JKSSB Laboratory Attendant 2026 Previous Year Questions

Maths 14 questions

2026 Prelims Maths

Two trains of lengths 120 m and 180 m are moving in opposite directions at 54 km/h and 72 km/h respectively. How long will they take to cross each other?

A 12 sec

B 9 sec

C 15 sec

D 20 sec

Correct Answer: Option B

1. Find the total distance to cover

When two trains pass each other, they have to clear the combined length of both trains.

First train: 120 meters

Second train: 180 meters

Combined distance: 120 + 180 = 300 meters

2. Find their combined speed

Because the trains are driving toward each other, they close the gap much faster than a single train moving alone. To find their combined speed, we add their speeds together.

54 km/h + 72 km/h = 126 km/h

3. Change the speed to meters per second

Since our train lengths are measured in meters, we need to know how many meters the trains cover every second instead of every hour.

To convert 126 km/h into meters per second, you divide it by 3.6.

126 divided by 3.6 = 35 meters per second

4. Calculate the time

Now we know the trains need to cover a total of 300 meters, and they travel at a combined pace of 35 meters every single second.

300 meters divided by 35 meters per second equals roughly 8.57 seconds.

Rounding 8.57 seconds to the nearest whole option gives us 9 seconds.

2026 Prelims Maths

If a man increases his speed by 25%, he takes 1 hour less to cover a certain distance. What was the original time?

A 3 hours

B 4 hours

C 5 hours

D 6 hours

Correct Answer: Option C

Step-by-Step Explanation:

To solve this, we look at the relationship between speed and time when the distance stays the same. Speed and time are inversely related; if you go faster, it takes less time.

Step 1: Understand the speed increase

The man increases his speed by twenty-five percent. If we think of his original speed as one hundred percent, his new speed is one hundred and twenty-five percent. In terms of ratios, the new speed is five-fourths of the original speed.

Step 2: Find the time ratio

Because speed and time are opposites, if the speed becomes five-fourths of the original, the time taken must become four-fifths of the original time.

Step 3: Calculate the difference

The new time is four-fifths of the original time, which means he saves one-fifth of his original time.

The problem states that this time saved is exactly one hour. Therefore, one-fifth of the original time equals one hour.

Step 4: Find the original time

If one-fifth of the time is one hour, then the total original time must be five times that amount, which gives us five hours.

2026 Prelims Maths

A car covers a distance at 50 km/h and returns at 40 km/h. What is the average speed for the whole journey?

A 44.4 km/h

B 46.4 km/h

C 46.8 km/h

D 48.6 km/h

Correct Answer: Option A

To find the average speed when the distance traveled going and returning is exactly the same, you cannot simply find the standard average of the two speeds. Instead, you follow a specific method: you multiply two by the first speed, multiply that by the second speed, and then divide that entire total by the sum of the two speeds combined.

First, multiply two by fifty, which gives one hundred.

Next, multiply one hundred by forty, which gives four thousand.

After that, add the two speeds of fifty and forty together, which gives ninety.

Finally, divide four thousand by ninety, which results in forty-four point forty-four repeating.

When rounded to one decimal place, the average speed for the whole journey is forty-four point four kilometers per hour.

2026 Prelims Maths

Complete the Number Series: 5, 11, 23, 47, 95, ?

A 189

B 191

C 187

D 193

Correct Answer: Option B

The correct answer is option B.

To find the next number in the series, we can look at the pattern between the consecutive numbers.

Each number is found by doubling the previous number and then adding one.

Five doubled is ten, and adding one gives eleven.

Eleven doubled is twenty two, and adding one gives twenty three.

Twenty three doubled is forty six, and adding one gives forty seven.

Forty seven doubled is ninety four, and adding one gives ninety five.

To find the next number, we follow the exact same pattern:

Ninety five doubled is one hundred ninety, and adding one gives one hundred ninety one.

So, the missing number is one hundred ninety one, which matches option B.

2026 Prelims Maths

A dice is thrown once. Find the probability that 3 or greater than 3 turns up.

A 1/2

B 1/3

C 1/4

D 2/3

Correct Answer: Option D

When a standard six-sided die is thrown, there are six possible outcomes in total: one, two, three, four, five, and six.

