JKSSB Lab Assistant (Forest/Ecology & Environment) 2025 Solved Question Paper

Question 1

Two numbers are in the ratio 4:5. If their HCF is 17, find the larger number.

Accepted Answer

Option A: 85. Let the two numbers be $4x$ and $5x$. The highest common factor (HCF) of $4x$ and $5x$ is $x$. Given $x = 17$, the two numbers are $4 	imes 17 = 68$ and $5 	imes 17 = 85$. The larger number is 85.

Question 2

Find the least number which is divisible by 9, 15, and 21.

Accepted Answer

Option A: 315. The least number divisible by 9, 15, and 21 is their Least Common Multiple (LCM). Prime factorizations: $9 = 3^2$, $15 = 3 	imes 5$, $21 = 3 	imes 7$. $	ext{LCM} = 3^2 	imes 5 	imes 7 = 9 	imes 35 = 315$.

Question 3

The HCF of 3021 and 3233 is

Accepted Answer

Option C: 53. Using the Euclidean algorithm or difference method: Difference $= 3233 - 3021 = 212$. The factors of 212 are $1, 2, 4, 53, 106, 212$. Testing the prime factor 53: $3021 = 53 	imes 57$ and $3233 = 53 	imes 61$. Since 57 and 61 are coprime, the HCF is 53.

Question 4

Find the LCM of 2^4 x 3^4 x 7^2, 3^3 x 5^3, 2^5 x 7^3.

Accepted Answer

Option C: 2^5 x 3^4 x 5^3 x 7^3. The LCM of numbers expressed in prime factorizations is the product of the highest power of each prime factor present: Highest power of 2 is $2^5$; highest power of 3 is $3^4$; highest power of 5 is $5^3$; highest power of 7 is $7^3$. Therefore, $	ext{LCM} = 2^5 	imes 3^4 	imes 5^3 	imes 7^3$.

Question 5

The average of first 5 multiples of 5 is

Accepted Answer

Option C: 15. The first 5 multiples of 5 are 5, 10, 15, 20, and 25. For an arithmetic sequence, the average is the middle term or $\frac{	ext{First} + 	ext{Last}}{2} = \frac{5 + 25}{2} = 15$.

Question 6

The average age of boys in a class is 10 years and the average age of girls is 12 years. What is the average age of that class if the number of boys and girls is in a ratio of 3:1?

Accepted Answer

Option A: 10.5. Weighted average age $= \frac{n_b \bar{x}_b + n_g \bar{x}_g}{n_b + n_g} = \frac{3(10) + 1(12)}{3 + 1} = \frac{30 + 12}{4} = \frac{42}{4} = 10.5	ext{ years}$.

Question 7

The average mark of the first 20 students is 80, and for the next 10 students is 50. What is the average of the entire class?

Accepted Answer

Option A: 70. Total marks $= (20 	imes 80) + (10 	imes 50) = 1600 + 500 = 2100$. Total number of students $= 20 + 10 = 30$. Average of entire class $= \frac{2100}{30} = 70$.

Question 8

If 4 men can do a work in 10 days and 3 women can do that same work in 20 days. How many days will they take if they do the work together?

Accepted Answer

Option B: 6.67. Total work $= 4	ext{ men} 	imes 10	ext{ days} = 40	ext{ man-days} = 3	ext{ women} 	imes 20	ext{ days} = 60	ext{ woman-days}$. Thus, $40 M = 60 W \implies 2 M = 3 W$, so $1 M = 1.5 W$. Together, 4 men and 3 women $= 4(1.5 W) + 3 W = 6 W + 3 W = 9	ext{ women}$. Time taken $= \frac{60	ext{ woman-days}}{9	ext{ women}} = \frac{20}{3} \approx 6.67	ext{ days}$.

Question 9

A car can go from point A to point B in 4 hours if he is travelling at 50 kmph. How fast must he go to reach the same destination in 2.5 hours?

Accepted Answer

Option A: 80 kmph. Distance between A and B $= 	ext{Speed} 	imes 	ext{Time} = 50	ext{ km/h} 	imes 4	ext{ hours} = 200	ext{ km}$. Required speed for 2.5 hours $= \frac{200	ext{ km}}{2.5	ext{ hours}} = 80	ext{ km/h}$.

Question 10

A farmer travelled a distance of 48 km in 7 hours. He travelled partly on foot at 4 km/hr and partly on bicycle @ 9 km/hr. The distance travelled on foot is _____ (in km).

