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.
Q2
Organic & StereochemistryCrime 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).
Q3
Organic & StereochemistryForensic 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).
Q4
Organic & StereochemistryForensic 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.
Q5
Organic & StereochemistryForensic 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.
Q6
Organic & StereochemistryForensic 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.
Q7
Organic & StereochemistryForensic 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.
Q8
Organic & StereochemistryForensic 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.
Q9
Organic & StereochemistryCrime 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.
Q10
Organic & StereochemistryCrime 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.
Q11
Organic & StereochemistryCrime 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.
Q12
Organic & StereochemistryCrime 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.
Q13
Organic & StereochemistryCrime 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.
Q14
Organic & StereochemistryForensic 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.
Q15
Organic & StereochemistryArson 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.
Q16
Organic & StereochemistryCrime 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.
Q17
Organic & StereochemistryCrime 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.
Q18
Organic & StereochemistryLegal Terms
Conduct money is paid for
💡Correct Answer: Option C (Compensation for appearing as expert)
Conduct money is the traveling expense and allowance paid to a witness, including a medical or forensic expert, to summon them to appear and testify in court.
Q19
Organic & StereochemistryImpression 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.
Q20
Organic & StereochemistryAlternate 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.
Q21
Organic & StereochemistryCrime 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.
Q22
Organic & StereochemistryMicroscopy
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.
Q23
Organic & StereochemistryCrime 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.
Q24
Organic & StereochemistryStatistics
The simplest measurement of central tendency is
💡Correct Answer: Option A (Mean)
The arithmetic mean (average) is considered the simplest and most commonly used measure of central tendency.
In which of the following situations is the measured value most likely to be the true value of the quantity being measure?
💡Correct Answer: Option C (When the measurement has both high precision and high accuracy)
High accuracy ensures the measured value is close to the true value, while high precision ensures consistency, making a high accuracy and high precision measurement the closest to the true value.
The error caused by poor calibration of the instrument is called
💡Correct Answer: Option B (Systematic Error)
Systematic errors are reproducible inaccuracies that are consistently in the same direction, often caused by poorly calibrated instruments or flawed experimental design.
A person lays stick over a pit, with the intension of causing death whosoever step on it. What offence has he committed?
💡Correct Answer: Option B (Culpable homicide)
This is a classic illustration from Section 299 of the Indian Penal Code (IPC) for Culpable Homicide. Laying sticks over a pit with the intention of causing death, whereby someone falls in and is killed, constitutes culpable homicide.
Q29
Inorganic Chemistry & Coordination CompoundsLaw 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).
Q30
Inorganic Chemistry & Coordination CompoundsLaw 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.
Which is not the amendment done to the IPC, 1860 Section 375?
💡Correct Answer: Option D (Rape of boys below the age of 16 years will carry minimum imprisonment of ten years or life imprisonment.)
Section 375 of the IPC deals exclusively with sexual assault committed by a man against a female. Male children are protected under the POCSO Act, not Section 375 IPC.
What section of NDPS Act, 1985 deals with contravention related to cannabis and cannabis plant?
💡Correct Answer: Option B (Section-20)
Section 20 of the Narcotic Drugs and Psychotropic Substances (NDPS) Act, 1985 prescribes the punishment for contravention in relation to cannabis plant and cannabis (charas, ganja).
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.
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.
💡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).
Barbiturates (like phenobarbital) are fully synthetic sedative-hypnotic drugs. Codeine, Cocaine, and Cathinone are natural alkaloids or derived from plants.
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).
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.
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.
"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).
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.
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.
Q49
Physical Chemistry & SpectroscopyExplosives
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).
Q50
Physical Chemistry & SpectroscopyLegal Acts
Explosive, their definition, composition and punishment is described in
💡Correct Answer: Option B (The Explosive Substance Act, 1908)
The Explosive Substances Act, 1908 of India defines explosive substances, deals with punishments for causing explosions, and possessing explosives under suspicious circumstances.
Q51
Physical Chemistry & SpectroscopyCrime 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.
Q52
Physical Chemistry & SpectroscopyChemical 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.
