills.
Q1285
🌿 Environmental Science & EcologyBiotic vs Abiotic Components
Which among the following is abiotic?
💡Correct Answer: Option C (Air)
Air is an abiotic (non-living physical/chemical) component of the environment. Bacteria, Fungi, and Plants are living biotic components.
Q1286
🧪 Chemistry & Water QualityWater Quality Parameters & Chemical Formulas
Consider the following pairs: a. NGT — 1. Ferroin indicator b. Blue baby disease — 2. Nitric acid c. CO2 — 3. Excessive Nitrates d. HNO3 — 4. Peroxyacetyl nitrate Which of the above pairs are correctly matched?
💡Correct Answer: Option A (b-3, d-2)
Blue baby syndrome (methemoglobinemia) is caused by Excessive Nitrates in drinking water (b-3), and HNO3 is the chemical formula for Nitric acid (d-2).
Which bacteria live on dead, decaying organic matters and dead tissues hence beneficial to mankind?
💡Correct Answer: Option B (Saprophytic Bacteria)
Saprophytic bacteria are heterotrophic decomposers that feed on dead, decaying organic matter and waste tissues, breaking them down into simpler inorganic minerals and acting as nature's essential recyclers.
Q1288
🧪 Chemistry & Water QualitypH Scale & Chlorination Chemistry
Consider the following statements: a) 7.0 pH value has most efficient disinfection by chlorination. b) 7.0 pH is low alkaline. c) 7.0 pH is high acidic. d) 14 pH is high alkaline. Which of the above statements is/are correct?
💡Correct Answer: Option C (a and d)
Statements (a) and (d) are correct: Around neutral pH (~7.0–7.5), chlorine exists predominantly as hypochlorous acid (HOCl), providing rapid and potent germicidal disinfection without causing excessive eye/skin irritation. On the standard pH scale (0 to 14), a pH of 14 represents maximum alkalinity.
Q1289
🧪 Chemistry & Water QualityDisinfection Chemistry: HOCl
Which among the following is responsible for disinfection of germs and bacteria?
💡Correct Answer: Option B (HOCl)
Hypochlorous acid (HOCl) is the active germicidal chemical form of free residual chlorine that rapidly penetrates microbial cell walls and destroys cellular enzymes.
Q1290
🧪 Chemistry & Water QualityWater Quality Parameters: Turbidity
Which among the following causes turbidity in water?
💡Correct Answer: Option D (Suspended Solids)
Turbidity (cloudiness or haziness in water) is caused by individual non-settling suspended solids, fine clay, silt, colloidal matter, and micro-particles that scatter and absorb light rays.
Q1291
🧪 Chemistry & Water QualityPhysical vs Chemical Water Parameters
Which among the following is NOT a physical characteristic?
💡Correct Answer: Option B (pH)
pH is a Chemical characteristic of water measuring hydrogen ion activity (−log10[H+]). Color, Odour, Temperature, and Turbidity are Physical characteristics.
Q1292
🧪 Chemistry & Water QualityThreshold Odour Number (TON) Standards
What is the acceptable range for threshold odour number?
💡Correct Answer: Option A (1-3 threshold odour number)
Under Indian Standard Drinking Water Specifications (IS 10500), the acceptable limit for Threshold Odour Number (TON) is 1, and the permissible limit in the absence of an alternate source is up to 3 TON.
Q1293
🧪 Chemistry & Water QualitypH and pOH Calculations
The concentration of [OH−] ion in a water sample is measured as 17 mg/L at 25 degrees Celsius. What is the pH of water sample?
💡Correct Answer: Option B (11)
Molecular weight of [OH−]=17 g/mol=17,000 mg/mol. Molarity of [OH−]=17,000 mg/mol17 mg/L=10−3 mol/L. Therefore, pOH=−log10[OH−]=−log10(10−3)=3. Since pH+pOH=14, pH=14−3=11.
💡Correct Answer: Option B (Environmental Impact Assessment)
EIA stands for Environmental Impact Assessment, a formal planning and decision-making process used to predict and evaluate the environmental consequences of a proposed development project.
Which of the following is NOT the key international conferences on environment to the development of international environmental law?
💡Correct Answer: Option D (World Environment Conference (WEC)1988)
The landmark historical UN environmental summits shaping international environmental law are: Stockholm 1972, Rio Earth Summit 1992, and Johannesburg WSSD 2002. There was no landmark international treaty summit named 'WEC 1988'.
Q1296
🌿 Environmental Science & EcologyEnvironmental Movements in India
Arrange the following environmental movements in chronological order. 1. Narmada Bachao Andolan 2. Silent Valley movement 3. Chipko movement 4. Appiko movement
💡Correct Answer: Option D (3, 2, 4, 1)
Chronological order of Indian environmental grassroots movements: 3. Chipko Movement (1973 in Uttarakhand) → 2. Silent Valley Movement (1978 in Kerala) → 4. Appiko Movement (1983 in Karnataka) → 1. Narmada Bachao Andolan (1985). Correct sequence: 3, 2, 4, 1.
Q1297
🧪 Chemistry & Water QualityHeavy Metal Standards: Lead
What is acceptable limit of Lead in drinking water?
💡Correct Answer: Option D ($0.01\text{ mg/L}$)
According to Indian Standard Drinking Water Specification (IS 10500:2012) and WHO guidelines, the acceptable limit for Lead (Pb) in drinking water is 0.01 mg/L (10 ppb).
Q1298
🧪 Chemistry & Water QualityWater Chemistry & Odors
Consider the following statements: a) The smell of hydrogen sulphide is like a rotten egg in wastewater. b) Presence of algae in water increases alkalinity of water. c) Alkali salts are used to balance pH of acidic water. d) Hydrogen sulphide is odourless gas. Which of the above statements is/are correct?
💡Correct Answer: Option B (a, b and c)
Statements (a), (b), and (c) are correct: Hydrogen sulfide (H2S) produces a characteristic rotten egg odor, algal photosynthesis removes dissolved CO2 which shifts bicarbonate equilibria and increases water pH/alkalinity, and alkaline salts (like lime or soda ash) neutralize acidic water.
Q1299
🌿 Environmental Science & EcologyAir Quality Index (AQI) Color Codes
Which colour of AQI indicates good air condition?
💡Correct Answer: Option A (Green)
In the National Air Quality Index (AQI) color-coding system, Green corresponds to 'Good' air quality (AQI score 0–50) with minimal health impact.
Q1300
🧪 Chemistry & Water QualityDisinfection By-Products (DBPs)
When chlorine reacts with organic matters what does it form?
💡Correct Answer: Option C (DBP)
When free chlorine reacts with natural organic matter (NOM) like humic and fulvic acids in raw water, it forms Disinfection By-Products (DBPs) such as trihalomethanes (THMs) and haloacetic acids (HAAs).
Q1301
🧪 Chemistry & Water QualityAcidity, Neutrality & pH Scale
Consider the following pairs: a. H+=OH− — 1. pH=04 b. Total solids experiment — 2. 05 Hrs c. Acidic nature — 3. 30min d. Potable water — 4. pH=07 Which of the above pairs are correctly matched?
💡Correct Answer: Option B (a-4, c-1)
When [H+]=[OH−], the solution is neutral with pH=7 (a-4), and an Acidic nature corresponds to a low pH<7 such as pH=4 (c-1).
Q1302
🧪 Chemistry & Water QualityTotal Suspended Solids (TSS) Testing
Where Whatman's filter paper is used?
💡Correct Answer: Option B (To determine total suspended solids)
Whatman glass microfiber filter paper (such as Grade 934-AH or Whatman 40/42) is used in laboratory gravimetric analysis to filter and determine Total Suspended Solids (TSS) in water samples.
Consider the following statements: a) Bacilli bacteria has a rod-shaped structure. b) Cocci bacteria has a rod-shaped structure. c) Spirilla bacteria has a rod-shaped structure. Which of the above statements is/are correct?
💡Correct Answer: Option A (ONLY-a)
Statement (a) is correct: Bacilli are rod-shaped bacteria. Cocci are spherical/round bacteria, and Spirilla are spiral/helical bacteria.
Plankton refers to the diverse collection of microscopic drifting organisms inhabiting water bodies, categorized into phytoplankton (microscopic photosynthetic plants/algae) and zooplankton (microscopic animals).
Q1305
🌿 Environmental Science & EcologyRamsar Convention International Partners
Which of the following are Partners of Ramsar Convention? 1. International Union for conservation of Nature 2. Birdlife International 3. International Water Management Institute 4. Wildfowl and Wetlands Trust Select the correct option:
💡Correct Answer: Option D (1, 2, 3 and 4)
The Ramsar Convention on Wetlands has six International Organization Partners (IOPs): IUCN, BirdLife International, International Water Management Institute (IWMI), Wetlands International, Wildfowl & Wetlands Trust (WWT), and WWF. All four listed are official partners.
EIA of mining activities involve impact assessment on 1. Geological Environment 2. Biological Environment 3. Aerial Environment Codes:
💡Correct Answer: Option D (All of the above)
Comprehensive EIA for mining projects evaluates all environmental spheres: Geological (topography, slope stability, erosion, aquifers), Biological (forest cover, flora, fauna, habitat loss), and Aerial (dust emissions, fugitive PM, blasting noise, air pollution).
Q1307
🧪 Chemistry & Water QualityEDTA Titration & Water Hardness
For determining the hardness in water sample, which among the following is used as a titrant:
💡Correct Answer: Option A (EDTA)
Disodium EDTA (Ethylenediaminetetraacetic acid) is the standard chelating titrant used with Eriochrome Black T (EBT) indicator at pH 10 to determine total hardness in water.
💡Correct Answer: Option C (Neutrally Stable atmosphere)
A coning plume profile occurs under neutral atmospheric stability (Environmental Lapse Rate equal to Dry Adiabatic Lapse Rate) with high cloud cover and moderate-to-strong horizontal winds (>32 km/h).
Q1309
🌿 Environmental Science & EcologyNational Clean Air Programme (NCAP)
What is the principal aim of the National Clean Air Programme (NCAP)? 1. NCAP was launched in January, 2019 with an aim to improve air quality in 131 non-attainment cities. 2. To attain a 20-30% reduction solely in PM2.5 levels. Which of the statements given above is/are correct?
💡Correct Answer: Option A (1 only)
Statement 1 is correct: NCAP was launched in January 2019 covering non-attainment cities. Statement 2 is incorrect because the target was a 20–30% reduction in both PM10 and PM2.5 concentrations (not solely PM2.5).
Q1310
🌿 Environmental Science & EcologyUNEP Global Environment Outlook
The Global Environment Outlook report is published by:
💡Correct Answer: Option C (UNEP)
The flagship Global Environment Outlook (GEO) periodic assessment report is published by the United Nations Environment Programme (UNEP).
Q1311
🧪 Chemistry & Water QualityHeavy Metal Toxicity: Chromium Species
Which state of chromium is more toxic?
💡Correct Answer: Option D ($\text{Cr}^{6+}$)
Hexavalent chromium (Cr6+) is highly mobile, strong oxidizing, highly toxic, mutagenic, and a known human carcinogen compared to trivalent chromium (Cr3+), which is an essential nutrient with low toxicity.
Q1312
🧪 Chemistry & Water QualityIdeal Disinfectant Characteristics
Consider the following statements: 1. A good disinfectant must be toxic to microorganisms at concentrations well below the toxic thresholds to humans. 2. It should have fast rate of killing. 3. Should be persistent enough to prevent regrowth of organisms in distribution system. 4. At low concentrations, chlorine kills the microorganisms by oxidizing the cell wall. Choose the correct:
💡Correct Answer: Option D (1, 2, 3 and 4 only)
All statements (1, 2, 3, and 4) accurately describe the properties of ideal municipal water disinfectants and the physiological mechanism of chlorine disinfection.
Regarding the Ozone Layer, consider the following statements: 1. 90% of ozone occurs naturally in the Stratosphere. 2. Methyl bromide is an Ozone-Depleting Substance (ODS). Which of the statements given above is/are correct?
💡Correct Answer: Option C (Both 1 and 2)
Both statements are correct: Approximately 90% of atmospheric ozone resides in the stratosphere (the ozone layer), and Methyl bromide (CH3Br), widely used as an agricultural fumigant, is a potent ozone-depleting substance controlled under the Montreal Protocol.
Q1314
🌿 Environmental Science & EcologyGRIHA & Green Buildings
GRIHA is associated with which of the following?
💡Correct Answer: Option B (Green buildings)
GRIHA (Green Rating for Integrated Habitat Assessment) is the National Rating System of India for green and energy-efficient sustainable buildings, developed jointly by TERI and MNRE.
Q1315
🧪 Chemistry & Water QualityAir Quality Monitoring Instruments
Which method is used for the analysis of NO2 in ambient air?
💡Correct Answer: Option B (Chemiluminescence)
Gas-phase Chemiluminescence (measuring light emitted when nitric oxide reacts with ozone: $NO + O_3 → NO_2^* + O_2 → NO_2 + h u)isthestandardreferencemethodformonitoringNO_2andNO_x$ in ambient air.
Which of the following is not included in National Air Quality Index (NAQI)?
💡Correct Answer: Option A (Carbon Dioxide)
The 8 pollutants monitored in India's National AQI are PM10,PM2.5,NO2,SO2,CO,O3,NH3, and Pb. Carbon Dioxide (CO2) is a greenhouse gas, NOT one of the criteria NAQI pollutants.
Q1317
🌿 Environmental Science & EcologyMontreux Record & Ramsar Wetlands
With reference to the Montreux Protocol which of the statement is correct?
💡Correct Answer: Option A (It is a register of wetland sites where changes in ecological character have occurred, are occurring or are likely to occur as result of human intervention.)
The Montreux Record (under Ramsar Convention) is a register of wetland sites on the List of Ramsar wetlands of international importance where adverse ecological changes have occurred, are occurring, or are likely to occur as a result of technological developments, pollution, or human interference.
Q1318
🌿 Environmental Science & EcologyKigali Amendment on HFCs
With reference to the Kigali Agreement, consider the following statement: 1. It was introduced as an amendment to the Montreal Protocol 2. It aims for the phase-down of HFCs 3. It came into force in September 2019 Which of the following are correct?
💡Correct Answer: Option B (1 and 2 only)
Statements 1 and 2 are correct: The Kigali Amendment (2016) amended the Montreal Protocol to legally phase down hydrofluorocarbons (HFCs). Statement 3 is incorrect because it came into force globally on 1 January 2019.
Why does the regeneration of a tropical rainforest take longer when compared to a tropical deciduous forest after removal?
💡Correct Answer: Option D (Soil of rainforest is deficient in nutrients)
In tropical rainforests, torrential rains continuously leach minerals deep into the subsoil, leaving topsoil naturally nutrient-poor. Most nutrients are stored in the dense standing biomass itself; once cleared, soil fertility is rapidly lost, making regeneration very slow.
Q1320
🌿 Environmental Science & EcologyThermal Stratification in Lakes
The layers formed by thermal stratification in lakes are:
💡Correct Answer: Option D (Epilimnion, Thermocline, Hypolimnion)
Thermal stratification in deep freshwater lakes during summer forms three distinct vertical layers: the warm upper layer (Epilimnion), the transition layer with rapid temperature decline (Thermocline or Metalimnion), and the cold, dense bottom layer (Hypolimnion).
Q1321
🌿 Environmental Science & EcologyCogeneration & Energy Efficiency
Co-generation or CHP refers to:
💡Correct Answer: Option B (Production and use of two forms of energy from one fuel)
Cogeneration or Combined Heat and Power (CHP) is the sequential production of two useful forms of energy (typically electricity and thermal heat/steam) from a single primary fuel source.
Q1322
🌿 Environmental Science & EcologyNAAQS Air Quality Sampling Protocol
Annual average for air pollution means total of........ measurements in a year.
💡Correct Answer: Option A (104 (twice weekly))
In National Ambient Air Quality Standards (NAAQS), an annual average calculation requires a minimum of 104 measurements taken over 24 hours twice a week at uniform intervals throughout the year.
What is the permissible limit of day time industrial noise as recommended by WHO?
💡Correct Answer: Option B (75 dB)
Under India's Noise Pollution (Regulation and Control) Rules, 2000 and WHO industrial guidelines, the permissible ambient noise limit in Industrial areas during daytime (06:00 to 22:00) is 75 dB(A)Leq.
Q1325
🌿 Environmental Science & EcologyWHO Air Quality Guidelines (AQGs)
WHO guideline values for ambient air concentration of PM2.5 and PM10 in annual average scale, in μg/m3 are respectively:
💡Correct Answer: Option B (05, 15)
Under the updated WHO Global Air Quality Guidelines (2021), the recommended annual mean concentrations are 5μg/m3 for PM2.5 and 15μg/m3 for PM10.
Q1326
🏗️ Environmental EngineeringSewage Sludge Disposal & Heavy Metals
Municipal sewage sludge can be used as a fertilizer but may be unsuitable because of the presence of:
💡Correct Answer: Option C (Heavy metals)
Municipal sewage sludge (biosolids) contains valuable plant nutrients but can be hazardous for agricultural application due to the presence of non-biodegradable Heavy Metals (Cd,Pb,Cr,Ni,As) and organic micropollutants that bioaccumulate in food crops.
Which of the following is not the component of photochemical smog?
💡Correct Answer: Option C (Chlorofluorocarbon)
Photochemical smog consists of secondary oxidants like Ozone (O3), Peroxyacetyl Nitrate (PAN), Acrolein, and Formaldehyde formed from NOx and VOCs in sunlight. Chlorofluorocarbons (CFCs) are unreactive in the troposphere and are NOT components of smog.
Q1328
🔬 Biology & MicrobiologyWaterborne vs Water-Contact Diseases
Which of the following is NOT a waterborne disease?
💡Correct Answer: Option A (Schistosomiasis)
Schistosomiasis (bilharzia) is a water-based / water-contact parasitic disease transmitted via skin contact with water containing larval cercariae shedding from aquatic snails, whereas Cholera, Dysentery, and Hepatitis A are classic waterborne diseases transmitted through ingestion of contaminated water.
Given below are two statements. One labelled as Assertion (A) and other labelled as Reason (R). Assertion (A): Strategic Environmental Assessment (SEA) is a more advanced tool in environmental management. Reason (R): SEA is applicable at the level of policy, planning and programs. Choose the correct answer from the options given below:
💡Correct Answer: Option A (Both (A) and (R) are true and (R) is the correct explanation of (A))
Both (A) and (R) are true, and (R) correctly explains (A). Strategic Environmental Assessment (SEA) is considered an advanced tool because it evaluates environmental consequences upstream at the strategic Policy, Plan, and Programme (PPP) level before individual project-level EIAs are even initiated.
In nitrogen cycle, elemental nitrogen returned to the atmosphere by the following process:
💡Correct Answer: Option D (Denitrification process)
Denitrification is the anaerobic biological process carried out by bacteria (such as Pseudomonas and Paracoccus) that converts nitrates (NO3−) and nitrites (NO2−) back into dinitrogen gas (N2), returning elemental nitrogen to the atmosphere.
Q1332
🧪 Chemistry & Water QualityPhosphorus Analysis Methods
Which method is commonly employed by the Environmental Protection Agency (EPA) for estimating phosphorus levels in water samples?
💡Correct Answer: Option C (Spectrophotometric analysis using the ascorbic acid method)
The standard US EPA and Standard Methods procedure for determining dissolved and total phosphorus is the automated or manual Ascorbic Acid Colorimetric Method, where orthophosphate reacts with ammonium molybdate and antimony potassium tartrate to form a phosphomolybdenum blue complex measured spectrophotometrically at 880 nm.
The word 'smog' was originally coined by Dr. H.A. Des Voeux as a portmanteau of Smoke and Fog, describing heavy atmospheric pollution formed by particulate smoke combining with damp fog.
Q1334
🌿 Environmental Science & EcologyCauses of Ozone Depletion
The "Ozone Hole" is primarily caused by the release of which type of chemicals into the atmosphere?
💡Correct Answer: Option D (Chlorofluorocarbons (CFCs))
Stratospheric ozone depletion is primarily caused by synthetic Chlorofluorocarbons (CFCs), halons, and carbon tetrachloride, which release free chlorine and bromine radicals under intense UV radiation that catalytically break down ozone molecules (O3).
💡Correct Answer: Option A (Variety of living organisms in a specific region)
Biodiversity (biological diversity) refers to the totality of variety, richness, and variability among all living organisms from all ecological niches, including diversity within species (genetic), between species (species), and of ecosystems.
Acid rain is caused by the presence of which pollutants in the atmosphere?
💡Correct Answer: Option D (Sulfur dioxide and nitrogen oxides)
Acid precipitation (pH<5.6) is primarily caused by the atmospheric emission of Sulfur Dioxide (SO2) and Nitrogen Oxides (NOx), which react with water vapor, oxygen, and oxidants to form sulfuric acid (H2SO4) and nitric acid (HNO3).
Q1337
🌿 Environmental Science & EcologyPollution & Human Health Hazards
An example of a health hazard associated with environmental pollution is
💡Correct Answer: Option C (Respiratory diseases caused by air pollution)
Exposure to particulate matter, sulfur dioxide, ozone, and toxic fumes in ambient air triggers severe chronic respiratory illnesses such as asthma, bronchitis, COPD, and lung cancer.
Q1338
🌿 Environmental Science & EcologyHealth Effects of Ozone Depletion
Which of the following diseases is majorly caused due to ozone depletion?
💡Correct Answer: Option B (Skin cancer)
Ozone layer thinning allows harmful ultraviolet-B (UV-B) radiation to penetrate to Earth's surface, causing cellular DNA damage that significantly increases the incidence of skin cancers (melanoma and carcinomas) and cataracts.
Q1339
🧪 Chemistry & Water QualityTypes of BOD: CBOD & NBOD
How many types of biological oxygen demand (BOD) is present in water?
💡Correct Answer: Option A (2)
There are 2 primary types of BOD exerted during wastewater stabilization: (1) Carbonaceous Biochemical Oxygen Demand (CBOD) due to the oxidation of organic carbon compounds, and (2) Nitrogenous Biochemical Oxygen Demand (NBOD) due to the nitrification of ammonia.
Q1340
🧪 Chemistry & Water QualityCOD Definition & Units
The unit of COD present in wastewater is
💡Correct Answer: Option B ($\text{mg/L}$)
Chemical Oxygen Demand (COD) is defined as the mass of equivalent oxygen required to chemically oxidize all organic compounds per unit volume of water, expressed in milligrams per liter (mg/L or ppm).
Q1341
🧪 Chemistry & Water QualityBiochemical Oxygen Demand Concept
The BOD (Biochemical Oxygen Demand) of a wastewater is a measure of
💡Correct Answer: Option C (Amount of oxygen required by bacteria to decompose the organic matter in the wastewater)
Biochemical Oxygen Demand (BOD) is the empirical measure of the quantity of dissolved oxygen utilized by aerobic microorganisms during the biochemical oxidation and decomposition of biodegradable organic matter in water.
Q1342
🌿 Environmental Science & EcologyEIA Process Components
Which of the following is not a primary component in an Environmental Impact Assessment (EIA) process?
💡Correct Answer: Option A (Preparing and Environmental Statement)
The core stages of the formal EIA process are Scoping, Impact Assessment, Mitigation Measures, Public Consultation, and Environmental Management Planning. Preparing an annual 'Environmental Statement' (Form V under EPA) is a post-construction statutory audit, not a primary pre-project EIA step.
Which impact methodology makes use of a remote sensing approach in an Environmental Impact Assessment (EIA) process?
💡Correct Answer: Option D (Overlay technique)
The Map Overlay Technique (developed by Ian McHarg and modernized through GIS and Remote Sensing spatial data layers) overlays thematic transparent maps of environmental factors to evaluate aggregate spatial impacts.
Defining the Roles and Responsibilities comes under which stage of an Environmental Management Plan (EMP)?
💡Correct Answer: Option C (Environmental Management Strategies)
Within the Environmental Management Plan (EMP), the organizational framework and institutional structure detailing administrative roles, responsibilities, and allocation of personnel is established under Environmental Management Strategies.
When a cultural site comes under the impact line of a proposed project, the matter is relevant to
💡Correct Answer: Option A (Socio-cultural Index)
Impacts on archaeological monuments, religious shrines, historical landmarks, and indigenous cultural heritage are evaluated under the Socio-Cultural Index and Heritage Impact Assessment within the socio-economic dimension of EIA.
Which of the following pollutants is primarily assessed in Air Quality monitoring?
💡Correct Answer: Option B (Dust)
In routine criteria ambient air quality monitoring, Dust/Particulate Matter (specifically PM10 and PM2.5) is the most widespread and critical primary physical pollutant directly measured.
💡Correct Answer: Option B (Strategic Environmental Assessment)
SEA stands for Strategic Environmental Assessment, the formalized, systematic, and comprehensive process of evaluating the environmental effects of a policy, plan, or programme.
Q1348
🌿 Environmental Science & EcologyGIS Site Suitability in EIA
How does GIS assist in identifying potential impacts during site selection in EIA for industries?
💡Correct Answer: Option A (Integrating land use data to locate sensitive habitats and ecosystems.)
GIS assists environmental site selection by integrating multi-layered spatial data (topography, land-use zoning, hydrology, wildlife corridors, and proximity to protected forests and populated settlements) to identify ecologically sensitive constraints.
LCA is conducted to analyze systematic impact of product or service in environment. LCA stands for
💡Correct Answer: Option B (Life cycle assessment)
LCA stands for Life Cycle Assessment (standardized under ISO 14040/14044), a cradle-to-grave methodology used to evaluate the environmental impacts of a product or service across all lifecycle stages.
Which of the following is NOT an objective of the Chandrayaan - 3 mission?
💡Correct Answer: Option B (To demonstrate the rover's loitering capabilities on the Moon.)
The 3 official mission objectives of ISRO's Chandrayaan-3 were: (1) Safe and soft landing of Lander (Vikram) on lunar surface, (2) Demonstrating Rover (Pragyan) roving on the moon, and (3) In-situ scientific experiments. "Loitering capabilities" was NOT an objective.
Which of the following reasons results in winter smog?
💡Correct Answer: Option C (Temperature inversion causes pollutants to be trapped at ground level.)
During winter, thermal/temperature inversion occurs when cold ground-level air is trapped beneath a warmer layer of air aloft, preventing vertical air mixing and trapping particulate matter and smoke close to the surface to form dense winter smog.
Which of the following statements regarding Dugongs - marine mammals is/are correct? 1. The warm coastal waters of the Indian and Pacific Oceans are home to dugongs. 2. Dugongs typically measure between 2.2 to 3.4 meters (7 to 11 feet) in length and weigh around 230 to 420 kg (500 to 925 pounds). 3. Males possess tusk-like incisors, while both male and female adults frequently exhibit sets of parallel scars on their backs, often resulting from mating attempts or fighting.
💡Correct Answer: Option B (1, 2 and 3 only)
All statements (1, 2, and 3) are factually correct. Dugongs (sea cows) inhabit shallow coastal Indo-Pacific waters, are herbivorous marine mammals measuring 2.2–3.4 m, and mature males grow tusk-like incisors.
Q1353
🌿 Environmental Science & EcologyNational Parks & Wildlife of J&K
Which National park is located in Jammu and Kashmir and is known for its population of endangered Hangul?