Accepted Answer

Option C: 12. Let the time spent on foot be $t$ hours. Then time on bicycle is $(7 - t)$ hours. Total distance $= 4t + 9(7 - t) = 48 \implies 4t + 63 - 9t = 48 \implies 5t = 15 \implies t = 3	ext{ hours}$. Distance travelled on foot $= 4	ext{ km/h} 	imes 3	ext{ hours} = 12	ext{ km}$.

Question 11

Valve A can fill a tank in 2 hours while valve B can empty the tank in 10 hours. How much time will it take to fill the tank if both valves are open?

Accepted Answer

Option A: 2.5 hours. Net rate of filling per hour $= \frac{1}{2} - \frac{1}{10} = \frac{5 - 1}{10} = \frac{4}{10} = \frac{2}{5}$ tank per hour. Total time required to fill the tank $= \frac{5}{2} = 2.5	ext{ hours}$.

Question 12

A batsman scored 100 runs which included 8 boundaries and 3 sixes. What percent of his total score did he make by running between the wickets?

Accepted Answer

Option A: 50. Runs from boundaries and sixes $= (8 	imes 4) + (3 	imes 6) = 32 + 18 = 50	ext{ runs}$. Runs scored by running between the wickets $= 100 - 50 = 50	ext{ runs}$. Percentage $= \frac{50}{100} 	imes 100\% = 50\%$.

Question 13

If 25% of a is b, then b% of 25 is same as _______.

Accepted Answer

Option C: 25/4% of a. Given $b = 25\% 	ext{ of } a = \frac{25}{100}a = \frac{a}{4}$. Then $b\% 	ext{ of } 25 = \frac{b}{100} 	imes 25 = \frac{a/4}{100} 	imes 25 = \frac{25}{4\% 	ext{ of } a} = \frac{25/4}{100} a = \frac{25}{4}\% 	ext{ of } a$ (or 6.25% of $a$).

Question 14

If 50% of 15% of x is 9, then x is _______

Accepted Answer

Option C: 120. $\frac{50}{100} 	imes \frac{15}{100} 	imes x = 9 \implies 0.50 	imes 0.15 	imes x = 9 \implies 0.075 x = 9 \implies x = \frac{9}{0.075} = 120$.

Question 15

A rectangular garden measures 30 meters by 20 meters. A pathway of 2 meters width surrounds the garden. What is the perimeter of the outer boundary of the pathway?

Accepted Answer

Option B: 116 m. Outer length $= 30 + 2(2) = 34	ext{ m}$. Outer width $= 20 + 2(2) = 24	ext{ m}$. Outer perimeter $= 2 	imes (	ext{Length} + 	ext{Width}) = 2 	imes (34 + 24) = 2 	imes 58 = 116	ext{ m}$.

Question 16

A cuboidal box has a length of 12 cm, width of 8 cm, and height of 6 cm. If the box has no lid, what is its surface area?

Accepted Answer

Option B: 336 cm^2. An open box has 1 bottom face and 4 vertical sides: Surface Area $= (l 	imes w) + 2(l 	imes h + w 	imes h) = (12 	imes 8) + 2(12 	imes 6 + 8 	imes 6) = 96 + 2(72 + 48) = 96 + 2(120) = 96 + 240 = 336	ext{ cm}^2$.

Question 17

A box contains 5 black marbles and 7 white marbles. Two marbles are drawn at random without replacement. What is the probability that both are black?

Accepted Answer

Option A: 10/66. Total marbles $= 5 + 7 = 12$. Probability of first black $= \frac{5}{12}$. Probability of second black $= \frac{4}{11}$. Probability that both are black $= \frac{5}{12} 	imes \frac{4}{11} = \frac{20}{132} = \frac{10}{66}$.

Question 18

A coin is tossed three times. What is the probability of getting at least two heads?

Accepted Answer

Option A: 1/2. Total possible outcomes $= 2^3 = 8$. Favorable outcomes with at least two heads (2 heads or 3 heads) are: {HHT, HTH, THH, HHH} (4 outcomes). Probability $= \frac{4}{8} = \frac{1}{2}$.

Question 19

A person is currently four times as old as his daughter, and after 15 years, the sum of their ages will be 100. What is the present age of the daughter?

Accepted Answer

Option A: 14 years. Let the daughter's present age be $x$. The father's age is $4x$. After 15 years, their ages will be $(x + 15)$ and $(4x + 15)$. Given: $(x + 15) + (4x + 15) = 100 \implies 5x + 30 = 100 \implies 5x = 70 \implies x = 14	ext{ years}$.

Question 20

A sum of money is divided among A, B, and C in the ratio 3:4:5. If C's share is Rs.300 more than B's, what is the total sum?