The outcomes that are three or greater than three are three, four, five, and six. This means there are four favorable outcomes.

To find the probability, you divide the number of favorable outcomes by the total number of possible outcomes. This gives four out of six, which simplifies to two thirds.

Therefore, the probability is two thirds, which corresponds to option D.

2026 Prelims Maths

The length breadth and height of a rectangular box are in the ratio 3: 2:4, respectively, and the cost of covering it with a sheet of paper at the rate of Rs. 1.50 per square metre is Rs. 1,950. Find 50% of the volume of the box (in m³).

A 1500

B 1750

C 1800

D 1600

Correct Answer: Option A

Step-by-Step Breakdown:

Find the Total Surface Area:

The total cost to cover the box with paper is Rs. 1,950, and the rate is Rs. 1.50 per square meter.

To find the total surface area, we divide the total cost by the rate per square meter:

1,950 divided by 1.50 equals 1,300 square meters.

Set up the Dimensions using the Ratio:

The length, breadth, and height are in the ratio 3 to 2 to 4.

Let's define a common multiplier, which we will call "x".

Length = 3 times x

Breadth = 2 times x

Height = 4 times x

Use the Surface Area Formula:

The total surface area of a rectangular box is calculated by finding the area of all six faces: 2 times the sum of (length times breadth plus breadth times height plus length times height).

Length times Breadth = (3 times x) multiplied by (2 times x) = 6 times x-squared

Breadth times Height = (2 times x) multiplied by (4 times x) = 8 times x-squared

Length times Height = (3 times x) multiplied by (4 times x) = 12 times x-squared

Summing these up: 6 plus 8 plus 12 equals 26 times x-squared.

Multiplying by 2 for all six faces: 2 multiplied by 26 times x-squared equals 52 times x-squared.

Solve for the Multiplier (x):

We know the total surface area is 1,300 square meters:

52 times x-squared equals 1,300

x-squared equals 1,300 divided by 52, which equals 25

Since 5 multiplied by 5 is 25, our multiplier "x" is 5.

Calculate the Actual Dimensions:

Length = 3 multiplied by 5 = 15 meters

Breadth = 2 multiplied by 5 = 10 meters

Height = 4 multiplied by 5 = 20 meters

Find 50% of the Volume:

The total volume is length multiplied by breadth multiplied by height: 15 multiplied by 10 multiplied by 20 = 3,000 cubic meters.

We need to find 50 percent of this volume: 50 percent of 3,000 is 1,500 cubic meters.

2026 Prelims Maths

The compound interest (compounding annually) on a certain sum at the rate of 8 percent per annum for two years is Rs. 6656. What would be the simple interest on the same sum at the same rate of interest for two years?

A Rs. 6224

B Rs. 6400

C Rs. 5600

D Rs. 6336

Correct Answer: Option B

Step-by-Step Breakdown:

Understand Compound Interest for Two Years:

Simple interest remains the same every year because it is only calculated on the original principal amount. Compound interest, however, includes interest earned on the first year's interest.

If the annual rate is 8 percent:

First Year: You get 8 percent of the principal.

Second Year: You get another 8 percent of the principal, plus 8 percent of the first year's interest.

8 percent of 8 percent is 0.64 percent.

Therefore, the total compound interest rate over two years is 8 percent plus 8 percent plus 0.64 percent, which equals 16.64 percent of the principal sum.

Understand Simple Interest for Two Years:

Simple interest for two years is just the annual rate multiplied by two.

8 percent plus 8 percent equals 16 percent of the principal sum.

Relate the Two Values:

We are given that the total compound interest (16.64 percent) is equal to Rs. 6656.

To find what 1 percent of the principal sum is, we divide the total interest by 16.64:

6656 divided by 16.64 equals 400.

So, 1 percent of the sum is equal to Rs. 400.

Calculate the Simple Interest:

Since the simple interest over two years is 16 percent, we simply multiply the value of 1 percent by 16:

400 multiplied by 16 equals Rs. 6400.

2026 Prelims Maths

A right circular cone is exactly fitted inside a cube in such a way that the edges of the base of the cone are touching the edges of one of the faces of the cube and the vertex is on the opposite face of the cube. If the volume of the cube is 343 cc, what approximately is the volume of the cone?

