Mental Reasoning MCQs with Answers for JKSSB, SSC & Railway

Question #41

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Find the missing term: 100, 81, 64, 49, ?

A. 36

B. 25

C. 32

D. 35

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Correct Answer: Option A

Explanation:
The terms are decreasing squares: 10²=100, 9²=81, 8²=64, 7²=49, so next is 6²=36.

This question belongs to: Reasoning Mental Reasoning

Question #42

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Find the odd one out: 17, 19, 23, 27, 29

A. 19

B. 29

C. 27

D. 17

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Correct Answer: Option C

Explanation:
All others are prime numbers; 27 is a composite number.

This question belongs to: Reasoning Mental Reasoning

Question #43

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Find the odd one out: 8, 27, 64, 100, 216

A. 27

B. 64

C. 100

D. 216

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Correct Answer: Option C

Explanation:
All others are perfect cubes (2³, 3³, 4³, 6³); 100 is not a cube.

This question belongs to: Reasoning Mental Reasoning

Question #44

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Find the odd one out: 3, 7, 11, 15, 19

A. 11

B. 15

C. 7

D. 19

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Correct Answer: Option B

Explanation:
All others are prime numbers; 15 is composite.

This question belongs to: Reasoning Mental Reasoning

Question #45

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Find the odd one out: 10, 20, 30, 45, 50

A. 50

B. 20

C. 30

D. 45

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Correct Answer: Option D

Explanation:
All others are exact multiples of 10; 45 is not divisible by 10.

This question belongs to: Reasoning Mental Reasoning

Question #46

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Find the odd one out: 12, 18, 24, 30, 37

A. 12

B. 37

C. 24

D. 18

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Correct Answer: Option B

Explanation:
All others are multiples of 6; 37 is not divisible by 6.

This question belongs to: Reasoning Mental Reasoning

Question #47

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If CAT is coded as DBU, how is DOG coded?

A. EPI

B. EPH

C. FPH

D. EQH

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Correct Answer: Option B

Explanation:
Each letter is shifted forward by 1: C→D, A→B, T→U; therefore D→E, O→P, G→H, giving EPH.

This question belongs to: Reasoning Mental Reasoning

Question #48

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If PEN is coded as QFO, how is TIN coded?

A. VJP

B. UJP

C. VJO

D. UJO

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Correct Answer: Option D

Explanation:
Each letter is shifted forward by 1: P→Q, E→F, N→O; so T→U, I→J, N→O, giving UJO.

This question belongs to: Reasoning Mental Reasoning

Question #49

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If APPLE is coded as BQQMF, how is MANGO coded?

A. NBOIP

B. NBPHP

C. NBOHQ

D. NBOHP

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Correct Answer: Option D

Explanation:
Each letter is shifted forward by 1: A→B, P→Q, P→Q, L→M, E→F; M→N, A→B, N→O, G→H, O→P gives NBOHP.

This question belongs to: Reasoning Mental Reasoning

Question #50

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If IN is coded as JO and AT as BU, then TO is coded as?

A. VP

B. UQ

C. UP

D. TP

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Correct Answer: Option C

Explanation:
The rule is shifting each letter forward by 1: I→J, N→O and A→B, T→U; so T→U, O→P, giving UP.

This question belongs to: Reasoning Mental Reasoning

Question #51

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If FISH is coded as EHRG, how is BIRD coded?

A. AHQC

B. AIQC

C. AHQD

D. AHPC

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Correct Answer: Option A

Explanation:
Each letter is shifted backward by 1: F→E, I→H, S→R, H→G; B→A, I→H, R→Q, D→C gives AHQC.

This question belongs to: Reasoning Mental Reasoning

Question #52

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If 3 is coded as 6, 4 as 12, 5 as 20, then 6 is coded as?

A. 36

B. 42

C. 24

D. 30

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Correct Answer: Option D

Explanation:
The pattern is n×(n-1): 3×2=6, 4×3=12, 5×4=20, so 6×5=30.

This question belongs to: Reasoning Mental Reasoning

Question #53

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If 2 is coded as 4, 3 as 9, 4 as 16, then 7 is coded as?

A. 36

B. 49

C. 56

D. 42

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Correct Answer: Option B

Explanation:
The code is n²: 2²=4, 3²=9, 4²=16, so 7²=49.

This question belongs to: Reasoning Mental Reasoning

Question #54

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If 5 is coded as 25, 6 as 36, 7 as 49, then 8 is coded as?

A. 56

B. 72

C. 64

D. 81

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Correct Answer: Option C

Explanation:
The code is n²: 5²=25, 6²=36, 7²=49, so 8²=64.

This question belongs to: Reasoning Mental Reasoning

Question #55

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If 2 is coded as 3, 3 as 8, 4 as 15, then 5 is coded as?

A. 26

B. 24

C. 20

D. 22

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Correct Answer: Option B

Explanation:
The code is n²-1: 2²-1=3, 3²-1=8, 4²-1=15, so 5²-1=24.

This question belongs to: Reasoning Mental Reasoning

Question #56

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A is B's brother, B is C's sister, C is D's father. How is A related to D?

A. Uncle

B. Father

C. Grandfather

D. Cousin

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Correct Answer: Option A

Explanation:
B is C's sister, so C and B are siblings. A is B's brother, so A is also C's brother. Since C is D's father, A is D's uncle.

This question belongs to: Reasoning Mental Reasoning

Question #57

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A man walks 5 km north, turns right and walks 3 km, then turns right and walks 5 km. In which direction is he from his starting point?

A. West

B. South

C. East

D. North

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Correct Answer: Option C

Explanation:
Starting at origin, he goes 5 km north, then 3 km east, then 5 km south. His final position is 3 km east of the start.

This question belongs to: Reasoning Mental Reasoning

Question #58

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A person walks 10 m east, turns left and walks 5 m, then turns left and walks 10 m. How far is he from the starting point?

A. 5 m

B. 20 m

C. 15 m

D. 10 m

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Correct Answer: Option A

Explanation:
He goes 10 m east, then 5 m north, then 10 m west. He is now 5 m north of the starting point.

This question belongs to: Reasoning Mental Reasoning

Question #59

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Ravi walks 6 km north, then turns left and walks 8 km. How far is he from the starting point?

A. 14 km

B. 10 km

C. 8 km

D. 12 km

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Correct Answer: Option B

Explanation:
His path forms a right-angled triangle with legs 6 km and 8 km. Distance = √(6²+8²) = √(36+64)=√100=10 km.

This question belongs to: Reasoning Mental Reasoning

Question #60

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A man facing north turns 180° clockwise, then turns 90° anti-clockwise. Which direction is he facing now?

A. East

B. South

C. North

D. West

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Correct Answer: Option A

Explanation:
From north, 180° clockwise takes him to south. Then 90° anti-clockwise from south takes him to east.

This question belongs to: Reasoning Mental Reasoning

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