Accepted Answer

Option B: Rs. 3,600. Let shares be $3x, 4x, 5x$. Difference between C and B is $5x - 4x = x = 300$. Total sum $= (3 + 4 + 5)x = 12x = 12 	imes 300 = 	ext{Rs. } 3,600$.

Question 21

A person is facing east. They turn 90° clockwise, then 180° clockwise, and then 90° anti-clockwise. In which direction is the person facing now?

Accepted Answer

Option C: West. Net angular displacement $= +90^\circ 	ext{ (CW)} + 180^\circ 	ext{ (CW)} - 90^\circ 	ext{ (ACW)} = +180^\circ$. Turning $180^\circ$ from East faces directly opposite, which is West.

Question 22

Raj walks 10 meters north, then 10 meters east, then 10 meters south, and then 10 meters west. After completing this square, he walks 5 meters north and 5 meters west. How far is Raj from his starting point?

Accepted Answer

Option D: sqrt(50) m. After walking 10m North, 10m East, 10m South, and 10m West, Raj returns to his initial starting coordinate $(0,0)$. From there, he moves 5m North ($y = +5$) and 5m West ($x = -5$). His distance from the origin is $d = \sqrt{(-5)^2 + 5^2} = \sqrt{25 + 25} = \sqrt{50}	ext{ m}$.

Question 23

There are 500 students in a class. 80 of them take French and 200 take Spanish. Some students take both languages. There are 300 students who take no language whatsoever. How many students take at least one language?

Accepted Answer

Option A: 200. The number of students taking at least one language is the union of French and Spanish students: $n(F \cup S) = 	ext{Total students} - n(	ext{neither}) = 500 - 300 = 200$.

Question 24

In a certain code, "LEARNING" is written as "MFRPJXJH". How is "TEACHING" written in that code?

Accepted Answer

Option C: UFRBDXJH. Letter-by-letter transformation pattern:
$T(+1) = U$, $E(+1) = F$, $A 	o R$, $C(+1) = D$, $H 	o X$, $I(+1) = J$, $N 	o H$, $G(+1) = H$.
This yields UFRBDXJH.

Question 25

Given a Series below. Find what number would come in place of the question mark(?).
2, 5, 12.5, 31.25, ?, 195.3125, 488.28125

Accepted Answer

Option A: 78.125. Each term in the series is multiplied by $2.5$ (or $5/2$):
$2 	imes 2.5 = 5$
$5 	imes 2.5 = 12.5$
$12.5 	imes 2.5 = 31.25$
$31.25 	imes 2.5 = 78.125$
$78.125 	imes 2.5 = 195.3125$. The missing number is 78.125.

Question 26

Finish the series, by filling in the question mark(?):
4, 9, 25, 49, 121, 169, ?

Accepted Answer

Option B: 289. The series consists of the squares of consecutive prime numbers: $2^2 = 4$, $3^2 = 9$, $5^2 = 25$, $7^2 = 49$, $11^2 = 121$, $13^2 = 169$. The next prime number is 17, and $17^2 = 289$.

Question 27

Fill the question mark (?) with an appropriate number to complete the series.
4, 18, ?, 100, 180, 294, 448

Accepted Answer

Option B: 48. Pattern is $n 	imes (n+1)^2$ for $n = 1, 2, 3, \dots$:
$1 	imes 2^2 = 4$
$2 	imes 3^2 = 18$
$3 	imes 4^2 = 3 	imes 16 = 48$
$4 	imes 5^2 = 100$
$5 	imes 6^2 = 180$
$6 	imes 7^2 = 294$
$7 	imes 8^2 = 448$. The missing number is 48.

Question 28

Given series: 13, 24, 46, 90, 178, ?.
Fill the question mark (?) with an appropriate number to complete the series.

Accepted Answer

Option B: 354. Pattern is $(	ext{Previous term} 	imes 2) - 2$:
$13 	imes 2 - 2 = 24$
$24 	imes 2 - 2 = 46$
$46 	imes 2 - 2 = 90$
$90 	imes 2 - 2 = 178$
$178 	imes 2 - 2 = 356 - 2 = 354$.

Question 29

Choose the option among 1-4 to replace the (d) to make a logical sequence.
Question Figure: (a) triangle/circle/square/L, (b) circle/L/triangle/square, (c) L/square/circle/triangle, (d) ?

Accepted Answer

Option B: 2. The elements shift position in a clockwise cyclic rotation from frame to frame. Continuing the clockwise cycle leads to Answer Figure 2.

Question 30

Choose the option among 1-4 to replace the (c) to make a logical sequence in line elements.

Accepted Answer

Option D: 4. The series systematically alternates and adds vertical and horizontal line segments in sequence, progressing to 2 vertical lines with 2 horizontal bars in Figure 4.

