Selected MCQ

Current Question
If 20 teachers out of 80 are transferred, what percentage remains?
  • A. 4%
  • B. 16%
  • C. 60%
  • D. 75%
Correct Answer: D
Explanation:
Remaining = 60/80 = 75%.
Related Question 1
Profit is 320% of cost. If cost increases by 25% but SP remains the same, the new profit percentage is ____.
  • A. 30%
  • B. 70%
  • C. 100%
  • D. 250%
Correct Answer: B
Explanation:
Adjusted profit reduces to 70%.
Related Question 2
If radius becomes one-third but volume remains constant, length changes by ____.
  • A. 1 time
  • B. 3 times
  • C. 6 times
  • D. 9 times
Correct Answer: D
Explanation:
Volume constant → length ∝ 1/r².
Related Question 3
The population of a town increased from 175000 to 262500 in 10 years. Find the average annual percentage increase.
  • A. 4.37%
  • B. 5%
  • C. 6%
  • D. 8.75%
Correct Answer: B
Explanation:
Using the compound growth formula gives ≈ 5% annually.
Related Question 4
In two years, 100 and 75 students appeared. Pass percentages were 75% and 60%. Overall pass % is ____.
  • A. 68 4/7 %
  • B. 78%
  • C. 80%
  • D. 80 4/7%
Correct Answer: A
Explanation:
The weighted average is 68 4/7%.
Related Question 5
If errors of 5% and 3% are made in measuring the sides of a rectangle, what is the percentage error in the area?
  • A. 8.35%
  • B. 7.15%
  • C. 8.15%
  • D. 6.25%
Correct Answer: C
Explanation:
Total error ≈ 5 + 3 + (5×3)/100 = 8.15%.