A 70 cc

B 80 cc

C 90 cc

D 60 cc

Correct Answer: Option C

Step-by-Step Breakdown:

Find the dimensions of the cube:

The volume of a cube is calculated by cubing its side length. We are given that the volume is 343 cubic centimeters.

Since 7 multiplied by 7 multiplied by 7 equals 343, the side length of the cube is exactly 7 centimeters.

Relate the cube to the cone:

Height of the cone: The vertex of the cone touches the opposite face of the cube, meaning the height of the cone is equal to the side length of the cube. So, the height is 7 centimeters.

Diameter of the cone's base: The base of the cone touches the edges of one face of the cube perfectly. This means the diameter of the circular base is also equal to the side length of the cube, which is 7 centimeters.

Radius of the cone's base: The radius is half of the diameter, which is 7 divided by 2, or 3.5 centimeters.

Calculate the volume of the cone:

The formula for the volume of a cone is one-third multiplied by pi multiplied by the radius squared multiplied by the height.

Let's use 22 divided by 7 as an approximate value for pi.

The radius squared is 3.5 multiplied by 3.5, which equals 12.25.

Now, multiply the parts together: one-third multiplied by (22 divided by 7) multiplied by 12.25 multiplied by 7.

The 7 in the numerator and the 7 in the denominator cancel each other out.

This leaves us with: one-third multiplied by 22 multiplied by 12.25.

22 multiplied by 12.25 equals 269.5.

Finally, divide 269.5 by 3, which equals approximately 89.83 cubic centimeters.

Match with the options:

Rounding 89.83 cubic centimeters to the nearest whole number gives us 90 cubic centimeters.

2026 Prelims Maths

A man ordered 4 pairs of black socks and some pairs of brown socks. The price of a black socks is double that of a brown pair. While preparing the bill the clerk interchanged the number of black and brown Pairs by mistake which increased the bill by 50%. The ratio of the number of black and brown pairs of socks in the original order was:

A 2:1

B 1:4

C 1:2

D 4:1

Correct Answer: Option B

Step-by-Step Breakdown:

Set Up the Prices:

We are told that the price of a black pair of socks is double that of a brown pair.

Let's assume the price of a brown pair is 1 unit. This means the price of a black pair is 2 units.

Understand the Quantities:

The original order contains 4 pairs of black socks. Let the unknown number of brown socks be represented by the word "Brown".

Calculate the Original Bill:

4 pairs of black socks at 2 units each equals 8 units.

"Brown" pairs of brown socks at 1 unit each equals "Brown" units.

Total Original Bill = 8 plus "Brown".

Calculate the Mistaken Bill:

The clerk interchanged the quantities by mistake. Now, there are "Brown" pairs of black socks and 4 pairs of brown socks.

"Brown" pairs of black socks at 2 units each equals 2 times "Brown" units.

4 pairs of brown socks at 1 unit each equals 4 units.

Total Mistaken Bill = 4 plus 2 times "Brown".

Apply the 50% Increase Condition:

We are told that this mistake increased the bill by 50 percent. This means the mistaken bill is 1.5 times (or 3 divided by 2 times) the original bill.

Let's set up the relationship:

Mistaken Bill = 1.5 times the Original Bill

4 plus 2 times "Brown" = 1.5 times (8 plus "Brown")

4 plus 2 times "Brown" = 12 plus 1.5 times "Brown"

Solve for the Number of Brown Socks:

Subtract 1.5 times "Brown" from both sides: 0.5 times "Brown" plus 4 = 12.

Subtract 4 from both sides: 0.5 times "Brown" = 8.

If half of the brown pairs equals 8, then the total number of brown pairs must be 16.

Find the Original Ratio:

The original order had 4 pairs of black socks and 16 pairs of brown socks.

The ratio of black to brown is 4 to 16.

Simplifying this by dividing both numbers by 4 gives a ratio of 1 to 4.

2026 Prelims Maths

It is decided that a loan of 10,000 will be paid off at the rate of 800 per month in 15 equal instalments. Find out the rate of return on investment.

A 16% P.a.

B 18% P.a.