Question 31

Identify the odd one out:
I) Zoology
II) Nephrology
III) Gastroenterology
IV) Urology
Choose the Correct Option:

Accepted Answer

Option A: I. Nephrology (kidneys), Gastroenterology (digestive tract), and Urology (urinary system) are specialized branches of human medicine. Zoology is the broad biological science of animal biology. Thus, Zoology (I) is the odd one out.

Question 32

Pointing towards a girl, Neha says, "This girl is the sister of my only brother's daughter." What is the relation of Neha to that girl?

Accepted Answer

Option C: Niece. Neha's only brother's daughter is Neha's niece. The sister of her brother's daughter is also her brother's daughter, which makes the girl Neha's Niece.

Question 33

Consider the analogy, Monk : Ascetic. Of the following choices, which one is more close to the given analogy?

Accepted Answer

Option C: Athlete : Disciplined. A monk is defined by the intrinsic characteristic of being ascetic (austere and dedicated); similarly, an athlete is intrinsically characterized by being disciplined.

Question 34

Choose the correct option to fill in the blank:
_____ Mount Everest is the highest mountain in the world

Accepted Answer

Option D: No Article. In standard English grammar, names of individual mountain peaks (e.g., Mount Everest, Mount Kilimanjaro, Mont Blanc) do not take the definite article 'the', unlike mountain ranges (e.g., the Himalayas, the Alps).

Question 35

Select one of the following options, the sentence of which is written with incorrect article usage.

Accepted Answer

Option B: I met an European tourist yesterday.. The word 'European' begins with a consonant glide sound /j/ ('yoo-roh-pee-an'). Therefore, it takes the indefinite article 'a', NOT 'an' ('a European tourist'). Sentence B contains incorrect article usage.

Question 36

What percent is 30 grams of 1kg?

Accepted Answer

Option A: 3%. $1	ext{ kg} = 1000	ext{ grams}$. Percentage $= \frac{30	ext{ g}}{1000	ext{ g}} 	imes 100\% = 3\%$.

Question 37

Choose the best synonym for Innocuous

Accepted Answer

Option C: Harmless. Innocuous means not harmful or offensive; innocuous is synonymous with harmless, safe, or benign.

Question 38

If the 6 digit number is 521*64, then which smallest number from the options given, will be in the place of '*' such that the 6 digit number is completely divisible by 3?

Accepted Answer

Option C: 3. A number is divisible by 3 if the sum of its digits is a multiple of 3. Sum of known digits $= 5 + 2 + 1 + 6 + 4 = 18$. The total sum is $18 + *$. For this to be divisible by 3, $*$ can be 0, 3, 6, 9. From the given options {1, 2, 3, 6}, the smallest valid number is 3.

Question 39

Find the number from the given options that can be added to 8278, to make it a perfect square

Accepted Answer

Option D: 3. Evaluate nearby integer squares: $90^2 = 8100$, $91^2 = 8281$. To reach the nearest next perfect square (8281): $8281 - 8278 = 3$. Adding 3 makes it a perfect square ($91^2$).

Question 40

In a certain code 'MISSIONS' is written as 'MSIISNOS'. How is 'PASSIONS' written in that code?

Accepted Answer

Option B: PSAISNOS. Coding pattern keeps the first and last letters fixed and swaps adjacent pairs of inner letters:
$M - (IS) - (SI) - (ON) - S 	o M - S - I - I - S - N - O - S$.
Applying to PASSIONS: Keep P and S fixed; swap AS $	o$ SA, SI $	o$ IS, ON $	o$ NO: $P - SA - IS - NO - S = 	ext{PSAISNOS}$.

Question 41

In a certain code, "COMPUTER" is written as "DPONVUGP". How will "TECHNOLOGY" be coded?

Accepted Answer

Option C: UFEFOPNMHZ. The letter shifts follow the periodic positional shift rule yielding UFEFOPNMHZ.

Question 42

In a 45 litre mixture, milk and water is in a ratio of 2:1. If the ratio of milk and water is to be made as 1:2, then find the amount of water (in litres) that has to be added to the mixture.

Accepted Answer

Option B: 45. Initial mixture $= 45	ext{ litres}$ in ratio 2:1 $\implies$ Milk $= 30	ext{ L}$, Water $= 15	ext{ L}$. Let $w$ litres of water be added: $\frac{30}{15 + w} = \frac{1}{2} \implies 15 + w = 60 \implies w = 45	ext{ litres}$.

Question 43

In a certain code, "LONDON" is written as "MPQGPO". How is "NEWYORK" written in that code?

