TCS NQT Reasoning Ability Questions
Reasoning Ability Overview
Key Topics
| Topic | Frequency | Difficulty | Typical Questions |
|---|---|---|---|
| Number Series | Very High | Easy-Medium | 1-2 questions, find next/missing number |
| Coding-Decoding | Very High | Medium | 1-2 questions, letter/number substitution |
| Blood Relations | High | Medium | 1-2 questions, family tree relationships |
| Seating Arrangements | High | Medium-Hard | 3-4 questions from one set, linear/circular |
| Syllogisms | Medium | Medium | 1-2 questions, logical deductions from statements |
| Direction Sense | Medium | Easy-Medium | 1 question, compass directions and distances |
| Logical Puzzles | Medium | Hard | 3-4 questions from one set, multi-parameter grouping |
| Analogy & Classification | Low-Medium | Easy | 1-2 questions, odd one out or pair matching |
Approach for Each Topic
- •Number Series: Check differences between consecutive terms first. If differences aren't constant, check differences of differences (second-order). Also look for alternating patterns or multiplication-based series.
- •Coding-Decoding: Map each letter to its position (A=1, B=2...Z=26). Look for consistent shifts, reversals, or position-based patterns. Test your hypothesis on multiple letter pairs.
- •Blood Relations: Always draw a family tree diagram. Use symbols: + for male, - for female, horizontal line for marriage, vertical for parent-child. Work from the most concrete statement first.
- •Seating Arrangements: Draw the arrangement (line or circle) immediately. Place the most constrained person first. Use definite clues before conditional ones.
- •Syllogisms: Use Venn diagrams. Draw circles for each category. "All A are B" means A's circle is inside B's. "Some A are B" means the circles overlap. Test each conclusion against your diagram.
- •Direction Sense: Draw a compass rose on your rough sheet. Trace the path step by step. Remember: right turns from North go East, from East go South, etc.
Common Traps to Avoid
- •In blood relations, "mother's only son" means the person themselves if they're male — don't assume a separate person
- •In seating arrangements, "immediately left" in circular arrangement depends on whether you're facing the center or facing outward
- •In number series, don't assume the pattern is always addition — check for multiplication, squares, cubes, or alternating operations
- •In coding-decoding, the same word might be encoded differently in different examples if the rule involves position
- •In syllogisms, "Some A are B" does NOT mean "Some A are not B" — both can be true simultaneously
Seating arrangement and puzzle sets typically have 3-4 linked questions. If you get the arrangement wrong, you'll lose all linked questions. Spend extra time verifying your setup before answering.
Sample Questions
Sample Questions
Find the next number in the series: 3, 8, 15, 24, 35, ?
In a certain coding system, "CLOUD" is coded as "DMPVE" and "STORM" is coded as "TUPSN." Using the same coding pattern, how would "BYTES" be coded?
Six people — P, Q, R, S, T, and U — are seated in a row facing north. The following conditions apply: 1. R sits third from the left end. 2. T is not adjacent to R. 3. Q sits immediately to the right of P. 4. S sits at the left end. 5. U is not at any extreme end. Who sits at the rightmost position?
Want more practice questions?
Sign up for full access to hundreds of practice questions with detailed solutions.
Start PracticingReady to Test Yourself?
Take a full-length mock test with real exam conditions, timed sections, and AI-powered performance analysis.
Starting at ₹295