Part II — Reasoning Ability

Chapter 2: Reasoning Fundamentals

2.1 Puzzles and Seating Arrangements

Seating arrangement puzzles (linear, circular, or box-based) require systematically diagramming given clues and eliminating impossible configurations until a unique valid arrangement remains. Puzzles more broadly (e.g., ranking, floor-based, scheduling) apply the same systematic elimination approach to non-seating scenarios.

2.2 Blood Relations and Direction Sense

Blood relation problems trace family relationships through a chain of statements, best solved via a family-tree diagram distinguishing generations and gender. Direction sense problems track movement in various directions (from a reference point, typically facing north) to determine final position or distance, best solved by plotting on a coordinate grid.

2.3 Coding-Decoding and Symbolic Operations

Coding-decoding questions establish a letter/number substitution pattern from an example, applied consistently to a new word. Symbolic operation questions redefine standard arithmetic symbols (e.g., "@" means "add", "#" means "subtract") and require careful substitution before solving the resulting expression.

2.4 Inequality and Syllogism

Inequality reasoning (e.g., "A > B ≥ C > D") requires combining relational statements logically to determine which conclusions necessarily follow. Syllogisms test logical deduction from categorical statements ("All A are B," "Some A are B," etc.), best verified using Venn diagrams.

2.5 Practice Set — Reasoning Ability (16 MCQs)

1. Seating arrangement puzzles are best solved by:
   (a) Guessing randomly (b) Systematically diagramming clues and eliminating impossible arrangements (c) Ignoring negative clues (d) Solving only the first clue
2. If A is B's father and B is C's mother, then A is C's:
   (a) Uncle (b) Grandfather (c) Brother (d) Cousin
3. A man walks 6 km south, then turns left and walks 8 km. How far is he from his starting point?
   (a) 8 km (b) 10 km (c) 12 km (d) 14 km
4. If in a code, PEN is written as QFO (each letter shifted forward by 1), how is BOOK written?
   (a) CPPL (b) CPPM (c) DPPL (d) CQQL
5. If "@" means "add," "#" means "subtract," and "$" means "multiply," what is the value of 6 @ 4 # 2 $ 3?
   (a) 4 (b) 10 (c) 16 (d) 22
6. Given: A > B ≥ C > D. Which of the following must be true?
   (a) A > D (b) D > A (c) B < D (d) C > A
7. Given: "All roses are flowers. Some flowers fade quickly." Which conclusion necessarily follows?
   (a) All roses fade quickly (b) Some flowers are roses (c) No definite conclusion about roses fading can be drawn from these two statements alone (d) No roses are flowers
8. In the series 2, 5, 11, 23, ?, what is the next term (pattern: ×2+1)?
   (a) 45 (b) 46 (c) 47 (d) 48
9. Pointing to a photograph, a man says, "She is my father's mother." How is the woman related to the man?
   (a) Mother (b) Grandmother (c) Aunt (d) Sister
10. In order and ranking, if a student ranks 15th from the top in a class of 40, their rank from the bottom is:
    (a) 24th (b) 25th (c) 26th (d) 27th
11. In the letter series Z, X, U, Q, ?, what is the next letter?
    (a) L (b) M (c) N (d) K
12. Data Sufficiency questions primarily test whether:
    (a) The given data is grammatically correct (b) The given data is sufficient to answer a question (c) The question has no answer (d) Only calculation speed
13. In a box-based puzzle (floors of a building), if the topmost floor is floor 10 and a person lives 3 floors below the top, they live on floor:
    (a) 6 (b) 7 (c) 8 (d) 13
14. Symbolic operation questions primarily require candidates to:
    (a) Ignore the redefined symbols and use standard meanings (b) Carefully substitute the redefined symbols before solving (c) Assume all symbols mean addition (d) Skip such questions entirely
15. Inequality reasoning conclusions are considered valid only if they:
    (a) Necessarily follow from the given statements under all interpretations (b) Are merely plausible (c) Contradict the given statements (d) Require additional unstated assumptions
16. Venn diagrams are a particularly useful tool for solving:
    (a) Only numerical simplification (b) Syllogism-type logical deduction problems (c) Only direction sense problems (d) Only coding-decoding problems

Answer Key

1.(b)

2.(b)

3.(b)

4.(a)

5.(b)

6.(a)

7.(c)

8.(c)

9.(b)

10.(c)

11.(a)

12.(b)

13.(b)

14.(b)

15.(a) 16.(b)