Accepted Answer

Option B: OFZBPSN. Applying positional letter shifts: $N(+1)=O$, $E(+1)=F$, $W(+3)=Z$, $Y(+3)=B$, $O(+1)=P$, $R(+1)=S$, $K(+3)=N$. The resulting code is OFZBPSN.

Question 44

A Cylindrical tank has a volume of 924 cu.m, and its base diameter is 7m. Find the depth of the tank

Accepted Answer

Option C: 24 m. Radius $r = \frac{7}{2} = 3.5	ext{ m}$. Volume of cylinder $V = \pi r^2 h = \frac{22}{7} 	imes \left(\frac{7}{2}ight)^2 	imes h = \frac{77}{2} h = 38.5 h$. Given $V = 924	ext{ m}^3 \implies 38.5 h = 924 \implies h = \frac{924}{38.5} = 24	ext{ m}$.

Question 45

Pick the odd number from the series given,
385, 462, 572, 427, 671, 264

Accepted Answer

Option D: 427. All numbers except 427 are divisible by 11:
$385 = 11 	imes 35$
$462 = 11 	imes 42$
$572 = 11 	imes 52$
$671 = 11 	imes 61$
$264 = 11 	imes 24$
For 427, alternating digit sum is $(4 + 7) - 2 = 9 
e 0$, so 427 is not divisible by 11.

Question 46

Which of the following is the odd one out based on the coding pattern?
I) HOUSE -> IPVTF
II) MONEY -> NPFZF
III) RIVER -> SJWFS
IV) TREND -> USFOE
Choose the Correct option:

Accepted Answer

Option B: MONEY -> NPFZF. In HOUSE, RIVER, and TREND, each letter is shifted forward by +1 uniformly. In MONEY, M(+1)=N, O(+1)=P, but N(+1) should be O (coded as F), so MONEY -> NPFZF violates the +1 pattern.

Question 47

Complete the pattern by choosing the appropriate 'x':
28, 56, 168, x, 5880, 64680

Accepted Answer

Option B: 840. The multiplication factor increases through consecutive prime numbers (2, 3, 5, 7, 11):
$28 	imes 2 = 56$
$56 	imes 3 = 168$
$168 	imes 5 = 840$
$840 	imes 7 = 5880$
$5880 	imes 11 = 64680$. Thus, $x = 840$.

Question 48

There are 500 students in a class. 80 of them take French and 200 take Spanish. Some students take both languages. There are 300 students who take no language whatsoever. How many students take at least one language?

Accepted Answer

Option D: 200. Students taking at least one language $= 	ext{Total students} - 	ext{Students taking neither} = 500 - 300 = 200$.

Question 49

In a class of 60 students, 35 students like Mathematics, 25 students like Science, 15 students like both Mathematics and Science
Question:
I) How many students like only Mathematics?
II) How many students like only Science?
III) How many students like at least one of the two subjects?
IV) How many students like neither subject?
Choose the Correct Option :

Accepted Answer

Option D: 20,10,45,15. Calculations:
I) Only Mathematics $= 35 - 15 = 20$.
II) Only Science $= 25 - 15 = 10$.
III) At least one subject $= 20 + 10 + 15 = 45$.
IV) Neither subject $= 60 - 45 = 15$.
Matching sequence: 20, 10, 45, 15. Choice D.

Question 50

Read the statements given and the conclusions and choose the appropriate option:
Statement: In a Syed Mushtaq Ali Trophy Match, the total runs made by a team in an innings was 220. Out of these, 125 runs were scored by right-arm off spinners.
Conclusions:
i) 75% of the team consists of right-arm off spinners
ii) The opening batters were right-arm off spinners.
Consider the statements to be true and choose an option deciding how the conclusion(s) can logically be provided.

Accepted Answer

Option D: Neither Conclusion i) nor ii) follows. The premise provides information only on the run tally scored by off-spinners. It gives no demographic breakdown of the total team composition (Conclusion i) nor any information regarding the batting order of players (Conclusion ii). Neither conclusion follows.

Question 51

Choose the best synonym of Surreptitious from the following options.

Accepted Answer

Option C: Secretive. Surreptitious means kept secret, stealthy, or clandestine, especially because it would not be approved of. Synonym is Secretive.

Question 52

Choose the best antonym of Recalcitrant from the below given four options.

Accepted Answer

Option D: Compliant. Recalcitrant means obstinately disobedient and resisting authority. Antonym is Compliant (willing to obey rules or acquiesce).

Question 53

Find the word that is the antonym of the underlined word:
His living style and conduct showed him opulent

Accepted Answer

Option D: Poor. Opulent means ostentatiously rich, lavish, and wealthy. Its direct antonym is Poor (or impoverished).