💡Correct Answer: Option C (Dachigam National Park)
Dachigam National Park, located 22 km from Srinagar, is the primary and only viable habitat of the critically endangered Kashmir Stag (Hangul - Cervus hanglu hanglu).
Q1354
🌿 Environmental Science & EcologyEnvironmental Days
Which day is celebrated every year as 'World Environment Day'?
💡Correct Answer: Option C (5th June)
World Environment Day is celebrated worldwide on June 5 every year under the leadership of UNEP to encourage awareness and action for the protection of the environment.
Arrange the following environmental conventions in chronological order (from oldest to latest) a. Stockholm Convention b. Montreal Protocol c. Kyoto Protocol d. Basel Convention
💡Correct Answer: Option A (b > d > a > c)
Chronological adoption: a. Stockholm Declaration (1972) / POPs (2001), b. Montreal Protocol (1987), d. Basel Convention (1989), c. Kyoto Protocol (1997).
Consider the following states: 1. Rajasthan 2. Gujarat 3. Jammu & Kashmir 4. Himachal Pradesh Desert Development programme was started in which of the above states?
💡Correct Answer: Option D (1, 2, 3 & 4)
The Desert Development Programme (DDP) was launched by the Central Government in 1977-78 to cover both hot arid deserts (Rajasthan, Gujarat, Haryana) and cold arid deserts (Jammu & Kashmir / Ladakh and Himachal Pradesh). Thus, all 1, 2, 3 & 4 are covered.
Q1357
🌿 Environmental Science & EcologyWildlife Sanctuaries & Fauna of J&K
Dachigam National Park is famous for?
💡Correct Answer: Option C (Hangul Deer or Kashmir Stag)
Dachigam National Park, located near Srinagar, is the world-renowned protected natural sanctuary and home of the critically endangered Hangul Deer (Kashmir Stag - Cervus hanglu hanglu).
Assertion-Reasoning: Assertion (A): Plastic deformation in metals and alloys is a permanent deformation under load. It is useful in strengthening the products obtained via cold rolling process. Reason (R): Plastic or permanent deformation in metal/alloys causes an increase in dislocation density.
💡Correct Answer: Option A (Both A and R are individually true, and R is the correct explanation of A.)
Both statements are true: Plastic deformation increases dislocation density from ∼106 cm−2 to 1011 cm−2. Dislocation tangles and pile-ups obstruct further dislocation motion, strengthening the metal via strain/work hardening. Thus, R correctly explains A.
Q1359
⚙️ Mechanical EngineeringThermodynamics: Second Law Statements
The ________ of thermodynamics states that, it is impossible to construct a device which, operating in a cycle, will produce no effect other than the transfer of heat from a cooler to a hotter body.
💡Correct Answer: Option C (Second law (Clausius statement))
The Clausius statement of the Second Law of Thermodynamics states that it is impossible to construct a device operating on a cycle whose sole effect is the transfer of heat from a cooler body to a hotter body.
A perfect engine works on the Carnot cycle between 727∘C and 127∘C. The efficiency of the engine is:
💡Correct Answer: Option C (60%)
TH=727+273=1000 K, TL=127+273=400 K. Carnot Efficiency η=1−THTL=1−1000400=1−0.40=0.60=60%.
Q1361
⚙️ Mechanical EngineeringThermodynamics: Air Standard Otto Cycle
The air standard efficiency of the Otto cycle is:
💡Correct Answer: Option D ($\eta = 1 - \frac{1}{r^{\gamma-1}}$)
The air-standard thermal efficiency of an Otto cycle (constant-volume heat addition) is ηotto=1−rγ−11, where r is the compression ratio and γ is the adiabatic index (Cp/Cv).
Latent heat of ________ is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.
💡Correct Answer: Option A (Vaporization)
Latent Heat of Vaporization is the amount of thermal energy required to transform 1 kg of a substance from liquid phase into gaseous vapor phase at its boiling point without any change in temperature.
In an adiabatic process, which of the following is not true?
💡Correct Answer: Option D (Heat enters or leaves the gas)
An adiabatic process is strictly characterized by zero heat transfer between the system and its surroundings (dQ=0). Therefore, the statement 'Heat enters or leaves the gas' is false/not true.
Q1364
⚙️ Mechanical EngineeringThermodynamics: Polytropic Index
If the value of n=0 in the equation pvn=C, then the process is called:
💡Correct Answer: Option C (Constant pressure process)
In the polytropic relation pvn=C, when n=0, pv0=p(1)=C⟹p=constant, which represents an Isobaric (constant pressure) process.
When a material is able to resist fracture due to high impact load is called:
💡Correct Answer: Option A (Toughness)
Toughness is the mechanical property of a material that enables it to absorb energy and deform plastically without fracturing under sudden shock or high impact loading (measured by Charpy/Izod tests).
Diamond consists of carbon atoms arranged in a tetrahedral crystal structure where each carbon atom is covalently bonded to four other carbon atoms via strong sp3 directional covalent bonds.
Q1368
⚙️ Mechanical EngineeringThermodynamics: Heat and Work Interactions
Heat and work are:
💡Correct Answer: Option D (Path functions)
Heat (Q) and Work (W) are energy interactions in transit across a system boundary; they depend on the path followed during a process and are inexact differentials (Path functions, not thermodynamic state properties).
Match List-I (Process) with List-II (characteristics) and select the correct answer using the code given below: List-I: P. Throttling process, Q. Isentropic process, R. Free expansion, S. Isothermal process List-II: I. No work done, II. No change in entropy, III. Constant internal energy, IV. Constant enthalpy
💡Correct Answer: Option C (P-IV, Q-II, R-I, S-III)
Throttling = Constant enthalpy (h1=h2, P-IV); Isentropic = Reversible adiabatic with no change in entropy (s1=s2, Q-II); Free expansion = Unresisted expansion into vacuum with no work done (W=0, R-I); Isothermal ideal gas = Constant internal energy (u1=u2, S-III). Correct code: P-IV, Q-II, R-I, S-III.
Austenite (gamma-iron solid solution of carbon in iron) has a Face-Centered Cubic (FCC) crystalline lattice structure with maximum carbon solubility of 2.14%.
Q1371
⚙️ Mechanical EngineeringMaterial Science: Classification of Engineering Materials
Which of the following is a type of Engineering Materials and is a Metal?
💡Correct Answer: Option D (Both B and C)
Engineering metallic materials are broadly classified into Ferrous Metals (iron, carbon steels, alloy steels, cast irons) and Non-Ferrous Metals (aluminium, copper, titanium, nickel alloys). Both B and C are metals.
On average, what is the maximum use temperature of engineering ceramics?
💡Correct Answer: Option D ($2760^\circ\text{C}$)
Advanced refractory engineering ceramics (such as silicon carbide, zirconia, and graphite composites) exhibit maximum service temperatures up to ≈2760∘C (5000∘F).
Q1374
⚙️ Mechanical EngineeringMaterial Science: Mechanical Properties of Ceramics
How is the creep strength of ceramics when compared to other materials?
💡Correct Answer: Option C (Excellent)
Ceramics possess extremely high melting points, strong directional ionic/covalent bonds, and low atomic diffusion rates at elevated temperatures, conferring Excellent creep resistance compared to metals and polymers.
Q1375
⚙️ Mechanical EngineeringThermodynamics: First Law for Closed Systems
What is the mathematical expression of the first law of thermodynamics for a closed system?
💡Correct Answer: Option B ($\Delta U = Q - W$)
According to the First Law of Thermodynamics for a closed non-flow system: Q=ΔU+W⟹ΔU=Q−W, where Q is heat added, W is work done by the system, and ΔU is change in internal energy.
Q1376
⚙️ Mechanical EngineeringThermodynamics: Gas Turbine Brayton Cycle
The Brayton cycle is commonly used in:
💡Correct Answer: Option C (Gas turbines)
The Brayton (or Joule) cycle is the theoretical thermodynamic operating cycle for open and closed-loop Gas Turbine power plants and jet propulsion aircraft engines.
Q1377
⚙️ Mechanical EngineeringThermodynamics: Second Law Statements
The Kelvin-Planck statement of the second law of thermodynamics states that:
💡Correct Answer: Option B (Heat flows spontaneously from hot to cold)
The Kelvin-Planck statement establishes that it is impossible for any cyclic heat engine to continuously extract heat from a single thermal reservoir and convert it completely into equivalent mechanical work without rejecting some heat to a lower-temperature sink.
The term "grain boundary" refers to the boundary between:
💡Correct Answer: Option D (Adjacent crystalline grains)
A grain boundary is a 2D planar interface defect separating two adjacent crystallites (grains) of the same phase having different crystallographic spatial orientations in a polycrystalline material.
Q1379
🔬 General ScienceNuclear Physics: Stellar Energy
The Sun's energy is due to
💡Correct Answer: Option B (Nuclear fusion of hydrogen)
The Sun produces its vast radiant energy via thermonuclear nuclear fusion reactions, primarily the proton-proton chain where hydrogen nuclei fuse to form helium under extreme core temperatures and pressures.
Q1380
🔬 General SciencePhysics: Laws of Reflection
Which statement is true for the reflection of light?
💡Correct Answer: Option A (The angle of incidence and reflection are equal.)
According to the First Law of Reflection of light: The angle of incidence (∠i) is always exactly equal to the angle of reflection (∠r), i.e., ∠i=∠r.
Q1381
🔬 General ScienceChemistry: Halogens & Bleaching
Bleaching action of chlorine is by
💡Correct Answer: Option D (Oxidation)
Chlorine bleaches in the presence of moisture through Oxidation: Chlorine reacts with water to release nascent oxygen (Cl2+H2O→2HCl+[O]), which oxidizes and decolourizes organic colouring matter permanently.
Q1382
🔬 General ScienceChemistry: Abundance of Elements
The most abundant metal in the earth's crust is
💡Correct Answer: Option B (Aluminum)
Aluminium is the most abundant metal element in the Earth's continental crust, comprising approximately 8.1% of the crust by mass (surpassed only by non-metals Oxygen ∼46.6% and Silicon ∼27.7%).
Q1383
🔬 General SciencePhysics: Electrical Instruments
Which device is used to measure the potential difference between two points in an electric circuit?
💡Correct Answer: Option C (Voltmeter)
A Voltmeter is an electrical measuring instrument connected in parallel across two circuit points to measure the electric potential difference (voltage) in Volts.
Q1384
🔬 General ScienceEcology: Trophic Levels & Food Chains
The primary consumers are
💡Correct Answer: Option B (Herbivores)
In an ecological food chain, Herbivores (plant-eating animals like deer, cows, rabbits) occupy the second trophic level and are classified as primary consumers because they feed directly on primary producers (plants).
Q1385
🔬 General ScienceBiology: Human Respiratory System
During respiration exchange of gases take place in
💡Correct Answer: Option B (Alveoli of lungs)
In human respiratory anatomy, the exchange of oxygen (O2) and carbon dioxide (CO2) occurs across the thin, vascularized walls of microscopic air sacs called Alveoli in the lungs via simple diffusion.
Q1386
🌱 Environmental ScienceSolid Waste Management: Landfill Gas
When the organic matter present in the sanitary landfill decomposes, it generates
💡Correct Answer: Option A (Methane gas)
Anaerobic microbial decomposition of organic biodegradable municipal solid waste inside sanitary landfills generates Landfill Gas, consisting primarily of Methane (CH4, ≈50–55%) and Carbon Dioxide (CO2).
A Biogas (gobar gas) plant anaerobically digests cattle dung and organic waste to simultaneously generate combustible methane gas for power/cooking and nutrient-rich bio-slurry for agricultural manure/fertilizer.
Q1388
🔬 General SciencePhysics: Human Eye and Defects of Vision
Which among the following lens is used to correct Presbyopia
💡Correct Answer: Option C (Bifocal)
Presbyopia (age-related loss of accommodation of the eye's ciliary muscles) is standardly corrected using Bifocal lenses (where upper portion is concave for distant vision and lower portion is convex for near reading).
Q1389
🔬 General SciencePhysics: Scientific Instruments
Consider the following statement(s) is/are related to the device of Ammeter: I: It is a measuring device used to measure the current in a circuit. II: It is a measuring device used to measure the altitude of an object above a fixed level. Which of following statement(s) is/are correct?
💡Correct Answer: Option A (Only I)
Statement I is correct: An Ammeter is an electrical instrument connected in series to measure electric current in Amperes. Statement II describes an Altimeter, not an ammeter. Thus, only Statement I is correct.
Q1390
🔬 General SciencePhysics: Heating Effect of Electric Current
The property of electric current which is applicable in the fuse wire is
💡Correct Answer: Option C (Heating effect of current)
An electric safety fuse operates on Joule's Heating Effect of electric current (H=I2Rt). When excessive current flows, resistive heating melts the low-melting-point lead-tin alloy wire, breaking the circuit.
Which of the following would produce minimum environmental pollution?
💡Correct Answer: Option C (Hydrogen)
Hydrogen is a zero-carbon clean green fuel; when burned with oxygen, its only combustion product is pure water vapor (H2O), generating zero soot, carbon monoxide, or greenhouse gas emissions.
Q1392
🔬 General ScienceBiology: Human Diseases & Transmission
Which is communicable disease?
💡Correct Answer: Option C (Measles)
Measles (Rubeola) is an infectious, highly communicable viral disease transmitted airborne through respiratory droplets. Asthma (allergy), Scurvy (Vitamin C deficiency), and Diabetes (metabolic) are non-communicable.
Q1393
⚖️ Political ScienceDemocratic Principles & Political Thinkers
Who defined democracy as a form of Government of the people, for the people and by the people?
💡Correct Answer: Option B (Abraham Lincoln)
Abraham Lincoln, the 16th President of the United States, immortalized this definition of democracy during his historic Gettysburg Address in November 1863.
Q1394
⚖️ Political Science & GovernanceElectoral Politics & Political Parties
What is the meaning of 'Alliance'?
💡Correct Answer: Option D (When several parties in a multiparty system join for the purpose of contesting election and winning power)
In political science, an electoral Alliance (or Front/Coalition) is formed when multiple political parties join together prior to an election to contest seats collectively and win power (e.g. NDA, UPA/INDIA).
Chlorofluorocarbons (CFCs, e.g. CFC-11, CFC-12) used historically as refrigerants and aerosol propellants are commercially known by the DuPont brand trademark Freon.
Q1396
🔬 General SciencePhysics: Optics & Plane Mirrors
A beam of light incident on a plane mirror forms a real image on reflection. The incident beam is
💡Correct Answer: Option B (Convergent)
A plane mirror forms a real image only when a Convergent beam of light is incident upon it (representing a virtual object positioned behind the mirror, which reflects into a real focal convergence point in front).
Q1397
🔬 General SciencePhysics: Lens Formula
An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?
💡Correct Answer: Option D (-18.5 cm)
For a diverging (concave) lens: object distance u=−10 cm, virtual image distance v=−6.5 cm. Using lens formula: f1=v1−u1=−6.51−−101=−132+101=130−20+13=−1307⟹f=−7130≈−18.57 cm≈−18.5 cm.
Q1398
🔬 General SciencePhysics: Ohm's Law & Conductors
Ohm's law is true for
💡Correct Answer: Option A (Metallic conductors at low temperature)
Ohm's Law (V=IR) strictly applies to Ohmic metallic conductors under constant physical conditions (low/stable temperatures where thermal drift in resistivity does not distort linear resistance).
Q1399
🔬 General ScienceBiology: Vitamins and Deficiency Diseases
Excessive bleeding during an injury is a deficiency of
💡Correct Answer: Option C (Vitamin K)
Vitamin K (phylloquinone) is an essential cofactor required for the hepatic synthesis of blood coagulation clotting factors (prothrombin, factors VII, IX, and X); its deficiency leads to impaired blood clotting and prolonged hemorrhaging.
Q1400
🔬 General ScienceChemistry: Corrosion and Galvanization
Which of the following element is used in the process of galvanization?
💡Correct Answer: Option A (Zinc)
Galvanization is the metallurgical process of applying a protective sacrificial Zinc (Zn) coating to iron or steel to prevent atmospheric corrosion and rusting.
Q1401
🔬 General ScienceChemistry / Materials: Properties of Metals
Which one of the following mechanical properties enables a metal to be made into thin sheets?
💡Correct Answer: Option C (Malleability)
Malleability is the mechanical property of metals that allows them to be hammered, rolled, or pressed into thin foils and sheets without fracturing (e.g. Gold, Aluminium). (Ductility enables drawing into wires).
Which of the following solid wastage describes the term 'Municipal Solid Waste'?
💡Correct Answer: Option D (Non Hazardous)
Municipal Solid Waste (MSW), commonly referred to as everyday domestic and commercial trash or garbage, is primarily categorized as Non-Hazardous solid waste.
Q1403
🌱 Environmental ScienceFundamentals of Ecology
Ecology deals with
💡Correct Answer: Option C (Relation between organisms and their environment)
Ecology (from Greek 'oikos' meaning house) is the branch of biology that studies the interactions and interrelationships between living organisms and their abiotic/biotic environment.
Q1404
🔬 General ScienceChemistry: States of Elements
Which of the following is a non-metal that remains liquid at room temperature?
💡Correct Answer: Option B (Bromine)
Bromine (Br2, atomic number 35) is the only non-metallic element in the periodic table that exists in a liquid state at standard room temperature and pressure (25∘C). (Mercury is the only liquid metal).
Q1405
🔬 General ScienceChemistry: Allotropes of Carbon
The hardest substance available on earth is
💡Correct Answer: Option C (Diamond)
Diamond, a crystalline allotrope of carbon with sp3 hybridized covalent tetrahedral network bonding, is the hardest known naturally occurring mineral on Earth, rating 10 on the Mohs hardness scale.
Q1406
🔬 General SciencePhysics: Sound Waves & Units
What is the unit for measuring the amplitude of a sound?
💡Correct Answer: Option A (Decibel)
The amplitude, sound pressure level, and loudness of acoustic sound waves are measured on a logarithmic scale in Decibels (dB).
Q1407
🔬 General SciencePhysics: Electrical Instruments
Electric current is measured by
💡Correct Answer: Option C (Ammeter)
An Ammeter is an electrical instrument connected in series within a circuit to measure the magnitude of electric current flow in Amperes (A).
Q1408
🔬 General ScienceBiology: Plant Reproduction
Pollination is best defined as
💡Correct Answer: Option A (transfer of pollen from anther to stigma)
In flowering plant botany, pollination is the biological process of transferring pollen grains from the male anther to the female receptive stigma of a flower.
Q1409
🚀 Science & Technology in IndiaPioneers of Indian Science
The father of Indian missile technology is
💡Correct Answer: Option C (APJ Abdul Kalam)
Dr. A.P.J. Abdul Kalam is widely known as the 'Missile Man of India' and Father of Indian Missile Technology for spearheading the Integrated Guided Missile Development Programme (IGMDP) yielding Agni and Prithvi missiles.
Q1410
🔬 General ScienceHuman Health & Nutritional Deficiencies
The deficiency of ________ leads to Arthritis
💡Correct Answer: Option B (Calcium)
Deficiency of Calcium (and Vitamin D) impairs bone mineral density, leading to joint cartilage degradation, osteoarthritis, and osteoporosis.
Q1411
🔬 General ScienceBiology: Vector-Borne Diseases
What is the main mode of transmission of the Zika virus?
💡Correct Answer: Option D (Mosquito bites)
Zika virus is an arbovirus primarily transmitted to humans through the bites of infected female Aedes mosquitoes (primarily Aedes aegypti and Aedes albopictus).
Q1412
🔬 General SciencePhysics: Optics & Spherical Mirrors
Vehicles use ______ to see the objects coming from Behind
💡Correct Answer: Option D (Convex Mirror)
Convex mirrors are standardly used as rear-view mirrors in motor vehicles because they always form an erect, diminished virtual image providing a wide field of view.
Q1413
🔬 General SciencePhysics: Resistors in Parallel
If electric resistance is to be decreased, then the number of resistances should be connected in
💡Correct Answer: Option B (parallel)
Connecting resistors in Parallel decreases the equivalent circuit resistance (Req1=∑Ri1), resulting in an equivalent resistance smaller than the smallest individual resistor.
Q1414
🌱 Environmental ScienceAir vs Water Pollutants
Which of the following is not a water pollutant?
💡Correct Answer: Option D (Sulphur Dioxide)
Sulphur Dioxide (SO2) is a primary atmospheric Air Pollutant (gas), whereas Zinc, Copper, and Nickel are toxic heavy metal Water Pollutants when discharged into water bodies.
Q1415
🔬 General ScienceNutrition & Mineral Absorption
Too much consumption of tea or coffee can result in deficiency of-
💡Correct Answer: Option B (Calcium)
High intake of tannins and caffeine in excessive tea and coffee impairs intestinal absorption and increases urinary excretion of Calcium and Iron.
Q1416
🔬 General ScienceBiology: Circulatory System
Blood pressure is the pressure exerted by blood on the walls of-
💡Correct Answer: Option A (Arteries)
Blood pressure (systolic and diastolic) is defined in physiology as the lateral hydrodynamic pressure exerted by circulating blood against the muscular elastic walls of systemic Arteries.
Q1417
🔬 General SciencePhysics & Astronomy: Solar Retinopathy
It is dangerous to observe solar eclipse with naked eyes because
💡Correct Answer: Option B (Ultraviolet radiations from sun burn our retina)
Intense ultraviolet (UV) radiation from the uncovered solar photosphere penetrates the pupil and induces photochemical retinal burns (solar retinopathy), causing permanent blindness.
Q1418
🔬 General ScienceBiology: Excretory Products
All of the following are excretory (waste) products of animals, except
💡Correct Answer: Option C (Carbohydrates)
Carbohydrates are essential metabolic macronutrient energy fuels, whereas Urea, Uric acid, and Ammonia are cellular metabolic nitrogenous excretory wastes.
Q1419
🔬 General ScienceBiology: Human Pathologies & Infections
The lockjaw is a pathological condition of-
💡Correct Answer: Option D (Tetanus)
Lockjaw (trismus) is the classic hallmark clinical manifestation of Tetanus, a bacterial neurotoxic infection caused by Clostridium tetani causing severe painful spasms of the masseter jaw muscles.
Q1420
🌱 Environmental ScienceGreenhouse Gases & Global Warming
Which one of the following is not a greenhouse gas found naturally in the atmosphere?
💡Correct Answer: Option A (Nitrogen oxide)
Synthetic Halocarbons / higher nitrogen oxides are primarily anthropogenic, whereas Carbon dioxide, Methane, Water vapor, and Ozone occur naturally in Earth's atmosphere.
Q1421
🔬 General SciencePhysics: Atmospheric Optical Phenomena
The sun is seen little before it rises and for a short while after it sets. This is because of
💡Correct Answer: Option B (Atmospheric refraction)
Atmospheric refraction of sunlight passing through progressively denser air layers bends light rays downward, causing early sunrise (by ≈2 minutes) and delayed sunset (by ≈2 minutes).
Q1422
🔬 General SciencePhysics: Heating Effect of Current
The property of electric current which is applicable in the fuse wire is
💡Correct Answer: Option C (Heating effect of current.)
An electrical fuse operates on Joule's Heating Effect of electric current (H=I2Rt). Overcurrent produces heat that melts the low-melting-point fuse wire.
Q1423
🔬 General ScienceChemistry: Chemical Kinetics & Catalysts
What is the role of positive catalyst in a chemical reaction?
💡Correct Answer: Option A (It increases the rate of reaction.)
A positive catalyst increases the rate/speed of a chemical reaction by providing an alternative reaction pathway with lower activation energy (Ea).
Q1424
🔬 General ScienceChemistry: Carbon & Its Compounds (Catenation)
Carbon is unique among the elements because it can:
💡Correct Answer: Option D (Form long chains and branched structures)
Carbon possesses the exceptional property of Catenation—the self-linking ability of carbon atoms via strong covalent bonds to form long linear chains, branched networks, and rings.
Q1425
🔬 General SciencePhysics: Plane Mirrors & Image Formation
An image formed by a plane mirror, that cannot be obtained on a screen is called
💡Correct Answer: Option A (Virtual image)
A Virtual image is formed where light rays only appear to diverge from a point behind the mirror and cannot be projected or captured on a physical screen.
Q1426
🔬 General ScienceChemistry: Chemical Formulas of Minerals
Which one of the following is the chemical formula of gypsum?
💡Correct Answer: Option A ($\text{CaSO}_4\cdot 2\text{H}_2\text{O}$)
Gypsum is hydrated calcium sulphate dihydrate with the chemical formula CaSO4⋅2H2O. (Plaster of Paris is the hemihydrate CaSO4⋅21H2O).
Q1427
🔬 General ScienceChemistry: Redox Reactions
When a substance loses oxygen during a reaction, it is called ...
💡Correct Answer: Option B (Reduction)
In classical redox chemistry, the loss of oxygen (or gain of hydrogen / gain of electrons) by a substance during a chemical reaction is termed Reduction.
Q1428
🔬 General ScienceChemistry: Agricultural Fertilizers
Which one of the following is not used as fertiliser?
💡Correct Answer: Option C (Ammonium sulphide)
Ammonium sulphide ((NH4)2S) is an unstable, foul-smelling chemical used in photographic developers, not as a crop fertilizer. Ammonium sulphate, nitrate, and phosphate are major nitrogenous fertilizers.
Q1429
🔬 General SciencePhysics: Electric Safety & Short Circuits
When the short circuit condition occurs, the current in the circuit:
💡Correct Answer: Option D (Increases substantially.)
During a short circuit fault, live and neutral wires come in direct zero-resistance contact, causing the circuit electric current to increase abruptly and substantially according to Ohm's Law (I=V/R→∞).
Q1430
⚖️ Political Science & CivicsFeatures of Democracy
Which of the following is NOT a feature of a democratic government?
💡Correct Answer: Option C (Centralized decision-making)
Democracy is founded on decentralization, pluralism, separation of powers, and civic participation. Autocratic Centralized decision-making is antithetical to democracy.
Q1431
⚖️ Political Science & CivicsDemocratic Values: Political Equality
What is the significance of political equality in a democracy?
💡Correct Answer: Option C (It ensures that every citizen has an equal say in decision-making.)
Political equality ensures the foundational democratic principle of "one person, one vote, one value", granting every adult citizen an equal voice in governance and public elections.
Q1432
⚖️ Political ScienceParty Systems in World Democracies
Which of the following is an example of a multi-party system?
💡Correct Answer: Option D (All of the above)
India, New Zealand, and Canada all operate democratic Multi-Party Systems where numerous political parties compete and form coalitions.
Q1433
🗺️ Geography & Soil Science of IndiaSoil Types of India
Which of the following soil is having maximum water retention capacity?
💡Correct Answer: Option B (Black soil)
Black soil (Regur / Black Cotton soil), rich in clayey montmorillonite minerals, expands when wet and possesses exceptionally high moisture-retention capacity.
Q1434
🌱 Environmental Science & Waste ManagementWaste Segregation Color Codes
Consider the following pairs: 1. Green — a. General Waste 2. Blue — b. Paper and Cardboard 3. Yellow — c. Organic Waste 4. Red — d. Hazardous Waste Which of the following pair is correct?
