Home Tests Defence NDA / CDS Reasoning Ability

Defence NDA / CDS
Reasoning Ability

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

30 Q 4 Subjects 12th / Graduate
Take Mock Test
Difficulty: All Easy Medium Hard 1–10 of 30
Advertisement
Q.1 Hard Reasoning Ability Puzzles & Seating Arrangement
If in a code MOBILE is written as NRCKDH, then SIMPLE is written as:
A TJNRME
B TJNQME
C SJNQME
D TJMQME
Correct Answer:  B. TJNQME
EXPLANATION

M→N(+1), O→R(+3), B→C(+1), I→K(+2), L→D(+3, wrapping), E→H(+3). For SIMPLE using variable shifts: S→T(+1), I→J(+1), M→N(+1), P→Q(+1), L→M(+1), E→E(0) = TJNQME.

Take Test
Q.2 Hard Reasoning Ability Puzzles & Seating Arrangement
In a circular arrangement of 8 people, P is opposite to T. Q is third to the right of P. R is second to the left of T. Who is sitting between R and Q (going clockwise from R)?
A P
B T
C Cannot be determined
D 4 people
Correct Answer:  C. Cannot be determined
EXPLANATION

With 8 people in circle, opposite means 4 seats apart. If P at position 1, T at position 5. Q third right of P: position 4. R second left of T: position 3. Between R(3) and Q(4) going clockwise: nobody directly, but without complete arrangement, exact answer cannot be determined uniquely.

Take Test
Q.3 Hard Reasoning Ability Puzzles & Seating Arrangement
A woman's son's mother's father's only daughter is the woman herself. What is the relation?
A Logical consistency
B Logical contradiction
C Paradox
D Valid
Correct Answer:  A. Logical consistency
EXPLANATION

Woman → Son's mother = Woman. Woman's father = Boy's grandfather. Grandfather's only daughter = Woman. This is logically consistent - she is indeed her son's mother and her father's only daughter.

Take Test
Q.4 Hard Reasoning Ability Puzzles & Seating Arrangement
Eight boxes labeled 1-8 are arranged in a line. Box 3 is between boxes 2 and 4. Box 5 is immediately right of box 4. Box 8 is immediately left of box 1. What is the arrangement?
A 8,1,2,3,4,5,6,7
B 1,2,3,4,5,6,7,8
C 2,3,4,5,1,6,7,8
D Cannot be determined
Correct Answer:  D. Cannot be determined
EXPLANATION

The constraints 'Box 3 between 2&4' and 'Box 5 right of Box 4' and 'Box 8 left of Box 1' create conflicting arrangements in a linear sequence. Box 8 cannot be immediately left of Box 1 in a line where boxes are numbered sequentially.

Take Test
Q.5 Hard Reasoning Ability Puzzles & Seating Arrangement
In a complex arrangement, 9 boxes are placed in 3 rows and 3 columns. Box at position (1,2) contains Red balls. Position (2,3) contains Green balls. Position (3,1) contains Blue balls. If you need to place Yellow balls such that no two colors share a row or column, where should Yellow go?
A (2,1)
B (2,2)
C (3,2)
D (1,3)
Correct Answer:  A. (2,1)
EXPLANATION

Red at (1,2) blocks row 1 and column 2. Green at (2,3) blocks row 2 and column 3. Blue at (3,1) blocks row 3 and column 1. Yellow must avoid: rows 1,2,3 and columns 1,2,3 - impossible for standard placement, but (2,1) conflicts with Blue's column 1. Rechecking: (1,3) at row 1 conflicts with Red's row. (2,1) at column 1 conflicts with Blue's column. Best option avoiding maximum conflicts: (2,1).

Take Test
Advertisement
Q.6 Hard Reasoning Ability Puzzles & Seating Arrangement
6 boxes are arranged in a row. Box 2 is heavier than Box 1. Box 4 is lighter than Box 3. Box 5 is heavier than Box 6. If Box 3 is heavier than all others, which box is the lightest?
A Box 1
B Box 6
C Cannot be determined
D Box 4
Correct Answer:  C. Cannot be determined
EXPLANATION

While we know Box 4 < Box 3 and Box 6 < Box 5, we cannot definitively compare Box 1, 2, 4, and 6 to determine the lightest.

Take Test
Q.7 Hard Reasoning Ability Puzzles & Seating Arrangement
In a coding system, vowels are replaced by the next consonant and consonants by the next vowel. How is LOGIC coded?
A AOKEY
B AOGIC
C AMGIK
D AOKEK
Correct Answer:  D. AOKEK
EXPLANATION

L(consonant→A), O(vowel→next consonant P→K), G(consonant→I), I(vowel→K), C(consonant→E). Result: AOKEK

Take Test
Q.8 Hard Reasoning Ability Puzzles & Seating Arrangement
Seven containers are arranged in order. Container 3 has more items than Container 2. Container 5 has fewer items than Container 6. Container 7 has the most items. If Container 4 has more than Container 3, which container has more items: Container 2 or Container 5?
A Container 2
B Container 5
C Both have equal items
D Cannot be determined
Correct Answer:  D. Cannot be determined
EXPLANATION

The given conditions don't establish a direct comparison between Container 2 and Container 5.

Take Test
Q.9 Hard Reasoning Ability Puzzles & Seating Arrangement
In a linear arrangement of 8 seats, P, Q, R, S, T, U, V, W sit in a row. P sits at one end. Q sits 3rd from the left. T sits between R and S. U sits to the immediate right of Q. Who sits at the right end?
A V
B W
C Cannot be determined
D T
Correct Answer:  C. Cannot be determined
EXPLANATION

Insufficient information provided about positions of all people relative to given constraints.

Take Test
Q.10 Hard Reasoning Ability Puzzles & Seating Arrangement
Seven students P, Q, R, S, T, U, V are ranked. T ranks higher than R. U ranks higher than Q but lower than S. P ranks lowest. How many students rank lower than Q?
A 2
B 3
C At least 1
D Cannot be determined
Correct Answer:  D. Cannot be determined
EXPLANATION

While we know P is lowest and relative positions of others, Q's exact position relative to all students cannot be uniquely determined from given constraints.

Take Test
IGET
iget AI
Online · Ask anything about exams
Hi! 👋 I'm your iget AI assistant.

Ask me anything about exam prep, MCQ solutions, study tips, or strategies! 🎯
UPSC strategy SSC CGL syllabus Improve aptitude NEET Biology tips