Mental Reasoning MCQs with Answers for JKSSB, SSC & Railway

Question #1

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

A. 40

B. 42

C. 46

D. 44

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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

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

A. 45

B. 48

C. 46

D. 50

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Correct Answer: Option B

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

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

A. 160

B. 120

C. 150

D. 140

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Correct Answer: Option A

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

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

A. 35

B. 49

C. 30

D. 36

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Correct Answer: Option D

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

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

A. 12

B. 13

C. 17

D. 15

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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

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

A. 11

B. 12

C. 10

D. 13

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Correct Answer: Option D

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

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

A. 18

B. 21

C. 16

D. 20

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Correct Answer: Option A

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

This question belongs to: Reasoning Mental Reasoning

Question #8

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

A. 35

B. 25

C. 20

D. 30

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Correct Answer: Option B

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

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

A. 324

B. 504

C. 498

D. 486

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Correct Answer: Option D

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

This question belongs to: Reasoning Mental Reasoning

Question #10

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

A. 5

B. 15

C. 10

D. 20

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Correct Answer: Option B

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

This question belongs to: Reasoning Mental Reasoning

Question #11

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

A. 35

B. 36

C. 30

D. 49

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Correct Answer: Option B

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

This question belongs to: Reasoning Mental Reasoning

Question #12

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

A. 27

B. 25

C. 29

D. 31

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Correct Answer: Option C

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

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

A. 34

B. 36

C. 33

D. 35

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Correct Answer: Option D

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

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

A. 37

B. 35

C. 39

D. 36

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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

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

A. 86

B. 71

C. 81

D. 76

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Correct Answer: Option C

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

This question belongs to: Reasoning Mental Reasoning

Question #16

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

A. 244

B. 236

C. 168

D. 224

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Correct Answer: Option D

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

This question belongs to: Reasoning Mental Reasoning

Question #17

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

A. 144

B. 121

C. 100

D. 125

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Correct Answer: Option D

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

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

A. 72

B. 64

C. 48

D. 56

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Correct Answer: Option B

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

This question belongs to: Reasoning Mental Reasoning

Question #19

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

A. 17

B. 16

C. 15

D. 14

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Correct Answer: Option B

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

This question belongs to: Reasoning Mental Reasoning

Question #20

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

A. 63

B. 64

C. 62

D. 65

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Correct Answer: Option A

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

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