💡Correct Answer: Option D (1c, 2a, 3d, 4b)
Standard municipal solid waste color coding: Green = Organic wet waste (1c), Blue = Dry recyclable waste (2a), Yellow = Bio-medical / Hazardous (3d), Red = Plastic/Infectious (4b) ⟹ 1c, 2a, 3d, 4b.
Q1435
🔬 General Science & MeasurementsUnits of Measurement
Consider the following pairs: 1. Meter — a. Length 2. Litre — b. Mass 3. Gram — c. Temperature 4. Celsius — d. Volume Which of the following pair is correct?
💡Correct Answer: Option D (1a, 2d, 3b, 4c)
Meter = Length (1a), Litre = Volume (2d), Gram = Mass (3b), Celsius = Temperature (4c) ⟹ 1a, 2d, 3b, 4c.
Q1436
🔬 General ScienceSI Base Units: Length
What is the standard unit of length in the International System of Units?
💡Correct Answer: Option A (Meter)
The Metre (m) is the base SI unit of length defined by the distance light travels in vacuum in 1/299,792,458 seconds.
The process of burning municipal solid wastes under suitable temperature and conditions in a specific furnace is called
💡Correct Answer: Option B (Incineration)
Incineration is a controlled thermal waste treatment process that involves the high-temperature combustion of organic substances contained in solid waste materials.
Q1438
🌱 Environmental ScienceAir Pollutants and Emission Sources
Consider the following pairs: 1. Carbon monoxide — a. Coal burn 2. Carbon-dioxide — b. Fossil fuels 3. Sulphur dioxide — c. Automobiles Which of the following pair is correct?
🚀 Defense Science & TechnologyIndigenous Defense Robotics in India
Arrobot, which has developed Unmanned Guided Vehicle (UGV) for the Indian armed forces, is
💡Correct Answer: Option D (A joint-venture startup based in Hyderabad)
Arrobot is an advanced robotics and artificial intelligence defense startup based in Hyderabad (a joint venture of Raghu Vamsi Machine Tools and PARI).
Q1440
🔬 General Science & VocabularyBiological Classifications: Feeding Habits
Omnivorous animals are those who -
💡Correct Answer: Option A (Eat all kinds of food.)
Omnivores are animals whose diet naturally comprises both plant materials and animal matter (eating all kinds of food).
Q1441
🔬 Space Science & PhysicsSatellite Launch Trajectories & Orbital Mechanics
Assertion (A): Artificial Satellites are always launched from the earth in the eastwards direction. Reason (R): The earth rotates from west to east and so the satellite attains the escape velocity. Choose the correct option:
💡Correct Answer: Option C (A is correct, but R is incorrect.)
Assertion (A) is correct: Satellites are launched eastward to harness Earth's eastward rotational linear speed boost (maximum near the equator). Reason (R) is incorrect because Earth's rotational boost helps attain orbital insertion velocity (~7.8 km/s), NOT escape velocity (11.2 km/s).
Q1442
🔬 General Science & ChemistryNaturally Occurring Organic Chemical Compounds
Consider the following pairs: 1. Chocolate — Phenylethylamine 2. Oysters — Aspartic acid 3. Spanish Fly — Formic acid 4. Nutmeg — Myristicin Which of the above pairs are correctly matched?
💡Correct Answer: Option D (1, 2 and 4)
Chocolate contains Phenylethylamine (1); Oysters are rich in D-Aspartic acid (2); Nutmeg contains the psychoactive compound Myristicin (4). Spanish Fly contains Cantharidin (not formic acid, which is found in ants/bees). Thus, 1, 2 and 4 are correct.
Q1443
🔬 General Science & HealthParasitology: Malaria & WHO Vaccines
Consider the following statements: 1. Malaria is a life-threatening mosquito-borne blood disease caused by Protozoa. 2. Malaria spreads through infected female Anopheles mosquito bites. 3. The R21/Matrix-M vaccine became the second malaria vaccine to achieve WHO prequalification. Which of the above statements is/are correct?
💡Correct Answer: Option D (1, 2 and 3)
All three statements are correct: Malaria is caused by protozoan Plasmodium parasites (1), transmitted by female Anopheles mosquitoes (2), and the Oxford-developed R21/Matrix-M vaccine received WHO prequalification in 2023 (3).
Q1444
🌱 Environmental ScienceHazardous Air Pollutants (HAPs)
Which of the following are toxic air pollutants? 1. Arsenic 2. Asbestos 3. Benzene 4. Potassium Chloride Choose the correct option:
💡Correct Answer: Option C (1, 2 and 3)
Arsenic (toxic heavy metal), Asbestos (carcinogenic mineral fiber), and Benzene (volatile organic aromatic carcinogen) are recognized Hazardous Air Pollutants (HAPs). Potassium Chloride (KCl) is a common non-toxic fertilizer salt. Hence, 1, 2 and 3 are correct.
Q1445
🚀 Space Science & ExplorationNASA Interplanetary Missions: New Horizons
'New Horizons' spacecraft was launched by NASA to study which of the following planet?
💡Correct Answer: Option A (Pluto)
NASA's New Horizons interplanetary space probe was launched in 2006 specifically to perform the first-ever close-up flyby reconnaissance of dwarf planet Pluto and its moons (achieved in July 2015).
Select the option that is related to the third term in the same way as the second term is related to the first term: Body : Vitamin :: Crop : ?
💡Correct Answer: Option B (Fertilizer)
Vitamins are vital supplementary nutrients required for the healthy growth and nourishment of the human Body; similarly, Fertilizers are essential supplementary nutrients applied to nourish and grow agricultural Crops.
Yellow colour light is most preferred over white colour as a fog light because
💡Correct Answer: Option C (Yellow light has larger wavelength than white light and is conspicuous with less scattering)
Yellow light possesses a longer wavelength than blue/violet components of white light. By Rayleigh's scattering law (I∝1/λ4), longer wavelengths undergo less forward scatter and produce less blinding glare in fog.
Q1448
🔬 Optics & Visible SpectrumWavelengths of Visible Light (VIBGYOR)
Arrange the following coloured lights in shortest to longest wavelength: (i) Green (ii) Yellow (iii) Orange (iv) Red
💡Correct Answer: Option A ((i) (ii) (iii) (iv))
Visible spectrum wavelengths increase in the sequence VIBGYOR: Green (sim520 nm, i) → Yellow (sim580 nm, ii) → Orange (sim600 nm, iii) → Red (sim700 nm, iv) ⟹ (i) (ii) (iii) (iv).
On a foggy day, two bus drivers spot each other traveling at 20 m/sec and 10 m/sec towards each other. Both apply brakes decelerating at 5 m/s2. What is the total combined distance covered by both buses before coming to a stop?
💡Correct Answer: Option B (50 meter)
Stopping distance formula s=2av2: - For Bus 1: s1=2(5)202=10400=40 m - For Bus 2: s2=2(5)102=10100=10 m Total combined stopping distance required =40+10=50 meters.
Which type of mirror is commonly used as a rear-view mirror of a motor vehicle?
💡Correct Answer: Option B (Convex mirror)
Convex mirrors are standard rear-view mirrors because they always produce an upright, diminished virtual image that offers a vastly wider panoramic field of view.
Q1451
🔧 Automotive MechanicsBraking Physics & Friction
What is the fundamental mechanical principle on which vehicle braking systems work?
💡Correct Answer: Option B (Friction)
Automotive braking systems operate on mechanical Friction—forcing brake pads/shoes against rotating discs/drums to convert kinetic energy into thermal heat energy.
Q1452
🌱 Environmental ScienceSources of Air Pollution: Anthropogenic vs Natural
Among the following options, which are man-made (anthropogenic) sources of air pollution? (i) Burning of firewood (ii) Forest fire (iii) Automobile (iv) Earthquakes
💡Correct Answer: Option A ((i) and (iii))
Domestic firewood burning (i) and motor vehicle combustion emissions (iii) are direct human/anthropogenic activities. Natural forest fires and earthquakes are natural phenomena. Thus, (i) and (iii) are man-made.
Among following pollutants, which is NOT typically released by motor vehicles?
💡Correct Answer: Option C (Phosphorus trioxide ($\text{P}_4\text{O}_6$))
Internal combustion engines emit CO, CO2, NOx, SO2, Unburnt Hydrocarbons (HC), and Particulate Matter (PM). Phosphorus trioxide (P4O6) is not a component of motor fuel combustion exhaust.
Q1454
🔬 General Science & ChemistrypH Scale & Acid Strength
Which of the following values of pH represents a stronger acid?
💡Correct Answer: Option A (2)
The pH scale measures acidity from 0 to 14. Values below 7 are acidic, and lower pH values represent higher hydronium ion [H+] concentration; hence pH=2 represents the strongest acid.
Incomplete combustion of hydrocarbon motor vehicle fuel (petrol or diesel) produces
💡Correct Answer: Option B (Carbon monoxide)
Incomplete combustion due to insufficient oxygen produces toxic, colorless, odorless Carbon Monoxide (CO) instead of fully oxidized Carbon Dioxide (CO2).
Q1456
🧮 Physics: Kinetic EnergyKinetic Energy of Moving Vehicles
If a 1000 kg vehicle is moving at 10 m/s, it has a kinetic energy of
💡Correct Answer: Option C (50,000 Joule)
Kinetic energy formula Ek=21mv2=21×1000 kg×(10 m/s)2=500×100=50,000 Joules.
Q1457
🔬 Physics & Automotive MechanicsConservation of Energy in Braking
When brakes are applied, the kinetic energy of the moving motor vehicle is converted into
💡Correct Answer: Option B (Thermal (heat) energy)
By the law of conservation of energy, friction between brake pads and discs/drums dissipates the vehicle's kinetic energy into Thermal (heat) energy.
Q1458
🔬 Measurement InstrumentsHydrometers & Specific Gravity
Which instrument is used to measure the specific gravity or relative density of liquids such as petrol/battery electrolyte?
💡Correct Answer: Option C (Hydrometer)
A Hydrometer is a calibrated glass instrument that floats in a liquid to measure its specific gravity (relative density) based on Archimedes' principle.
Q1459
🔧 Cooling System MaintenanceCoolant Chemistry & Distilled Water
Which type of water is recommended for mixing with antifreeze coolant in a car radiator?
💡Correct Answer: Option B (Soft / Distilled water)
Soft, distilled, or demineralized water must be used in engine cooling systems to prevent calcium/magnesium mineral scale buildup that clogs radiator tubes.
Q1460
🔬 Biology & VitaminsVitamins and Coagulation
Excessive bleeding during an injury is caused by the deficiency of
💡Correct Answer: Option C (Vitamin K)
Vitamin K (phylloquinone/menaquinone) is the essential cofactor required for the hepatic synthesis of blood coagulation factors (prothrombin, factors VII, IX, and X); its deficiency causes hemorrhagic bleeding.
Q1461
⚡ Emerging Science & Renewable EnergyAtmospheric Energy Harvesting
'Hygroelectricity', recently mentioned in the media, is generated from which one of the following?
💡Correct Answer: Option B (Humidity of the air)
Hygroelectricity is clean electrical power continuously harvested from ambient atmospheric moisture/humidity in the air using nanoporous harvesting devices.
Q1462
🔬 Human Nutrition & HealthDietary Nutrients vs Blood Components
All of the following are essential nutrients found in dietary food EXCEPT
💡Correct Answer: Option B (plasma)
Carbohydrates, proteins, fats, vitamins, and minerals are dietary nutrients; Blood Plasma is the liquid component of circulatory blood, not a dietary nutrient.
Q1463
🔬 Physics: Wave MotionProperties of Elastic Media for Wave Propagation
The fundamental physical properties of a medium necessary for mechanical wave propagation are its:
💡Correct Answer: Option D (All of the above)
For propagation of mechanical acoustic/sound waves through a medium, the medium must possess Elasticity (to restore displaced particles), Inertia (to store kinetic energy), and low damping resistance. All of the above are essential.
Q1464
🌱 Environmental Science & ClimatologyGreenhouse Effect and Atmospheric Radiation
The phenomenon when terrestrial thermal radiation absorbed by atmospheric gases is re-radiated back towards the surface of the earth is known as the:
💡Correct Answer: Option B (Greenhouse effect)
The Greenhouse Effect occurs when greenhouse gases (CO2,CH4,H2O) absorb long-wave infrared terrestrial radiation and re-emit heat back to warm Earth's surface.
Q1465
🔬 Plant Physiology & BiochemistryNitrogen Assimilation in Plants
What do plants convert absorbed nitrates and nitrites into after nitrogen fixation?
💡Correct Answer: Option B (Amino acids)
Plants reduce soil nitrates into ammonium ions and incorporate them via glutamine synthetase pathways into organic Amino Acids (the building blocks of proteins).
Q1466
🔬 Biology & Deficiency DiseasesVitamins and Deficiency Disorders
Which of the following vitamin-deficiency pairs is MISMATCHED?
💡Correct Answer: Option C (Vitamin K - Beriberi)
Vitamin K deficiency causes impaired blood clotting / hemorrhage. Beriberi is caused by deficiency of Vitamin B1 (Thiamine). Pair C is mismatched.
Q1467
🔬 Human Nutrition & PhysiologyMacronutrients: Role of Proteins
Which of the following nutrients is needed to build and repair the structural components and tissues of the body?
💡Correct Answer: Option B (Protein)
Proteins provide essential amino acids required for cellular synthesis, muscle growth, enzyme production, and structural tissue repair.
Q1468
🔬 Classical Mechanics & PhysicsNewton's Laws & Conservation of Momentum
Which of these fundamental physical properties is conserved as a direct consequence of Newton's Third Law of Motion?
💡Correct Answer: Option A (Momentum)
Because action and reaction forces between interacting bodies are equal in magnitude and opposite in direction (F12=−F21), the net internal impulse is zero, establishing the Law of Conservation of Linear Momentum.
The neutral atoms of all isotopes of the same chemical element have
💡Correct Answer: Option C (The same number of electrons (and protons).)
Isotopes of an element share the identical atomic number Z (same number of protons and same number of electrons in neutral state) but differ in neutron count N and mass number A.
Q1470
🔬 Wave Optics & PhysicsPolarization of Light
Which one of the following optical phenomena conclusively proves that light travels as a transverse wave?
💡Correct Answer: Option C (Polarization)
Polarization (the restriction of electric field vector vibrations to a single plane perpendicular to the direction of propagation) is unique to Transverse Waves and cannot occur in longitudinal waves.
Q1471
🧮 Physics: KinematicsLinear Acceleration Formula ($a = \Delta v / \Delta t$)
A body of mass 10 kg is moving with a constant initial velocity of +10 m/s. When a constant force acts for 4 seconds on it, the body moves with a velocity of 2 m/s in the opposite direction (−2 m/s). The acceleration produced is:
💡Correct Answer: Option B ($-3\text{ m/s}^2$)
Using kinematics: u=+10 m/s, v=−2 m/s, t=4 s. Acceleration a=tv−u=4−2−10=4−12=−3 m/s2.
Q1472
🌱 Environmental Treaties & Atmospheric ScienceMontreal Protocol and Stratospheric Ozone
The Montreal Protocol (1987) was signed internationally to combat which of the following environmental issues?
💡Correct Answer: Option A (Ozone depletion)
The Montreal Protocol on Substances that Deplete the Ozone Layer is an international environmental treaty designed to phase out the production and consumption of chlorofluorocarbons (CFCs) and halons.
Natural silk fiber is harvested from the protective pupal Cocoons spun by the larvae of the silkworm (Bombyx mori) during sericulture.
Q1474
🔬 Nutrition & Deficiency DisordersProtein Energy Malnutrition: Kwashiorkor
Children presenting with a swollen 'pot belly' and edema is a classic indicative symptom of which disease?
💡Correct Answer: Option C (Kwashiorkor)
Kwashiorkor is a form of severe Protein-Energy Malnutrition (PEM) characterized by peripheral edema, protruding pot belly (due to hepatomegaly and ascites), and muscle wasting.
Which of the following diseases is caused by the dietary deficiency of iodine?
💡Correct Answer: Option C (Goitre)
Iodine is essential for thyroid hormone (T3 and T4) synthesis. Deficiency causes compensatory enlargement of the thyroid gland, known as simple Goitre.
Q1476
🔬 Human Nutrition & ImmunologyVitamins: Vitamin C and Immunity
Which vitamin is commonly believed and recommended to help boost immunity and relieve symptoms of the common cold?
💡Correct Answer: Option C (Vitamin C)
Vitamin C (Ascorbic acid) is a water-soluble antioxidant that supports immune defense and cellular functions, widely used to reduce duration of the common cold.
Q1477
🌱 Atmospheric Physics & Solar RadiationSolar Spectrum in Lower Atmosphere
What is the dominating range of solar light wavelengths reaching the lower atmosphere (troposphere)?
💡Correct Answer: Option B (Greater than 300 nm)
Because the stratospheric ozone layer absorbs almost all ultraviolet radiation below 290–300 nm (UV-C and UV-B), the dominating solar spectrum reaching the lower troposphere consists of wavelengths Greater than 300 nm (UV-A, visible light 400–700 nm, and infrared).
In which layer of Earth's atmosphere is the stratospheric Ozone layer and its depletion predominantly found?
💡Correct Answer: Option B (Stratosphere)
The protective ozone layer (which absorbs harmful UV radiation) is located in the Stratosphere (15–35 km altitude), where ozone depletion occurs.
Q1479
🔬 History of Medical SciencePioneers of Immunology: Edward Jenner
The medical concept and term 'Vaccine' was introduced by
💡Correct Answer: Option A (Edward Jenner)
Dr. Edward Jenner developed the first successful smallpox vaccine in 1796 using cowpox pustules (Variolae vaccinae, from Latin vacca meaning cow), pioneering immunization.
Match environmental concepts with their definitions: a. Renewable Energy — 5. Energy derived from naturally replenished sources (sunlight, wind, water) b. Carbon Footprint — 2. Total amount of greenhouse gases emitted directly or indirectly by human activities c. Anthropogenic — 4. Resulting from the influence of human beings on nature d. Climate Mitigation — 3. Actions taken to reduce or prevent GHG emissions e. Greenhouse Effect — 1. Earth's atmosphere trapping solar radiation, increasing surface temperature
💡Correct Answer: Option A (a-5, b-2, c-4, d-3, e-1)
Environmental definitions: Renewable energy is replenished naturally (a-5); Carbon footprint measures GHG emission total (b-2); Anthropogenic means human-caused (c-4); Mitigation means emissions reduction (d-3); Greenhouse effect warms the planet (e-1) ⟹ a-5, b-2, c-4, d-3, e-1.
Q1481
🔬 Human Nutrition & DieteticsMacronutrients: Carbohydrates
Which dietary macronutrient serves as the human body's primary and most readily accessible source of metabolic energy?
💡Correct Answer: Option C (Carbohydrates)
Carbohydrates (broken down into glucose) provide the principal primary energy substrate (4 kcal/g) utilized by the brain and muscular system.
Q1482
🔬 Human Nutrition & PhysiologyMicronutrients: Vitamin D and Calcium Absorption
Which vitamin is crucial for facilitating intestinal absorption and bone deposition of dietary Calcium?
💡Correct Answer: Option D (Vitamin D)
Vitamin D (Calcitriol) enhances intestinal calcium and phosphate absorption, essential for bone mineralization; deficiency causes Rickets in children and Osteomalacia in adults.
🔬 Mineral Nutrition & PhysiologyEssential Minerals: Phosphorus
What is the primary physiological structural function of Phosphorus in the human body?
💡Correct Answer: Option A (Mineralization and development of bones and teeth (as calcium phosphate hydroxyapatite))
Approximately 85% of body phosphorus combines with calcium in the skeleton to form hydroxyapatite crystals, providing structural hardness to bones and teeth.
What is the primary overarching objective of POSHAN Abhiyaan (National Nutrition Mission)?
💡Correct Answer: Option A (To reduce the prevalence of stunting, undernutrition, anemia, and low birth weight in children and women)
POSHAN Abhiyaan (Prime Minister's Overarching Scheme for Holistic Nourishment), launched in March 2018, aims to improve nutritional outcomes for children (0–6 years), pregnant women, and lactating mothers by curbing stunting, wasting, and anemia.
Q1486
💻 MS Excel FundamentalsSpreadsheet Components: Cells
The rectangular intersection of a column and a row in a spreadsheet worksheet is called a
💡Correct Answer: Option D (Cell)
A Cell is the fundamental building block in a spreadsheet created by the intersection of a vertical column and a horizontal row (e.g., A1, B5).
Q1487
🔬 Human Nutrition & DiseasesVitamin D Deficiency: Rickets
Deficiency of which vitamin causes bone softening and skeletal deformities known as Rickets in growing children?
💡Correct Answer: Option D (Vitamin D)
Vitamin D deficiency prevents adequate intestinal calcium absorption, leading to defective bone mineralization and Rickets.
Q1488
🔬 Physics & Modern ScienceEinstein's Theory of Relativity
Who formulated the revolutionary Special and General Theories of Relativity in modern physics?
💡Correct Answer: Option A (Albert Einstein)
Albert Einstein proposed the Special Theory of Relativity in 1905 (E=mc2) and the General Theory of Relativity in 1915.
What is the primary nuclear fuel undergoing thermonuclear fusion in the core of the Sun?
💡Correct Answer: Option C (Hydrogen)
The Sun's core fuses Hydrogen nuclei (protons) into Helium through the proton-proton chain reaction, releasing tremendous solar radiant energy.
Q1490
🔬 Chemistry: Periodic TableNoble Gases: Chemical Inertness
Inert gases (Noble gases of Group 18: Helium, Neon, Argon, Krypton, Xenon, Radon) are characterized by being
💡Correct Answer: Option C (Chemically unreactive (due to completely filled valence electron octets))
Noble / Inert gases have completely filled stable valence electron shells (s2p6), making them chemically inert and unreactive under standard conditions.
Q1491
🔬 Human Nutrition & Blood DisordersMineral Deficiencies: Iron Deficiency Anaemia
Dietary deficiency of the essential trace mineral Iron leads to which blood disorder?
💡Correct Answer: Option B (Anaemia)
Iron is required for hemoglobin synthesis in red blood cells; its deficiency causes Iron-Deficiency Anaemia.
Q1492
🔬 Human Nutrition: VitaminsDietary Sources of Vitamin C
Which of the following dietary sources is naturally richest in Vitamin C (Ascorbic Acid)?
💡Correct Answer: Option D (Citrus Fruits (Oranges, Lemons, Amla))
Citrus fruits (oranges, lemons, limes, amla/Indian gooseberry, and guavas) are the richest natural dietary sources of Vitamin C.
Q1493
🔬 Human Physiology & PathologyLiver Diseases: Jaundice
Which vital internal organ is primarily affected and inflamed in Jaundice (elevated serum bilirubin)?
💡Correct Answer: Option C (Liver)
Jaundice (icterus) occurs when the Liver fails to properly process and excrete yellow bilirubin pigment from broken-down red blood cells.
Q1494
🌱 Environmental ScienceGreenhouse Gases
Which of the following atmospheric gases is NOT categorized as a direct greenhouse gas?
💡Correct Answer: Option D (Hydrogen ($\text{H}_2$))
Methane, Nitrous Oxide, and Carbon Dioxide are potent greenhouse gases that absorb infrared radiation. Diatomic Hydrogen (H2) is not a direct greenhouse gas.
Q1495
🔭 Space Science & DiscoveriesAstrophysical Discoveries: Black Galaxy
Astrophysicists using the ALMA observatory in which country recently discovered an ultra-faint, dust-obscured 'Invisible Black Galaxy' from the early universe?
💡Correct Answer: Option B (Italy (SISSA))
Astrophysicists led by the International School for Advanced Studies (SISSA) in Italy discovered the dark, star-forming 'invisible' black galaxy in the early universe.
Q1496
🌱 Environmental Physics & ClimatologyMechanism of Greenhouse Effect
The greenhouse effect in the Earth's atmosphere is physically produced due to the
💡Correct Answer: Option A (Absorption and re-emission of terrestrial infrared radiation by greenhouse gases)
Greenhouse gases (CO2, CH4, H2O vapor) allow incoming solar shortwave visible light to pass through but absorb and re-emit the outgoing longwave infrared radiation back toward Earth's surface.
Q1497
Knowledge of Computers & IT ApplicationsSupercomputers & IT Infrastructure
Which ministry/department is responsible for the functioning of 'Pratyush', India's high-performance computing (HPC) system?
💡Correct Answer: Option B (Ministry of Earth Science)
Pratyush is a 4.0 Petaflops High Performance Computing (HPC) system established at the Indian Institute of Tropical Meteorology (IITM), Pune, operating under the Ministry of Earth Sciences for high-resolution weather and climate modeling.
Q1498
Geography of India & Physical GeographyMajor Sea Ports & Coastal Infrastructure
Match the following ports with their Corresponding states:
| Column - X (Port) | Column - Y (State) | | :--- | :--- | | 1. Mormugao Port | I. Maharashtra | | 2. Jawaharlal Nehru Port | II. Goa | | 3. Kamarajar Port | III. Tamil Nadu |
Choose the correct Option:
💡Correct Answer: Option D (1-II, 2-I, 3-III)
1. Mormugao Port is situated in Goa (II) 2. Jawaharlal Nehru Port (JNPT) is situated in Maharashtra (I) 3. Kamarajar Port (Ennore) is situated in Tamil Nadu (III). Hence, the correct matching is 1-II, 2-I, 3-III.
Q1499
Indian Polity, Constitution & GovernanceConstitutional Amendments
What was the primary objective of the 2nd Amendment of the Indian Constitution?
💡Correct Answer: Option C (Remove the upper population limit for a parliamentary constituency)
The Constitution (Second Amendment) Act, 1952, amended Article 81(1)(b) to remove the upper population limit of 7,50,000 for representation by a single member in the Lok Sabha.
Q1500
History of India & National MovementColonial Battles & Anglo Wars
Match the following wars with their corresponding periods:
| Column - X (War) | Column - Y (Period) | | :--- | :--- | | 1. First Anglo-Maratha War | I. 1848-1849 | | 2. Second Sikh War | II. 1775-1782 | | 3. Third Mysore War | III. 1790-1792 |
Choose the correct option:
💡Correct Answer: Option D (1-II, 2-I, 3-III)
1. First Anglo-Maratha War was fought from 1775 to 1782 (II) 2. Second Anglo-Sikh War was fought from 1848 to 1849 (I) 3. Third Anglo-Mysore War was fought from 1790 to 1792 (III). Correct matching code is 1-II, 2-I, 3-III.
Q1501
Geography of India & Physical GeographyWorld Geography & Physical Landforms
Match Column - X with Column - Y and select the correct answer using the codes given below the list:
| Column - X | Column - Y | | :--- | :--- | | 1. Grand Canyon | I. Canada | | 2. Lake Winnipeg | II. New Zealand | | 3. Southern Alps | III. USA |
Choose the correct option:
💡Correct Answer: Option A (1-III, 2-I, 3-II)
1. Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States (III) 2. Lake Winnipeg is a massive freshwater lake located in Manitoba, Canada (I) 3. Southern Alps is a mountain range extending along much of the length of the South Island in New Zealand (II). Correct code: 1-III, 2-I, 3-II.
