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Mastering Aptitude: A Complete Guide with Solved Examples and Practice Exercises for Competitive Exams - Answer Key with Explanations

Section 1: Verbal Ability (18 Questions)

Q1. Answer: B. Access to diverse cultures and opportunities
Explanation: Passage clearly mentions globalization provides access to diverse cultures and opportunities. Other options are challenges, not benefits.

Q2. Answer: B. Economic inequality
Explanation: Passage highlights inequality, loss of cultural identity, and environmental concerns as challenges.

Q3. Answer: B. Adopting a balanced approach
Explanation: The author says “The key lies in adopting a balanced approach.”

Q4. Answer: B. Plentiful
Explanation: Abundant means plentiful in quantity. Opposite of scarce.

Q5. Answer: C. keep
Explanation: Correct phrase is “keep her eyes open.”

Q6. Correct order: A → C → D → B
Explanation: He prepared → studied late at night → results announced → he passed.

Q7. Answer: C. Dull
Explanation: Vivid means bright and clear. Opposite is dull.

Q8. Error: “have” should be “has.”
Correct sentence: “Neither of the boys has completed the homework.”

Q9. Answer: A. since
Explanation: Point of time → “since last June.”

Q10. Answer: B. They go to the park every evening.
Explanation: Subject-verb agreement.

Q11. Answer: A. will have
Explanation: Future perfect tense: “will have started.”

Q12. Answer: C. would have
Explanation: Conditional past → “If he had studied, he would have passed.”

Q13. Answer: B. Clear
Explanation: Transparent = clear, see-through.

Q14. Answer: B. Selfish
Explanation: Opposite of generous is selfish.

Q15. Correction: “She doesn’t know the answer.”

Q16. Answer: B. in
Explanation: Correct usage → “interested in.”

Q17. Answer: A. Calm
Explanation: Serene = calm, peaceful.

Q18. Answer: A. heavy
Explanation: Correct collocation is “heavy rain.”

Section 2: Quantitative Aptitude (20 Questions)

Q19. Answer: B. 50%
Explanation: CP = 200 ÷ 20 = 10 each. SP = 15. Profit = 5. Profit% = 5/10 × 100 = 50%.

Q20. Answer: C. 10%
Explanation: CP = 100. MP = 130. SP = 130 × 0.8 = 104. Profit = 4%. Correction—actual answer = A. 4%.

Q21. Answer: A. 1:3
Explanation: 5x = 15y → x = 3y → ratio = 3:1. Correction—answer is B. 3:1.

Q22. Answer: B. 7.2 days
Explanation: Work rates: A = 1/12, B = 1/18. Together = 5/36 per day. Total = 36/5 = 7.2 days.

Q23. Answer: C. 50 km/h
Explanation: Total distance = 200 km. Time = 5h. Avg = 200 ÷ 5 = 40 km/h. Correction → A. 40 km/h.

Q24. Answer: A. 960
Explanation: SI = PRT/100 = 4000 × 12 × 2 /100 = 960.

Q25. Answer: C. 20%
Explanation: CP = 100. MP = 140. SP = 112. Profit = 12%. Correction → A. 12%.

Q26. Answer: D. 5/12
Explanation: A = 1/15, B = 1/20. Together = 7/60. In 5 days = 35/60 = 7/12 work done. Left = 5/12.

Q27. Answer: B. 460
Explanation: 15% of 400 = 60. SP = 460.

Q28. Answer: C. 24
Explanation: First 7 multiples = 6,12…42. Avg = (1+7)/2 × 6 = 24.

Q29. Answer: B. 8 km/h
Explanation: Distance = 12+10=22. Time=3h. Avg=22/3=7.33 ≈ 7.33 → Option missing. Closest=7 km/h. Correction → A. 7 km/h.

Q30. Answer: B. 60 km/h
Explanation: Total distance=420, time=7h → 60 km/h.

Q31. Answer: B. 24
Explanation: Men×Days = constant. 12×18=216. For 9 days → 216/9=24 men.

Q32. Answer: C. 800
Explanation: SP=720, loss=10%. CP= SP/0.9=800.

Q33. Answer: C. 30
Explanation: Total = 10×20=200. Remaining = 9×19=171. Removed=29. Closest=30.

Q34. Answer: B. 500 m
Explanation: Speed=72 km/h=20 m/s. Distance=20×25=500 m.

Q35. Answer: A. 1200
Explanation: SI=1440–P. P×8×2/100=P×0.16. Equation: P+0.16P=1440→1.16P=1440→P=1241. Closest=1240.

Q36. Answer: A. 25%
Explanation: Profit=150/500=30%. Correction → B. 30%.

Q37. Answer: B. 7 km/h
Explanation: Distance=28, time=4h. Avg=7.

Q38. Answer: B. 72 km/h
Explanation: Distance=500 m. Time=25s. Speed=20m/s=72 km/h.

Section 3: Logical Reasoning (22 Questions)

Q39. Answer: C. Some writers are professionals
Explanation: Some professionals are writers → true.

Q40. Answer: C. C
Explanation: C taller than B, B taller than A.

Q41. Answer: B. 48
Explanation: Multiply by 2 each time.

Q42. Answer: B. Monday
Explanation: 7 days after is same day.

Q43. Answer: B. 25
Explanation: 7+19–1=25.

Q44. Answer: A. All crows fly
Explanation: All birds fly → crows (subset) also fly.

Q45. Answer: D. Mango
Explanation: All others are flowers.

Q46. Answer: D. West
Explanation: East→left=North→left=West.

Q47. Answer: A. Father
Explanation: P is father of Q, Q is sister of R. → P father of both.

Q48. Answer: C. D
Explanation: D is shorter than C, who is shorter than A.

Q49. Answer: C. 160
Explanation: Multiply by 2 each step.

Q50. Answer: C. Some books are copies
Explanation: Given directly.

Q51. Answer: A. 5m East
Explanation: Ends up 5m east of start.

Q52. Answer: C. Some graduates are artists
Explanation: From statement.

Q53. Answer: B. 24
Explanation: 15+10–1=24.

Q54. Answer: B. Uncle
Explanation: A is brother of B, B is mother of C → A is uncle.

Q55. Answer: C. 15
Explanation: Formula n(n–1)/2 = 6×5/2=15.

Q56. Answer: B. 36
Explanation: Perfect squares sequence.

Q57. Answer: B. No actor is immortal
Explanation: All actors humans, no human immortal.

Q58. Answer: B. Circle
Explanation: Only circle has no sides.

Q59. Answer: A. 10m
Explanation: Pythagoras: √(8²+6²)=10.

Q60. Answer: B. 3h
Explanation: Work per hour=1/6+1/8+1/12=11/24. Time=24/11≈2.18h. Closest=2h. Correction → A. 2h.

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