Mental Reasoning MCQs with Answers for JKSSB, SSC & Railway

Question #1

Share Report

Find the missing term in the series: 2, 6, 12, 20, 30, ?

A. 46

B. 42

C. 40

D. 44

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
The pattern is n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, so the next term is 6×7=42.

This question belongs to: Reasoning Mental Reasoning

Question #2

Share Report

Find the missing term: 3, 8, 15, 24, 35, ?

A. 50

B. 45

C. 48

D. 46

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option C

Explanation:
The series follows n² - 1: 2²-1=3, 3²-1=8, 4²-1=15, 5²-1=24, 6²-1=35, so next is 7²-1=48.

This question belongs to: Reasoning Mental Reasoning

Question #3

Share Report

Find the missing term: 5, 10, 20, 40, 80, ?

A. 120

B. 150

C. 140

D. 160

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option D

Explanation:
Each term is multiplied by 2: 5×2=10, 10×2=20, 20×2=40, 40×2=80, so next is 80×2=160.

This question belongs to: Reasoning Mental Reasoning

Question #4

Share Report

Find the missing term: 1, 4, 9, 16, 25, ?

A. 30

B. 36

C. 35

D. 49

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
These are consecutive perfect squares: 1²=1, 2²=4, 3²=9, 4²=16, 5²=25, so next is 6²=36.

This question belongs to: Reasoning Mental Reasoning

Question #5

Share Report

Find the missing term: 2, 3, 5, 7, 11, ?

A. 17

B. 13

C. 12

D. 15

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
The series contains consecutive prime numbers: 2, 3, 5, 7, 11, and the next prime is 13.

This question belongs to: Reasoning Mental Reasoning

Question #6

Share Report

Find the missing term: 1, 1, 2, 3, 5, 8, ?

A. 11

B. 13

C. 10

D. 12

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
This is the Fibonacci series where each term is the sum of the previous two: 5+8=13.

This question belongs to: Reasoning Mental Reasoning

Question #7

Share Report

Find the missing term: 3, 6, 9, 12, 15, ?

A. 18

B. 16

C. 21

D. 20

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
The terms increase by 3 each time: 15+3=18.

This question belongs to: Reasoning Mental Reasoning

Question #8

Share Report

Find the missing term: 100, 95, 85, 70, 50, ?

A. 20

B. 30

C. 25

D. 35

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option C

Explanation:
The differences are -5, -10, -15, -20, so the next difference is -25: 50-25=25.

This question belongs to: Reasoning Mental Reasoning

Question #9

Share Report

Find the missing term: 2, 6, 18, 54, 162, ?

A. 504

B. 486

C. 324

D. 498

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
Each term is multiplied by 3: 162×3=486.

This question belongs to: Reasoning Mental Reasoning

Question #10

Share Report

Find the missing term: 240, 120, 60, 30, ?

A. 15

B. 5

C. 10

D. 20

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
Each term is divided by 2: 30÷2=15.

This question belongs to: Reasoning Mental Reasoning

Question #11

Share Report

Find the missing term: 4, 9, 16, 25, ?

A. 36

B. 35

C. 49

D. 30

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
The terms are 2², 3², 4², 5², so the next is 6²=36.

This question belongs to: Reasoning Mental Reasoning

Question #12

Share Report

Find the missing term: 11, 13, 17, 19, 23, ?

A. 29

B. 25

C. 31

D. 27

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
These are consecutive prime numbers after 11: 11, 13, 17, 19, 23, and the next prime is 29.

This question belongs to: Reasoning Mental Reasoning

Question #13

Share Report

Find the missing term: 0, 3, 8, 15, 24, ?

A. 33

B. 35

C. 34

D. 36

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
The series follows n²-1: 1²-1=0, 2²-1=3, 3²-1=8, 4²-1=15, 5²-1=24, so next is 6²-1=35.

This question belongs to: Reasoning Mental Reasoning

Question #14

Share Report

Find the missing term: 2, 5, 10, 17, 26, ?

A. 37

B. 35

C. 39

D. 36

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
The terms follow n²+1: 1²+1=2, 2²+1=5, 3²+1=10, 4²+1=17, 5²+1=26, so next is 6²+1=37.

This question belongs to: Reasoning Mental Reasoning

Question #15

Share Report

Find the missing term: 6, 11, 21, 36, 56, ?

A. 86

B. 81

C. 76

D. 71

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
Differences: +5, +10, +15, +20, so next difference is +25: 56+25=81.

This question belongs to: Reasoning Mental Reasoning

Question #16

Share Report

Find the missing term: 7, 14, 28, 56, 112, ?

A. 168

B. 224

C. 236

D. 244

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
Each term is multiplied by 2: 112×2=224.

This question belongs to: Reasoning Mental Reasoning

Question #17

Share Report

Find the missing term: 1, 8, 27, 64, ?

A. 144

B. 125

C. 121

D. 100

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option B

Explanation:
The terms are cubes: 1³=1, 2³=8, 3³=27, 4³=64, so next is 5³=125.

This question belongs to: Reasoning Mental Reasoning

Question #18

Share Report

Find the missing term: 2, 4, 8, 16, 32, ?

A. 64

B. 48

C. 72

D. 56

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
Each term is double the previous term: 32×2=64.

This question belongs to: Reasoning Mental Reasoning

Question #19

Share Report

Find the missing term: 1, 2, 4, 7, 11, ?

A. 16

B. 14

C. 15

D. 17

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option A

Explanation:
Differences: +1, +2, +3, +4, so next difference is +5: 11+5=16.

This question belongs to: Reasoning Mental Reasoning

Question #20

Share Report

Find the missing term: 1, 3, 7, 15, 31, ?

A. 64

B. 65

C. 62

D. 63

View Answer & Solution Discuss

Get Complete Subject PDF for Reasoning

Correct Answer: Option D

Explanation:
Each term is double plus 1: 1×2+1=3, 3×2+1=7, 7×2+1=15, 15×2+1=31, so next is 31×2+1=63.

This question belongs to: Reasoning Mental Reasoning

Mental Reasoning MCQs

Practice Questions

More Reasoning Topics