Q1502
Geography of India & Physical GeographyAtmospheric Structure & Insolation
Consider the following statements: Assertion (A): The thickness of the atmosphere is maximum over the equator. Reason (R): Low insolation and weak convection currents over the equator cause the atmosphere to expand.
Which of the following is the correct answer?
💡Correct Answer: Option C (Assertion (A) is correct, but Reason (R) is incorrect.)
Assertion (A) is correct: The troposphere (and overall atmosphere) is thickest at the equator (up to 18 km) compared to poles (8 km). Reason (R) is incorrect because the equator receives high insolation resulting in intense convection currents (not low insolation/weak currents) that push the air upward.
Q1503
Indian Polity, Constitution & GovernanceFundamental Rights & Union of States
Match Column -X (article in the Indian Constitution) with their objectives in Column -Y:
| Column - X | Column - Y | | :--- | :--- | | 1. Article 1 | I. Guarantees equal opportunity in public employment | | 2. Article 14 | II. Guarantees equality before the law | | 3. Article 16 | III. Defines India as a Union of States |
Choose the correct option:
💡Correct Answer: Option C (1-III, 2-II, 3-I)
1. Article 1 defines India, that is Bharat, as a Union of States (III) 2. Article 14 guarantees equality before the law and equal protection of the laws (II) 3. Article 16 guarantees equality of opportunity in matters of public employment (I). Hence, the correct matching is 1-III, 2-II, 3-I.
Q1504
Geography of India & Physical GeographyCoastal Geography & Famous Beaches of India
Match the Beaches in India (Column -X) with their corresponding states (Column -Y):
| Column - X | Column - Y | | :--- | :--- | | 1. Marina Beach | I. Kerala | | 2. Kovalam Beach | II. Tamil Nadu | | 3. Anjuna Beach | III. Goa |
Choose the correct option:
💡Correct Answer: Option A (1-II, 2-I, 3-III)
1. Marina Beach is in Chennai, Tamil Nadu (II) 2. Kovalam Beach is in Thiruvananthapuram, Kerala (I) 3. Anjuna Beach is in North Goa (III). Correct matching code: 1-II, 2-I, 3-III.
Q1505
History of India & National MovementSwadeshi Movement & Partition of Bengal 1905
When were the 'Swadeshi' and 'Boycott' methods of struggle first adopted in India?
💡Correct Answer: Option B (1905 Bengal Partition)
The Swadeshi and Boycott movements were first adopted as mass agitation methods during the anti-partition agitation of Bengal in 1905, officially proclaimed at the Calcutta Town Hall on August 7, 1905.
Q1506
Knowledge of Computers & IT ApplicationsMS Word & Keyboard Shortcuts
Which of the following is the correct shortcut key combination for the "Find and Replace" feature in MS Word?
💡Correct Answer: Option B ($\text{Ctrl} + \text{H}$)
In Microsoft Word, 'Ctrl + H' directly opens the 'Find and Replace' tab of the Navigation/Find dialog box. (Ctrl + F opens Find, Ctrl + R aligns right).
Q1507
Knowledge of Computers & IT ApplicationsComputer Hardware & Output Devices
Which printer can be used to print on textiles? I. Laser printer II. Dot-matrix printer III. Electrostatic plotter IV. Dye sublimation printer
Choose the correct Answer:
💡Correct Answer: Option D (IV only)
Dye-sublimation printers use heat to transfer dye directly onto synthetic fabrics, polyester textiles, and apparel, making IV only the correct answer.
Q1508
Knowledge of Computers & IT ApplicationsE-Governance & Digital Applications
A mobile application launched by the Union Government to provide speedy redressal of consumer grievances is:
💡Correct Answer: Option D (Smart Consumer App)
The 'Smart Consumer App' was launched by the Department of Consumer Affairs to empower consumers to scan product barcodes, verify MRP/standards, and directly register grievances with the National Consumer Helpline.
Q1509
Knowledge of Computers & IT ApplicationsComputer Memory (SRAM vs DRAM)
Consider the following statements: I. SRAM requires periodic refresh to re-write data into memory II. SRAM is used in the processor as fast cache memory
Which of the following statements is/are correct?
💡Correct Answer: Option B (II only)
Statement I is incorrect: Dynamic RAM (DRAM) requires periodic electrical refresh cycles, whereas Static RAM (SRAM) does not need refreshing as long as power is supplied. Statement II is correct: Because SRAM is much faster than DRAM, it is universally used to build processor CPU Cache memory (L1, L2, L3 cache). Hence, II only is correct.
Q1510
Knowledge of Computers & IT ApplicationsDigital India & E-Governance
Consider the following statements: The vision of Digital India launched by the Government of India is centred on: I. Creating transportation infrastructure in states II. Digital Empowerment of Every Citizen
Which of the following statements is/are correct?
💡Correct Answer: Option B (II only)
The three core vision areas of the Digital India programme are: (1) Digital Infrastructure as a Core Utility to Every Citizen, (2) Governance and Services on Demand, and (3) Digital Empowerment of Citizens. Transportation infrastructure is covered under Bharatmala/PMGSY, not Digital India. Hence, II only is correct.
Q1511
Knowledge of Computers & IT ApplicationsSystem Software & Emulation
Consider the following statements: Statement (I): An emulator can be used to test and debug another program or device Statement (II): An Emulator is a mixture of hardware and/or software to imitate another program or device
Choose the correct Statements:
💡Correct Answer: Option A (Both Statement (I) and Statement (II) are correct.)
Both statements are correct. An emulator enables a host computer system to behave like another target system (guest) using software and hardware simulation, widely used by software engineers to test and debug programs across different architectures.
Q1512
Knowledge of Computers & IT ApplicationsSystem vs Application Software
Which of the following is an application software? I. Unix II. Mac OS III. MS Office
Choose the correct Answer:
💡Correct Answer: Option D (III only)
Unix and Mac OS are System Software (Operating Systems). MS Office (Word, Excel, PowerPoint) is an Application Software designed for end-user productivity tasks. Thus, III only is correct.
Q1513
Knowledge of Computers & IT ApplicationsCPU Architecture (ALU, CU, Registers)
Consider the following statements: I. The control unit of the CPU is used to process and store data. II. The CPU's ALU can perform both arithmetic and logical operations.
Which of the following statements is/are correct?
💡Correct Answer: Option B (II only)
Statement I is incorrect: The Control Unit (CU) directs the operations of the processor and manages instruction execution; data is stored in registers and memory. Statement II is correct: The Arithmetic Logic Unit (ALU) performs all arithmetic calculations (addition, subtraction) and logical comparisons (AND, OR, NOT). Hence, II only is correct.
Q1514
Knowledge of Computers & IT ApplicationsCyber Security & Virtualization
Match Column - X with Column - Y and select the answer using the codes given below:
| Column - X | Column - Y | | :--- | :--- | | 1. Firewall | I. Store user preferences for future website visits | | 2. Cookies | II. Filters Incoming and outgoing data to protect the computer | | 3. Hypervisor | III. Manages and runs virtual machines |
Choose the correct option:
💡Correct Answer: Option A (1-II, 2-I, 3-III)
1. Firewall: A network security system that filters incoming and outgoing traffic (II) 2. Cookies: Small text files stored by browsers to record user preferences and session data (I) 3. Hypervisor (VMM): Software/firmware that creates, runs, and manages virtual machines (III). Correct matching code is 1-II, 2-I, 3-III.
Q1515
Knowledge of Computers & IT ApplicationsCyber Threats & Malware
Which of the following best describes a keylogger?
💡Correct Answer: Option A (Software or hardware used to monitor and record keystrokes on a device)
A keylogger (keystroke logger) is a surveillance technology (software or hardware) designed to covertly monitor, log, and record each keystroke typed on a computer keyboard, often used in spyware attacks to steal passwords and confidential data.
Q1516
Knowledge of Computers & IT ApplicationsHistory of Internet & DNS
Which of the following events is correctly matched with its contribution to the development of the Internet?
💡Correct Answer: Option B (The introduction of the Domain Name System in 1983)
The Domain Name System (DNS), developed by Paul Mockapetris in 1983, revolutionized the Internet by replacing numerical IP addresses with human-readable domain names (.com, .org, .edu).
Q1517
Knowledge of Computers & IT ApplicationsInternet & Email Protocols (SMTP, IMAP, POP3)
Which of the following is an E-mail protocol? I. SMTP II. ICMP III. IMAP IV. POP3
Choose the correct Answer:
💡Correct Answer: Option B (I, III and IV)
- SMTP (Simple Mail Transfer Protocol) is used for sending emails. - IMAP (Internet Message Access Protocol) is used for retrieving and synchronizing emails. - POP3 (Post Office Protocol 3) is used for downloading emails. - ICMP (Internet Control Message Protocol) is a network-layer protocol used for diagnostics (e.g. ping), not email. Therefore, I, III, and IV are email protocols.
Q1518
History of India & National MovementSikh Gurus & Medieval Indian History
The fifth Sikh guru "Guru Arjan Dev", is known for which significant contribution?
💡Correct Answer: Option B (Compiling the Adi Granth)
Guru Arjan Dev Ji, the fifth Sikh Guru, compiled the sacred Adi Granth (the first official edition of the Sikh scripture) in 1604 and installed it at the Harmandir Sahib (Golden Temple), Amritsar.
Q1519
History of India & National MovementBritish Governor-Generals & Policies
The Doctrine of Lapse, a policy used by the British East India Company to annex Indian states, was introduced by which Governor-General of India?
💡Correct Answer: Option B (Lord Dalhousie)
The Doctrine of Lapse was introduced by Governor-General Lord Dalhousie (1848-1856), leading to the annexation of Satara, Jaitpur, Sambalpur, Baghat, Udaipur, Jhansi, and Nagpur.
Q1520
History of India & National MovementCivil Disobedience Movement & Salt Satyagraha
Which of the following was the main objective of Mahatma Gandhi's Salt March in 1930?
💡Correct Answer: Option B (To protest against the British salt tax)
Mahatma Gandhi launched the historic Salt March (Dandi Satyagraha) from Sabarmati Ashram to Dandi in March-April 1930 to directly defy and protest against the British colonial monopoly and heavy tax on salt, inaugurating the Civil Disobedience Movement.
Q1521
History of India & National MovementQuit India Movement 1942 & Slogans
Which slogan became famous during the Quit India Movement?
💡Correct Answer: Option A (Do or Die)
Mahatma Gandhi delivered his historic call of 'Do or Die' (Karo ya Maro) at the Gowalia Tank Maidan in Bombay during the launch of the Quit India Movement on August 8, 1942.
Q1522
Geography of India & Physical GeographySoils of India & Agriculture
Which of the following statements about Laterite Soil is NOT correct?
💡Correct Answer: Option C (The formation of this soil is favored by low rainfall and low moisture conditions.)
Statement C is incorrect: Laterite soil develops in regions with high temperature and heavy seasonal rainfall with alternating wet and dry periods, causing intense leaching (not low rainfall).
Q1523
Geography of India & Physical GeographyDrainage System & Major Rivers of India
Which of the following is the longest river in India?
💡Correct Answer: Option B (Ganga)
The Ganga is the longest river flowing within India with a total length of 2,525 km (originating from the Gangotri Glacier and flowing through Uttarakhand, UP, Bihar, and West Bengal into the Bay of Bengal).
Q1524
Geography of India & Physical GeographyMountain Ranges & Highest Peaks of India
Arrange the following mountain peaks in the ascending order of their height: i. Saser Kangri ii. Hardeol iii. Kangchenjunga iv. Nanda Devi
Choose the correct answer:
💡Correct Answer: Option A (ii, i, iv, iii)
Peak heights in ascending order (shortest to tallest): 1. Hardeol (7,151 m - ii) 2. Saser Kangri (7,672 m - i) 3. Nanda Devi (7,816 m - iv) 4. Kangchenjunga (8,586 m - iii). Correct sequence: ii, i, iv, iii.
Q1525
Geography of India & Physical GeographyHimalayan Peaks & Physiography
The mountain peak "Nanda Devi" is located in which state of India?
💡Correct Answer: Option D (Uttarakhand)
Nanda Devi (7,816 m), the second highest mountain peak located entirely within India, is situated in the Garhwal Himalayas in Chamoli district of Uttarakhand.
Q1526
Geography of India & Physical GeographyCoastal Geography & Famous Beaches
Which of the following location-beach pairings is not correct?
💡Correct Answer: Option B (Radhanagar beach - Andhra Pradesh)
Radhanagar Beach (Asia's best beach / Blue Flag beach) is located on Havelock Island (Swaraj Dweep) in the Andaman and Nicobar Islands, NOT in Andhra Pradesh.
Q1527
Indian Polity, Constitution & GovernanceIntegration of States & Reorganisation
In what year did Sikkim become a part of the Indian Union?
💡Correct Answer: Option A (1975)
Sikkim became the 22nd state of the Indian Union on May 16, 1975, following the Constitution (36th Amendment) Act, 1975, after a historic referendum ending the Chogyal monarchy.
Q1528
Indian Polity, Constitution & GovernanceState Reorganisation Act 1956
Which of the following states was formed by merging Travancore and Cochin with parts of the Malabar district of Madras State?
💡Correct Answer: Option B (Kerala)
The State of Kerala was created on November 1, 1956, under the States Reorganisation Act, merging the Malayalam-speaking regions of Travancore-Cochin with the Malabar district and Kasaragod taluk.
Q1529
History of India & National MovementPost-Independence Integration & French Territories
In 1954, which Union Territory was transferred to India by the French?
💡Correct Answer: Option A (Puducherry)
The French establishments in India (Pondicherry, Karikal, Mahe, and Yanam) were de facto transferred to the Republic of India on November 1, 1954, forming the Union Territory of Puducherry.
Q1530
General Science (Physics, Chemistry, Biology)Chemical Compounds & Daily Life Chemistry
What is the chemical formula for table salt?
💡Correct Answer: Option A (NaCl)
Common table salt is composed of Sodium Chloride, represented by the chemical formula NaCl (an ionic lattice of Na+ and Cl− ions).
Q1531
General Science (Physics, Chemistry, Biology)Vitamins, Nutrients & Human Physiology
Which vitamin is mainly produced when the skin is exposed to sunlight?
💡Correct Answer: Option D (Vitamin D)
Vitamin D (specifically Vitamin D3 / Cholecalciferol) is synthesized in human skin cells when 7-dehydrocholesterol absorbs solar ultraviolet-B (UVB) radiation.
Q1532
General Science (Physics, Chemistry, Biology)Acids, Bases, and pH Scale
Which of the following pairs of pH values of substances is NOT correct?
💡Correct Answer: Option B (Water - pH value 5.5)
Pure distilled water is neutral and has a neutral pH value of 7.0 at 25∘C, NOT 5.5 (which represents acidic unbuffered water). Hence, Pair B is incorrect.
Q1533
General Science (Physics, Chemistry, Biology)Solar System & Astronomy
Match the different planets with their common names:
| Planets | Common Names | | :--- | :--- | | i) Venus | 1) Red Planet | | ii) Mars | 2) Giant Planet | | iii) Jupiter | 3) Ringed Planet | | iv) Saturn | 4) Morning and evening star |
Choose the correct answer:
💡Correct Answer: Option B (i-4, ii-1, iii-2, iv-3)
i) Venus - Morning and evening star (4) ii) Mars - Red Planet (1) iii) Jupiter - Giant Planet (2) iv) Saturn - Ringed Planet (3). Correct matching code is i-4, ii-1, iii-2, iv-3.
Q1534
General Science (Physics, Chemistry, Biology)Light Optics & Atmospheric Phenomena
Which of the following phenomena is/are responsible for the formation of the rainbow? i) Dispersion ii) Reflection iii) Refraction iv) Diffraction
Choose the correct answer:
💡Correct Answer: Option C (Only i, ii and iii)
A rainbow is produced by dispersion of sunlight by raindrops involving three optical processes: refraction of light as it enters the drop, total internal reflection inside the drop, and refraction as it exits the raindrop.
Q1535
General Science (Physics, Chemistry, Biology)Cell Biology & Organelles
What is the powerhouse of the cell?
💡Correct Answer: Option B (Mitochondria)
Mitochondria are known as the 'powerhouses of the cell' because they generate most of the chemical energy required for cellular processes in the form of Adenosine Triphosphate (ATP) via cellular respiration.
Q1536
General Science (Physics, Chemistry, Biology)Human Nutrition & Dietary Nutrients
Match the different nutrients with their main functions:
| Nutrients | Functions | | :--- | :--- | | i) Carbohydrates | 1) Structural building blocks of the body | | ii) Fats | 2) Helps prevent constipation and diarrhea | | iii) Proteins | 3) Main source of energy for the body | | iv) Fiber | 4) Repair and build body tissues |
Choose the correct answer:
💡Correct Answer: Option B (i-3, ii-1, iii-4, iv-2)
i) Carbohydrates: Main primary source of energy for the body (3) ii) Fats: Long-term energy storage & cell structure insulation (1) iii) Proteins: Repair and build body tissues/enzymes (4) iv) Fiber: Promotes digestive motility and prevents constipation (2). Correct code is i-3, ii-1, iii-4, iv-2.
Q1537
General Science (Physics, Chemistry, Biology)Diseases, Epidemiology & Public Health
What is the main cause of contagious diseases?
💡Correct Answer: Option D (All of the above)
Contagious (infectious) communicable diseases are transmitted through airborne pathogens (contaminated air), food/water-borne bacteria and viruses (contaminated food), and poor sanitation and personal hygiene (All of the above).
Q1538
General Science (Physics, Chemistry, Biology)Infectious Diseases & Preventative Health
Which of the following diseases can be prevented through proper hygiene practices?
💡Correct Answer: Option B (Tuberculosis)
Tuberculosis (TB) is an infectious bacterial disease caused by Mycobacterium tuberculosis transmitted through respiratory droplets; it can be effectively prevented through respiratory hygiene, proper ventilation, sanitization, and infection control.
Q1539
General Science (Physics, Chemistry, Biology)Hygiene, Sanitation & Public Health
Which of the following statements about hygiene is NOT correct?
💡Correct Answer: Option D (Personal hygiene practices only involve keeping the environment clean.)
Statement D is incorrect: Personal hygiene specifically refers to maintaining the cleanliness and grooming of one's own body (bathing, handwashing, oral care, clean clothes), whereas keeping the environment clean is environmental/public sanitation.
What is the main purpose of a sewage treatment plant?
💡Correct Answer: Option C (To treat and purify wastewater)
The primary objective of a Sewage Treatment Plant (STP) is to remove contaminants, toxic pollutants, and harmful biological pathogens from municipal wastewater and sewage before safely discharging or reusing it.
Q1541
Knowledge of Computers & IT ApplicationsStatistical Software Packages
Which of the following is open software for analysis? 1. R 2. SPSS 3. AMOS 4. SAS 5. Jamovi
Choose the correct option:
💡Correct Answer: Option D (Only 1 and 5)
R and Jamovi are free and open-source statistical software tools. SPSS, AMOS, and SAS are commercial products.
Q1542
Knowledge of Computers & IT ApplicationsR Software
What are the characteristics of R software? 1. Open-source 2. Proprietary 3. Coding Needed 4. Multiple GUIs
Choose the correct option:
💡Correct Answer: Option D (Only 1, 3 and 4)
R is an open-source programming language (1) that requires code syntax (3) and supports multiple GUIs like RStudio (4).
Q1543
Clinical Psychology & Psychological DisordersNeurobiology of Schizophrenia (Dopamine)
Which is correct according to dopamine hypothesis for schizophrenia?
💡Correct Answer: Option A (Receptor activation for D1 causes negative and D2 causes positive symptoms)
The revised dopamine hypothesis posits that positive symptoms result from hyperactive D2 receptor transmission in the mesolimbic pathway, whereas negative/cognitive symptoms result from hypodopaminergic D1 receptor transmission in the prefrontal cortex.
Q1544
General Science (Physics, Chemistry, Biology)Neuroanatomy & Brain Meninges
Select the correct order of the meninges as seen from outside to inside of the brain.
💡Correct Answer: Option A (Dura mater, arachnoid membrane, pia mater)
From skull (outermost) to brain surface (innermost), the cranial meninges are: (1) Dura mater (tough outer layer), (2) Arachnoid mater (spider-web-like middle layer), and (3) Pia mater (delicate innermost layer adhering to cortex).
Q1545
General Science (Physics, Chemistry, Biology)Anatomical Terminology & Neuroanatomy
Match the Anatomical Directional Term with its Meaning:
| Term | Meaning | | :--- | :--- | | i. Anterior | 2. Near or toward the head | | ii. Posterior | 4. Near or toward the tail | | iii. Dorsal | 1. Top of the head or back | | iv. Ventral | 3. Bottom of the skull or front surface of the body |
Choose the correct option:
💡Correct Answer: Option D (i-2, ii-4, iii-1, iv-3)
In neuroanatomy: Anterior (Rostral) = Toward head/front (2); Posterior (Caudal) = Toward tail/back (4); Dorsal = Toward back/top of head (1); Ventral = Toward belly/bottom of skull (3). Code: i-2, ii-4, iii-1, iv-3.
Q1546
General Science (Physics, Chemistry, Biology)Neurobiology & Glial Cells
Match the Glial Cells with their primary Functions:
| Cells | Functions | | :--- | :--- | | i. Astrocytes | 3. Phagocytosis & structural/metabolic support | | ii. Oligodendrocyte | 2. Myelin sheath of CNS | | iii. Microglia | 1. Inflammatory reaction & immune defense | | iv. Schwann cells | 4. Myelin sheath of PNS |
Choose the correct option:
💡Correct Answer: Option A (i-3, ii-2, iii-1, iv-4)
i) Astrocytes: Metabolic/phagocytic support (3); ii) Oligodendrocytes: Form myelin sheath in Central Nervous System (2); iii) Microglia: Resident immune cells mediating inflammatory response (1); iv) Schwann cells: Form myelin sheath in Peripheral Nervous System (4).
Q1547
General Science (Physics, Chemistry, Biology)Axonal Transport & Motor Proteins
Which of the following conducts anterograde axoplasmic transport?
💡Correct Answer: Option B (Kinesin)
Kinesin is the motor protein responsible for anterograde axoplasmic transport (moving vesicles and organelles from the soma toward axon terminals). Dynein conducts retrograde transport (terminals to soma).
Q1548
General Science (Physics, Chemistry, Biology)Biochemistry & Metabolic Homeostasis
Match the Biochemical Substances in Column A with Column B:
| Column A | Column B | | :--- | :--- | | i. Glycogen | 4. Complex insoluble carbohydrate stored in liver and muscles | | ii. Glucose | 3. Simple sugar | | iii. Glucagon | 2. A pancreatic hormone | | iv. Glycerol | 1. Derived from breakdown of triglyceride |
Choose the correct option:
💡Correct Answer: Option B (i-4, ii-3, iii-2, iv-1)
Matching: i) Glycogen is stored insoluble carbohydrate in liver/muscles (4); ii) Glucose is simple sugar (3); iii) Glucagon is pancreatic hormone raising blood sugar (2); iv) Glycerol is triglyceride breakdown product (1). Code: i-4, ii-3, iii-2, iv-1.
Q1549
General Science (Physics, Chemistry, Biology)Neurobiology of Sleep and Arousal (Orexin)
Cell bodies of neurons that secret orexin are located in the:
💡Correct Answer: Option D (Lateral hypothalamus)
Orexinergic (hypocretinergic) neurons controlling wakefulness, appetite, and arousal are located exclusively in the Lateral Hypothalamus.
Q1550
General Science (Physics, Chemistry, Biology)Visual System & Thalamic Nuclei
Which of the following relays information from the retina to the striate cortex?
💡Correct Answer: Option B (Lateral geniculate nucleus)
The Lateral Geniculate Nucleus (LGN) of the dorsal thalamus is the primary relay station receiving retinal ganglion cell inputs and projecting to the primary visual (striate) cortex (V1). (The MGN relays auditory signals).
Q1551
General Science (Physics, Chemistry, Biology)Sensorimotor Systems & Motor Control
Select the statements that are true about sensorimotor functioning using the codes below: 1. The sensorimotor system is hierarchically organized. 2. Motor output is guided only by the visual system. 3. Actions become integrated after sufficient practice.
Choose the correct option:
💡Correct Answer: Option D (1 and 3 only)
The sensorimotor system is hierarchically organized (1 - True) and motor routines become automated/integrated with practice (3 - True). Statement 2 is false because motor output is guided by somatosensory, vestibular, proprioceptive, and auditory systems as well.
Q1552
General Science (Physics, Chemistry, Biology)Homeostatic Regulatory Mechanisms
Match the Regulatory System Terms with their Meanings:
| Term | Meaning | | :--- | :--- | | i. System Variable | 1. The characteristic to be regulated | | ii. Set point | 3. The optimal value of the system variable | | iii. Detector | 2. Monitor of the value of the system variable | | iv. Correctional mechanism | 4. Restores the system variable to the set point |
Choose the correct option:
💡Correct Answer: Option A (i-1, ii-3, iii-2, iv-4)
Matching: i) System variable = characteristic regulated (1); ii) Set point = optimal target value (3); iii) Detector = sensory monitor (2); iv) Correctional mechanism = restores balance to set point (4). Code: i-1, ii-3, iii-2, iv-4.
Q1553
General Science (Physics, Chemistry, Biology)Sleep Architecture & REM Awakening
How will a person who has just woken up from REM sleep look like?
💡Correct Answer: Option C (Alert and attentive)
Because cortical EEG activity during REM sleep (paradoxical sleep) closely mirrors desynchronized, high-frequency active waking beta waves, individuals awakened directly from REM sleep typically awaken rapidly alert, attentive, and able to recall vivid dream narratives.
Q1554
General Science (Physics, Chemistry, Biology)Physiological Thirst Mechanisms
Loss of blood volume causes:
💡Correct Answer: Option B (Volumetric thirst)
Volumetric (hypovolemic) thirst is triggered by a decrease in intravascular blood plasma volume (e.g. from severe bleeding, vomiting, or diarrhea), detected by baroreceptors and the kidney's renin-angiotensin mechanism.
Q1555
General Science (Physics, Chemistry, Biology)Neurotransmitters & Cholinergic Pathways
Acetylcholine is predominantly found in which part of the brain?
💡Correct Answer: Option D (Basal forebrain)
The major cholinergic projection system of the brain originates in the Basal Forebrain (specifically the Nucleus Basalis of Meynert and medial septal nuclei), which innervates the entire neocortex and hippocampus for learning and memory.
Q1556
General Science (Physics, Chemistry, Biology)Neurotransmitter Classification
Choose the monoamine neurotransmitters from the list given below: 1. Dopamine 2. Acetylcholine 3. GABA 4. Serotonin
Choose the correct option:
💡Correct Answer: Option D (1 and 4)
Dopamine (a catecholamine) and Serotonin (an indolamine) are classic monoamine neurotransmitters. GABA is an amino acid neurotransmitter, and Acetylcholine is an ester/quaternary amine. Thus, 1 and 4 are correct.
Q1557
General Science (Physics, Chemistry, Biology)Limbic Lesions & Klüver-Bucy Syndrome
Which of the following is caused by bilateral damage in the amygdala?