Q53
Physical Chemistry & SpectroscopyChemical 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.
Q54
Physical Chemistry & SpectroscopyChemical 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.
Q55
Physical Chemistry & SpectroscopySpectroscopy
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).
Q56
Physical Chemistry & SpectroscopyToxicology
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).
Q57
Physical Chemistry & SpectroscopyToxicology
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.
Q58
Physical Chemistry & SpectroscopyChemical 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.
Q59
Physical Chemistry & SpectroscopyChromatography
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.
💡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).
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.
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.
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.
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.
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.
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.
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.
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.
Q75
Forensic Toxicology & PharmacologyAmino 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.
Q76
Forensic Toxicology & PharmacologyLipid 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.
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.
Q78
Forensic Toxicology & PharmacologyToxicology
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.
Q79
Forensic Toxicology & PharmacologyCell 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.
Q80
Forensic Toxicology & PharmacologyAntidotes
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.
Q81
Forensic Toxicology & PharmacologyAntidotes
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).
Q82
Forensic Toxicology & PharmacologyChemical 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.
Q83
Forensic Toxicology & PharmacologyFood 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.
Q84
Forensic Toxicology & PharmacologyAntidotes
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.
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.
Q86
Forensic Toxicology & PharmacologyToxicology
______ 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).
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).
Q89
Forensic Toxicology & PharmacologyAntidotes
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.
Q90
Forensic Toxicology & PharmacologyToxicology
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).
Q91
Forensic Toxicology & PharmacologyToxicology
Inebriant Poison includes
💡Correct Answer: Option B (Ethanol)
Inebriants are intoxicants that cause drunkenness. Ethanol (alcohol) is the classic example of an inebriant poison.
Q92
Forensic Toxicology & PharmacologyToxicology
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.
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.
Q94
Forensic Toxicology & PharmacologyToxicology
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.
Q95
Forensic Toxicology & PharmacologyToxicology 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.
Q96
Forensic Toxicology & PharmacologyToxicology 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.
Q97
General Knowledge & Analytical 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.
Q98
General Knowledge & Analytical 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.
Q99
General Knowledge & Analytical 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.
Q100
General Knowledge & Analytical 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.
Q101
General Knowledge & Analytical 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.
Q102
General Knowledge & Analytical 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.
Q103
General Knowledge & Analytical ChemistryLasers
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.
Q104
General Knowledge & Analytical ChemistryPhotochemistry
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.
Q105
General Knowledge & Analytical 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).
Q106
General Knowledge & Analytical 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.
Q107
General Knowledge & Analytical 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.
Q108
General Knowledge & Analytical 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.
Q109
General Knowledge & Analytical 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.
Q110
General Knowledge & Analytical 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.
Q111
General Knowledge & Analytical ChemistryChromatography
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.
Q112
General Knowledge & Analytical ChemistryChromatography
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.
Q113
General Knowledge & Analytical ChemistryChromatography
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.
Q114
General Knowledge & Analytical ChemistryChromatography
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.
Q115
General Knowledge & Analytical ChemistryChromatography
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).
Q116
General Knowledge & Analytical ChemistryChromatography
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.
Q117
General Knowledge & Analytical ChemistryChromatography
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.
Q118
General Knowledge & Analytical 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.
Q119
General Knowledge & Analytical 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.
Q120
General Knowledge & Analytical 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).
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About JKSSB Assistant Scientific Officer (Chemistry & Toxicology) 2024 Previous Year Paper
This page provides the full solved question paper for the JKSSB Assistant Scientific Officer (Chemistry & Toxicology) examination conducted in 2024 by the Home Department (Forensic Science Laboratory). Every MCQ is presented with verified answer keys and detailed bilingual explanations to support concept building.
Key subjects covered in this paper include Organic & Stereochemistry, Inorganic Chemistry & Coordination Compounds, Physical Chemistry & Spectroscopy, Forensic Toxicology & Pharmacology, General Knowledge & Analytical Chemistry. Practicing authentic previous year questions is the proven way to master question patterns and improve accuracy for upcoming exams across Jammu & Kashmir.
