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Arithmetical & Numerical Ability — Practice MCQs (DSSSB Section A)

30 original questions. Choose the best option.


1. 25% of 480 is:

  • A) 100
  • B) 120
  • C) 140
  • D) 160

2. Simplify: 15 ÷ 3 × 2 + 4 = ?

  • A) 10
  • B) 14
  • C) 6
  • D) 18

3. Ratio 3 : 5 = ? if first part of 40 is taken in that ratio of a sum split into 3+5 parts:

  • A) 15
  • B) 25
  • C) 12
  • D) 20

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

  • A) 25
  • B) 30
  • C) 35
  • D) 40

5. A shopkeeper buys at ₹80 and sells at ₹100. Profit % is:

  • A) 20%
  • B) 25%
  • C) 15%
  • D) 30%

6. SI on ₹2000 at 10% p.a. for 2 years is:

  • A) ₹200
  • B) ₹400
  • C) ₹300
  • D) ₹450

7. CI on ₹1000 at 10% p.a. for 2 years (annual) is:

  • A) ₹200
  • B) ₹210
  • C) ₹220
  • D) ₹100

8. A can do a work in 10 days, B in 15 days. Together they finish in:

  • A) 6 days
  • B) 8 days
  • C) 5 days
  • D) 12 days

9. Speed 60 km/h for 2.5 hours covers:

  • A) 120 km
  • B) 150 km
  • C) 100 km
  • D) 180 km

10. HCF of 12 and 18 is:

  • A) 2
  • B) 3
  • C) 6
  • D) 9

11. LCM of 4 and 6 is:

  • A) 12
  • B) 24
  • C) 10
  • D) 8

12. 0.25 as a fraction in lowest terms is:

  • A) 1/2
  • B) 1/4
  • C) 1/5
  • D) 2/5

13. If cost price is ₹250 and loss is 10%, SP is:

  • A) ₹225
  • B) ₹240
  • C) ₹200
  • D) ₹275

14. A train 120 m long running at 54 km/h crosses a pole in:

  • A) 6 s
  • B) 8 s
  • C) 10 s
  • D) 12 s

15. 3/4 of 240 is:

  • A) 160
  • B) 180
  • C) 200
  • D) 120

16. The next number in 2, 5, 10, 17, 26, ? is:

  • A) 35
  • B) 37
  • C) 40
  • D) 36

17. If x : y = 2 : 3 and x + y = 50, then x is:

  • A) 20
  • B) 30
  • C) 25
  • D) 15

18. Square of 15 is:

  • A) 215
  • B) 225
  • C) 235
  • D) 245

19. √144 = ?

  • A) 10
  • B) 11
  • C) 12
  • D) 14

20. 40% of a number is 80. The number is:

  • A) 160
  • B) 200
  • C) 180
  • D) 220

21. Pipe A fills a tank in 6 h, B in 8 h. Together they fill in:

  • A) 24/7 h
  • B) 3 h
  • C) 4 h
  • D) 7 h

22. Difference between SI and CI on ₹1000 for 2 years at 10% is:

  • A) ₹5
  • B) ₹10
  • C) ₹15
  • D) ₹20

23. A sum doubles in 5 years at SI. Rate % p.a. is:

  • A) 10%
  • B) 15%
  • C) 20%
  • D) 25%

24. Average of first 5 odd numbers is:

  • A) 3
  • B) 5
  • C) 7
  • D) 9

25. 2.5 × 1.2 = ?

  • A) 2.0
  • B) 3.0
  • C) 3.5
  • D) 4.0

26. If 12 men do a job in 10 days, 8 men will take:

  • A) 12 days
  • B) 15 days
  • C) 18 days
  • D) 20 days

27. Selling price for 20% profit on CP ₹500 is:

  • A) ₹550
  • B) ₹600
  • C) ₹650
  • D) ₹700

28. Area of a rectangle 8 m × 5 m is:

  • A) 13 m²
  • B) 26 m²
  • C) 40 m²
  • D) 45 m²

29. Perimeter of a square of side 9 cm is:

  • A) 18 cm
  • B) 27 cm
  • C) 36 cm
  • D) 81 cm

30. Which is the largest?

  • A) 3/4
  • B) 5/8
  • C) 7/10
  • D) 2/3

Answer Key

  1. B — 0.25 × 480 = 120.
  2. B — 5 × 2 + 4 = 14.
  3. A — 3/(3+5)×40 = 15.
  4. B — Sum 150 / 5 = 30.
  5. B — Profit 20 on 80 → 25%.
  6. B — SI = 2000×10×2/100 = 400.
  7. B — Amount 1210 → CI = 210.
  8. A — 1/10+1/15 = 1/6 → 6 days.
  9. B — 60 × 2.5 = 150 km.
  10. C — HCF(12,18) = 6.
  11. A — LCM(4,6) = 12.
  12. B — 0.25 = 1/4.
  13. A — SP = 90% of 250 = 225.
  14. B — 54 km/h = 15 m/s; t = 120/15 = 8 s.
  15. B — (3/4)×240 = 180.
  16. B — +3,+5,+7,+9,+11 → 37.
  17. A — x = (2/5)×50 = 20.
  18. B — 15² = 225.
  19. C — √144 = 12.
  20. B — Number = 80/0.4 = 200.
  21. A — 1/6+1/8 = 7/24 → 24/7 h.
  22. B — CI−SI = P(r/100)² = 10.
  23. C — 100 = r×5 ⇒ r = 20%.
  24. B — (1+3+5+7+9)/5 = 5.
  25. B — 2.5 × 1.2 = 3.0.
  26. B — Men×days constant: 12×10 = 8×d ⇒ d = 15.
  27. B — SP = 500 × 1.2 = 600.
  28. C — 8 × 5 = 40.
  29. C — 4 × 9 = 36.
  30. A — 0.75 > 0.7 > 0.666… > 0.625.