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