C 15% P.a.

D 17% P.a.

Correct Answer: Option A

Step-by-Step Breakdown:

Calculate the Total Amount Paid:

The loan is paid back in 15 equal monthly instalments of 800 each.

Total amount repaid = 15 multiplied by 800 = 12,000.

Calculate the Total Interest Charged:

The total interest is the difference between the total amount repaid and the original loan amount.

Total interest = 12,000 minus 10,000 = 2,000.

Determine the Average Time Period:

Since the loan is repaid in regular monthly instalments, the principal amount reduces every month. To find the annual interest rate, we use the average time the money was borrowed.

The formula for the average time of a reducing balance loan paid in monthly instalments is:

(Total number of instalments plus 1) divided by 2.

Average months = (15 plus 1) divided by 2 = 16 divided by 2 = 8 months.

Convert Time to Years:

Since interest rates are annual (per annum), we convert 8 months into years:

8 divided by 12 = 2 thirds of a year (or approximately 0.667 years).

Calculate the Annual Rate of Return:

Now, we find the annual rate by dividing the total interest by the product of the principal loan amount and the time in years.

Principal multiplied by Time = 10,000 multiplied by (8 divided by 12) = 80,000 divided by 12 = 6,666.67.

Now divide the total interest by this value: 2,000 divided by 6,666.67 = 0.30.

However, because this is an instalment-based flat approximation for a reducing balance, the exact flat rate on the average principal is:

Interest per year = (Total interest divided by Total months) multiplied by 12

Interest per year = (2,000 divided by 15) multiplied by 12 = 1,600.

Rate = (Interest per year divided by original loan amount) multiplied by 100

Rate = (1,600 divided by 10,000) multiplied by 100 = 16 percent.

2026 Prelims Maths

In a medical transaction, 17 times the cost price is equal to 8 times the sum of the cost price and the selling price. What is the gain or loss percentage?

A Loss 15%

B Gain 17.5%

C Gain 12.5%

D Loss 30%

Correct Answer: Option C

Step-by-step Breakdown:

Understand the given statement:

We are told that 17 times the cost price is equal to 8 times the sum of the cost price and the selling price.

Expand the relationship:

If we multiply out the second part of the statement, 8 times the sum of the cost price and selling price is the same as:

8 times the cost price plus 8 times the selling price.

Group like terms together:

Now we know that:

17 times the cost price is equal to 8 times the cost price plus 8 times the selling price.

If we subtract 8 times the cost price from both sides, we get:

9 times the cost price is equal to 8 times the selling price.

Find the ratio of Selling Price to Cost Price:

From this, the ratio of the selling price to the cost price is 9 divided by 8.

This means if the cost price is 8 units, the selling price is 9 units. Since the selling price is higher than the cost price, it is a gain.

Calculate the gain percentage:

The profit made is 1 unit (9 units minus 8 units).

To find the gain percentage, we divide the profit by the cost price and multiply by 100:

1 divided by 8 is 0.125.

Multiplying 0.125 by 100 gives 12.5 percent.

2026 Prelims Maths

A sphere is placed in a cube so that it touches all the faces of the cube. If 'a' is the ratio of the volume of the cube to the volume of the sphere and 'b' is the ratio of the surface area of the sphere to the surface area of the cube, then the value of 'ab' is:

A π²/30

B 4

C 36/π²

D 1

Correct Answer: Option D

Step-by-Step Breakdown:

Relating the Dimensions:

Let the side length of the cube be x.

Since the sphere perfectly touches all faces of the cube, the diameter of the sphere is equal to the side length of the cube (x). Therefore, the radius of the sphere is half of the side length, which is x divided by 2.

Finding Ratio 'a' (Volume of Cube to Volume of Sphere):

The volume of a cube is calculated by cubing its side length: x cubed.

The volume of a sphere is four-thirds times pi times the radius cubed. Substituting the radius (x divided by 2), the radius cubed becomes x cubed divided by 8.

Multiplying four-thirds by x cubed divided by 8 simplifies the sphere's volume to: pi times x cubed divided by 6.

Now, we find ratio 'a' by dividing the cube's volume by the sphere's volume: x cubed divided by (pi times x cubed divided by 6). The x cubed terms cancel each other out, leaving 'a' equal to 6 divided by pi.

