Preparation guide
NTPC Aptitude Questions
Overview
This page has NTPC aptitude questions with full solutions - numerical ability, verbal, and logical reasoning - in the style students report for the NTPC Online Assessment. Start with the timed mock quiz, then work the solved set and log every miss by topic.
NTPC Aptitude Mock Quiz
Timed placement-style MCQs with score and explanations after you submit. Use it to check speed and accuracy before the real test.
Questions15
Time10 min
Quantitative
If the price of a commodity increases by 25% and then decreases by 20%, what is the net change in price?
Correct answer: No change (0%)
Quantitative
The compound interest on ₹2,000 at 10% p.a. for 2 years (annual compounding) is:
Amount = 2000×1.1² = 2420 → CI = 420.
Quantitative
A game: Win $100 with 30% probability, lose $50 with 70% probability. Expected value?
Correct answer: 0.3 × 100 + 0.7 × (-50) = 30 - 35 = -$5
Reasoning
A walks 10m North, turns right walks 5m, turns right walks 10m. Direction from start?
Correct answer: East (5m east of starting point)
Quantitative
Which of the following is a common protocol used for secure communication over the internet?
HTTPS (HyperText Transfer Protocol Secure) is the secure version of HTTP and is used for secure communication over the internet. It uses SSL/TLS encryption.
Verbal
Synonym of "Scarce":
Scarce means rare or insufficient.
Reasoning
If all roses are flowers and some flowers are red, which statement is definitely true?
Correct answer: Some red things are flowers
Quantitative
Compound interest on ₹1000 at 10% for 2 years (annual compounding):
1000×1.1² − 1000 = 210.
Verbal
There _____ many books on the table.
Many books → plural.
Reasoning
If letter positions are summed (A=1…Z=26), PEN equals:
Sum of positions = 35.
Verbal
Antonym of "Benevolent":
Benevolent ↔ malevolent.
Quantitative
Pointing to a man, a woman said, "His mother is the only daughter of my mother." How is the woman related to the man?
Let's break down the statement: - "His mother" = the man's mother - "only daughter of my mother" = the woman herself (since she's the only daughter) So: The man's mother = the woman Therefore, the woman is the mother of the man.
Reasoning
If every letter is shifted +2 in the alphabet, CODE becomes:
Each letter +2 → EQFG.
Verbal
Antonym of "Optimistic":
Optimistic ↔ pessimistic.
Reasoning
Find the missing number: 3, 9, 27, 81, ?
Each ×3 → 243.
Your score
0/15(0%)
Review
NTPC aptitude topics students usually practice
- Numerical / quantitative: percentages, profit and loss, ratios, time and work, averages, SI/CI, speed-distance
- Logical reasoning: series, coding-decoding, blood relations, seating, syllogisms
- Verbal ability: grammar, vocabulary, error spotting, idioms
Numerical ability questions
Q1: Consecutive integers
Problem: If the sum of three consecutive integers is 72, what is the smallest of these integers?
Solution: Let the integers be x, x+1, and x+2.
x + (x+1) + (x+2) = 72 3x + 3 = 72 3x = 69 x = 23
So the integers are 23, 24, and 25.
Answer: 23
Q2: Distance from speed
Problem: A vehicle travels at 60 km/h for 2.5 hours. How far does it go?
Solution: Distance = speed × time = 60 × 2.5 = 150 km.
Answer: 150 km
Q3: Relative speed trains
Problem: Two trains 120 m and 180 m long run at 40 and 50 km/h in opposite directions. Time to cross?
Solution: Relative speed = 90 km/h = 25 m/s. Distance = 300 m. Time = 12 s.
Answer: 12 seconds
Q4: Sum of naturals
Problem: What is the sum of the first 50 natural numbers?
Solution: Sum of first n naturals = n(n+1)/2. For n = 50: 50 × 51 / 2 = 1275.
Answer: 1275
Q5: Mixture milk
Problem: A mixture has milk and water in the ratio 4:1. If 5 litres of water are added to 20 litres of mixture, what is the new milk:water ratio?
Solution: In 20 L: milk = 16 L, water = 4 L. After adding 5 L water: milk 16, water 9. Ratio = 16:9.