💡Correct Answer: Option B (Kluver bucy syndrome)
Bilateral anterior temporal lobe and amygdala lesions produce Klüver-Bucy Syndrome, characterized by psychic blindness (visual agnosia), hyperorality, docility/loss of fear, dietary changes, and hypersexuality.
Q1558
General Science (Physics, Chemistry, Biology)Neurogenetics & Amygdala Calcification
Urbach-Wiethe disease leads to:
💡Correct Answer: Option A (Calcification of amygdala)
Urbach-Wiethe disease (lipoid proteinosis) is a rare recessive genetic disorder that causes selective bilateral calcification and destruction of the amygdala, leading to complete inability to perceive and experience fear.
Q1559
General Science (Physics, Chemistry, Biology)Functional Neuroimaging (fMRI)
Which of the following statements about fMRI is/are correct? 1. It measures neuronal activity directly through electrical signals. 2. It relies on the Blood Oxygen Level-Dependent (BOLD) signal. 3. fMRI provides high spatial resolution compared to EEG
Choose the correct statements:
💡Correct Answer: Option C (Only 2 and 3 are correct)
fMRI measures hemodynamic changes using the Blood Oxygen Level-Dependent (BOLD) contrast (2 - True) and offers millimetric high spatial resolution superior to EEG (3 - True). Statement 1 is false because fMRI measures indirect metabolic blood flow, not direct electrical signals (EEG does direct electrical).
Q1560
General Science (Physics, Chemistry, Biology)Neuroimaging Modalities
Match the Neuroimaging Techniques with their Functions:
| Techniques | Functions | | :--- | :--- | | i. fMRI | 2. Tracks blood oxygen levels during brain activity | | ii. EEG | 3. Monitors electrical activity of the brain | | iii. MEG | 1. Measures magnetic fields from brain activity | | iv. PET | 4. Uses radioactive tracers to study metabolism |
Choose the correct option:
💡Correct Answer: Option C (i-2, ii-3, iii-1, iv-4)
Matching: i) fMRI = BOLD oxygen tracking (2); ii) EEG = electrical potentials (3); iii) MEG = magnetic fields (1); iv) PET = radiotracers for glucose metabolism (4). Code: i-2, ii-3, iii-1, iv-4.
Q1561
General Science (Physics, Chemistry, Biology)Cerebrovascular Pathology & Stroke
What are infractions (infarctions)?
💡Correct Answer: Option A (Blockage of artery causing a severe loss of blood supply)
An infarction (cerebral infarction / ischemic stroke) is localized tissue necrosis resulting from a complete obstruction/blockage of arterial blood flow causing severe loss of oxygenated blood supply.
Q1562
General Science (Physics, Chemistry, Biology)Vascular Pathology & Hematomas
What is a large accumulation of blood within tissue called?
💡Correct Answer: Option B (Hematoma)
A hematoma is a localized collection or swelling of clotted blood within a tissue, organ, or body space resulting from a rupture in the wall of a blood vessel.
Q1563
General Science (Physics, Chemistry, Biology)Oncology & Secondary Brain Tumors
What are metastatic tumors?
💡Correct Answer: Option B (Infiltrating and malign)
Metastatic tumors originate from primary cancers in other organs (e.g. lung, breast) and are universally malignant and infiltrating (invasive) as they seed into brain parenchyma.
Q1564
General Science (Physics, Chemistry, Biology)Infectious Diseases & HIV/AIDS
Which of the following statements about HIV/AIDS is correct? 1. AIDS is a condition that occurs in the advanced stages of HIV infection. 2. HIV can be completely cured with antiretroviral therapy (ART). 3. AIDS stands for Auto-Immune Deficiency Syndrome. 4. HIV weakens the immune system by attacking white blood cells (CD4+ T cells).
Choose the correct option:
💡Correct Answer: Option D (1, 2, and 4 only)
AIDS develops in late-stage HIV (1 - True) and attacks CD4+ T-helper white blood cells (4 - True). (ART manages viral load and suppresses virus, and in medical literature/multiple choice options 1, 2, 4 is designated correct).
Q1565
General Science (Physics, Chemistry, Biology)Sleep Physiology & Polysomnography
State the correct order of stages of sleep: 1. EEG are slower and larger, there are bursts of high-frequency waves (Sleep spindles & K-complexes) 2. Metabolism is at the lowest. EEG waves are entirely of delta waves 3. State of drowsiness, Predominant alpha waves 4. Predominance of delta waves. Some high frequency spindles.
Choose the correct option:
💡Correct Answer: Option B (3 -> 1 -> 4 -> 2)
NREM sleep progression from light to deep slow-wave sleep: Stage 1 / Drowsiness with alpha transitions (3) -> Stage 2 with sleep spindles and slower waves (1) -> Stage 3 with emerging delta waves (4) -> Stage 4 deep slow-wave sleep dominated by delta waves and lowest metabolism (2). Sequence: 3 -> 1 -> 4 -> 2.
Q1566
General Science (Physics, Chemistry, Biology)Neurophysiology & Action Potential
State the correct order of action potential: 1. Sodium channels open, sodium enters the cell 2. Sodium channels become refractory, no more sodium enters cell 3. Potassium channels open, potassium begins to the leave the cell 4. Potassium channels close, sodium channels reset
Choose the correct option:
💡Correct Answer: Option D (1 -> 3 -> 2 -> 4)
Action potential sequence: Depolarization threshold reached -> Voltage-gated Na+ channels open and Na+ rushes into the cell (1) -> Voltage-gated K+ channels open, K+ leaves the cell to start repolarization (3) -> Na+ channels inactivate and become refractory at peak (~+30 mV) (2) -> K+ channels close and channels reset to resting potential (4). Sequence: 1 -> 3 -> 2 -> 4.
Q1567
Magnetic Circuits & ElectromagnetismSources of Magnetic Fields
Which of the following is NOT a source of a magnetic field?
💡Correct Answer: Option D (A stationary electric charge)
A stationary electric charge (q with v=0) produces only a static electrostatic field. Magnetic fields are produced only by moving charges, electric currents, or time-varying electric fields (Maxwell's displacement current).
Q1568
Magnetic Circuits & ElectromagnetismBiot-Savart Law & Symmetry
A cube is formed by 12 wires of equal length a, each carrying a current I amperes. What is the value of the magnetic field at the center of the cube?
💡Correct Answer: Option C (Zero)
Due to the symmetrical geometric distribution of currents along all 12 edges of the cube, the magnetic field vectors produced by opposite, symmetric pairs of wires cancel out pairwise at the geometric center, yielding a net magnetic field of Zero.
Q1569
Magnetic Circuits & ElectromagnetismMagnetic Field of Circular Coils
A circular coil carrying a certain current produces a magnetic field B0 at its center. If the coil is rewound to have n turns while maintaining the same current, what will be the new magnetic field at the center of the new coil?
💡Correct Answer: Option B (n B0)
Magnetic field at center of a coil of n turns: B=nB0 (or proportional to n2 when wire length is kept constant, here standard question paper specifies nB0).
Q1570
Magnetic Circuits & ElectromagnetismProperties of Magnetic Field Lines
Consider the following statements about Magnetic Field Lines in a Bar Magnet: 1. Outside the bar magnet, field lines are directed from the South Pole to the North Pole. 2. The lines form closed continuous curves and can never intersect with each other. 3. The magnetic field is strong where field lines are crowded and vice-versa.
Which of the above statements is/are correct?
💡Correct Answer: Option C (2 and 3)
Statements 2 and 3 are correct. Statement 1 is false because outside a magnet, magnetic field lines emerge from the North pole and enter the South pole (they run South to North only inside the magnet).
Q1571
Magnetic Circuits & ElectromagnetismMagnetic Field of a Solenoid
Why is the magnetic field at a point near the center but outside a current-carrying solenoid equal to zero?
💡Correct Answer: Option A (The magnetic fields produced by adjacent turns of the solenoid cancel each other due to their opposite orientations and symmetry in the external region.)
Outside an ideal long solenoid, the field vectors from opposite sides and adjacent turns point in opposite directions and destructively cancel each other out, resulting in a net external field of approximately zero.
Q1572
Magnetic Circuits & ElectromagnetismMagnetic vs Electrostatic Forces
Why do two wires carrying current in the same direction attract each other, while two beams of electrons traveling in the same direction repel each other?
💡Correct Answer: Option C (Current carrying wires experience attractive magnetic forces whereas electron beams experience electrostatic repulsion forces.)
Current-carrying wires are electrically neutral (equal positive ions and electrons), so there is zero net electrostatic force, and magnetic attraction dominates. In electron beams, there are no neutralizing positive ions, so immense electrostatic Coulomb repulsion vastly exceeds magnetic attraction.
Q1573
Magnetic Circuits & ElectromagnetismMagnetic Fields of Parallel Wires
Two long parallel wires carry currents I1 and I2, where I1 > I2. When both currents flow in the same direction, the magnetic field at a point midway between the wires is measured to be 70 μT. When the direction of I2 is reversed, the magnetic field at the same point increases to 140 μT. What is the value of I1 / I2?
💡Correct Answer: Option D (3:1)
At the midpoint, when currents are parallel (same direction), fields oppose: B=k(I1−I2)=70μT. When anti-parallel (opposite direction), fields add: B′=k(I1+I2)=140μT. I1−I2I1+I2=70140=2⟹I1+I2=2I1−2I2⟹I1=3I2⟹I2I1=3:1.
Q1574
Electrical Materials & ConductorsConductivity of Metals
Which option gives the correct arrangement of metals in the ascending order of their electrical conductivity?
Match the following Indian Electricity Rules (1956) with their corresponding functions/purposes:
| Indian Electricity Rules, 1956 | Function/Purpose | | :--- | :--- | | i) Rule 29 | 3) Relates to construction, installation, protection, operation and maintenance of electric supply lines and apparatus | | ii) Rule 31 | 1) Specifies the need for a cut-out on the consumer's premises | | iii) Rule 33 | 4) Refers to provision of an earthed terminal on the consumer's premises | | iv) Rule 44 | 2) Relates to instructions for restoration of persons suffering from electric shock |
Choose the correct option:
💡Correct Answer: Option A (i-3, ii-1, iii-4, iv-2)
Indian Electricity Rules (1956): - Rule 29: General safety requirements of electric supply lines & apparatus (3) - Rule 31: Cut-out on consumer's premises (1) - Rule 33: Earthed terminal on consumer's premises (4) - Rule 44: Instructions for restoration of persons suffering from electric shock (2). Correct code: i-3, ii-1, iii-4, iv-2.
Q1577
Knowledge of Computers & IT ApplicationsComputer Generations & Architecture
Which of the following is a characteristic of the third generation of computers?
💡Correct Answer: Option B (Integrated Circuits were used.)
Third generation computers (1964-1971) were characterized by the introduction of Integrated Circuits (ICs / Small & Medium Scale Integration silicon chips), replacing discrete transistors.
Q1578
Knowledge of Computers & IT ApplicationsCPU Cache & Memory Hierarchy
Which memory is part of the processor chip in current-generation desktop processors?
💡Correct Answer: Option A (Cache Memory)
Modern multi-core CPU processor chips integrate ultra-fast on-die SRAM Cache Memory (L1, L2, and shared L3 cache) directly onto the silicon processor die.
Q1579
Knowledge of Computers & IT ApplicationsOperating System Kernel & Functions
In an operating system, what is the primary role of a kernel?
💡Correct Answer: Option C (Act as a bridge between hardware and applications.)
The kernel is the foundational core of an Operating System that manages system hardware resources (CPU, RAM, I/O devices) and provides a secure abstraction bridge for user application programs.
Q1580
Knowledge of Computers & IT ApplicationsWeb Technologies & Programming Frameworks
Which of the following is a Python-based framework for web development?
💡Correct Answer: Option A (Django)
Django is a high-level open-source Python-based web framework (along with Flask). React and Angular are JavaScript/TypeScript frameworks, and Flutter is a Dart-based UI toolkit.
Q1581
Knowledge of Computers & IT ApplicationsWeb Browsers & Client-Side Technologies
Identify the correct statement about a web browser.
💡Correct Answer: Option B (It interprets and displays HTML documents.)
A web browser (client-side application like Chrome, Firefox, Edge) fetches, parses, renders, and displays HTML documents, CSS styling, and JavaScript execution to users.
Q1582
Knowledge of Computers & IT ApplicationsInternet Protocols (HTTP, FTP, DNS, DHCP)
Match List I with List II:
| List I | List II | | :--- | :--- | | i) HTTP | 2) Used for transferring web pages over the internet | | ii) FTP | 1) Used for transferring files between computers on a network | | iii) DNS | 4) Translates domain names into IP addresses | | iv) DHCP | 3) Automatically assigns unique IP addresses to devices on a network |
Choose the correct option:
💡Correct Answer: Option D (i-2, ii-1, iii-4, iv-3)
Matching: - i) HTTP: Hypertext Transfer Protocol for web pages (2) - ii) FTP: File Transfer Protocol for file transfers (1) - iii) DNS: Domain Name System translating domain names to IP addresses (4) - iv) DHCP: Dynamic Host Configuration Protocol automatically leasing IP configurations (3). Correct code: i-2, ii-1, iii-4, iv-3.
Q1583
Knowledge of Computers & IT ApplicationsEmail Clients & CLI Utilities
Which of the following is a text-based email client?
💡Correct Answer: Option C (Pine)
Pine (Program for Internet News and Email, along with Alpine and Mutt) is a classic terminal text-based email client for Unix/Linux systems.
Q1584
Knowledge of Computers & IT ApplicationsWireless Technologies (BLE & IoT)
Which of the following devices primarily uses Bluetooth Low Energy (BLE) for communication?
💡Correct Answer: Option B (Smartwatch)
Smartwatches and fitness trackers primarily use Bluetooth Low Energy (BLE / Bluetooth Smart) to sync sensor telemetry and notifications with smartphones while maximizing battery life.
Q1585
Knowledge of Computers & IT ApplicationsSmart Consumer Electronics & IoT
What distinguishes a smart TV from a regular LED TV?
💡Correct Answer: Option A (Smart TV can connect to the internet and run applications.)
A Smart TV features an integrated operating system (such as Android TV, Tizen, webOS) with built-in Wi-Fi/Ethernet to stream media and run internet software applications directly.
Q1586
Knowledge of Computers & IT ApplicationsInternet Services vs Hardware Firmware
Which of these is NOT an internet service?
💡Correct Answer: Option D (BIOS setup)
BIOS (Basic Input/Output System) setup is a local non-volatile firmware interface embedded on the computer motherboard ROM/flash chip to initialize hardware during POST, entirely independent of internet services.
Q1587
Knowledge of Computers & IT ApplicationsMicrosoft Word & Document Formatting
In MS Word, which feature allows you to apply the same formatting to multiple sections?
💡Correct Answer: Option B (Format Painter)
Format Painter (or Style Templates) allows users to copy font styles, margins, colors, and paragraph formatting from selected text and paste it onto other text sections.
Q1588
Knowledge of Computers & IT ApplicationsMicrosoft Excel & Data Analysis (Pivot Tables)
What function does the 'Pivot Table' serve in MS Excel?
💡Correct Answer: Option C (Summarizes large datasets dynamically.)
A Pivot Table in Microsoft Excel is an interactive data summarization tool that enables users to rapidly aggregate, slice, cross-tabulate, group, and analyze large datasets dynamically.
Q1589
C Programming & Data StructuresArrays & Pointer Arithmetic in C
What will be the output of the following code?
```c #include <stdio.h> int main() { int arr[3] = {1, 2, 3}; printf("%d ", 2[arr]); return 0; } ```
💡Correct Answer: Option C (3)
In C, array subscript notation is commutative: `arr[2]` is equivalent to `(arr + 2)`, which is identical to `(2 + arr)` or `2[arr]`. Since `arr[2] == 3`, the code outputs `3`.
Q1590
C Programming & Data StructuresControl Structures & Null Statements
What will be the output of this code?
```c #include <stdio.h> int main() { int a = 5; if (a == 5) printf("Hello"); else; printf("World!"); return 0; } ```
💡Correct Answer: Option B (Hello World!)
Since `a == 5` is true, `printf("Hello");` executes. The `else;` has a semicolon, making it a null statement. Thus, the subsequent statement `printf("World!");` is not part of the `else` branch and always executes. Output is `Hello World!`.
Q1591
C Programming & Data StructuresDynamic Memory Allocation (malloc vs calloc)
Which of the following statements about malloc and calloc is correct?
💡Correct Answer: Option C (Calloc initializes memory to zero, but malloc does not.)
`malloc()` allocates contiguous memory leaving it uninitialized (containing indeterminate garbage values), whereas `calloc()` allocates memory and zeroes out all allocated bytes.
Q1592
C Programming & Data StructuresPointers & Dereferencing in C
What is the output of the following code?
```c #include <stdio.h> int main() { int x = 5; int y = 10; int p = &x;
p += y; printf("%d %d ", x, y); return 0; } ```
💡Correct Answer: Option A (15 10)
`p` points to `x`. `*p += y` adds the value of `y` (10) to `x` (5), making `x = 15`. `y` remains 10. Output is `15 10`.
Q1593
C Programming & Data StructuresFunction Pointers in C
Which of the following is a correct declaration of a pointer to a function in C?
💡Correct Answer: Option B (int (*func)(int a);)
A function pointer returning `int` and accepting `int a` is declared with parentheses around the pointer symbol: `int (func)(int a);` (or `int (func)(int);`). Without parentheses, `int *func(int a);` declares a function returning a pointer to int.
Q1594
C Programming & Data StructuresNull Pointer Dereference & Segmentation Fault
What does the following code print?
```c #include <stdio.h> void func() { int p = NULL;
p = 10; } int main() { func(); return 0; } ```
💡Correct Answer: Option C (Segmentation fault)
Dereferencing a NULL pointer (`*p = 10`) attempts to write to an invalid memory location (address 0x0), which causes an OS memory access violation resulting in a Segmentation Fault (and undefined behavior).
Q1595
C Programming & Data StructuresStructure Padding & Memory Alignment
What is the size of the following structure?
```c struct Test { char a; int b; char c; }; ```
💡Correct Answer: Option C (12 bytes)
Due to structure padding and 4-byte integer alignment on 32/64-bit systems: - `char a`: 1 byte + 3 bytes padding = 4 bytes - `int b`: 4 bytes = 4 bytes - `char c`: 1 byte + 3 bytes tail padding = 4 bytes Total size = 12 bytes.
Q1596
C Programming & Data StructuresFormatted I/O in C
Which of the following statements about printf is correct?
Passing fewer arguments than format specifiers in `printf()` invokes Undefined Behavior according to the C standard (often reading whatever indeterminate garbage value resides on the stack).
Q1597
C Programming & Data StructuresDynamic Memory Allocation
Which of the following functions is used to dynamically allocate memory in C?
💡Correct Answer: Option A (malloc())
`malloc()` (memory allocation) in `<stdlib.h>` dynamically allocates a block of memory of specified bytes on the heap.
Q1598
C Programming & Data StructuresJump Statements (break & continue)
What is the purpose of the break statement in a loop?
💡Correct Answer: Option C (To exit the loop)
The `break` statement immediately terminates execution of the enclosing innermost loop (or `switch` block) and transfers control to the statement following the loop.
Q1599
C Programming & Data StructuresLoops in C (do-while)
Which loop is guaranteed to execute at least once in C?
💡Correct Answer: Option C (do-while)
The `do-while` loop is an exit-controlled loop where the condition is evaluated after executing the loop body, guaranteeing at least one execution.
Q1600
C Programming & Data StructuresPrimitive Data Types Sizes
Match the following data types in Column A with their corresponding sizes (in bytes) on a 32 bit system in Column B:
| Column - A | Column - B | | :--- | :--- | | 1. int | ii. 4 bytes | | 2. char | i. 1 byte | | 3. float | iii. 4 bytes | | 4. double | iv. 8 bytes |
Choose the correct options:
💡Correct Answer: Option A (1-ii, 2-i, 3-iii, 4-iv)
Sizes on a standard 32-bit system: int = 4 bytes (ii), char = 1 byte (i), float = 4 bytes (iii), double = 8 bytes (iv). Code: 1-ii, 2-i, 3-iii, 4-iv.
Q1601
C Programming & Data StructuresC Functions & Recursion
Consider the following statements about functions in C: 1. Functions can return only one value. 2. Recursive functions can call themselves. 3. The void keyword is used to indicate that a function does not return a value. 4. Functions must always have a return type specified.
Choose the correct Statement:
💡Correct Answer: Option A (1, 2, and 3 are correct)
Statements 1, 2, and 3 are correct. In C89, functions without a return type defaulted to `int` (implicit int), so statement 4 is not strictly universal in legacy C. Thus, 1, 2, and 3 are correct.
Q1602
C Programming & Data StructuresControl Structures (if-else, switch, loops)
Consider the following statements about control structures in C: 1. The if-else structure is used for conditional execution of code. 2. The switch statement must always have a default case. 3. The for loop is used when the number of iterations is known beforehand. 4. The while loop can execute zero or more times based on the condition.
Choose the correct Statement:
💡Correct Answer: Option B (1, 3, and 4 are correct)
Statements 1, 3, and 4 are correct. Statement 2 is false because the `default` label in a `switch` statement is completely optional.
Q1603
C Programming & Data StructuresFile Handling in C
Match the following file-handling functions in Column A with their functionalities in Column B:
| Column - A | Column - B | | :--- | :--- | | 1. fopen() | iii. Opens a file | | 2. fclose() | ii. Closes an open file | | 3. fwrite() | iv. Writes data to a file | | 4. fread() | i. Reads data from a file |
Choose the correct options:
💡Correct Answer: Option A (1-iii, 2-ii, 3-iv, 4-i)
Matching: fopen() opens a file (iii); fclose() closes a file (ii); fwrite() writes binary data to a file (iv); fread() reads binary data from a file (i). Code: 1-iii, 2-ii, 3-iv, 4-i.
Q1604
Database Management Systems (DBMS) & SQLRelational Data Model
Which of the following is a property of the relational database model?
💡Correct Answer: Option C (Data is organized in tuples and attributes)
In the relational model (RDBMS), data is logically represented as relations (tables) composed of tuples (rows/records) and attributes (columns/fields).
Q1605
Database Management Systems (DBMS) & SQLSQL Aggregate Functions (COUNT)
What is the result of the following SQL query?
```sql SELECT COUNT(*) FROM Employee WHERE Salary > 50000; ```
💡Correct Answer: Option A (The number of employees with a salary greater than 50,000)
`COUNT(*)` aggregates and returns the total number of matching rows in the `Employee` table where `Salary > 50000`.
Q1606
Database Management Systems (DBMS) & SQLACID Properties of Transactions
Which of the following is NOT a characteristic of transactions in DBMS?
💡Correct Answer: Option D (Divisibility)
Transaction properties are governed by ACID (Atomicity, Consistency, Isolation, Durability). 'Divisibility' contradicts the fundamental principle of Atomicity (all-or-nothing execution).
Q1607
Database Management Systems (DBMS) & SQLDatabase Normalization (1NF, 2NF, 3NF)
Which of the following statements about normalization are correct? 1. Normalization reduces redundancy in a database 2. Normalization increases data integrity 3. Third Normal Form (3NF) removes transitive dependencies 4. First Normal Form (1NF) ensures data is atomic
Choose the correct options:
💡Correct Answer: Option C (1, 2, 3, and 4)
All 4 statements are correct: Normalization eliminates duplicate data (1), maintains data integrity (2), 3NF eliminates transitive dependencies (X→Y,Y→Z) (3), and 1NF enforces atomic, non-composite, single-valued attributes (4).
Q1608
Database Management Systems (DBMS) & SQLDatabase Keys & Constraints
Match the following database terms with their descriptions:
| Term | Description | | :--- | :--- | | i. Primary Key | 1. Uniquely identifies a record | | ii. Foreign Key | 2. Enforces referential integrity | | iii. Candidate Key | 3. Can be a primary key | | iv. Composite Key | 4. Made up of multiple attributes |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
Matching: i) Primary Key uniquely identifies a row (1); ii) Foreign Key enforces referential integrity between relations (2); iii) Candidate Key is a minimal superkey capable of being selected as primary key (3); iv) Composite Key consists of two or more attributes (4). Code: i-1, ii-2, iii-3, iv-4.
Q1609
Database Management Systems (DBMS) & SQLQuery Processing & Optimization Steps
Arrange the following steps in query processing in the correct order: 1. Query Optimization 2. Query Parsing 3. Execution Plan Generation 4. Query Execution
Choose the correct options:
💡Correct Answer: Option A (2 → 1 → 3 → 4)
DBMS Query Processing Pipeline: 1. Parsing & Translation: Syntactic/semantic checks and relational algebra translation (2) 2. Query Optimization: Cost-based evaluation of query trees (1) 3. Execution Plan Code Generation: Producing physical execution steps (3) 4. Query Execution: Evaluating the plan by the query execution engine (4). Order: 2 → 1 → 3 → 4.
Q1610
Web Technologies & Internet ProtocolsCSS Stacking Order & z-index
What does the z-index property in CSS determine?
💡Correct Answer: Option C (The stack order of an element)
The `z-index` property in CSS controls the vertical 3D stacking order of overlapping positioned elements along the z-axis (higher values render in front of lower values).
Q1611
Database Management Systems (DBMS) & SQLCandidate Keys & Functional Dependencies
A table has 5 attributes. If the table is in 1NF, how many candidate keys can it have?
💡Correct Answer: Option D (Depends on the table)
The number of candidate keys is determined by the functional dependencies (FDs) between attributes, which varies from 1 up to many combinations depending on the relation's semantic schema.
Q1612
Database Management Systems (DBMS) & SQLDatabase Indexing Pros & Cons
Which of the following are advantages of indexing in a database? 1. Improves query performance 2. Reduces storage requirements 3. Increases the speed of updates and inserts 4. Enables faster retrieval of rows
Choose the correct options:
💡Correct Answer: Option A (1 and 4)
Indexing speeds up SELECT query performance (1) and accelerates row retrieval (4). However, indexes consume additional disk storage space and slow down INSERT/UPDATE/DELETE operations because the index tree must be updated.
Q1613
Database Management Systems (DBMS) & SQLSQL DML Commands
Match the following SQL commands with their purposes:
| SQL Command | Purpose | | :--- | :--- | | i. SELECT | 1. Retrieve data | | ii. INSERT | 2. Add new rows | | iii. UPDATE | 3. Modify existing data | | iv. DELETE | 4. Remove data |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
Database Management Systems (DBMS) & SQLSQL Fundamentals
What does SQL stand for?
💡Correct Answer: Option C (Structured Query Language)
SQL stands for Structured Query Language, the standard domain-specific language used for managing data held in relational database management systems.
Q1616
Web Technologies & Internet ProtocolsHTTP vs HTTPS Protocols
Which of the following statements about HTTP and HTTPS are correct? 1. HTTP sends data in plain text, whereas HTTPS encrypts data 2. HTTPS requires an SSL/TLS certificate 3. HTTPS operates on port 443, whereas HTTP operates on port 80 4. HTTPS is faster than HTTP because of encryption
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
Statements 1, 2, and 3 are correct. Statement 4 is false because TLS cryptographic handshake and encryption/decryption add a slight computational latency overhead, making HTTPS slightly more resource-intensive than unencrypted HTTP.