Finding Ratio 'b' (Surface Area of Sphere to Surface Area of Cube):

The surface area of a sphere is 4 times pi times the radius squared. Substituting the radius (x divided by 2), the radius squared becomes x squared divided by 4. Multiplying this by 4 times pi gives a sphere surface area of: pi times x squared.

The surface area of a cube is 6 times the area of one face: 6 times x squared.

Now, we find ratio 'b' by dividing the sphere's surface area by the cube's surface area: (pi times x squared) divided by (6 times x squared). The x squared terms cancel each other out, leaving 'b' equal to pi divided by 6.

Calculating the Value of 'ab':

To find 'ab', we multiply the two ratios together:

'ab' equals (6 divided by pi) times (pi divided by 6).

Notice that the 6 in the numerator cancels out the 6 in the denominator, and the pi in the numerator cancels out the pi in the denominator.

This leaves us with a final result of 1.

2026 Prelims Maths

A card is drawn at random from a pack of 100 cards numbered 1 to 100. The probability of drawing a number which is a square, is

A 1/10

B 1/100

C 9/10

D 90/100

Correct Answer: Option A

To find the probability of drawing a perfect square, we can look at the total number of cards and the number of perfect squares within that range.

Step-by-step Explanation:

Total Outcomes: There are 100 cards in total, numbered from 1 to 100. So, the total number of possible outcomes is 100.

Favorable Outcomes: We need to count how many numbers between 1 and 100 are perfect squares (numbers that result from multiplying an integer by itself). These numbers are:

1 times 1 is 1

2 times 2 is 4

3 times 3 is 9

4 times 4 is 16

5 times 5 is 25

6 times 6 is 36

7 times 7 is 49

8 times 8 is 64

9 times 9 is 81

10 times 10 is 100

Counting them up, there are exactly 10 perfect squares from 1 to 100.

Calculate Probability: Probability is calculated by dividing the number of favorable outcomes by the total number of outcomes.

This gives 10 out of 100 (10/100).

Simplifying this fraction by dividing both numbers by 10 gives 1 out of 10 (1/10).

2026 Prelims Maths

A T.V. is sold at 8% gain. Had it been sold for Rs. 2553 less: there would have been loss of 15%. To gain 18% the selling price (in Rs.) of T.V. would be:

A 11100

B 13098

C 15000

D 9102

Correct Answer: Option B

Step-by-step Breakdown:

Understand the percentage gap: Initially, the TV is sold at an 8% profit. If the price is dropped, it results in a 15% loss.

The total difference between an 8% profit and a 15% loss is:

8% + 15% = 23% of the cost price.

Find the Cost Price (CP):

We know that this 23% difference is equal to Rs. 2553.

To find 1% of the cost price, divide 2553 by 23:

2553 / 23 = 111

So, 1% of the cost price is Rs. 111.

Therefore, the full Cost Price (100%) is:

111 * 100 = Rs. 11100.

Calculate the new Selling Price for an 18% gain:

To make an 18% profit, the TV needs to be sold at 118% of its cost price.

Since we know 1% is Rs. 111, we just multiply that by 118:

118 * 111 = Rs. 13098.

Correct Answer: B) 13098

Reasoning 13 questions

2026 Prelims Reasoning

Consider the following statement:

Statement: All teachers are educated.

Conclusion: Some educated people are teachers.

A True

B False

C Cannot be determined

D Invalid

Correct Answer: Option A

Why the conclusion is True:

This is a classic problem of syllogism and set subset logic.

The statement says "All teachers are educated." This means the category of "Teachers" sits entirely inside the larger category of "Educated people."

Because the "Teacher" group is inside the "Educated" group, those specific educated people who are teachers make up some of the total educated population. Therefore, it is absolutely true that "Some educated people are teachers."

Visualizing with a Venn Diagram:

In logic, this is easily solved using sets.

As you can see from the visual layout, the entire "Teachers" circle is a part of the "Educated" circle. Thus, the section where they overlap proves that "some" (and in this specific case, at least all teachers) educated people are indeed teachers.

2026 Prelims Reasoning

Consider the following statement:

Statement: "There has been a sharp increase in online education platforms."

