Selected MCQ

Current Question
In a 100 gm alloy of gold and silver, gold is 80% by weight. How much gold is present?
  • A. 200 gm
  • B. 80 gm
  • C. 50 gm
  • D. 10 gm
Correct Answer: B
Explanation:
Gold = 80% of 100 = 80 gm.
Related Question 1
Khadija’s age after 1 year is twice her age 10 years ago. Find the present age.
  • A. 19
  • B. 20
  • C. 21
  • D. 22
Correct Answer: C
Explanation:
Solve Equation.
Related Question 2
Three years ago, the average age of 6 members was 19. Find the present age of a boy.
  • A. 1 year
  • B. 1.5 years
  • C. 2 years
  • D. 2.5 years
Correct Answer: A
Explanation:
Total age difference method.
Related Question 3
Value of the plant depreciates 10% annually. Find the present value after 2 years, given the initial amount.
  • A. Rs. 8000
  • B. Rs. 10000
  • C. Rs. 18000
  • D. Rs. 8100
Correct Answer: D
Explanation:
Value = P(0.9)².
Related Question 4
A lotion contains 50% alcohol. How much water must be added to reduce the alcohol content to 25% in 9 ml?
  • A. 3 ml
  • B. 4 ml
  • C. 5 ml
  • D. 6 ml
Correct Answer: D
Explanation:
Using the dilution Equation yields 6 mL of water.
Related Question 5
The present worth of Rs. 1404 due in two equal half-yearly installments at 8% per annum is ____.
  • A. Rs. 1325
  • B. Rs. 1300
  • C. Rs. 1350
  • D. Rs. 1500
Correct Answer: A
Explanation:
Discounting each installment at 4% yields a present value of Rs. 1325.