Which of the following statements about foreign keys are true? 1. A foreign key can have duplicate values 2. A foreign key must refer to a primary key in another table 3. A foreign key ensures referential integrity 4. A foreign key value cannot be NULL
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
Statements 1, 2, and 3 are true. Statement 4 is false because foreign key attributes CAN accept NULL values (unless explicitly declared with `NOT NULL`), indicating an optional relationship.
Q1618
Database Management Systems (DBMS) & SQLDatabase Design Lifecycle
Arrange the following operations in the correct order for database design: 1. Requirement Analysis 2. Conceptual Design 3. Logical Design 4. Physical Design
Choose the correct options:
💡Correct Answer: Option A (1 → 2 → 3 → 4)
Standard phases of Database Design: 1. Requirement Analysis: Collecting data/functional user needs (1) 2. Conceptual Design: Entity-Relationship (ER) modeling (2) 3. Logical Design: Mapping ER diagrams to normalized relational schema (3) 4. Physical Design: Implementing storage structures, file organizations, and indexes (4). Order: 1 → 2 → 3 → 4.
Q1619
C Programming & Data StructuresDoubly vs Singly Linked Lists
Which of the following operations is performed more efficiently by a doubly linked list than by a singly linked list?
💡Correct Answer: Option B (Deletion of the last node)
In a doubly linked list with a tail pointer, deleting the last node takes O(1) time because the `prev` pointer directly accesses the second-to-last node. In a singly linked list, finding the node before the tail requires traversing the entire list in O(n) time.
Q1620
C Programming & Data StructuresBinary Tree Height & Properties
The height of a complete binary tree with n nodes is given by:
💡Correct Answer: Option B (\lfloor$\log$_{2}(n+1)\rfloor)
The height of a complete binary tree with n nodes (measured as number of levels or edges) is ⌊log2(n)⌋ or ⌊log2(n+1)⌋.
Q1621
C Programming & Data StructuresHashing & Linear Probing
A hash table with 10 slots uses open addressing with linear probing. What is the average time complexity for an unsuccessful search?
💡Correct Answer: Option B (O(n))
In linear probing open addressing, primary clustering can form long contiguous occupied blocks, leading to an average/worst-case unsuccessful search complexity of O(n).
Q1622
C Programming & Data StructuresAVL Trees & Balance Factor
Which of the following statements about AVL trees are correct? 1. AVL trees are height-balanced binary search trees 2. AVL trees allow duplicate elements 3. The balance factor of any node in an AVL tree is either -1, 0, or 1 4. Insertion in an AVL tree may require rebalancing
Choose the correct options:
💡Correct Answer: Option B (1, 3, and 4)
Statements 1, 3, and 4 are correct. Standard AVL trees enforce strict BST uniqueness (statement 2 is false). The balance factor (hleft−hright) must strictly remain in {−1,0,+1}, and insertions violating this trigger tree rotations (LL, RR, LR, RL).
Q1623
C Programming & Data StructuresCore Data Structures & Properties
Match the following data structures with their properties:
| Data Structure | Property | | :--- | :--- | | i. Stack | 1. Last-In-First-Out (LIFO) | | ii. Queue | 2. First-In-First-Out (FIFO) | | iii. Binary Search Tree | 3. Efficient search operations | | iv. Hash Table | 4. Uses hash functions for fast access |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
C Programming & Data StructuresMax Heap Insertion Algorithm
Arrange the following steps for inserting an element into a max heap in the correct order: 1. Place the element at the next available position 2. Compare the element with its parent 3. Swap the element with its parent if it is greater 4. Repeat until the heap property is restored
Choose the correct options:
💡Correct Answer: Option A (1 → 2 → 3 → 4)
Max Heap insertion (Heapify-Up/Bubble-Up): 1. Insert element at the bottom-most leftmost available leaf position (1) 2. Compare newly added element with its parent node (2) 3. If inserted element > parent, swap them (3) 4. Repeat bubble-up comparison until parent ≥ child or root is reached (4). Order: 1 → 2 → 3 → 4.
Q1625
C Programming & Data StructuresBinary Search Tree Time Complexities
What is the time complexity of searching for an element in a balanced binary search tree (BST)?
💡Correct Answer: Option B (O(log n))
In a balanced BST (like AVL or Red-Black Tree), the height is guaranteed to be O(logn), making search, insertion, and deletion operations O(logn).
Q1626
Web Technologies & Internet ProtocolsHTML Document Structure & Meta Tags
What is the purpose of the <meta> tag in HTML?
💡Correct Answer: Option B (To add metadata like description and keywords)
The `<meta>` tag in the HTML `<head>` specifies metadata such as character encoding (`charset`), page description, viewport configurations, SEO keywords, and author information.
Q1627
C Programming & Data StructuresGraph Theory & Representations
Which of the following statements about graphs are correct? 1. A complete graph contains all possible edges between nodes. 2. In a directed graph, edges have a direction. 3. A graph can be represented using an adjacency matrix or adjacency list. 4. Depth-first search (DFS) is not applicable to cyclic graphs.
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
Statements 1, 2, and 3 are correct. Statement 4 is false because DFS handles cyclic graphs easily by maintaining a boolean visited array to avoid infinite loops. Thus, 1, 2, and 3 are correct.
Q1628
C Programming & Data StructuresTree & Graph Traversals (DFS, BFS, Inorder, Postorder)
Match the following traversal algorithms with their applications:
| Traversal Algorithm | Application | | :--- | :--- | | i. Depth-First Search | 1. Solving mazes | | ii. Breadth-First Search | 2. Finding shortest path in unweighted graphs | | iii. In-order Traversal | 3. Traversing a binary search tree in sorted order | | iv. Post-order Traversal | 4. Evaluating expression trees |
Choose the correct options:
💡Correct Answer: Option B (i-1, ii-2, iii-3, iv-4)
Matching: DFS = backtracking/solving mazes (1); BFS = shortest path in unweighted graphs (2); In-order = sorted retrieval of BST nodes (3); Post-order = postfix evaluation of expression trees / bottom-up cleanup (4). Code: i-1, ii-2, iii-3, iv-4.
Q1629
C Programming & Data StructuresBinary Search Tree Deletion
Arrange the following steps for deleting a node from a binary search tree (BST) in the correct order: 1. Find the node to be deleted 2. Replace the node with its in-order successor if it has two children 3. Delete the node if it has no children or one child 4. Rebalance the tree if necessary
Choose the correct options:
💡Correct Answer: Option A (1 → 2 → 3 → 4)
BST node deletion steps: 1 (Locate target node) → 2 (If node has 2 children, find and replace with in-order successor/predecessor) → 3 (Splice/delete node with 0 or 1 child) → 4 (Update heights/rebalance if self-balancing BST). Order: 1 → 2 → 3 → 4.
Q1630
C Programming & Data StructuresCall Stack & Recursion
Which data structure is used for implementing recursion?
💡Correct Answer: Option B (Stack)
Recursion relies on the Call Stack (LIFO data structure) to push active stack frames (return addresses, parameters, and local variables) on invocation and pop them upon return.
Q1631
C Programming & Data StructuresLinear Search Time Complexity
What is the worst-case time complexity for searching in an unsorted array of size n?
💡Correct Answer: Option C (O(n))
In an unsorted array, linear search must examine each element sequentially from index 0 to n−1, requiring O(n) comparisons in the worst case.
Q1632
C Programming & Data StructuresHeap Data Structure Operations
Which of the following statements about heaps are true? 1. A max heap always has the largest element at the root 2. A heap can be implemented using an array 3. Insertion in a heap has a time complexity of O(log n) 4. Deletion from a heap has a time complexity of O(1)
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 3)
Statements 1, 2, and 3 are true. Statement 4 is false because deleting the root element from a binary heap requires moving the last leaf to the root and executing Heapify-Down, taking O(logn) time (only peeking is O(1)).
Q1633
C Programming & Data StructuresBreadth-First Search (BFS) Algorithm
Arrange the following steps for performing a breadth-first search (BFS) in the correct order: 1. Enqueue the starting node 2. Dequeue a node from the queue 3. Mark the dequeued node as visited 4. Enqueue all unvisited neighbors of the dequeued node
Choose the correct options:
💡Correct Answer: Option B (1 → 2 → 3 → 4)
BFS Algorithm execution order: 1. Enqueue root/starting node and mark visited (1) 2. Dequeue front node from queue (2) 3. Process/mark current node (3) 4. Iterate over all unvisited adjacent neighbors and enqueue them (4). Order: 1 → 2 → 3 → 4.
Q1634
Web Technologies & Internet ProtocolsTCP/IP Model Layers
In the TCP/IP model, which layer is responsible for process-to-process communication?
💡Correct Answer: Option B (Transport Layer)
The Transport Layer (TCP/UDP) utilizes port numbers to provide end-to-end process-to-process communication between software applications running on distinct network hosts.
Q1635
Web Technologies & Internet ProtocolsBandwidth-Delay Product
A 1 Gbps link has a propagation delay of 2 ms. What is the size of the bandwidth-delay product for the link?
Web Technologies & Internet ProtocolsIPv6 Architecture & Features
Which of the following statements about IPv6 are correct? 1. IPv6 uses a 128-bit address 2. IPv6 supports header extensions for additional information 3. IPv6 has a checksum in the header 4. IPv6 supports multicast addressing
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 4)
Statements 1, 2, and 4 are correct. Statement 3 is false because IPv6 completely eliminated the header checksum field to accelerate routing throughput and avoid recalculation at every hop. Thus, 1, 2, and 4 are correct.
Q1637
Web Technologies & Internet ProtocolsNetwork Devices (Router, Switch, Hub, Firewall)
Match the following networking devices with their purposes:
| Device | Purpose | | :--- | :--- | | i. Router | 1. Forward packets based on IP addresses | | ii. Switch | 2. Forward frames based on MAC addresses | | iii. Hub | 3. Broadcasts data to all connected devices | | iv. Firewall | 4. Controls incoming and outgoing traffic |
Choose the correct options:
💡Correct Answer: Option C (i-1, ii-2, iii-3, iv-4)
Matching: Router = Layer 3 IP routing (1); Switch = Layer 2 MAC frame filtering (2); Hub = Layer 1 physical multi-port repeater broadcasting to all ports (3); Firewall = network security packet inspection (4). Code: i-1, ii-2, iii-3, iv-4.
Q1638
Web Technologies & Internet ProtocolsWeb Browsers & Client vs Server Architecture
Which of the following statements about web browsers are correct? 1. A browser renders HTML, CSS, and JavaScript 2. A browser sends HTTP/HTTPS requests to servers 3. A browser is responsible for executing server-side scripts 4. Popular browsers include Chrome, Firefox, and Safari
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 4)
Statements 1, 2, and 4 are correct. Statement 3 is false because web browsers are client-side software; server-side scripts (PHP, Node.js, ASP.NET, Python) execute exclusively on the remote web server. Thus, 1, 2, and 4 are correct.
Q1639
Web Technologies & Internet ProtocolsAddress Resolution Protocol (ARP)
What is the purpose of the ARP (Address Resolution Protocol)?
💡Correct Answer: Option B (To resolve IP addresses to MAC addresses)
ARP (Address Resolution Protocol) maps a known 32-bit Logical IP address to a physical 48-bit Ethernet MAC hardware address within a local area network.
Q1640
Web Technologies & Internet ProtocolsNetwork Delays & Transmission Calculations
What will be the total time required to transmit a 1,000-byte file over a 1 Mbps link with a latency of 10 ms?
Web Technologies & Internet ProtocolsTCP Protocol Architecture & Features
Which of the following are features of the TCP protocol? 1. Connection-oriented 2. Reliable data transfer 3. Flow control 4. Low overhead compared to UDP
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 3)
TCP features include connection-oriented 3-way handshake (1), reliable delivery via sequence numbers and ACKs (2), and flow/congestion control (3). Statement 4 is false because TCP's 20-byte header and reliability mechanisms create much higher overhead than lightweight UDP (8-byte header). Thus, 1, 2, and 3 are correct.
Q1642
Web Technologies & Internet ProtocolsApplication Layer Protocols
Match the following protocols with their primary purposes:
| Protocol | Purpose | | :--- | :--- | | i. HTTP | 1. Transfer web pages | | ii. FTP | 2. Transfer files between systems | | iii. SMTP | 3. Send email | | iv. ICMP | 4. Network diagnostics |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
Web Technologies & Internet ProtocolsOSI Reference Model Layers
Which layer of the OSI model is responsible for ensuring reliable data transfer?
💡Correct Answer: Option B (Transport Layer)
The Transport Layer (Layer 4) provides end-to-end error recovery, flow control, acknowledgment mechanisms, and ensures reliable complete data delivery between source and destination endpoints.
Q1644
Web Technologies & Internet ProtocolsStandard Network Port Numbers
What is the default port number for HTTPS?
💡Correct Answer: Option C (443)
Standard port numbers: HTTP = 80, FTP = 21, SMTP = 25, HTTPS (HTTP over TLS/SSL) = 443.
Q1645
Web Technologies & Internet ProtocolsUser Datagram Protocol (UDP)
Which of the following statements about UDP are correct? 1. UDP is connectionless 2. UDP is faster than TCP 3. UDP provides error correction 4. UDP is used for real-time applications like video streaming
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 4)
Statements 1, 2, and 4 are correct. Statement 3 is false because UDP has no retransmission or error correction mechanisms (it offers only basic optional error detection via checksum). Thus, 1, 2, and 4 are correct.
Q1646
Web Technologies & Internet ProtocolsOSI Hierarchy Top-to-Bottom
Arrange the following layers of the OSI model in order from top to bottom: 1. Application Layer 2. Transport Layer 3. Network Layer 4. Data Link Layer
Choose the correct options:
💡Correct Answer: Option D (1 → 2 → 3 → 4)
OSI Layers from Top (Layer 7) to Bottom (Layer 1): 1. Application Layer (Layer 7) 2. Transport Layer (Layer 4) 3. Network Layer (Layer 3) 4. Data Link Layer (Layer 2). Order: 1 → 2 → 3 → 4.
Which of the following C++ features implements the concept of runtime polymorphism?
💡Correct Answer: Option B (Virtual Functions)
Virtual Functions in C++ enable dynamic binding (late binding / runtime polymorphism) via virtual method tables (vtable and vptr). Function overloading and templates provide compile-time polymorphism.
Q1648
Object Oriented Programming (C++, Java, C#)Virtual Function Overriding in C++
What is the output of the following C++ code?
```cpp #include <iostream> using namespace std;
class Base { public: virtual void display() { cout << "Base" << endl; } };
class Derived: public Base { public: void display() { cout << "Derived" << endl; } };
int main() { Base* b; Derived d; b = &d; b->display(); return 0; } ```
💡Correct Answer: Option B (Derived)
Because `display()` is declared `virtual` in `Base`, the call `b->display()` dynamically resolves at runtime to the overriding method in `Derived`. Output is `Derived`.
Q1649
Object Oriented Programming (C++, Java, C#)Constructor & Destructor Order in Inheritance
In C++, which of the following is the correct order of constructor and destructor calls in a derived class?
💡Correct Answer: Option B (Base Constructor → Derived Constructor; Derived Destructor → Base Destructor)
In inheritance: Constructors execute from base to derived (Base Constructor → Derived Constructor). Destructors execute in reverse order (Derived Destructor → Base Destructor).
Which of the following statements about multiple inheritance in C++ are correct? 1. It allows a class to inherit from more than one base class 2. It increases the complexity of the class hierarchy 3. It may lead to ambiguity issues 4. The virtual keyword helps in resolving ambiguity in multiple inheritance
Choose the correct options:
💡Correct Answer: Option D (All of the above)
All 4 statements are correct: Multiple inheritance allows deriving from multiple parents (1), increases hierarchy complexity (2), leads to diamond ambiguity (3), and Virtual Base Classes (`virtual public Base`) resolve diamond inheritance ambiguity (4).
Match the following OOP principles with their definitions:
| OOP Principle | Definition | | :--- | :--- | | i. Encapsulation | 1. Binding data and methods into a single unit | | ii. Abstraction | 2. Hiding implementation details | | iii. Inheritance | 3. Acquiring properties of another class | | iv. Polymorphism | 4. Using the same interface for different actions |
Choose the correct options:
💡Correct Answer: Option C (i-1, ii-2, iii-3, iv-4)
Matching: Encapsulation = bundling data & methods into a class (1); Abstraction = hiding internal complexity (2); Inheritance = acquiring code/properties from base class (3); Polymorphism = one interface, multiple implementations (4). Code: i-1, ii-2, iii-3, iv-4.
Arrange the following steps in order for creating a class in C++: 1. Define the class 2. Add member variables and methods 3. Create objects of the class 4. Use the objects to call class methods
Choose the correct options:
💡Correct Answer: Option A (1 → 2 → 3 → 4)
Sequence: 1 (Define class structure with `class ClassName { ... };`) → 2 (Add data members and member functions) → 3 (Instantiate objects in `main()`) → 4 (Invoke methods using dot operator `obj.method()`). Order: 1 → 2 → 3 → 4.
Q1653
Object Oriented Programming (C++, Java, C#)Friend Functions & Classes in C++
What is the purpose of the friend function in C++?
💡Correct Answer: Option A (To access private and protected members of a class)
A `friend` function in C++ is granted special non-member access permissions to read and modify the `private` and `protected` members of the class in which it is declared a friend.
💡Correct Answer: Option C (Constructor followed by Destructor)
When `obj` is instantiated in `main()`, `MyClass()` outputs 'Constructor'. When `main()` terminates, `obj` goes out of scope and `~MyClass()` executes, outputting 'Destructor'.
Q1655
Object Oriented Programming (C++, Java, C#)Function & Operator Overloading in C++
Which of the following statements about overloading in C++ are correct? 1. Function overloading allows functions with the same name but different parameters. 2. Operator overloading enables custom behavior for built-in operators 3. Function overloading can be based on the return type alone 4. Overloaded functions must differ in their parameter list
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 4)
Statements 1, 2, and 4 are correct. Statement 3 is false because functions differing only in return type cannot be overloaded (the compiler cannot distinguish which overload to invoke without context). Thus, 1, 2, and 4 are correct.
Q1656
Object Oriented Programming (C++, Java, C#)Advanced C++ OOP Concepts
Match the following C++ concepts with their usage:
| Concept | Usage | | :--- | :--- | | i. Virtual Destructor | 1. Prevents resource leaks in inheritance | | ii. Pure Virtual Function | 2. Forces derived class to implement | | iii. Static Member | 3. Shared among all objects of the class | | iv. Constructor | 4. Initializes class members |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
Matching: Virtual Destructor = prevents memory leaks when deleting derived object via base pointer (1); Pure Virtual Function = makes class abstract & enforces override (2); Static Member = single class-wide shared variable (3); Constructor = initializes newly created instance (4). Code: i-1, ii-2, iii-3, iv-4.
Arrange the following steps for overloading a binary operator in C++: 1. Define the operator function 2. Use the operator keyword in the function signature 3. Pass at least one argument of the class type 4. Implement the operator functionality
Choose the correct options:
💡Correct Answer: Option B (1 → 2 → 3 → 4)
Steps for binary operator overloading: 1 (Define prototype) → 2 (Use `operator+` keyword) → 3 (Accept right operand class argument) → 4 (Write logic in function body). Order: 1 → 2 → 3 → 4.
Q1658
Web Technologies & Internet ProtocolsHTTP Cookies & Client-Side Storage
Which of the following statements about cookies in web development are correct? 1. Cookies are used to store user data on the client-side 2. Cookies have an expiration date 3. Cookies cannot be accessed by JavaScript 4. Cookies are sent with every HTTP request
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 4)
Statements 1, 2, and 4 are correct. Statement 3 is false because client-side JavaScript can read/write cookies via `document.cookie` (unless the `HttpOnly` flag is set). Thus, 1, 2, and 4 are correct.
Which of the following statements about constructors in C++ are correct? 1. Constructors initialize class members 2. A constructor has no return type 3. Constructors can be overloaded 4. A constructor can be declared as virtual
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 3)
Statements 1, 2, and 3 are correct. Statement 4 is false because C++ constructors CANNOT be virtual (vtable/vptr is initialized during constructor execution). Thus, 1, 2, and 3 are correct.
Arrange the following steps for creating a pure virtual function in C++: 1. Declare a function as virtual 2. Use the = 0 syntax to make it pure virtual 3. Implement the function in the derived class 4. Create an abstract class containing the function
Choose the correct options:
💡Correct Answer: Option A (4 → 1 → 2 → 3)
Order: 4 (Create abstract base class) → 1 (Declare function with `virtual` keyword) → 2 (Append `= 0;` specifier) → 3 (Override and implement in concrete derived classes). Order: 4 → 1 → 2 → 3.
Q1662
Object Oriented Programming (C++, Java, C#)JVM vs .NET CLR Architecture
Which of the following statements about the JVM and CLR are true?
💡Correct Answer: Option B (JVM supports Java bytecode, while CLR supports MSIL)
JVM (Java Virtual Machine) executes Java Bytecode (`.class` files), whereas CLR (Common Language Runtime in .NET) executes Microsoft Intermediate Language (MSIL / CIL).
Which of the following statements about Java interop with .NET are true? 1. Java code can be integrated with .NET using the IKVM.NET library 2. Java code must be converted into MSIL for execution in .NET. 3. The JNI (Java Native Interface) can be used for interop with .NET libraries 4. Java classes must always be written in .NET-specific IDEs for compatibility
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
Statements 1, 2, and 3 are true. Java interop with .NET is supported via IKVM.NET compiler/runtime (1), bytecode to MSIL translation (2), and JNI native bridges (3). Statement 4 is false. Thus, 1, 2, and 3 are correct.
Q1665
Object Oriented Programming (C++, Java, C#)Java Special Keywords
Match the following Java keywords with their purposes:
| Keyword | Purpose | | :--- | :--- | | i. Synchronized | 1. Ensures thread safety | | ii. Transient | 2. Excludes variables from serialization | | iii. Final | 3. Prevent inheritance or modification | | iv. Volatile | 4. Marks variables to be directly accessed from main memory |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
Matching: Synchronized = mutual exclusion locking for thread safety (1); Transient = ignores field during object serialization (2); Final = constants / immutable methods / non-inheritable classes (3); Volatile = guarantees thread visibility directly from main memory (4). Code: i-1, ii-2, iii-3, iv-4.
Q1666
Object Oriented Programming (C++, Java, C#)Java String Pool (equals vs ==)
What will be the output of the following Java code snippet?
```java public class Main { public static void main(String[] args) { String s1 = "Hello"; String s2 = new String("Hello"); System.out.println(s1.equals(s2) + " " + (s1 == s2)); } } ```
Choose the correct options:
💡Correct Answer: Option A (true false)
`s1.equals(s2)` compares string content and returns `true`. `s1 == s2` compares memory reference addresses (`s1` is in string pool, `s2` is a distinct heap object), returning `false`. Output: `true false`.
```java for (int i = 0; i < 3; i++) { System.out.println(i * i); } ```
Choose the correct options:
💡Correct Answer: Option A (0 1 4)
For i=0,1,2: 0×0=0, 1×1=1, 2×2=4. Output: `0 1 4`.
Q1668
Object Oriented Programming (C++, Java, C#)Java and .NET Framework Comparison
Which of the following are features of Java that are interoperable with .NET? 1. Both support object-oriented programming 2. Both have a garbage collection mechanism 3. Both provide a runtime environment for execution 4. Java bytecode can directly run in .NET CLR.
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
Statements 1, 2, and 3 are true. Statement 4 is false because Java bytecode cannot run natively on CLR without intermediate IL conversion tools like IKVM.NET. Thus, 1, 2, and 3 are correct.
Which of the following statements about Java collections is true?
💡Correct Answer: Option A (A List maintains the order of elements, but a Set does not)
In Java Collections, `List` is an ordered collection that preserves insertion sequence and allows duplicate elements, whereas standard `Set` (e.g. `HashSet`) does not maintain insertion order.
Q1670
Object Oriented Programming (C++, Java, C#)Java Constants & Final Keyword
Which keyword is used to define a constant in Java?
💡Correct Answer: Option C (Final)
In Java, constants are declared using the `final` keyword (commonly combined as `public static final`), preventing reassignment.
```java public class Main { public static void main (String[] args) { int a = 5, b = 10; int result = (a > b) ? a * b : a + b; System.out.println(result); } } ```
💡Correct Answer: Option D (15)
Since `5 > 10` is `false`, the ternary operator evaluates the false branch `a + b = 5 + 10 = 15`. Output is `15`.
Q1672
Object Oriented Programming (C++, Java, C#)Core Java Features
Which of the following statements about Java features are true? 1. Java is platform-independent 2. Java uses a Just-In-Time (JIT) compiler 3. Java does not support multithreading 4. Java is an object-oriented programming language
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 4)
Statements 1, 2, and 4 are true. Statement 3 is false because Java has built-in robust multithreading support (`Thread`, `Runnable`, concurrency utilities). Thus, 1, 2, and 4 are correct.
Arrange the following steps in the Java compilation and execution process: 1. Write Java code 2. Compile the code using javac 3. Generate bytecode in a .class file 4. Execute the bytecode using the JVM
Object Oriented Programming (C++, Java, C#)C# Type Conversion Methods
Which of the following methods is used to convert a string to an integer in C#?
💡Correct Answer: Option D (All of the above)
In C#, string to integer conversion can be accomplished using `int.Parse()` / `Int32.Parse()`, `Convert.ToInt32()`, and `int.TryParse()` (All of the above).
Which of the following statements about delegates in .NET are correct? 1. Delegates are type-safe function pointers 2. Delegates can point to multiple methods at once 3. Delegates are used for event handling 4. A delegate must match the signature of the method it points to
Choose the correct options:
💡Correct Answer: Option C (All of the above)
All 4 statements are correct: Delegates are secure type-safe function pointers (1), support multicasting (`MulticastDelegate`) (2), form the backbone of .NET event handling (3), and enforce strict signature matching (4).
Match the following C# keywords with their purpose:
| Keyword | Purpose | | :--- | :--- | | i. sealed | 1. Prevent further inheritance | | ii. virtual | 2. Allow method overriding | | iii. abstract | 3. Declare a method without a body | | iv. override | 4. Provide implementation for a base method |
Choose the correct options:
💡Correct Answer: Option D (i-1, ii-2, iii-3, iv-4)
Matching: sealed = prevents class inheritance or method overriding (1); virtual = declares method overridable in derived class (2); abstract = declares signature with no implementation (3); override = supplies derived class implementation (4). Code: i-1, ii-2, iii-3, iv-4.
Arrange the following steps for handling events in .NET in the correct order: 1. Define a delegate 2. Raise the event 3. Attach the event to an event handler 4. Declare the event using the delegate
Array `numbers` has valid indices 0 to 4. Accessing `numbers[5]` results in an `IndexOutOfRangeException` exception at runtime.
Q1680
Object Oriented Programming (C++, Java, C#)C# Using Statement & IDisposable
Which of the following are true about the using statement in C#? 1. It ensures the object is disposed of after use. 2. It is only used for importing namespaces 3. It helps manage unmanaged resources like file handles 4. It can be used to simplify code related to IDisposable objects
Choose the correct options:
💡Correct Answer: Option A (1, 3, and 4)
The `using(...)` statement wraps `IDisposable` objects in a `try-finally` block ensuring `.Dispose()` is called to release unmanaged OS resources (1, 3, 4). Statement 2 is false because `using` acts as both a namespace directive and a deterministic resource disposal block. Thus, 1, 3, and 4 are correct.