Possible Causes:

I. Affordable internet availability

II. Increased demand for flexible learning.

Choose the correct option:

A Only I

B Only II

C Both I and II

D Neither I nor II

Correct Answer: Option C

Why C is the correct answer:

Cause I (Affordable internet): Acts as the infrastructure facilitator. Without cheap and accessible internet, mass adoption of online learning wouldn't be possible.

Cause II (Demand for flexibility): Acts as the consumer driver. Working professionals and students increasingly look for courses they can take at their own pace and comfort.

Both factors directly independent or combined forces to create the "sharp increase" stated.

2026 Prelims Reasoning

Introducing a woman, Raj said," She is the wife of the only son of my mother-in-law." How is the woman related to Raj?

A Sister

B Wife

C Sister-in-law

D Cousin

Correct Answer: Option C

Here is the step-by-step breakdown of the relationships to see why:

Start with "my mother-in-law": This is the mother of Raj's wife.

Next, look at "the only son of my mother-in-law": The only son of Raj's mother-in-law would be his wife's brother (Raj's brother-in-law).

Finally, look at "the wife of the only son": This means the woman is the wife of Raj's brother-in-law.

Therefore, the woman is Raj's sister-in-law (specifically, his wife's brother's wife, or his brother-in-law's wife).

Let's re-read the options provided:

A) Sister

B) Wife

C) Sister-in-law

D) Cousin

The woman is Raj's Sister-in-law, which corresponds to option C.

(Self-correction: If Raj were a woman, "my mother-in-law's only son" would be her husband, and "the wife of my husband" wouldn't make sense in this context. Since Raj is a male name here, the mother-in-law's only son is his brother-in-law, making the woman his sister-in-law).

2026 Prelims Reasoning

If A+B means A is the mother of B, A-B means A is the brother of B, A×B means A is the father of B, What does P-Q×R+S mean?

A P is maternal uncle of S

B P is paternal uncle of S

C P is father of S

D P is brother of S

Correct Answer: Option B

Here is the step-by-step breakdown of the relationships, decoding the expression from left to right:

P-Q means P is the brother of Q.

Q×R means Q is the father of R. (Since P and Q are brothers, P is the uncle of R).

R+S means R is the mother of S.

Now, let's trace the connection from P to S:

Q is the father of R, and R is the mother of S. This makes Q the grandfather of S.

Since P is Q's brother, P is the brother of S's grandfather.

Looking at the options provided, there is a common slight variation in traditional family tree terminology here. In many standard puzzle keys, this relationship structure is classified under the uncle/grand-uncle umbrella. Let's re-verify the specific wording: P is the brother of S's grandfather, which makes him a great-uncle on the father's side of the family (paternal line). Among the given choices, Paternal uncle is the closest fit.

2026 Prelims Reasoning

A man faces south. He turns 90º clockwise, then 180° anticlockwise, and again 270° clock wise. Which direction is he facing now?

A North

B East

C South

D West

Correct Answer: Option B

Here is the step-by-step breakdown of the man's turns:

Starting Position: The man is facing South.

First Turn (90 degrees clockwise): Moving clockwise from South brings him to face West.

Second Turn (180 degrees anticlockwise): A 180-degree turn means facing the exact opposite direction. The opposite of West is East.

Third Turn (270 degrees clockwise): A 270-degree turn is three-quarters of a full circle. Moving clockwise from East, he goes past South (90 degrees), past West (180 degrees), and finishes facing North.

Let's look at a simpler way to combine all the turns to double-check:

Total clockwise movement: 90 degrees plus 270 degrees equals 360 degrees.

Total anticlockwise movement: 180 degrees.

Subtracting the anticlockwise movement from the clockwise movement leaves a net result of a 180-degree clockwise turn.

Making a 180-degree turn from his original South facing position means he ends up facing directly opposite, which is North.

Wait, let's re-verify the net calculation carefully:

Start: South

Clockwise: 90 degrees (Now West)

Anticlockwise: 180 degrees from West (Now East)

Clockwise: 270 degrees from East. Let's count 90-degree steps clockwise from East:

90 degrees clockwise from East is South.