Answer: 16:9
Q6: Pipe empty
Problem: A pipe fills in 8 hours; a leak empties in 12. Time to fill with both open?
Solution: Rate = 1/8 − 1/12 = 1/24. Time = 24 hours.
Answer: 24 hours
Q7: Age ratio
Problem: The ratio of ages of A and B is 3:5. After 8 years the ratio becomes 5:7. Find A’s present age.
Solution: Let ages be 3x and 5x. (3x+8)/(5x+8) = 5/7 7(3x+8) = 5(5x+8) 21x + 56 = 25x + 40 4x = 16 → x = 4 A’s age = 12 years.
Answer: 12 years
Q8: Ratio mixture tea
Problem: Tea worth ₹120/kg is mixed with tea worth ₹180/kg in the ratio 3:2. Find the price of the mixture per kg.
Solution: Price = (3×120 + 2×180) / 5 = (360 + 360) / 5 = 720/5 = ₹144 per kg.
Answer: ₹144
Q9: Unitary rice
Problem: 12 kg rice costs ₹540. Cost of 8 kg?
Solution: Per kg = 45. 8 kg = ₹360.
Answer: ₹360
Q10: Average after replace
Problem: The average of five numbers is 20. One number 30 is replaced by 10. What is the new average?
Solution: Old sum = 5 × 20 = 100. New sum = 100 − 30 + 10 = 80. New average = 80 / 5 = 16.
Answer: 16
Verbal ability questions
Q11: Synonym - resilient
Problem: Best synonym of ‘resilient’?
Solution: Able to recover quickly → tough / flexible.
Answer: Tough / adaptable
Q12: Synonym - obsolete
Problem: Choose the best synonym of ‘obsolete’.
Solution: ‘Obsolete’ means no longer in use. Closest: outdated.
Answer: Outdated
Q13: Antonym - verbose
Problem: Best antonym of ‘verbose’?
Solution: Verbose = wordy. Opposite: concise.
Answer: Concise
Q14: Phrase - by and large
Problem: Meaning of ‘by and large’?
Solution: Generally / on the whole.
Answer: Generally
Q15: Synonym - abundant
Problem: Choose the best synonym of ‘abundant’.
Solution: ‘Abundant’ means present in large quantity. Closest match: plentiful.
Answer: Plentiful
Q16: Synonym - mitigate
Problem: Choose the best synonym of ‘mitigate’.
Solution: ‘Mitigate’ means to make less severe. Closest match: alleviate.
Answer: Alleviate
Reasoning ability questions
Q17: Analogy
Problem: Book is to Reading as Fork is to ?
Solution: A book is used for reading; a fork is used for eating.
Answer: Eating
Q18: Coding letter shift
Problem: If CAT is coded as DBU, how is DOG coded in the same way?
Solution: Each letter moves +1 in the alphabet: C→D, A→B, T→U. D→E, O→P, G→H → EPH.
Answer: EPH
Q19: Mirror clock
Problem: A clock shows 3:15. What is the mirror image time approximately (12-hour mirror)?
Solution: Mirror of h:m is roughly 12:00 − 3:15 → 8:45.
Answer: 8:45
Q20: Seating circular
Problem: Four people sit around a square table facing center. A sits opposite C. If B is left of A, who is right of C?
Solution: Opposite pairs A-C. B left of A means clockwise B. Right of C is B.
Answer: B
Q21: Number series gap
Problem: Find the missing number: 5, 11, 23, 47, ?
Solution: ×2+1 pattern: 5→11→23→47→95.
Answer: 95
Q22: Coding opposite
Problem: If ROAD is coded as URDG, how is RACE coded?
Solution: Each letter +3: R→U, O→R, A→D, D→G. R→U, A→D, C→F, E→H → UDFH.
Answer: UDFH
Timed practice tips for NTPC
- First pass: only high-confidence questions
- Mark and skip time sinks early
- Keep verbal accuracy high - these are easy marks if you stay calm
- Run the mock quiz at least three times a week under real timing
- Sleep properly the night before; fatigue hurts DI and calculation accuracy