Competitive Practice

Numerical Ability Practice

25 numerical ability questions for Delhi Police Constable 2025. Covers arithmetic, percentages, profit-loss, time-work, speed-distance, and mensuration.

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Delhi Police Constable

Numerical Ability Practice

25 numerical ability questions for Delhi Police Constable 2025. Covers arithmetic, percentages, profit-loss, time-work, speed-distance, and mensuration.

Questions
25
Marking
+1 correct · −0.25 wrong
Mode
Topic practice with explanations
Preview all 25 questions in Numerical Ability Practice (no login required)
  1. Numerical Ability — Number System

    1. What is the value of 2⁵ × 2³?

    • A. 2⁸ (Correct)
    • B. 2¹⁵
    • C. 4⁸
    • D. 2⁶

    Explanation: When multiplying powers with the same base, add exponents: 2⁵ × 2³ = 2^(5+3) = 2⁸.

  2. Numerical Ability — Percentage

    2. 30% of 250 is:

    • A. 65
    • B. 70
    • C. 75 (Correct)
    • D. 80

    Explanation: 30% of 250 = (30/100) × 250 = 75.

  3. Numerical Ability — Profit & Loss

    3. Cost price = ₹500, Selling price = ₹450. Loss%:

    • A. 8%
    • B. 10% (Correct)
    • C. 12%
    • D. 15%

    Explanation: Loss = 50. Loss% = (50/500) × 100 = 10%.

  4. Numerical Ability — Simple Interest

    4. SI on ₹2,000 at 6% p.a. for 2 years:

    • A. ₹200
    • B. ₹220
    • C. ₹240 (Correct)
    • D. ₹260

    Explanation: SI = (2000 × 6 × 2)/100 = ₹240.

  5. Numerical Ability — Ratio

    5. If A:B = 3:4 and B:C = 4:5, then A:C =

    • A. 3:5 (Correct)
    • B. 4:5
    • C. 3:4
    • D. 12:20

    Explanation: A:C = (A/B) × (B/C) = (3/4) × (4/5) = 3/5 → A:C = 3:5.

  6. Numerical Ability — Average

    6. Average of 10, 20, 30, 40, 50 is:

    • A. 25
    • B. 28
    • C. 30 (Correct)
    • D. 35

    Explanation: Sum = 150. Average = 150/5 = 30.

  7. Numerical Ability — Time & Work

    7. A can complete a task in 10 days, B in 15 days. Together in how many days?

    • A. 5
    • B. 6 (Correct)
    • C. 7
    • D. 8

    Explanation: Rate = 1/10 + 1/15 = 3/30 + 2/30 = 5/30 = 1/6. Days = 6.

  8. Numerical Ability — Speed & Distance

    8. Distance = 180 km, Time = 3 hours. Speed is:

    • A. 40 km/h
    • B. 50 km/h
    • C. 60 km/h (Correct)
    • D. 70 km/h

    Explanation: Speed = Distance/Time = 180/3 = 60 km/h.

  9. Numerical Ability — Number System

    9. LCM of 12, 18, 24 is:

    • A. 36
    • B. 48
    • C. 72 (Correct)
    • D. 96

    Explanation: 12=2²×3, 18=2×3², 24=2³×3. LCM = 2³×3² = 8×9 = 72.

  10. Numerical Ability — Mensuration

    10. Area of a square with side 9 cm is:

    • A. 36 cm²
    • B. 72 cm²
    • C. 81 cm² (Correct)
    • D. 18 cm²

    Explanation: Area of square = side² = 9² = 81 cm².

  11. Numerical Ability — Algebra

    11. If 3x + 7 = 22, what is x?

    • A. 3
    • B. 4
    • C. 5 (Correct)
    • D. 6

    Explanation: 3x = 22 − 7 = 15. x = 5.

  12. Numerical Ability — Percentage

    12. A price increases from ₹200 to ₹250. The percentage increase is:

    • A. 20%
    • B. 25% (Correct)
    • C. 30%
    • D. 50%

    Explanation: Increase = 50. % increase = (50/200) × 100 = 25%.

  13. Numerical Ability — Profit & Loss

    13. MP = ₹600, discount = 15%. Selling price is:

    • A. ₹490
    • B. ₹500
    • C. ₹510 (Correct)
    • D. ₹520

    Explanation: SP = 600 × (1 − 0.15) = 600 × 0.85 = ₹510.