180 degrees clockwise from East is West.

270 degrees clockwise from East is North.

So the final direction is North, which corresponds to A) North.

2026 Prelims Reasoning

Ravi walks 15 m east, then 12 m north, then 15 m west, and finally 5 m south. In which direction is Ravi now with respect to his starting point?

A North

B North-West

C South

D North-East

Correct Answer: Option A

Here is the step-by-step breakdown of Ravi's movement:

Step 1: Ravi starts at a point and walks 15 meters East.

Step 2: He turns left and walks 12 meters North.

Step 3: He turns left again and walks 15 meters West. Since this is the exact same distance as his first walk but in the opposite direction, he is now directly aligned with his original starting point, just 12 meters north of it.

Step 4: Finally, he turns left and walks 5 meters South (back toward his starting line).

To find his final position relative to the start:

He was 12 meters north, and then he moved 5 meters back south. This leaves him exactly 7 meters away from his starting point, straight ahead in the North direction.

2026 Prelims Reasoning

If DOG is written as WLT, how is CAT written?

A XZG

B XZK

C XZL

D YZL

Correct Answer: Option A

Here is how the code works:

Each letter in the word is replaced by its exact opposite letter from the reverse side of the alphabet. This means the first letter of the alphabet (A) pairs with the last letter (Z), the second letter (B) pairs with the second-to-last letter (Y), and so on.

Looking at DOG:

D is the 4th letter from the start, so it pairs with W (the 4th letter from the end).

O is the 12th letter from the end, so it pairs with L (the 12th letter from the start).

G is the 7th letter from the start, so it pairs with T (the 7th letter from the end).

Applying this exact same rule to CAT:

C is the 3rd letter from the start, so it pairs with X (the 3rd letter from the end).

A is the 1st letter from the start, so it pairs with Z (the 1st letter from the end).

T is the 7th letter from the end, so it pairs with G (the 7th letter from the start).

Putting it together, CAT becomes XZG.

2026 Prelims Reasoning

If COMPUTER is coded as FRPSXWHU, how is SCIENCE coded?

A VFLHQFH

B VFNHQFH

C VFJHQFH

D UFLHQFH

Correct Answer: Option A

Here is how the code works:

Every letter in the word COMPUTER is shifted forward by exactly 3 letters in the alphabet to get FRPSXWHU.

C moves forward 3 steps to F

O moves forward 3 steps to R

M moves forward 3 steps to P

P moves forward 3 steps to S

U moves forward 3 steps to X

T moves forward 3 steps to W

E moves forward 3 steps to H

R moves forward 3 steps to U

Now, apply this exact same "shift forward by 3" rule to the word SCIENCE:

S moves forward 3 steps (T, U, V) → V

C moves forward 3 steps (D, E, F) → F

I moves forward 3 steps (J, K, L) → L

E moves forward 3 steps (F, G, H) → H

N moves forward 3 steps (O, P, Q) → Q

C moves forward 3 steps (D, E, F) → F

E moves forward 3 steps (F, G, H) → H

Putting it all together, SCIENCE becomes VFLHQFH.

2026 Prelims Reasoning

Complete the Letter Series: A, C, B, E, D, H, ?

A F

B G

C E

D I

Correct Answer: Option A

This series actually consists of two alternating patterns combined into one. If you split the series into every other letter, the logic becomes very clear:

The First Pattern (1st, 3rd, 5th, 7th letters): A, B, D, ?

From A to B, we move forward 1 step.

From B to D, we move forward 2 steps.

Following this logic, from D to the next letter, we must move forward 3 steps. Moving forward 3 steps from D gives us G. (However, this would be the eighth letter in the series, not the seventh one we are looking for).

The Second Pattern (2nd, 4th, 6th, 7th letters):

C, E, H, ?

From C to E, we move forward 2 steps.

From E to H, we move forward 3 steps.

This pattern isn't the one filling our missing slot either, but it confirms how the alternating sequences work.

Let's look at the connection between the pairs directly to find the seventh letter:

A and C (C is 2 steps ahead of A)

B and E (E is 3 steps ahead of B)

D and H (H is 4 steps ahead of D)

The missing letter is the companion to H in the next transition. Because the first letters of each pair (A, B, D...) follow a "+1, +2, +3" progression, the letter immediately following H must step back down to continue the alternating sequence.