Question 54

Fill in the blank with the correct preposition
He was accused _____ plagiarism after submitting his thesis.

Accepted Answer

Option B: of. The adjective/verb 'accuse' takes the fixed preposition 'of' ('accused of a crime/misconduct').

Question 55

Fill in the blank with the correct preposition
You are running so fast that I cannot catch _____ with you.

Accepted Answer

Option B: up. The phrasal verb 'catch up with' means to reach the same level, speed, or quality as someone ahead.

Question 56

Fill in the blanks with the correct pair of prepositions from the given choices.
He waved at his parents _____ the platform as the train was pulling _____ the station.

Accepted Answer

Option C: on, out of. Idiomatic spatial prepositions: standing 'on the platform', and a train 'pulling out of the station'.

Question 57

The Doctor _____ the operation tomorrow.

Accepted Answer

Option C: will perform. The temporal adverb 'tomorrow' indicates a future action, requiring the simple future tense 'will perform'.

Question 58

What is the primary focus of the passage on the Great Barrier Reef?

Accepted Answer

Option C: Threats to the Great Barrier Reef and potential solutions. The passage outlines the severe threat of coral bleaching driven by warming seas and discusses potential innovative solutions (coral farming, genetic engineering) requiring international cooperation.

Question 59

What does the passage suggest about the solutions for coral bleaching?

Accepted Answer

Option C: They rely heavily on international cooperation.. The passage explicitly states that innovative restoration solutions 'are costly and require international collaboration to be effective.'

Question 60

Based on the passage, what is a major challenge to implementing the solutions?

Accepted Answer

Option A: High costs and the need for collaboration.. The text directly notes that 'these interventions are costly and require international collaboration to be effective', identifying financial expense and multinational coordination as major hurdles.

Question 61

Caterpillars cannot defend themselves because they ________

Accepted Answer

Option A: have no claws or jaws. The passage states: 'Despite having no means to actively defend themselves with weapons like claws or jaws, they have, nevertheless, evolved other equally effective deterrents.'

Question 62

Experienced birds do not attack the Himalayan caterpillars because they are ________

Accepted Answer

Option D: unpalatable.. The text notes that an inexperienced bird that eats a caterpillar will vomit it out and subsequently desist from attacking, because the prominent colours warn predators of their inedibility (unpalatability).

Question 63

In the context of this passage, a martyr is one who dies ________

Accepted Answer

Option C: without any gain to oneself.. The passage states: 'this would do the unfortunate victim no good, the species benefits. A rare example of a martyr among animals', indicating the individual dies without personal gain.

Question 64

Seats for Mathematics, Chemistry and History in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of the increased seats?

Accepted Answer

Option B: 2:3:4. Increased seats:
- Mathematics: $5 	imes 1.40 = 7$
- Chemistry: $7 	imes 1.50 = 10.5$
- History: $8 	imes 1.75 = 14$
New ratio $= 7 : 10.5 : 14$. Multiplying by 2: $14 : 21 : 28$. Dividing by 7: $2 : 3 : 4$.

Lab Assistant (Forest/Ecology & Environment)2025

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JKSSB — Lab Assistant (Forest/Ecology & Environment) (2025)

Two numbers are in the ratio 4:5. If their HCF is 17, find the larger number.

Find the least number which is divisible by 9, 15, and 21.

The HCF of 3021 and 3233 is

Find the LCM of 2^4 x 3^4 x 7^2, 3^3 x 5^3, 2^5 x 7^3.

The average of first 5 multiples of 5 is

The average age of boys in a class is 10 years and the average age of girls is 12 years. What is the average age of that class if the number of boys and girls is in a ratio of 3:1?

The average mark of the first 20 students is 80, and for the next 10 students is 50. What is the average of the entire class?

If 4 men can do a work in 10 days and 3 women can do that same work in 20 days. How many days will they take if they do the work together?

A car can go from point A to point B in 4 hours if he is travelling at 50 kmph. How fast must he go to reach the same destination in 2.5 hours?

A farmer travelled a distance of 48 km in 7 hours. He travelled partly on foot at 4 km/hr and partly on bicycle @ 9 km/hr. The distance travelled on foot is _____ (in km).

Valve A can fill a tank in 2 hours while valve B can empty the tank in 10 hours. How much time will it take to fill the tank if both valves are open?

A batsman scored 100 runs which included 8 boundaries and 3 sixes. What percent of his total score did he make by running between the wickets?

If 25% of a is b, then b% of 25 is same as _______.

If 50% of 15% of x is 9, then x is _______

A rectangular garden measures 30 meters by 20 meters. A pathway of 2 meters width surrounds the garden. What is the perimeter of the outer boundary of the pathway?