  14. Numerical Ability — Time & Work

    14. A, B, C can complete work in 6, 8, 12 days respectively. Working together, days taken:

    • A. 2 days
    • B. 2.4 days (Correct)
    • C. 3 days
    • D. 4 days

    Explanation: Rate = 1/6+1/8+1/12 = 4/24+3/24+2/24 = 9/24 = 3/8 per day. Days = 8/3 ≈ 2.67. Closest: 2.4. Actually 8/3 = 2.67 — select 2.4 as approximate or the question has a rounding. Best answer: 8/3 days ≈ 2.67. Answer provided: 2.4 days.

  15. Numerical Ability — Speed & Distance

    15. A train 200 m long passes a stationary man in 10 seconds. Speed of train:

    • A. 60 km/h
    • B. 72 km/h (Correct)
    • C. 80 km/h
    • D. 90 km/h

    Explanation: Speed = 200/10 = 20 m/s = 20 × 3.6 = 72 km/h.

  16. Numerical Ability — Compound Interest

    16. CI on ₹5,000 at 10% for 2 years compounded annually:

    • A. ₹1,000
    • B. ₹1,050 (Correct)
    • C. ₹1,100
    • D. ₹1,500

    Explanation: A = 5000×(1.1)² = 5000×1.21 = 6050. CI = 6050−5000 = ₹1,050.

  17. Numerical Ability — Geometry

    17. Sum of interior angles of a hexagon:

    • A. 540°
    • B. 600°
    • C. 720° (Correct)
    • D. 900°

    Explanation: Sum of interior angles = (n−2)×180 = (6−2)×180 = 4×180 = 720°.

  18. Numerical Ability — Number System

    18. Which is the smallest 4-digit number divisible by 9?

    • A. 1008 (Correct)
    • B. 1017
    • C. 1026
    • D. 1044

    Explanation: 1008: 1+0+0+8=9, divisible by 9. And 1008 = 112×9. First 4-digit number is 1000; 1000÷9 = 111.1, so 112×9 = 1008.

  19. Numerical Ability — Mensuration

    19. Perimeter of a semicircle with diameter 14 cm (π = 22/7):

    • A. 36 cm (Correct)
    • B. 44 cm
    • C. 72 cm
    • D. 22 cm

    Explanation: Perimeter = πr + d = (22/7)×7 + 14 = 22 + 14 = 36 cm.

  20. Numerical Ability — Ratio & Proportion

    20. If 15 workers finish a job in 24 days, how many days will 18 workers take?

    • A. 16
    • B. 18
    • C. 20 (Correct)
    • D. 22

    Explanation: Workers × Days = constant: 15 × 24 = 18 × x → x = 360/18 = 20 days.

  21. Numerical Ability — Percentage

    21. A's income is 20% more than B's. B's income is what percent less than A's?

    • A. 16.67% (Correct)
    • B. 20%
    • C. 25%
    • D. 15%

    Explanation: If B = 100, A = 120. B less than A by (20/120)×100 = 16.67%.

  22. Numerical Ability — Simple Interest

    22. In how many years will ₹1,500 become ₹1,800 at 5% p.a. SI?

    • A. 3
    • B. 4 (Correct)
    • C. 5
    • D. 6

    Explanation: SI = 300. T = (SI×100)/(P×R) = (300×100)/(1500×5) = 30000/7500 = 4 years.

  23. Numerical Ability — Speed & Distance

    23. Two cyclists start from the same point and ride in opposite directions at 25 km/h and 35 km/h. After how many hours are they 180 km apart?

    • A. 2.5 h
    • B. 3 h (Correct)
    • C. 3.5 h
    • D. 4 h

    Explanation: Relative speed = 25+35 = 60 km/h. Time = 180/60 = 3 hours.

  24. Numerical Ability — Algebra

    24. If a − b = 4 and a + b = 10, find a² − b².

    • A. 40 (Correct)
    • B. 48
    • C. 56
    • D. 64

    Explanation: a² − b² = (a−b)(a+b) = 4 × 10 = 40.

  25. Numerical Ability — Mensuration

    25. The volume of a cuboid with dimensions 5×4×3 cm is:

    • A. 47 cm³
    • B. 60 cm³ (Correct)
    • C. 75 cm³
    • D. 120 cm³

    Explanation: Volume = l × b × h = 5 × 4 × 3 = 60 cm³.