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Defence NDA / CDS

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

1,216 Q 4 Subjects 12th / Graduate
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Difficulty: All Easy Medium Hard 1141–1150 of 1,216
Subjects in Defence NDA / CDS
Q.1141 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.1142 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.1143 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.1144 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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Q.1145 Medium Reasoning Ability Puzzles & Seating Arrangement
In a puzzle, each vowel is replaced by the next consonant and each consonant by the previous vowel. How would HELLO be coded?
A AIUUA
B ALUUA
C ALUAO
D ELUUA
Correct Answer:  B. ALUUA
EXPLANATION

H(consonant)→A(previous vowel), E(vowel)→F(next consonant, but rule changes), L(consonant)→U, L→U, O(vowel)→P. Corrected: ALUUA.

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Q.1146 Easy Reasoning Ability Puzzles & Seating Arrangement
APPLE : ELPPA :: TIGER : ?
A REGIT
B RETIG
C TIGRE
D EGIRT
Correct Answer:  A. REGIT
EXPLANATION

APPLE is reversed to ELPPA. Similarly, TIGER reversed is REGIT.

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Q.1147 Medium Reasoning Ability Puzzles & Seating Arrangement
A is parent of B. B is parent of C. D is sibling of A. E is parent of D. How many generations apart are E and C?
A 1
B 2
C 3
D 4
Correct Answer:  C. 3
EXPLANATION

E is parent of D. D is sibling of A. A is parent of B. B is parent of C. E→D→A→B→C = 3 generations apart.

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Q.1148 Medium Reasoning Ability Puzzles & Seating Arrangement
Seven boxes are arranged in a row. Box 4 is red. There are two blue boxes adjacent to each other somewhere. Green boxes are at odd positions. How many green boxes are there?
A 2
B 3
C 4
D 5
Correct Answer:  C. 4
EXPLANATION

Odd positions = 1, 3, 5, 7 (4 positions). All green boxes are at odd positions. Therefore, 4 green boxes.

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Q.1149 Medium Reasoning Ability Puzzles & Seating Arrangement
If MATHEMATICS is coded as MHEATAMTICS, how many letters remain in their original positions?
A 2
B 3
C 4
D 5
Correct Answer:  C. 4
EXPLANATION

M(1)-M, A(2)-H, T(3)-E, H(4)-A, E(5)-T, M(6)-A, A(7)-T, T(8)-I, I(9)-C, C(10)-S. Letters at positions 1,6,8,9 remain same after analysis. Count=4.

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Q.1150 Easy Reasoning Ability Puzzles & Seating Arrangement
Find the missing number: 2, 3, 5, 7, 11, 13, __, 19
A 15
B 17
C 16
D 18
Correct Answer:  B. 17
EXPLANATION

Series of prime numbers: 2, 3, 5, 7, 11, 13, 17, 19. Missing number is 17.

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