Home Tests Defence NDA / CDS Reasoning Ability

Defence NDA / CDS
Reasoning Ability

NDA & CDS MCQ questions — Mathematics, English, GK, Reasoning for defence exams.

202 Q 4 Subjects 12th / Graduate
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Difficulty: All Easy Medium Hard 141–150 of 202
Subjects in Defence NDA / CDS
Q.141 Easy Reasoning Ability Puzzles & Seating Arrangement
Ravi's mother's father's son's daughter is Ravi's __?
A Sister
B Cousin
C Aunt
D Mother
Correct Answer:  B. Cousin
EXPLANATION

Ravi's mother's father = Ravi's grandfather. His son = Ravi's uncle. His daughter = Ravi's cousin.

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Q.142 Easy Reasoning Ability Puzzles & Seating Arrangement
1, 4, 9, 16, 25, 36, 49, __
A 64
B 63
C 62
D 65
Correct Answer:  A. 64
EXPLANATION

These are perfect squares: 1²=1, 2²=4, 3²=9, 4²=16, 5²=25, 6²=36, 7²=49, 8²=64.

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Q.143 Medium Reasoning Ability Puzzles & Seating Arrangement
No cats are dogs. All dogs are animals. Which statement is valid?
A All cats are animals
B Some cats are animals
C No cats are animals
D Conclusions cannot be determined
Correct Answer:  D. Conclusions cannot be determined
EXPLANATION

While all dogs are animals, cats could be or not be animals based on the premises. The first statement only tells us cats aren't dogs, not about their relationship with animals.

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Q.144 Easy Reasoning Ability Puzzles & Seating Arrangement
In a code, if PENCIL is written as 16-5-14-3-9-12, how is PAPER written?
A 16-1-16-5-18
B 15-1-16-5-18
C 16-1-15-5-18
D 16-1-16-4-18
Correct Answer:  A. 16-1-16-5-18
EXPLANATION

Each letter is coded by its position in the alphabet. P=16, A=1, P=16, E=5, R=18. So PAPER = 16-1-16-5-18.

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Q.145 Medium Reasoning Ability Puzzles & Seating Arrangement
Five boxes A, B, C, D, E are kept on a shelf. B is to the right of A. C is to the left of D. E is between C and D. D is to the right of B. What is the order?
A A-B-C-E-D
B A-B-D-E-C
C B-A-C-E-D
D A-C-E-B-D
Correct Answer:  A. A-B-C-E-D
EXPLANATION

B right of A: A-B. C left of D: C-D. E between C and D: C-E-D. D right of B: combining gives A-B-C-E-D.

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Q.146 Easy Reasoning Ability Puzzles & Seating Arrangement
FLOWER : REWOLF :: GARDEN : ?
A NEDRAG
B DEDNAG
C NERDGA
D NEDGRA
Correct Answer:  A. NEDRAG
EXPLANATION

The analogy reverses the spelling. FLOWER reversed = REWOLF. GARDEN reversed = NEDRAG.

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Q.147 Medium Reasoning Ability Puzzles & Seating Arrangement
All triangles are polygons. Some polygons are rectangles. Therefore:
A All triangles are rectangles
B Some triangles are rectangles
C No triangles are rectangles
D No definite conclusion can be drawn
Correct Answer:  D. No definite conclusion can be drawn
EXPLANATION

The premises don't establish a direct relationship between triangles and rectangles. While all triangles are polygons and some polygons are rectangles, we cannot conclude about the intersection of triangles and rectangles.

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Q.148 Medium Reasoning Ability Puzzles & Seating Arrangement
2, 5, 12, 27, 58, __, 246
A 121
B 119
C 125
D 116
Correct Answer:  A. 121
EXPLANATION

Pattern: Each term = 2 × previous term + 1. 2→5(2×2+1), 5→12(2×5+2), 12→27(2×12+3), 27→58(2×27+4), 58→121(2×58+5), 121→246(2×121+4).

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Q.149 Medium Reasoning Ability Puzzles & Seating Arrangement
If facing North-East, turning 135 degrees clockwise and then 45 degrees counter-clockwise, which direction are you facing?
A North
B East
C South
D West
Correct Answer:  B. East
EXPLANATION

Starting North-East (45°). Turn 135° clockwise: 45° + 135° = 180° (South). Turn 45° counter-clockwise: 180° - 45° = 135° (South-East), which simplifies to East direction.

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Q.150 Easy Reasoning Ability Puzzles & Seating Arrangement
Pointing to a photograph, a man says, 'She is the daughter of my mother's only son's wife.' Who is the woman in the photograph?
A His sister
B His daughter
C His cousin
D His niece
Correct Answer:  B. His daughter
EXPLANATION

Mother's only son = the man himself. His son's wife = his daughter-in-law. His daughter-in-law's daughter = his granddaughter or in simpler terms, his daughter through relation. Actually, it's his daughter directly.

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