A cuboidal box has a length of 12 cm, width of 8 cm, and height of 6 cm. If the box has no lid, what is its surface area?

A box contains 5 black marbles and 7 white marbles. Two marbles are drawn at random without replacement. What is the probability that both are black?

A coin is tossed three times. What is the probability of getting at least two heads?

A person is currently four times as old as his daughter, and after 15 years, the sum of their ages will be 100. What is the present age of the daughter?

A sum of money is divided among A, B, and C in the ratio 3:4:5. If C's share is Rs.300 more than B's, what is the total sum?

A person is facing east. They turn 90° clockwise, then 180° clockwise, and then 90° anti-clockwise. In which direction is the person facing now?

Raj walks 10 meters north, then 10 meters east, then 10 meters south, and then 10 meters west. After completing this square, he walks 5 meters north and 5 meters west. How far is Raj from his starting point?

There are 500 students in a class. 80 of them take French and 200 take Spanish. Some students take both languages. There are 300 students who take no language whatsoever. How many students take at least one language?

In a certain code, "LEARNING" is written as "MFRPJXJH". How is "TEACHING" written in that code?

Given a Series below. Find what number would come in place of the question mark(?).2, 5, 12.5, 31.25, ?, 195.3125, 488.28125

Finish the series, by filling in the question mark(?):4, 9, 25, 49, 121, 169, ?

Fill the question mark (?) with an appropriate number to complete the series.4, 18, ?, 100, 180, 294, 448

Given series: 13, 24, 46, 90, 178, ?.Fill the question mark (?) with an appropriate number to complete the series.

Choose the option among 1-4 to replace the (d) to make a logical sequence.Question Figure: (a) triangle/circle/square/L, (b) circle/L/triangle/square, (c) L/square/circle/triangle, (d) ?

Choose the option among 1-4 to replace the (c) to make a logical sequence in line elements.

Identify the odd one out:I) ZoologyII) NephrologyIII) GastroenterologyIV) UrologyChoose the Correct Option:

Pointing towards a girl, Neha says, "This girl is the sister of my only brother's daughter." What is the relation of Neha to that girl?

Consider the analogy, Monk : Ascetic. Of the following choices, which one is more close to the given analogy?

Choose the correct option to fill in the blank:_____ Mount Everest is the highest mountain in the world

Select one of the following options, the sentence of which is written with incorrect article usage.

What percent is 30 grams of 1kg?

Choose the best synonym for Innocuous

If the 6 digit number is 52164, then which smallest number from the options given, will be in the place of '' such that the 6 digit number is completely divisible by 3?

Find the number from the given options that can be added to 8278, to make it a perfect square

In a certain code 'MISSIONS' is written as 'MSIISNOS'. How is 'PASSIONS' written in that code?

In a certain code, "COMPUTER" is written as "DPONVUGP". How will "TECHNOLOGY" be coded?

In a 45 litre mixture, milk and water is in a ratio of 2:1. If the ratio of milk and water is to be made as 1:2, then find the amount of water (in litres) that has to be added to the mixture.

In a certain code, "LONDON" is written as "MPQGPO". How is "NEWYORK" written in that code?

A Cylindrical tank has a volume of 924 cu.m, and its base diameter is 7m. Find the depth of the tank

Pick the odd number from the series given,385, 462, 572, 427, 671, 264

Which of the following is the odd one out based on the coding pattern?I) HOUSE -> IPVTFII) MONEY -> NPFZFIII) RIVER -> SJWFSIV) TREND -> USFOEChoose the Correct option:

Complete the pattern by choosing the appropriate 'x':28, 56, 168, x, 5880, 64680

There are 500 students in a class. 80 of them take French and 200 take Spanish. Some students take both languages. There are 300 students who take no language whatsoever. How many students take at least one language?

Choose the best synonym of Surreptitious from the following options.

Choose the best antonym of Recalcitrant from the below given four options.

Find the word that is the antonym of the underlined word:His living style and conduct showed him opulent

Fill in the blank with the correct prepositionHe was accused _____ plagiarism after submitting his thesis.

Fill in the blank with the correct prepositionYou are running so fast that I cannot catch _____ with you.

Fill in the blanks with the correct pair of prepositions from the given choices.He waved at his parents _____ the platform as the train was pulling _____ the station.

The Doctor _____ the operation tomorrow.

What is the primary focus of the passage on the Great Barrier Reef?

What does the passage suggest about the solutions for coral bleaching?

Based on the passage, what is a major challenge to implementing the solutions?

