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 151–160 of 202
Subjects in Defence NDA / CDS
Q.151 Medium Reasoning Ability Puzzles & Seating Arrangement
In a certain code, MATHEMATICS is written as 13-1-20-8-5-13-1-20-9-3-19. How is SCIENCE written?
A 19-3-9-5-14-3-5
B 19-3-9-5-14-3-6
C 20-3-9-5-14-3-5
D 19-4-9-5-14-3-5
Correct Answer:  A. 19-3-9-5-14-3-5
EXPLANATION

The code uses position of letters in the alphabet. S=19, C=3, I=9, E=5, N=14, C=3, E=5. Therefore SCIENCE = 19-3-9-5-14-3-5.

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Q.152 Hard Reasoning Ability Puzzles & Seating Arrangement
Seven people A, B, C, D, E, F, G sit around a circular table facing the center. D sits second to the left of A. B sits third to the right of A. E sits between C and F. Who sits to the immediate right of G?
A C
B E
C F
D A
Correct Answer:  A. C
EXPLANATION

Using circular arrangement logic: A's position is fixed. D is 2nd to left (clockwise from A's perspective). B is 3rd to right. E between C and F helps determine the remaining positions. C sits to immediate right of G.

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Q.153 Medium Reasoning Ability Puzzles & Seating Arrangement
If going east is turning right from north, and going west is turning left from north, then going southwest is equivalent to turning ___ degrees from north (clockwise).
A 225
B 315
C 135
D 45
Correct Answer:  A. 225
EXPLANATION

North=0°, East=90°, South=180°, West=270°. Southwest is between South and West = 225° (clockwise from North).

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Q.154 Medium Reasoning Ability Puzzles & Seating Arrangement
In a logic puzzle, each animal belongs to exactly one group: mammals, birds, or reptiles. All dogs are mammals. Some pets are birds. Therefore, __
A All dogs are pets
B Some pets are mammals
C Dogs cannot be pets
D All pets are mammals
Correct Answer:  B. Some pets are mammals
EXPLANATION

Dogs are mammals. Some pets are birds. This implies remaining pets could be mammals. Therefore, some pets are mammals (valid).

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Q.155 Medium Reasoning Ability Puzzles & Seating Arrangement
A woman's son's mother's husband is the woman's __
A Father
B Husband
C Uncle
D Brother
Correct Answer:  B. Husband
EXPLANATION

Woman's son's mother = Woman. Woman's mother's husband = Woman's father. No wait: son's mother = woman. Woman's husband = husband.

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Q.156 Easy Reasoning Ability Puzzles & Seating Arrangement
12, 24, 48, 96, 192, __
A 384
B 288
C 256
D 240
Correct Answer:  A. 384
EXPLANATION

Each number is multiplied by 2. 12×2=24, 24×2=48, 48×2=96, 96×2=192, 192×2=384.

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Q.157 Hard Reasoning Ability Puzzles & Seating Arrangement
Six people A, B, C, D, E, F sit around a square table (one on each side, two at each corner). D is opposite to B. C is to the left of D. E is at a corner. Which position is A most likely to occupy?
A Opposite to C
B Adjacent to E
C Opposite to E
D Cannot be determined
Correct Answer:  C. Opposite to E
EXPLANATION

Square table with 6 people (4 sides + 2 corners). D opposite B. C left of D. E at corner. A's position determined by elimination. A is opposite to E.

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Q.158 Easy Reasoning Ability Puzzles & Seating Arrangement
In a certain code, BOOK is written as 2-15-15-11. How is TABLE written?
A 20-1-2-12-5
B 19-1-2-12-4
C 20-1-2-11-5
D 19-1-2-12-5
Correct Answer:  A. 20-1-2-12-5
EXPLANATION

A=1, B=2...Z=26. BOOK: B=2, O=15, O=15, K=11. TABLE: T=20, A=1, B=2, L=12, E=5 = 20-1-2-12-5.

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Q.159 Medium Reasoning Ability Puzzles & Seating Arrangement
All roses are flowers. Some flowers fade quickly. Which of the following is a valid conclusion?
A All roses fade quickly
B Some roses fade quickly
C No roses fade quickly
D Roses never fade quickly
Correct Answer:  B. Some roses fade quickly
EXPLANATION

Some flowers fade quickly, and roses are flowers. Therefore, some roses may fade quickly (valid conclusion).

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Q.160 Hard Reasoning Ability Puzzles & Seating Arrangement
P, Q, R, S, T are sitting in a line. Q is between P and R. S is at one end. T is not adjacent to Q. Which of the following is definitely true?
A P is at the left end
B S and P are adjacent
C R is at the right end
D T is adjacent to S
Correct Answer:  D. T is adjacent to S
EXPLANATION

S at one end. Q between P and R (P-Q-R or R-Q-P). T not adjacent to Q. Only valid: S-T-P-Q-R or S-T-R-Q-P. T is adjacent to S.

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