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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 1151–1160 of 1,216
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Q.1151 Easy Reasoning Ability Puzzles & Seating Arrangement
A man walks 10 km north, then 5 km east, then 10 km south, then 5 km west. Where is he relative to starting point?
A At starting point
B 10 km north
C 5 km east
D 10 km east
Correct Answer:  A. At starting point
EXPLANATION

North 10 km + South 10 km = 0 net vertical. East 5 km + West 5 km = 0 net horizontal. Man returns to starting point.

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Q.1152 Medium Reasoning Ability Puzzles & Seating Arrangement
In a circular arrangement, 6 friends sit around a table. P sits opposite to Q. R is to the immediate right of P. S is between Q and R. T and U fill remaining seats. If T is to the left of Q, where is U sitting relative to P?
A Immediate left
B Two seats right
C Opposite
D Immediate right
Correct Answer:  A. Immediate left
EXPLANATION

Circular arrangement: P at top, Q opposite (bottom). R right of P. S between Q and R. T left of Q. U must be immediate left of P.

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Q.1153 Medium Reasoning Ability Puzzles & Seating Arrangement
All birds are animals. Some animals are mammals. Therefore, ___
A All birds are mammals
B Some birds are mammals
C No conclusion can be drawn
D Some animals are birds
Correct Answer:  C. No conclusion can be drawn
EXPLANATION

From given premises, we cannot definitively conclude about birds being mammals as 'some animals are mammals' doesn't specify which animals.

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Q.1154 Easy Reasoning Ability Puzzles & Seating Arrangement
Pointing to a photograph, a woman says 'This man's mother is my mother's daughter.' How is the man related to the woman?
A Brother
B Son
C Cousin
D Father
Correct Answer:  B. Son
EXPLANATION

Woman's mother's daughter = Woman herself. So man's mother = Woman. Therefore, man is Woman's son.

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Q.1155 Easy Reasoning Ability Puzzles & Seating Arrangement
If CRICKET is coded as FWHBMHW, how is PUZZLE coded?
A SXYYOH
B SXZZOH
C SUZZOH
D TUZZOH
Correct Answer:  B. SXZZOH
EXPLANATION

Each letter is shifted 3 positions forward (C→F, R→U, I→L, C→F, K→N, E→H, T→W). Applying same: P→S, U→X, Z→C(wraps), Z→C, L→O, E→H becomes SXZZOH.

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Q.1156 Easy Reasoning Ability Puzzles & Seating Arrangement
In a row of 8 people, A is 3rd from the left. B is 2 positions to the right of A. C is immediately to the left of B. What is C's position from the left?
A 4th
B 5th
C 6th
D 3rd
Correct Answer:  A. 4th
EXPLANATION

A is 3rd from left. B is 2 positions right of A = 5th position. C is immediately left of B = 4th position.

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Q.1157 Hard Reasoning Ability
Odd one out: 2, 5, 10, 17, 26, 36?
A 5
B 17
C 26
D 36
Correct Answer:  D. 36
EXPLANATION

This question asks you to identify which number doesn't follow the pattern established by the others in the sequence.

Step 1: Find the differences between consecutive terms

Calculate the gap between each pair of adjacent numbers.

\[2 \to 5: \text{ difference} = 3\]
\[5 \to 10: \text{ difference} = 5\]
\[10 \to 17: \text{ difference} = 7\]
\[17 \to 26: \text{ difference} = 9\]
\[26 \to 36: \text{ difference} = 10\]
Step 2: Identify the pattern in differences

The differences should follow a logical sequence of odd numbers.

\[\text{Differences: } 3, 5, 7, 9, 10\]
\[\text{Expected pattern: } 3, 5, 7, 9, 11\]
Step 3: Determine which number breaks the pattern

The difference between 26 and 36 is 10, but it should be 11 to maintain the pattern of consecutive odd numbers.

\[\text{Correct value should be: } 26 + 11 = 37 \text{ (not 36)}\]

**The odd one out is 36 (option D), because it breaks the pattern where differences

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Q.1158 Medium Reasoning Ability
Water image shows word flipped?
A Left-right
B Upside down
C Both
D No change
Correct Answer:  B. Upside down
EXPLANATION

This question asks about the orientation of a word's reflection when viewed in water (a mirror image).

Understanding Water/Mirror Reflection:

Water acts as a horizontal mirror surface. When you look at a word reflected in water, the reflection flips along the horizontal axis (top becomes bottom), not along the vertical axis (left-right remains the same).

Why Left-Right is incorrect:

Left-right reversal occurs with a vertical mirror (like a bathroom mirror), not a horizontal water surface.

Why Upside Down is correct:

A water reflection flips the image vertically — the top of the letters moves to the bottom and vice versa. If you write "HELLO" and look at its reflection in still water, it appears upside down as the vertical orientation is reversed.

Why Both and No Change are incorrect:

Water only flips vertically (upside down), not both directions, and there is definitely a change in orientation.

The word appears upside down when reflected in water because water acts as a horizontal mirror that reverses the vertical orientation of the image.

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Q.1159 Medium Reasoning Ability
If CLOUD=67394, LOUD=?
A 6394
B 7394
C 3948
D 3947
Correct Answer:  B. 7394
EXPLANATION

This question requires identifying the numerical code assigned to each letter in the word CLOUD, then using those values to decode LOUD.

Step 1: Decode the CLOUD sequence

Given that CLOUD = 67394, assign each letter its corresponding digit position.

\[C=6, \quad L=7, \quad O=3, \quad U=9, \quad D=4\]
Step 2: Identify letters in LOUD

The word LOUD contains the letters L, O, U, and D in that order.

\[\text{LOUD} = L, O, U, D\]
Step 3: Apply the code values to LOUD

Using the digit values decoded from CLOUD, substitute each letter in LOUD with its assigned number.

\[\text{LOUD} = 7, 3, 9, 4 = 7394\]

The answer is 7394, which is option (B).

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Q.1160 Easy Reasoning Ability
Series: 1, 4, 9, 16, 25, __?
A 30
B 36
C 35
D 40
Correct Answer:  B. 36
EXPLANATION

This question asks us to identify the pattern in a sequence of numbers and find the missing term.

Step 1: Identify the pattern

Look at each term and find what they represent.

\[1 = 1^2, \quad 4 = 2^2, \quad 9 = 3^2, \quad 16 = 4^2, \quad 25 = 5^2\]
Step 2: Recognize the sequence rule

Each term is a perfect square of consecutive natural numbers.

\[\text{Term}_n = n^2 \text{ where } n = 1, 2, 3, 4, 5, 6, ...\]
Step 3: Find the missing term

The next number in the sequence follows the pattern with n = 6.

\[\text{Term}_6 = 6^2 = 36\]

The missing term in the sequence is 36, making the answer (B).

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