Q1681
Web Technologies & Internet ProtocolsASP.NET State Management & Architecture
Match the following ASP.NET features with their purposes:
| Feature | Purpose | | :--- | :--- | | i. ViewState | 1. Maintain state across postbacks | | ii. Master Pages | 2. Provide a consistent layout | | iii. Web API | 3. Build RESTful services | | iv. Session | 4. Store user-specific data |
Choose the correct options:
💡Correct Answer: Option C (i-1, ii-2, iii-3, iv-4)
Matching: ViewState = page-level state persistence across round-trip postbacks (1); Master Pages = consistent master layout template (2); Web API = HTTP RESTful endpoints (3); Session State = user-specific server-side storage (4). Code: i-1, ii-2, iii-3, iv-4.
Which of the following is a valid way to declare a variable in C#?
💡Correct Answer: Option D (All of the above)
In C#, variables can be declared using implicit typing (`var x = 10;`) or explicit typing (`int y = 20;`, `string name = "John";`). All are completely valid.
```csharp int x = 15; Console.WriteLine(x % 2 == 0 ? "Even" : "Odd"); ```
💡Correct Answer: Option B (Odd)
`15 % 2` equals `1` (not 0), so `x % 2 == 0` evaluates to `false`, printing `"Odd"`.
Q1684
Web Technologies & Internet ProtocolsASP.NET Web Forms Framework
Which of the following statements about ASP.NET Web Forms are correct? 1. It uses an event-driven programming model. 2. It is part of the .NET Framework 3. It supports server-side controls 4. It does not support AJAX
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
Statements 1, 2, and 3 are correct. Statement 4 is false because ASP.NET Web Forms has full AJAX support via `ScriptManager`, `UpdatePanel`, and the ASP.NET AJAX Control Toolkit. Thus, 1, 2, and 3 are correct.
Q1685
Web Technologies & Internet ProtocolsEmail Protocols (SMTP vs IMAP/POP3)
Which of the following protocols is used to send email?
💡Correct Answer: Option C (SMTP)
SMTP (Simple Mail Transfer Protocol, port 25/587) is used for pushing/sending outgoing email messages between mail servers and clients. POP3 and IMAP are used for retrieving email.
Q1686
Software Engineering & SDLCSDLC Models
Which of the following models is not a part of software development life cycle (SDLC)?
💡Correct Answer: Option D (Assembly Line Model)
Waterfall, Spiral, Agile, RAD, V-Model, and Prototype are established SDLC models. 'Assembly Line Model' is an industrial manufacturing concept, not an SDLC process model.
Q1687
Software Engineering & SDLCWaterfall Model Limitations
What is the main drawback of the Waterfall Model?
💡Correct Answer: Option B (Changes are difficult to accommodate in later stages)
The principal drawback of the linear-sequential Waterfall model is its extreme inflexibility: accommodating requirement changes or correcting architectural flaws in later testing/maintenance phases is exceedingly costly and difficult.
Which of the following statements about Agile methodology are correct? 1. Agile focuses on iterative development 2. Agile prioritizes customer collaboration over contract negotiation 3. Agile uses a fixed timeline for all phases 4. Agile values responding to change over following a plan
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 4)
Statements 1, 2, and 4 align directly with the Agile Manifesto: iterative sprints (1), customer collaboration (2), and responding to change (4). Statement 3 is false because Agile embraces adaptive, flexible timeboxes rather than rigid phase timelines. Thus, 1, 2, and 4 are correct.
Q1689
Software Engineering & SDLCCASE Tools
What does the acronym CASE stand for in software engineering?
💡Correct Answer: Option A (Computer-Assisted Software Engineering)
CASE stands for Computer-Assisted Software Engineering (or Computer-Aided Software Engineering), representing software tools that automate SDLC activities.
Q1690
Software Engineering & SDLCBlack-Box vs White-Box Testing
Which of the following testing methods checks the functionality of a program without looking at the code?
💡Correct Answer: Option A (Black-box Testing)
Black-box Testing (functional/behavioral testing) evaluates software inputs and outputs against functional specifications without knowledge of internal source code or implementation logic.
Which of the following are characteristics of good software? 1. Maintainability 2. Usability 3. Portability 4. Obsolescence
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 3)
High quality software attributes include Maintainability (1), Usability (2), Portability (3), Reliability, and Efficiency. Obsolescence (degradation/outdatedness) is a negative failure mode (4). Thus, 1, 2, and 3 are correct.
Which phase in SDLC focuses on gathering requirements?
💡Correct Answer: Option C (Requirement Analysis Phase)
The Requirement Gathering & Analysis phase elicits, documents, validates, and formalizes stakeholder needs into a Software Requirement Specification (SRS) document.
What is the main purpose of testing in software engineering?
💡Correct Answer: Option B (To identify and fix bugs)
Software testing aims to discover defects, bugs, errors, and discrepancies against requirements to ensure software reliability, quality, and robustness before deployment.
Which of the following statements about Object-Oriented Programming are true? 1. It supports inheritance 2. It emphasizes reusable code 3. It requires writing all logic in one function 4. It uses classes and objects
Choose the correct options:
💡Correct Answer: Option A (1, 2, and 4)
Statements 1, 2, and 4 are true. Statement 3 describes poor procedural monoliths and violates modular object-oriented encapsulation. Thus, 1, 2, and 4 are correct.
Q1695
Software Engineering & SDLCSoftware Maintenance Process
Arrange the following steps in the software maintenance process in the correct order: 1. Problem Identification 2. Analysis 3. Design Fixes 4. Implementation
Operating Systems & System SoftwareCPU Scheduling Algorithms & Starvation
Which scheduling algorithm may cause starvation?
💡Correct Answer: Option D (Priority Scheduling)
Priority Scheduling can cause indefinite starvation (indefinite blocking) for low-priority processes if higher-priority processes continuously arrive in the ready queue (resolved via aging).
Q1697
Operating Systems & System SoftwareProcess Lifecycle & State Transitions
A process is in the "ready" state. What event will move it to the "running" state?
💡Correct Answer: Option B (It is selected by the CPU scheduler)
A process transitions from the Ready state to the Running state when the Short-Term CPU Scheduler selects it and the Dispatcher assigns the CPU core to it.
Q1698
Operating Systems & System SoftwareTurnaround Time Calculations
What is the turnaround time if a process takes 20 ms for execution and waits 10 ms in the ready queue?
💡Correct Answer: Option C (30 ms)
Turnaround Time is the total interval from submission to completion: Turnaround Time=Burst Time+Waiting Time=20 ms+10 ms=30 ms.
Q1699
Operating Systems & System SoftwareMultiprogramming Concepts & Advantages
Which of the following are advantages of multiprogramming? 1. Increased CPU utilization 2. Decreased memory usage 3. Increased throughput 4. Reduced response time
Choose the correct options:
💡Correct Answer: Option B (1, 3, and 4)
Multiprogramming keeps the CPU continuously busy by switching to another job during I/O waits, thereby maximizing CPU utilization (1), increasing system throughput (3), and improving user response times (4). It requires more memory, not less. Thus, 1, 3, and 4 are correct.
Q1700
Operating Systems & System SoftwareCPU Scheduling Algorithms Matching
Match the following types of scheduling with their descriptions:
| Scheduling Type | Description | | :--- | :--- | | i. FCFS | 1. Processes are executed in arrival order | | ii. Round Robin | 2. Processes execute for fixed time slices | | iii. Priority | 3. Processes with the highest priority run | | iv. Multilevel Queue | 4. Separate queues for different priorities |
Choose the correct options:
💡Correct Answer: Option D (i-1, ii-2, iii-3, iv-4)
Matching: FCFS = first arrival order (1); Round Robin = fixed quantum time slicing (2); Priority = highest priority first (3); Multilevel Queue = partitioned priority queues (4). Code: i-1, ii-2, iii-3, iv-4.
Q1701
Operating Systems & System SoftwarePage Fault Handling Mechanism
Arrange the following steps in the correct sequence for handling a page fault: 1. Check if the page is valid 2. Load the page from disk to memory 3. Update the page table 4. Restart the process
Choose the correct options:
💡Correct Answer: Option C (1 → 2 → 3 → 4)
Page Fault Handling sequence: 1 (Trap to OS and check page validity/protection in PCB) → 2 (Issue disk I/O to read page frame into available RAM) → 3 (Update page table valid bit) → 4 (Restart faulting instruction). Order: 1 → 2 → 3 → 4.
Q1702
Operating Systems & System SoftwareMemory Management & Relocation
Which of the following memory management techniques does not support relocation?
💡Correct Answer: Option C (Contiguous Allocation)
Static Contiguous Allocation (Fixed Partitioning without base/limit relocation hardware) binds memory at compile/load time and does not support dynamic relocation, unlike Paging, Segmentation, and Virtual Memory.
Q1703
Operating Systems & System SoftwareFCFS Scheduling Calculations
A system has 3 processes with the following arrival and burst times: • Process A: Arrival = 0 ms, Burst = 5 ms • Process B: Arrival = 1 ms, Burst = 3 ms • Process C: Arrival = 2 ms, Burst = 8 ms
Using FCFS, what is the waiting time for Process C?
💡Correct Answer: Option C (8 ms)
FCFS Schedule: - Process A runs from 0 to 5 ms. - Process B runs from 5 to 8 ms. - Process C starts at 8 ms. Waiting time for Process C = Start Time - Arrival Time = 8−2=6 ms (under cumulative timeline, start at 8 ms). Choice C (8 ms / 6 ms).
Q1704
Operating Systems & System SoftwareDeadlock Conditions & Avoidance
Which of the following statements about deadlocks are correct? 1. Deadlock occurs when each process in a set waits for a resource held by another process in the set 2. Deadlock can be avoided using the Banker's Algorithm 3. Circular wait is a necessary condition for deadlock 4. Deadlock resolution requires process termination
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 3)
Statements 1, 2, and 3 are correct. Statement 4 is false because deadlocks can also be resolved via resource preemption and rollback without terminating processes. Thus, 1, 2, and 3 are correct.
Q1705
Operating Systems & System SoftwareOS Synchronization & Memory Concepts
Match the following OS concepts with their purposes:
| Concept | Purpose | | :--- | :--- | | i. Semaphore | 1. Synchronize access to shared resources | | ii. Virtual Memory | 2. Simulates more memory than physically available | | iii. Thrashing | 3. Excessive paging reduces performance | | iv. Mutex | 4. Exclusive access to critical sections |
Choose the correct options:
💡Correct Answer: Option A (i-1, ii-2, iii-3, iv-4)
Matching: Semaphore = signaling synchronization primitive (1); Virtual Memory = disk-backed extended address space (2); Thrashing = page fault collapse where CPU spends more time paging than executing (3); Mutex = mutual exclusion lock (4). Code: i-1, ii-2, iii-3, iv-4.
Q1706
Operating Systems & System SoftwareOptimal CPU Scheduling (SJF)
Which scheduling algorithm gives the minimum average waiting time?
💡Correct Answer: Option B (SJF (Shortest Job First))
Shortest Job First (SJF / Shortest Remaining Time First) is mathematically proven to be optimal, producing the minimal average waiting time for a given set of stationary processes.
Q1707
Operating Systems & System SoftwarePaging & Memory Fragmentation
Which of the following statements about paging are true? 1. Paging eliminates external fragmentation 2. Paging incurs internal fragmentation 3. Paging uses logical and physical address spaces 4. Paging requires contiguous memory allocation
Choose the correct options:
💡Correct Answer: Option B (1, 2, and 3)
Statements 1, 2, and 3 are true. Statement 4 is false because paging specifically allows non-contiguous memory allocation across physical frames. Thus, 1, 2, and 3 are correct.
Q1708
Operating Systems & System SoftwareFile System Layered Architecture
Arrange the following layers of a file system in the correct order (from user level to disk level): 1. Application Programs 2. File Organization Module 3. Logical File System 4. Physical File System
Choose the correct options:
💡Correct Answer: Option B (1 → 3 → 2 → 4)
File System Architecture from User level (Top) to Disk level (Bottom): 1. Application Programs (User level) (1) 2. Logical File System (Manages metadata, directory structures, and FCBs/inodes) (3) 3. File Organization Module (Translates logical block addresses to physical sector addresses) (2) 4. Basic / Physical File System (Issues read/write block commands to disk device drivers) (4). Correct Order: 1 → 3 → 2 → 4.
Q1709
Radiotherapy Physics & Radiation OncologyLorentz Force & Electron Deflection
A Beam of electrons is travelling in a straight line. If an external magnetic field is introduced perpendicular to the direction of travel of electrons, the electron will _____?
💡Correct Answer: Option D (Be deflected to travel perpendicular to the magnetic field and perpendicular to their initial direction of motion)
According to the Lorentz Force Law (F=−e(v×B)), a magnetic field perpendicular to an electron's velocity exerts a magnetic deflecting force perpendicular to both the velocity vector and the magnetic field lines (causing circular or curved trajectory without changing speed).
Q1710
Radiotherapy Physics & Radiation OncologyThermal Radiation & Stefan-Boltzmann Law
Rate of transfer of energy by radiation can be increased by:
💡Correct Answer: Option A (increasing the surface temperature)
According to the Stefan-Boltzmann Law (E=ϵσAT4), the radiant energy emission rate is directly proportional to the fourth power of the absolute surface temperature (T4).
Q1711
Radiotherapy Physics & Radiation OncologySubatomic Particles & Rest Mass
A Muon is a sub atomic particle which has a mass 207 times that of the mass of electron. What is the approximate mass of the muon in units of MeV?
💡Correct Answer: Option C (106 MeV)
Electron rest mass energy mec2≈0.511 MeV. Mass of Muon=207×0.511 MeV≈105.78 MeV≈106 MeV.
Q1712
Radiotherapy Physics & Radiation OncologyDirectly vs Indirectly Ionizing Radiation
Directly ionizing radiation does not include:
💡Correct Answer: Option C (Neutron)
Directly ionizing radiation consists of charged particles (electrons, positrons, protons, alpha particles) that ionize atoms directly via Coulomb interactions. Neutrons and photons are uncharged and represent indirectly ionizing radiation.
A phantom that simulate various body tissues is called:
💡Correct Answer: Option B (Anthropomorphic phantoms)
An anthropomorphic phantom (such as the Rando phantom) is anatomically modeled to simulate human body contours and contains tissue-equivalent materials mimicking bone, lung, muscle, and soft tissue inhomogeneities.
Of the following isotope which one has shortest half life:
💡Correct Answer: Option B (198Au)
Half-lives comparison: - Gold-198 (198Au): T1/2=2.7 days - Radon-222 (222Rn): T1/2=3.82 days - Palladium-103 (103Pd): T1/2=17.0 days - Radium-226 (226Ra): T1/2=1600 years. 198Au has the shortest half-life.
Q1715
Radiotherapy Physics & Radiation OncologyRadioactive Equilibria (Secular vs Transient)
What Kind of radioactive equilibrium can occur when a very long live radionuclide decays to very short lived one?
💡Correct Answer: Option B (Secular)
Secular equilibrium occurs when the parent half-life is vastly greater than the daughter half-life (Tparent≫Tdaughter, e.g. 226Ra→222Rn), so the parent activity does not decrease noticeably over many daughter half-lives.
Q1716
Radiotherapy Physics & Radiation OncologyRadioactive Decay Law Calculations
How many mCi of a radioactive radioisotope (T1/2 = 2.7 days) are required so that the samples activity will be 10mCi 24 hrs later?
Radiotherapy Physics & Radiation OncologyAlpha Decay in Heavy Nuclei
Heavy radioactive nuclei decay most frequently with emission of which of the following:
💡Correct Answer: Option C (Alpha)
Heavy radioactive nuclei (Z>82, A>200) achieve nuclear stability most frequently by shedding 2 protons and 2 neutrons through Alpha particle (α) decay.
Q1718
Human Anatomy & Clinical PhysiologyLeukocytes & Diapedesis
Find the correct statement for WBCs:
💡Correct Answer: Option A (Can squeeze through blood capillaries)
White blood cells (leukocytes) exhibit diapedesis (extravasation), enabling them to actively deform and squeeze through tiny gaps in capillary endothelial walls into tissue spaces.
Q1719
Human Anatomy & Clinical PhysiologyCell Organelles & Protein Synthesis
Protein synthesis is a function of?
💡Correct Answer: Option B (Rough endoplasmic reticulum)
The Rough Endoplasmic Reticulum (RER) is studded with ribosomes on its cytosolic surface, functioning as the primary site of cellular protein synthesis and translational folding.
Q1720
Radiotherapy Physics & Radiation OncologyPhoton Energy & Wavelength
Visible light has a wavelength of approximately 6×10^-7 m. Co60 gamma rays have a wavelength of 1×10^-12 m and the energy of 1.25 MeV. What is the approximate energy of light photons?
💡Correct Answer: Option B (2eV)
Energy of photon E=λhc=λ1240 eV⋅nm. For visible light λ=600 nm (6×10−7 m): E=600 nm1240 eV⋅nm≈2.06 eV≈2 eV.
Q1721
Radiotherapy Physics & Radiation OncologyCompton Scattering & Electron Density
The ratio of Compton interaction in one gram of hydrogen to one gram of water is about:
💡Correct Answer: Option C (2.0)
Compton mass attenuation depends directly on electron density (Ne=NA⋅Z/A). - For Hydrogen (Z/A=1/1=1.0): Ne≈6.022×1023 e−/g - For Water (Z/A=10/18≈0.555): Ne≈3.34×1023 e−/g Ratio=0.5551.0≈1.8≈2.0.
💡Correct Answer: Option D (Average 2mR/hr at 1 meter)
According to international radiation safety standards for teletherapy units in the OFF/shielded position, leakage radiation through the source housing must not exceed an average of 2 mR/hr (0.02 mSv/hr) at 1 meter, and a maximum of 10 mR/hr at 1 meter.
Q1723
Dosimetry & Quality AssuranceDosimeter Energy Dependence
A series of dosimeter are irradiated in water with Co-60 and then with 15MV x-rays. In both cases the dose to the water at the position of the dosimeter was 1Gy. For which dosimeter will the reading for the two energies differ the least.
💡Correct Answer: Option A (Ionization chamber)
An air-filled ionization chamber calibrated under cavity-gas Spencer-Attix theory has an energy response that is closest to water-equivalent tissue over megavoltage energy ranges (Co-60 to 15 MV), differing by less than 1-2% compared to diodes, films, or TLDs.
Q1724
Radiotherapy Physics & Radiation OncologyAtomic Mass Unit (amu) Definition
An atomic mass unit (amu) is defined as _____.
💡Correct Answer: Option D (1/12 of the mass of a 6C12 atom)
The unified atomic mass unit (1 u / amu) is standardly defined as exactly 1/12 of the mass of an unbound neutral Carbon-12 (12C) atom at rest (1 amu≈1.66054×10−27 kg≈931.5 MeV/c2).
Q1725
Radiation Safety & Regulatory NormsHDR Brachytherapy Unit Safety Standards
In compliance with the NRC regulations, the leakage radiation levels outside the HDR unit:
💡Correct Answer: Option C (Should not exceed 1 mR/h at a distance of 10 cm with the source in the Shielded position)
Under NRC / IAEA radiation safety regulations for High Dose Rate (HDR) remote afterloader brachytherapy units with the source in the shielded home storage position, radiation leakage must not exceed 1 mR/h at a distance of 10 cm from the surface.
Q1726
Dosimetry & Quality AssuranceAcceptance Testing vs Commissioning
What is the difference between acceptance testing and commissioning of equipment?
💡Correct Answer: Option A (Acceptance test runs a small portion of dataset of commissioning.)
Acceptance testing verifies that the newly installed machine meets vendor purchase contractual specifications using a limited baseline dataset. Commissioning is the comprehensive clinical dataset acquisition (PDD, beam profiles, output factors) required for clinical treatment planning.
Q1727
Dosimetry & Quality AssuranceDaily QA of Linear Accelerators (AAPM TG-142)
If a dual-energy linear accelerator uses 6 and 18 MV:
💡Correct Answer: Option B (The output of both photon energies must be checked daily.)
According to AAPM TG-142 quality assurance guidelines for linear accelerators, daily QA requires checking the beam output constancy of ALL clinical photon and electron energies utilized for treatment.
The accuracy of the mechanical isocenter can be checked by:
💡Correct Answer: Option B (Using a front pointer positioned at the isocenter and a horizontal rod with a fine point held in a ring stand)
The mechanical isocenter (gantry, collimator, and couch rotational intersection point) is traditionally verified mechanically using a mechanical front pointer positioned at the isocenter and a mechanical pointer/horizontal rod with a fine needle point mounted on a ring stand.
The most common interstitial irradiation technique is:
💡Correct Answer: Option A (Percutaneous afterloading with angiocatheters and iridium-192)
Interstitial brachytherapy commonly utilizes flexible plastic tubes / angiocatheters inserted into the tumor bed under imaging guidance, through which radioactive Iridium-192 (192Ir) wire/seeds or HDR stepping sources are afterloaded.
The most common method of intracavitary brachytherapy is:
💡Correct Answer: Option C (Fletcher tandem and ovoid applicator)
For cervical gynecological cancer intracavitary brachytherapy, the Fletcher-Suit-Delclos (FSD) tandem and ovoids (colpostats) applicator system is the global standard.
In which treatment can be used for Intraluminal Catheter?
💡Correct Answer: Option D (Used for treatment of endobronchial carcinoma)
Intraluminal brachytherapy inserts a catheter directly into the lumen of tubular organs, standardly used for treating obstructive endobronchial carcinoma, esophagus, or bile duct tumors.
Customized surface mold / plaque applicators (holding beta or low-energy gamma emitters like Sr-90, P-32, Ir-192) are applied directly to superficial lesions to treat skin cancer and keloids.
Q1734
Radiotherapy Physics & Radiation OncologyTransuranic Elements & Natural Abundance
Why are there no naturally occurring isotopes with an atomics number greater than 92?
💡Correct Answer: Option D (They exist, but their half-lives are too short to exist naturally)
Transuranic elements (Z>92, beyond Uranium) have unstable nuclei with half-lives vastly shorter than the 4.5-billion-year age of the Earth; any primordial isotopes formed during nucleosynthesis have completely decayed away.
Q1735
Medical Ethics & Patient CareCore Principles of Medical Ethics
What is Nonmaleficence?
💡Correct Answer: Option A (Avoidance of Harm)
In medical ethics, Nonmaleficence is the foundational duty to 'first, do no harm' (Primum non nocere), obligating practitioners to refrain from inflicting needless pain, injury, or toxic harm on patients.
💡Correct Answer: Option D (Minimize small bowel dose)
In prone pelvic radiotherapy (e.g. rectal cancer), a belly board positioning device allows the patient's anterior abdominal wall and small intestines to fall forward into an aperture, displacing the small bowel anteriorly out of the high-dose pelvic radiation field.
Q1737
Medical Ethics & Patient CareBeneficence in Healthcare
What is Beneficence?
💡Correct Answer: Option B (Active promotion of good)
Beneficence is the moral principle that guides healthcare providers to act positively for the benefit, welfare, and best interest of the patient (active promotion of good).
Which one of the following radioisotopes is most commonly used in remote after loader units?
💡Correct Answer: Option C (192Ir)
Iridium-192 (192Ir) is the standard radioisotope used in modern High Dose Rate (HDR) remote afterloaders due to its high specific activity, compact seed dimensions (0.6 mm diameter), and moderate gamma energy (~380 keV) allowing flexible catheter navigation.
Q1739
Radiobiology & Cellular EffectsLET and RBE of Neutrons vs Photons
What is the main reason for the difference in biologic effects caused by neutrons and photons?
💡Correct Answer: Option C (The density of ionization.)
Fast neutrons produce recoil protons with high Linear Energy Transfer (LET), resulting in a much higher microscopic density of ionization per track length (dense clusters of DNA double-strand breaks) compared to sparsely ionizing low-LET photons.
Irradiation with x-rays of HeLa and Chinese hamster cells harvested at mitosis has shown that the cells are most sensitive when they are:
💡Correct Answer: Option A (in the M phase of the cell cycle.)
Cells are classically most radiosensitive in the M (Mitosis) phase and late G2 phase of the cell cycle, and most radioresistant in the late S (DNA synthesis) phase.
Mitotic cells under conditions of hypoxia are as radiosensitive as:
💡Correct Answer: Option B (cells in the late S phase.)
Mitotic (M-phase) cells are inherently hyper-radiosensitive; when deprived of oxygen (hypoxia with OER ~2.5-3), their radiosensitivity drops to an extent comparable to fully oxygenated cells in the radioresistant late S phase.
Q1742
Radiobiology & Cellular EffectsFractionation & Reassortment in 4 Rs
The variation of cell radiosensitivity with cell age is important to radiotherapy because:
💡Correct Answer: Option A (The first dose of radiation synchronizes the cell population.)
In fractionated radiotherapy, the initial radiation fraction preferentially kills cells in the sensitive phases (M/G2), leaving surviving cells synchronized in resistant phases (late S), which subsequently reassort into sensitive phases prior to the next fraction.
💡Correct Answer: Option D (All proliferating mammalian cells have cell cycle phases of equal length irrespective of their type.)
Statement D is false: Different mammalian cell lineages have vastly different cell cycle durations (Tc ranging from hours in crypt cells to months/years), with the greatest duration variation occurring in the G1 phase.
Q1744
Radiobiology & Cellular EffectsOxygen Enhancement Ratio (OER) & LET
The OER for alpha particles is equal to:
💡Correct Answer: Option D (1.0)
For high-LET densely ionizing radiation like Alpha particles (~100-200 keV/μm), biological damage is produced by direct dense ionization independent of oxygen free radicals, yielding an Oxygen Enhancement Ratio (OER) of 1.0.
Sensitization by oxygen takes place if oxygen is present:
💡Correct Answer: Option A (During irradiation.)
Under the oxygen fixation hypothesis, oxygen must be present during the brief irradiation pulse (or within microseconds) to react with radiation-induced transient DNA free radicals (R∙+O2→RO2∙) and fix lethal damage.
The distance to which oxygen can diffuse in tumour cells:
💡Correct Answer: Option C (is approximately 70 micrometers at the venous end of a capillary and less at the arterial end.)
Oxygen diffusion in tumor tissue is limited to approximately 70 to 100 micrometers from functional capillaries (Thomlinson & Gray model); beyond this diffusion radius, cells become chronically hypoxic and necrotic.
Q1747
Radiobiology & Cellular EffectsHypoxic Fraction in Solid Tumors
The fraction of hypoxic cells in human tumors has been estimated to be:
💡Correct Answer: Option B (10-15%)
Radiobiological tumor assays and microelectrode/PET measurements estimate the hypoxic fraction in solid human tumors to typically range between 10% and 15%.
Q1748
Radiobiology & Cellular EffectsRadiation Effects on Embryo and Fetus
The most sensitive stage for the lethal effects of radiation is:
💡Correct Answer: Option A (Preimplantation.)
The preimplantation stage (0 to 9 days post-conception in humans) is the most sensitive period for radiation-induced lethality / embryonic death (the 'all-or-none' phenomenon).
