Mental Reasoning MCQs with Answers for JKSSB, SSC & Railway

Question #81

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Find the missing term: 5, 10, 30, 120, ?

A. 480

B. 600

C. 500

D. 540

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Correct Answer: Option B

Explanation:
Multipliers are 2, 3, 4, 5: 5×2=10, 10×3=30, 30×4=120, so 120×5=600.

This question belongs to: Reasoning Mental Reasoning

Question #82

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Find the missing term: 1000, 200, 40, ?

A. 8

B. 6

C. 4

D. 10

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Correct Answer: Option A

Explanation:
Each term is divided by 5: 1000÷5=200, 200÷5=40, so 40÷5=8.

This question belongs to: Reasoning Mental Reasoning

Question #83

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Find the missing term: 3, 9, 27, 81, ?

A. 324

B. 243

C. 162

D. 216

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Correct Answer: Option B

Explanation:
Each term is multiplied by 3: 3×3=9, 9×3=27, 27×3=81, so 81×3=243.

This question belongs to: Reasoning Mental Reasoning

Question #84

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Find the missing term: 1, 2, 5, 10, 17, 26, ?

A. 36

B. 35

C. 38

D. 37

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Correct Answer: Option D

Explanation:
Differences are +1, +3, +5, +7, +9, so next difference is +11: 26+11=37.

This question belongs to: Reasoning Mental Reasoning

Question #85

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Find the missing term: 0, 7, 26, 63, ?

A. 125

B. 127

C. 124

D. 126

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Correct Answer: Option C

Explanation:
The terms follow n³-1: 1³-1=0, 2³-1=7, 3³-1=26, 4³-1=63, so next is 5³-1=124.

This question belongs to: Reasoning Mental Reasoning

Question #86

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Find the missing term: 2, 3, 5, 8, 13, ?

A. 18

B. 19

C. 21

D. 20

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Correct Answer: Option C

Explanation:
Each term is the sum of the previous two: 2+3=5, 3+5=8, 5+8=13, so 8+13=21.

This question belongs to: Reasoning Mental Reasoning

Question #87

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Find the missing term: 4, 6, 10, 18, 34, ?

A. 58

B. 66

C. 62

D. 64

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Correct Answer: Option B

Explanation:
Differences are +2, +4, +8, +16, each doubling; next difference is +32, so 34+32=66.

This question belongs to: Reasoning Mental Reasoning

Question #88

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Find the missing term: 3, 7, 15, 31, 63, ?

A. 129

B. 125

C. 131

D. 127

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2 and 1 added: 3×2+1=7, 7×2+1=15, 15×2+1=31, 31×2+1=63, so 63×2+1=127.

This question belongs to: Reasoning Mental Reasoning

Question #89

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Find the missing term: 2, 5, 14, 41, ?

A. 126

B. 122

C. 124

D. 120

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Correct Answer: Option B

Explanation:
Each term is multiplied by 3 and 1 is subtracted: 2×3-1=5, 5×3-1=14, 14×3-1=41, so 41×3-1=122.

This question belongs to: Reasoning Mental Reasoning

Question #90

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Find the missing term: 8, 27, 64, 125, ?

A. 196

B. 226

C. 206

D. 216

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Correct Answer: Option D

Explanation:
The terms are cubes: 2³=8, 3³=27, 4³=64, 5³=125, so next is 6³=216.

This question belongs to: Reasoning Mental Reasoning

Question #91

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Find the missing term: 1, 3, 6, 10, 15, ?

A. 18

B. 21

C. 19

D. 20

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Correct Answer: Option B

Explanation:
Triangular numbers: n(n+1)/2. 1, 3, 6, 10, 15 correspond to n=1 to 5, so next is 6×7/2=21.

This question belongs to: Reasoning Mental Reasoning

Question #92

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Find the missing term: 4, 9, 25, 49, ?

A. 169

B. 81

C. 121

D. 100

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Correct Answer: Option C

Explanation:
These are squares of consecutive prime numbers: 2²=4, 3²=9, 5²=25, 7²=49, so next is 11²=121.

This question belongs to: Reasoning Mental Reasoning

Question #93

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Find the missing term: 2, 6, 12, 20, 30, 42, ?

A. 56

B. 64

C. 54

D. 50

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Correct Answer: Option A

Explanation:
Pattern n(n+1): 1×2=2, 2×3=6, 3×4=12, 4×5=20, 5×6=30, 6×7=42, so next is 7×8=56.

This question belongs to: Reasoning Mental Reasoning

Question #94

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Find the missing term: 10, 20, 40, 70, 110, ?

A. 160

B. 140

C. 150

D. 170

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Correct Answer: Option A

Explanation:
Differences are +10, +20, +30, +40, so next difference is +50: 110+50=160.

This question belongs to: Reasoning Mental Reasoning

Question #95

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Find the missing term: 6, 9, 15, 21, 33, ?

A. 42

B. 39

C. 45

D. 51

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Correct Answer: Option B

Explanation:
These are products of 3 and consecutive primes: 2×3=6, 3×3=9, 5×3=15, 7×3=21, 11×3=33, so next is 13×3=39.

This question belongs to: Reasoning Mental Reasoning

Question #96

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Find the missing term: 1, 4, 13, 40, ?

A. 121

B. 120

C. 122

D. 119

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Correct Answer: Option A

Explanation:
Each term is multiplied by 3 and 1 added: 1×3+1=4, 4×3+1=13, 13×3+1=40, so 40×3+1=121.

This question belongs to: Reasoning Mental Reasoning

Question #97

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Find the missing term: 3, 5, 9, 17, 33, ?

A. 64

B. 66

C. 63

D. 65

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Correct Answer: Option D

Explanation:
Each term is multiplied by 2 and 1 subtracted: 3×2-1=5, 5×2-1=9, 9×2-1=17, 17×2-1=33, so 33×2-1=65.

This question belongs to: Reasoning Mental Reasoning

Question #98

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Find the missing term: 5, 8, 13, 20, 29, ?

A. 39

B. 40

C. 41

D. 38

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Correct Answer: Option B

Explanation:
Differences are +3, +5, +7, +9, so next difference is +11: 29+11=40.

This question belongs to: Reasoning Mental Reasoning

Question #99

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Find the missing term: 2, 4, 8, 14, 22, ?

A. 28

B. 32

C. 30

D. 34

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Correct Answer: Option B

Explanation:
Differences are +2, +4, +6, +8, so next difference is +10: 22+10=32.

This question belongs to: Reasoning Mental Reasoning

Question #100

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Find the missing term: 12, 24, 36, 48, ?

A. 56

B. 58

C. 62

D. 60

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Correct Answer: Option D

Explanation:
Arithmetic progression with common difference 12: 48+12=60.

This question belongs to: Reasoning Mental Reasoning

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