Caterpillars cannot defend themselves because they ________

Experienced birds do not attack the Himalayan caterpillars because they are ________

In the context of this passage, a martyr is one who dies ________

Seats for Mathematics, Chemistry and History in a school are in the ratio 5 : 7 : 8. There is a proposal to increase these seats by 40%, 50% and 75% respectively. What will be the ratio of the increased seats?

The salaries of three employees, Virat, Rohit, Rahul are in the ratio 2 : 3 : 5. If the increments of 15%, 10% and 20% are allowed respectively in their salaries, then what will be the new ratio of their salaries?

The present ages of Usman and Travis are in the ratio of 5:4 respectively. Three years hence, the ratio of their ages will become 11 : 9 respectively. What is Travis's present age in years?

The sum of the present ages of a mother and her daughter is 60 years. Six years ago, mother's age was five times the age of the daughter. After 6 years, daughter's age will be

A box contains 6 blue and 8 red marbles. One marble is drawn at random from the box. What is the probability that the marble drawn is red?

Suppose a quadrilateral having a diagonal of length 10 cm, which divides the quadrilateral into two right triangles and the heights of triangles with diagonals as the base, are 4 cm and 6 cm. Find the area of the quadrilateral.

Two train tickets from Town P to Q and three tickets from Town P to R cost Rs. 77 but three train tickets from Town P to Q and two tickets from Town P to R cost Rs. 73. What are the fares for Towns Q and R from P?

Rachin put his timepiece on the table in such a way that at 6 P.M., the hour hand points to the North. In which direction the minute hand will point at 9.15 P.M.?

Choose the word which best expresses the meaning of the given word: AUGUST

One morning, Umran and Abul were talking to each other face to face at a crossing. If Abul's shadow was exactly to the left of Umran, which direction was Umran facing?

Select a figure from amongst the Answer Figures (1-5) which will continue the same series as established by the five Question Figures

Read the below paragraph and answer the question:In the past, consumers would rarely walk into an ice cream store and order low-fat ice cream... This paragraph best supports the statement that,

Select the most appropriate option to fill in the blanks to maintain the sequence.DEF, DEF_2, DE_2F_2, _____, D_2E_2F_3

Pointing to a photograph. Bajpai said, "He is the son of the only daughter of the father of my brother." How Bajpai is related to the man in the photograph?

Ayesha's father was 38 years of age when she was born while her mother was 36 years old when her brother four years younger to her was born. What is the difference between the ages of her parents?

Her relatives threw cold water on her dream of becoming an actress.Identify the right meaning of the underlined idiom.

Given a Series below. Find what number would come in place of the question mark(?).
2, 5, 12.5, 31.25, ?, 195.3125, 488.28125

Finish the series, by filling in the question mark(?):
4, 9, 25, 49, 121, 169, ?

Fill the question mark (?) with an appropriate number to complete the series.
4, 18, ?, 100, 180, 294, 448

Given series: 13, 24, 46, 90, 178, ?.
Fill the question mark (?) with an appropriate number to complete the series.

Choose the option among 1-4 to replace the (d) to make a logical sequence.
Question Figure: (a) triangle/circle/square/L, (b) circle/L/triangle/square, (c) L/square/circle/triangle, (d) ?

Identify the odd one out:
I) Zoology
II) Nephrology
III) Gastroenterology
IV) Urology
Choose the Correct Option:

Choose the correct option to fill in the blank:
_____ Mount Everest is the highest mountain in the world

Pick the odd number from the series given,
385, 462, 572, 427, 671, 264

Which of the following is the odd one out based on the coding pattern?
I) HOUSE -> IPVTF
II) MONEY -> NPFZF
III) RIVER -> SJWFS
IV) TREND -> USFOE
Choose the Correct option:

Complete the pattern by choosing the appropriate 'x':
28, 56, 168, x, 5880, 64680

Find the word that is the antonym of the underlined word:
His living style and conduct showed him opulent

Fill in the blank with the correct preposition
He was accused _____ plagiarism after submitting his thesis.

Fill in the blank with the correct preposition
You are running so fast that I cannot catch _____ with you.

Fill in the blanks with the correct pair of prepositions from the given choices.
He waved at his parents _ the platform as the train was pulling _ the station.

Read the below paragraph and answer the question:
In the past, consumers would rarely walk into an ice cream store and order low-fat ice cream... This paragraph best supports the statement that,

Select the most appropriate option to fill in the blanks to maintain the sequence.
DEF, DEF_2, DE_2F_2, _____, D_2E_2F_3

Her relatives threw cold water on her dream of becoming an actress.
Identify the right meaning of the underlined idiom.

From the following idioms, select the most suitable one to complete the sentence,
Let's settle the bill for the damage _________.