Specifically, looking at how the sequence goes back and forth:

A to C (up 2)

C to B (down 1)

B to E (up 3)

E to D (down 1)

D to H (up 4)

H to ? (down 1)

Stepping back 1 letter from H gives us G.

Wait, let's re-verify the alternating positions more simply:

Position 1: A * Position 3: B (A + 1)

Position 5: D (B + 2)

Position 7 (Our Target): G (D + 3)

Let's look at the even positions:

Position 2: C

Position 4: E (C + 2)

Position 6: H (E + 3)

If the target is Position 7, it belongs to the first group: A -> B -> D -> ?.

A to B is +1

B to D is +2

D to ? is +3.

Three letters after D is G.

Let's double check if G is an option. G is option B.

Is there an alternative pattern where F is the answer?

Let's check the relation between adjacent letters:

A (1) -> C (3) : +2

C (3) -> B (2) : -1

B (2) -> E (5) : +3

E (5) -> D (4) : -1

D (4) -> H (8) : +4

H (8) -> ? : -1

If the pattern is +2, -1, +3, -1, +4, -1...

Then after H, we subtract 1.

8 minus 1 is 7, which is G.

2026 Prelims Reasoning

Complete the Letter Series: AZ, BY, CX, DW,?

A EV

B EU

C EW

D DV

Correct Answer: Option A

This series is made up of pairs of letters, and each pair follows two distinct patterns:

The First Letter: Moves forward through the alphabet: A, B, C, D... The next letter is E.

The Second Letter: Moves backward from the end of the alphabet: Z, Y, X, W... The next letter is V.

When you combine them, you get EV.

(Fun tip: These pairs are also exact opposites of each other in the alphabet! A is the 1st letter, Z is the last. B is the 2nd, Y is the 2nd to last, and so on.)

2026 Prelims Reasoning

Complete the Letter Series: Z, X, U, Q, L, ?

A G

B F

C I

D J

Correct Answer: Option B

Think of the alphabet in terms of its standard numerical positions (Z = 26, Y = 25, X = 24, and so on):

Z is the 26th letter.

X is the 24th letter (moved back 2 steps from Z).

U is the 21st letter (moved back 3 steps from X).

Q is the 17th letter (moved back 4 steps from U).

L is the 12th letter (moved back 5 steps from Q).

Following this pattern, the next step must move back 6 steps from L.

Counting back 6 steps from the 12th letter brings us to the 6th letter of the alphabet, which is F.

Therefore, the correct choice is B) F.

2026 Prelims Reasoning

Complete the Number Series: 1, 3, 6, 10, 15, ?

A 18

B 20

C 21

D 22

Correct Answer: Option C

To find the missing number, we can look at how much the series increases with each step.

The difference between one and three is two.

The difference between three and six is three.

The difference between six and ten is four.

The difference between ten and fifteen is five.

The amount being added increases by one each time. Following this pattern, the next difference needs to be six.

Adding six to fifteen gives twenty one.

These numbers are also known as triangular numbers, as they can be arranged in a meaningful geometric pattern of dots.

2026 Prelims Reasoning

Complete the Number Series: 3, 8, 15, 24, 35, ?

A 46

B 48

C 49

D 50

Correct Answer: Option B

The correct answer is option B.

To find the missing number, we can look at the pattern of how the numbers increase.

The difference between three and eight is five.

The difference between eight and fifteen is seven.

The difference between fifteen and twenty four is nine.

The difference between twenty four and thirty five is eleven.

The amount being added increases by two each time. Following this pattern, the next difference needs to be thirteen.

Adding thirteen to thirty five gives forty eight.

Therefore, the missing number is forty eight, which corresponds to option B.

About JKSSB 2026 Previous Year Questions

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At Quintessence Classes, we believe that understanding past exam patterns is crucial for success in competitive examinations. Our curated PYQ collection helps students identify frequently tested topics, understand the difficulty level, and practice with real exam questions. Whether you are preparing for UPSC CSE, JKPSC KAS, or JKSSB exams, our previous year questions database is designed to give you an edge in your preparation.

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