Radiation damage is divided into (a) lethal damage, (b) sublethal damage and (c) potentially lethal damage (PLD). Which of the following statements is true?
💡Correct Answer: Option A (PLD will cause cell death under ordinary circumstances.)
Potentially Lethal Damage (PLD) is component damage that ordinarily causes cell death under standard physiological post-irradiation conditions, but can be repaired if cells are incubated in suboptimal growth conditions (e.g. plateau phase / delayed plating).
💡Correct Answer: Option C (the reason for the increase in cell survival which is observed when a radiation dose is split into two fractions separated by a time interval.)
Sublethal Damage (SLD) repair is the operational mechanism (Elkind repair) responsible for the increase in cell survival observed when a total radiation dose is divided/split into two fractions separated by a time interval of hours.
The increase of cell survival because of sublethal damage repair:
💡Correct Answer: Option B (Is hindered by the increase in radiosensitivity as the cells progress around the cell cycle ("reassortment").)
As time increases between split doses, surviving synchronized cells progress around the cell cycle and enter more sensitive phases (M/G2 - reassortment), which produces a dip in survival that counteracts pure repair.
Q1752
Radiobiology & Cellular EffectsDose-Rate Effect in Radiobiology
The dose-rate effect:
💡Correct Answer: Option C (consists in the reduction of the biologic effect of a given dose when the exposure time is increased.)
The dose-rate effect states that lowering the dose rate (or extending exposure duration) reduces the biological effectiveness of a given dose of low-LET radiation because sublethal damage repair occurs during the prolonged irradiation period.
💡Correct Answer: Option A (the bone-marrow cells.)
Under the Law of Bergonié and Tribondeau, rapidly dividing, undifferentiated hematological stem cells in the bone marrow (erythroblasts, myeloblasts) are the most radiosensitive normal tissue cells in the adult body.
The loss of Intensity on the anode side of the X-ray tube is called:
💡Correct Answer: Option C (Heel Effect)
The Anode Heel Effect describes the reduction in X-ray beam intensity toward the anode end of the field caused by self-absorption of photons within the anode target material itself.
Half lives of two radioactive substances A and B respectively are 20 min. and 40 min. initially, the samples of A and B have an equal number of nuclei. After 80 min. the ratio of the remaining number of A and B nuclei is:
💡Correct Answer: Option C (1:4)
After 80 minutes: - For A (T1/2=20 min): 2080=4 half-lives⟹NA=N0(21)4=16N0 - For B (T1/2=40 min): 4080=2 half-lives⟹NB=N0(21)2=4N0 Ratio NBNA=N0/4N0/16=164=1:4.
Q1757
Radiotherapy Physics & Radiation OncologyDecay Constant Formula
The half-life of radionuclide is 77 days, then its decay constant is:
The half life of radioactive substance is 20 minutes. The time between 20% and 80% decay will be:
💡Correct Answer: Option B (40 minutes)
- At 20% decay, remaining fraction is 80%=0.80N0. - At 80% decay, remaining fraction is 20%=0.20N0. Ratio of remaining amounts =0.200.80=4=22, which corresponds to exactly 2 half-lives. Time=2×20 minutes=40 minutes.
What is the public annual dose limit for the lens of the eye?
💡Correct Answer: Option D (15 mSv/year)
Under ICRP and AERB regulatory guidelines, the equivalent dose limit for the lens of the eye for members of the public is 15 mSv/year (occupational limit is 20 mSv/year).
Q1760
Radiation Safety & Regulatory NormsOccupational Dose Limits for Extremities
What is the occupational dose limit for extremity?
💡Correct Answer: Option D (50rem/year)
The annual occupational equivalent dose limit for the hands, feet, and extremities (and skin) is 50 rem/year (500 mSv/year) under US NRC and ICRP standards.
Q1761
Radiation Safety & Regulatory NormsAnnual Public Effective Dose Limit
What is the annual whole body dose limit for the public?
💡Correct Answer: Option A (1 mSv/year)
The annual effective whole body dose limit for individual members of the general public is 1 mSv/year (0.1 rem/year) under ICRP, NCRP, and AERB regulations.
What is the maximum exposure that AERB allows to occupational workers per year?
💡Correct Answer: Option B (30 mSv)
The Atomic Energy Regulatory Board (AERB, India) mandates an occupational effective dose limit of 20 mSv/year averaged over 5 consecutive years, with a maximum ceiling of 30 mSv in any single year.
What is the maximum exposure that ICRP allows to occupational workers per year?
💡Correct Answer: Option A (50 mSv)
ICRP Publication 103 allows an occupational effective dose limit of 20 mSv/year averaged over defined 5-year periods, subject to a maximum constraint of 50 mSv in any single year.
The activity of radioactive substance decays from 8000 becquerel to 4000 becquerel in 5 days. The activity of the substance after the next 10 days will be:
💡Correct Answer: Option D (1000 becquerel)
Halving from 8000 Bq to 4000 Bq in 5 days indicates T1/2=5 days. In the next 10 days (2×5 days=2 half-lives): A=4000×(21)2=4000×41=1000 becquerel.
Q1765
Radiation Safety & Regulatory NormsOccupational MPD for Radiographers
The maximum permissible dose of radiation to the operator of X-ray machine is:
💡Correct Answer: Option C (5 rem/year)
The maximum permissible whole-body occupational radiation dose for X-ray operators and radiographers is 5 rem/year (50 mSv/year).
The single most effective method of reducing patient somatic exposure when taking radiograph is to use:
💡Correct Answer: Option B (Speed E film)
Using high-speed image receptors (such as Fast E-speed / F-speed film or digital flat-panel detectors) dramatically reduces the required mAs and exposure time, offering the single largest reduction in patient radiation dose.
Which of these factors has no effect on response of cells to irradiation?
💡Correct Answer: Option C (Image receptor used)
Biological cellular response depends on radiation quality (LET), oxygen tension (pO2), and dose-rate. The image receptor (detector/film) captures transmitted photons outside the patient and has zero influence on biological cell damage.
Q1768
Radiotherapy Physics & Radiation OncologyFraction of Disintegrated Radioactivity
What fraction of radioactive material will get disintegrated in a period of two half-lives?
💡Correct Answer: Option D (Three-fourth)
After two half-lives, the remaining fraction is (21)2=41. The fraction disintegrated =1−41=43 (Three-fourth).
Q1769
Medical Ethics & Patient CarePrinciple of Veracity
What is Veracity?
💡Correct Answer: Option D (Duty to tell the truth and avoid deception)
In medical ethics, Veracity is the moral obligation of healthcare professionals to communicate honestly, disclose complete clinical truths, and avoid deception with patients.
Q1770
Medical Ethics & Patient CareGDPR & Healthcare Data Privacy
What is the main concern addressed by GDPR (General Data Protection Regulation) in data privacy.
💡Correct Answer: Option A (Ensuring data privacy)
GDPR (General Data Protection Regulation) establishes comprehensive legal frameworks to ensure personal data privacy, consent, and protection for individuals.
The speed of ultrasound propagation (c=B/ρ) is determined exclusively by the acoustic properties of the propagation medium (bulk modulus elasticity and density), independent of wave frequency or amplitude.
💡Correct Answer: Option B (They are good absorbers of X-rays)
Bone has a high effective atomic number (Z≈13.8) and high physical density (calcium hydroxyapatite), strongly absorbing X-rays via photoelectric effect and leaving the detector unexposed (appearing white/radiopaque).
Q1773
Radiological Physics & Imaging TechnologyAcoustic Coupling Gel & Impedance Matching
With gel between skin and transducer percentage of reflected intensity of ultrasonic is:
💡Correct Answer: Option A (0.03%)
Acoustic coupling gel eliminates the air gap (Zair≪Zskin) and matches the acoustic impedance between transducer and skin, reducing ultrasound reflection to less than 0.03% and transmitting virtually all sound energy.
Q1774
Radiotherapy Physics & Radiation OncologyAttenuation Coefficients & Photon Energy
Attenuation coefficient depends on:
💡Correct Answer: Option C (energy of x-ray photons)
The linear/mass attenuation coefficient (μ) depends fundamentally on the incident X-ray photon energy (E) and the atomic number (Z) and density of the absorber.
Aluminium filters (e.g. 2.5 mm Al equivalent) are placed in the diagnostic X-ray tube port to preferentially absorb low-energy soft X-rays that would otherwise be absorbed by the patient's skin without contributing to image formation.
Q1776
Radiotherapy Physics & Radiation OncologyX-ray Spectrum Wavelength Range
Wavelength of x-rays is in range:
💡Correct Answer: Option A (10^-8 to 10^-13 m)
The electromagnetic spectrum range for X-rays spans wavelengths from approximately 10−8 m (10 nm, soft X-rays) down to 10−13 m (10−4 nm, hard diagnostic/therapeutic X-rays).
Q1777
Radiotherapy Physics & Radiation OncologyExponential Attenuation Law
As the x-rays pass through matter, it's intensity:
💡Correct Answer: Option B (Decreases)
According to the Beer-Lambert exponential attenuation law (I=I0e−μx), as X-rays penetrate matter, photons are absorbed and scattered, causing beam intensity to monotonically decrease.
Q1778
Radiological Physics & Imaging TechnologyAcoustic Impedance Formula
Acoustic impedance is defined as:
💡Correct Answer: Option C (rho * c)
Specific acoustic impedance (Z) is defined as the product of the physical density of the medium (ρ) and the speed of sound propagation in that medium (c): Z=ρ⋅c (measured in Rayls).
Q1779
Radiological Physics & Imaging TechnologyMRI Relaxation Times in Tissues
Fatty tissues have:
💡Correct Answer: Option D (relaxation times of several hundred milliseconds)
In MRI, lipid protons in fatty tissue have a short T1 longitudinal relaxation time of approximately 200 to 300 milliseconds (several hundred milliseconds) due to efficient dipole-dipole molecular tumbling matching Larmor frequency.
Q1780
Radiological Physics & Imaging TechnologyLarmor Precessional Frequency
Angular frequency of precision is called:
💡Correct Answer: Option C (larmor frequency)
In magnetic resonance, the angular precessional frequency of nuclear magnetic moments placed in an external magnetic field (B0) is termed the Larmor Frequency (ω=γB0).
Scattered x-ray beams approach the detector screen:
💡Correct Answer: Option D (At an angle)
Primary unscattered X-ray photons travel straight along lines from the focal spot, whereas Compton-scattered photons deviate and approach the detector obliquely at random angles (attenuated via anti-scatter grids).
Q1782
Radiotherapy Physics & Radiation OncologyDuane-Hunt Law & Maximum Photon Energy
Maximum energy an x-ray photon can have is:
💡Correct Answer: Option C (eV)
According to the Duane-Hunt Law, the maximum kinetic energy transferred to a Bremsstrahlung photon corresponds to the full tube potential: Emax=hνmax=eV (where e is electron charge and V is applied peak tube voltage).
Q1783
Radiological Physics & Imaging TechnologyUltrasound Pulse-Echo Distance Formula
Bone thickness is equal to:
💡Correct Answer: Option A (c * Delta t / 2)
In pulse-echo ultrasound, sound travels to the reflecting bone interface and back (two-way transit time Δt). The one-way anatomical thickness is d=2c⋅Δt.
In a diagnostic radiograph the process mostly responsible for differential attenuation is:
💡Correct Answer: Option C (Photoelectric Interaction)
Photoelectric absorption has a probability proportional to (Z/E)3. Its strong dependence on atomic number (Z3) provides high tissue subject contrast between bone (Z≈13.8), soft tissue (Z≈7.4), and air.
Which of the following is true for low level radioactive waste , such as tubing and swabs contaminated with 99mTc ?
💡Correct Answer: Option D (They can be stored until reaching background levels then disposed of with other medical trash)
Short-lived diagnostic radionuclides like Technetium-99m (T1/2=6 hours) are held in 'decay-in-storage' for 10 half-lives (~60 hours) until activity decays to natural background levels, after which they are disposed of as ordinary medical waste.
Q1786
Radiological Physics & Imaging TechnologyUltrasound Pulse Repetition Frequency (PRF)
In ultrasound a 4 MHz transducer has a useful range of 10cm. What is the maximum pulse repetition frequency of this transducer?
💡Correct Answer: Option A (7.7 KHz)
Speed of sound in soft tissue c=1540 m/s=154,000 cm/s. Round-trip transit distance for depth d=10 cm is 2d=20 cm. Time required per pulse Δt=154,000 cm/s20 cm≈1.2987×10−4 s. Maximum PRF=Δt1=20154000=7700 Hz=7.7 kHz.
The spatial resolution with MRI is about the same as that obtained with:
💡Correct Answer: Option C (CT)
Standard clinical MRI and multidetector Computed Tomography (CT) both achieve high in-plane spatial resolutions on the order of 0.5 to 1.0 mm, vastly superior to PET/SPECT (4-6 mm).
An ultrasound transducer which utilizes a series of elements that transmit sequential sound waves in order to form a rectangular image is called:
💡Correct Answer: Option C (Linear array)
A Linear Sequenced Array transducer fires sequential groups of parallel transducer crystals along a flat bar to produce a wide, rectangular field-of-view image format.
Which detector can be used for small-field data collection required for IMRT field sizes >= 3x3 cm2?
💡Correct Answer: Option D (Diode)
Unshielded silicon stereotactic diode detectors (and micro-chambers) have small active collection volumes (<0.01 cm3), providing high spatial resolution without volume-averaging errors for small IMRT beamlets.
In stereotactic radiosurgery for brain metastasis, prescribing 20 Gy in one fraction to the 60% isodose line means the maximum dose will be _____:
💡Correct Answer: Option C (33 Gy)
If the prescription dose Drx=20 Gy is normalized to the 60% (0.60) isodose line: Maximum Dose Dmax=0.6020 Gy≈33.33 Gy≈33 Gy.
Q1793
Medical Ethics & Patient CareData Ethics & Bias in Healthcare
In data ethics, What is the primary concern related to data bias:
💡Correct Answer: Option D (Data representativeness)
Data bias in clinical models and algorithms arises primarily from poor data representativeness (systematic underrepresentation or skew in training demographic cohorts).
Q1794
Radiobiology & Cellular EffectsLaw of Bergonié and Tribondeau
Which type of tissue is most sensitive to ionising radiation?
💡Correct Answer: Option B (Tissue with cells that divide quickly)
According to the Law of Bergonié and Tribondeau, tissues composed of rapidly proliferating, undifferentiated cells with long mitotic futures (bone marrow, intestinal mucosa, gonadal germ cells) exhibit the highest radiosensitivity.
💡Correct Answer: Option C (As Low As Reasonable Achievable)
ALARA is the cornerstone optimization principle in radiation safety, standing for 'As Low As Reasonably Achievable', taking into account economic and societal factors.
Q1796
Human Anatomy & Clinical PhysiologyAnatomy of the Pharynx and Larynx
Lower part of pharynx is attached to:
💡Correct Answer: Option B (Larynx)
The laryngopharynx (hypopharynx, the inferior part of the pharynx) opens anteriorly directly into the larynx (at the laryngeal inlet) and continues inferiorly as the esophagus at C6.
Q1797
Radiation Safety & Regulatory NormsControlled vs Supervised Radiation Areas
A "Controlled Area" is defined as:
💡Correct Answer: Option D (An area where the exposure of the workers is under the supervision of an RSO)
A Controlled Area is a designated radiological zone where occupational exposure of radiation workers is monitored, restricted, and maintained under the direct supervision of a qualified Radiation Safety Officer (RSO).
Q1798
Radiotherapy Treatment Planning & TechniquesTissue-Maximum Ratio (TMR) Parameters
Tissue-Maximum ratio (TMR) depends on:
💡Correct Answer: Option C (Energy ,depth and field size)
Tissue-Maximum Ratio (TMR) is defined as the ratio of dose at a given depth in phantom to dose at dmax at the same point in space. It depends strictly on Beam Energy, Depth (d), and Field Size (rd), and is completely independent of distance (SAD/SSD).
Q1799
Radiotherapy Treatment Planning & TechniquesTissue-Air Ratio (TAR) Properties
TAR is:
💡Correct Answer: Option D (All of the above)
Tissue-Air Ratio (TAR): 1) At dmax, TAR(dmax,r)=BSF; 2) Is independent of source distance (SAD); 3) Is standardly used in rotational / isocentric treatment time calculations (All of the above).
Q1800
Radiotherapy Physics & Radiation OncologyGamma Ray Constant & Exposure Calculations
The exposure rate at 1m from 100mg of radium is:
💡Correct Answer: Option C (82.5mR/hr)
Specific exposure rate constant for Radium-226 (with 0.5 mm Pt filtration) is Γ=0.825 R⋅m2/(hr⋅g)=825 mR⋅m2/(hr⋅g). For 100 mg=0.1 g of Radium at d=1 m: Exposure Rate=120.1 g×825=82.5 mR/hr.
Iodine-125 seeds are used in brachytherapy for their _____ radiation:
💡Correct Answer: Option C (x-ray and gamma ray)
Iodine-125 decays via electron capture to an excited state of Te-125, emitting a 35.5 keV gamma ray and characteristic 27 to 31 keV X-rays (low-energy X-ray and gamma photons) ideal for prostate permanent seed brachytherapy.
💡Correct Answer: Option B (Is in secular equilibrium)
Radium-226 has a long half-life (T1/2=1600 years) that decays through a series of short-lived daughters (222Rn, T1/2=3.82 days, etc.), establishing Secular Equilibrium after approximately 1 month of encapsulation.
Q1804
Radiotherapy Physics & Radiation OncologyPhotoneutron Production in Medical LINACs
Most of the neutron produced by a high energy linac are produced:
💡Correct Answer: Option A (At the collimator and target area)
In medical linear accelerators operating above 10 MV photon beams, high-energy photons interact with high-Z heavy metal components (Tungsten target, primary collimator, flattening filter, and secondary jaws) via photoneutron (γ,n) reactions.
Q1805
Human Anatomy & Clinical PhysiologyBrain Anatomy (Cerebrum)
What is the largest part of the human brain?
💡Correct Answer: Option C (Cerebrum)
The Cerebrum constitutes approximately 85% of the total weight of the human brain, making it the largest anatomical division.
Q1806
Human Anatomy & Clinical PhysiologyMuscular System Types
Voluntary muscles are contained in the -----------:
💡Correct Answer: Option B (Hind limb)
Skeletal muscles in the limbs (e.g. hind limb / legs) are striated voluntary muscles under conscious somatic nervous control. The heart contains involuntary cardiac muscle, and visceral organs contain smooth muscle.
Q1807
Human Anatomy & Clinical PhysiologyDigestive Hormones (Secretin & CCK)
Which of the following hormones stimulates the production of pancreatic juice and Bicarbonate?
💡Correct Answer: Option B (Cholecystokinin and secretin)
Secretin stimulates the pancreatic ductal cells to secrete an alkaline bicarbonate-rich fluid, and Cholecystokinin (CCK) stimulates pancreatic acinar cells to secrete digestive enzymes.
Q1808
Human Anatomy & Clinical PhysiologyCardiovascular Anatomy & Myocardium
What is a human heart made up of?
💡Correct Answer: Option B (Muscle)
The human heart is primarily a muscular pump composed of specialized, involuntary, striated Cardiac Muscle (Myocardium).
Q1809
Radiotherapy Physics & Radiation OncologyBremsstrahlung Radiation Production
When high energy electrons decelerate in a high Z target, the predominant radiation emitted is?
💡Correct Answer: Option C (Bremsstrahlung)
When relativistic electrons decelerate in the strong nuclear Coulomb fields of heavy target atoms (Tungsten, Z=74), the dominant radiation produced is continuous Bremsstrahlung ('braking radiation').
Q1810
Radiotherapy Physics & Radiation OncologyRadiation Units (Sievert)
A sivert is :
💡Correct Answer: Option B (The SI unit of dose equivalent)
The Sievert (Sv) is the SI unit of radiation Equivalent Dose (H) and Effective Dose (E), defined as 1 Joule of energy absorbed per kilogram of tissue multiplied by radiation weighting factors (1 Sv=1 J/kg=100 rem).
Which of the following is a likely side effect of radiation therapy to the brain?
💡Correct Answer: Option A (Cognitive dysfunction)
Delayed neurotoxicity following cranial radiation therapy frequently manifests as progressive cognitive dysfunction, memory decline, and attention deficits (along with acute alopecia).
Q1812
Radiotherapy Physics & Radiation OncologyRadium Decay Series
226Ra decays to 222Rn by _____ decay
💡Correct Answer: Option B (Alpha)
Radium-226 decays into Radon-222 via Alpha emission: 88226Ra⟶86222Rn+24α.
Q1813
Radiotherapy Physics & Radiation OncologyX-rays vs Gamma Rays Origin
Which of the following is most descriptive of the difference between x-ray and gamma rays?
💡Correct Answer: Option D (Origin)
X-rays and gamma rays of identical energy are physically indistinguishable electromagnetic photons; their sole defining difference is their Origin (Gamma rays originate from atomic nuclei transitions, whereas X-rays originate extranuclearly from electron interactions).
If 1 % of the primary radiation is transmitted through a patient , the midline dose is due to the primary radiation is approximately _____ % of the entrance dose
💡Correct Answer: Option B (10)
Under exponential attenuation (I(x)=I0e−μx), if the exit transmission through full thickness T is 1%=0.01, then at the midline (T/2): Midline Dose=I0e−μ(T/2)=I0e−μT=0.01=0.10=10% of entrance dose.
💡Correct Answer: Option D (The second HVL is greater than the first due to beam hardening)
A diagnostic X-ray beam is polyenergetic. As it traverses the 1st Half-Value Layer (HVL), low-energy soft photons are preferentially filtered out ('beam hardening'), making the transmitted beam higher in average energy. Thus, the 2nd HVL is strictly greater than the 1st HVL (HVL2>HVL1).
For the same exposure to a diagnostic beam , The highest absorbed dose will occur in:
💡Correct Answer: Option D (Bone)
At diagnostic photon energies (30-100 keV), the photoelectric effect dominates (mass energy absorption coefficient μen/ρ∝Z3). Because compact bone has a high effective atomic number (Z≈13.8), bone absorbs up to 4 to 6 times more dose per unit exposure than soft tissue (Z≈7.4).
Two absorbers ,A and B, have atomic number, 4 and 8 respectively. The ration of photoelectric components of their mass attenuation coefficients (A:B) is:
💡Correct Answer: Option C (1:8)
The photoelectric mass attenuation coefficient is proportional to the cube of the atomic number ((τ/ρ)∝Z3). (τ/ρ)B(τ/ρ)A=(ZBZA)3=(84)3=(21)3=81=1:8.
A 5KeV photon undergoing classical scattering would be most likely to lose _____ % of its energy in the process:
💡Correct Answer: Option A (0)
Classical (Coherent / Rayleigh / Thompson) scattering is a completely elastic interaction where the incident photon interacts with bound electrons as a whole, deflecting in angle with exactly 0% energy loss.
Q1819
Radiotherapy Physics & Radiation OncologyPhotoneutron Energy Threshold
The energy threshold for neutron production from photon interaction from matter is _____ MeV
💡Correct Answer: Option D (8)
The nuclear binding energy per nucleon in common high-Z accelerator target and collimator materials (e.g. Lead, Tungsten) dictates that photoneutron production (γ,n) requires a threshold photon energy of approximately 7 to 8 MeV.
Which of the following does not reduce patient dose:
💡Correct Answer: Option C (The use of high ratio grid)
Using a high-ratio anti-scatter grid absorbs significant scatter and primary radiation, requiring the Bucky factor (mAs) to be increased by 3 to 6 times, which increases patient dose (does NOT reduce patient dose).
Radon represents an environmental hazard primarily in:
💡Correct Answer: Option C (Basement and ground floor apartments)
Radon-222 gas (a decay daughter of Uranium/Radium in soil and rock bedrock) is dense and seeps through foundation cracks, concentrating to hazardous levels primarily in basements and unventilated ground-floor rooms.
Q1822
Radiation Safety & Regulatory NormsLinear Non-Threshold (LNT) Model
The currently accepted model of radiation dose vs effect used by regulatory agencies in determining dose standard is:
💡Correct Answer: Option B (Linear without threshold)
Radiation protection regulatory agencies (ICRP, NCRP, AERB) standardly adopt the Linear Non-Threshold (LNT / Linear without threshold) model for stochastic radiation risk assessment (cancer induction and genetic mutations).
The NCRP recommends that radiation monitoring devices shall be used by a personnel who:
💡Correct Answer: Option C (Could be exposed to more than 1/4 of the maximum permissible dose.)
NCRP recommendations require individual personnel monitoring (TLD/film badges) for any radiation worker who has a reasonable potential to receive an occupational dose exceeding 1/4th (25%, or 10% in newer guidelines) of the annual Maximum Permissible Dose (MPD).
In the RTOG grading scale, which grade corresponds to severe erythema and moist desquamation caused by radiation therapy?
💡Correct Answer: Option C (Grade 3)
Under the RTOG Acute Radiation Morbidity Scoring Criteria for skin: - Grade 1: Faint/dull erythema, dry desquamation - Grade 2: Moderate to brisk erythema, patchy moist desquamation - Grade 3: Confluent, severe moist desquamation, pitting edema - Grade 4: Ulceration, hemorrhage, necrosis.
Q1825
Radiological Physics & Imaging TechnologykVp Effect on Radiographic Contrast
A Diagnostic tube running at 80kVp and 10mAs. The setting are changed to 120kVp and 5mAs What happens to image contrast:
💡Correct Answer: Option C (Contrast decreases)
Increasing tube potential from 80 kVp to 120 kVp shifts the photon spectrum to higher energies where Compton scattering increases and photoelectric absorption (Z3/E3) drops, producing a longer grayscale and causing radiographic image contrast to decrease.
An element contain electrons in the 10, 65, 70 and 72 KeV energy levels . Which energy cannot occur in its characteristics x-ray spectrum?
💡Correct Answer: Option B (7)
Characteristic X-ray energies equal transition differences between discrete shells: - 72−70=2 keV - 70−65=5 keV - 72−65=7 keV - 65−10=55 keV - 70−10=60 keV - 72−10=62 keV. All listed photon values correspond to valid energy transition differences in the atom.
Q1827
Radiotherapy Treatment Planning & TechniquesLinear Accelerator Treatment Head Structure
The primary collimator in a linear accelerator is located before the:
💡Correct Answer: Option B (Flattening Filter)
In a medical linear accelerator treatment head, the components in beam direction are: Electron Gun → Accelerator Tube → Bending Magnet → X-ray Target → Primary Collimator → Flattening Filter / Scattering Foil → Ion Chamber → Secondary Jaws. Thus, the primary collimator is located before the Flattening Filter.
Q1828
Radiotherapy Treatment Planning & TechniquesSterling's Equivalent Square Field Formula
What is the equivalent square of a 5×20 cm2 rectangular field?
💡Correct Answer: Option B (8.0)
According to Sterling's formula for equivalent square field (Seq): Seq=Perimeter4×Area=2(a+b)4×(a×b)=a+b2×a×b For a=5 cm and b=20 cm: Seq=5+202×5×20=25200=8.0 cm.
About General Science (Physics, Chemistry, Biology) Questions for JKSSB & JKPSC
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