Maths MCQs for AD (ASF)
Q11. The mean proportional between 16 and 81 is
- A) 24
- B) 30
- C) 36
- D) None of these
Answer: C
Mean proportional = √(16×81) = √1296 = 36.
Q12. A number when divided by 12 leaves remainder 5. What remainder will it leave when divided by 3?
- A) 0
- B) 1
- C) 2
- D) None of these
Answer: C
12k+5 divided by 3 leaves remainder 2.
Q13. The product of two consecutive integers is 156. The larger integer is
- A) 11
- B) 13
- C) 14
- D) None of these
Answer: B
12 × 13 = 156, so larger integer is 13.
Q14. A sum doubles itself in 5 years at simple interest. In how many years will it become four times?
Answer: D
If it doubles in 5 years, interest for 5 years = principal. To become 4 times, interest = 3P, so 15 years.
Q15. If 15 men complete a work in 12 days, how many days will 20 men take?
- A) 8
- B) 10
- C) 9
- D) None of these
Answer: C
Men × days = constant → 15×12 = 20×x ⇒ x = 9.
Q16. A shopkeeper gives 10% discount on Rs 800. The sale price is
- A) 700
- B) 720
- C) 740
- D) None of these
Answer: B
10% of 800 = 80, so sale price = 800 − 80 = 720.
Q17. The HCF of 48 and 72 is
- A) 12
- B) 24
- C) 36
- D) None of these
Answer: B
Highest common factor of 48 and 72 is 24.
Q18. A train 120 m long crosses a pole in 6 seconds. Its speed is
- A) 18 m/s
- B) 20 m/s
- C) 24 m/s
- D) None of these
Answer: B
Speed = distance/time = 120 ÷ 6 = 20 m/s.
Q19. If 3 pencils cost Rs 18, what is the cost of 7 pencils?
- A) 36
- B) 42
- C) 48
- D) None of these
Answer: B
1 pencil = 6, so 7 pencils = 42.
Q20. If x : y = 4 : 5 and y : z = 10 : 3, then x : z =
- A) 2 : 3
- B) 8 : 3
- C) 4 : 3
- D) None of these
Answer: B
x:y = 4:5 = 8:10, and y:z = 10:3, so x:z = 8:3.
