Selected MCQ

Current Question
The radius of a circle is increased by 1%. By what percent does its area increase?
  • A. 1.01%
  • B. 5.01%
  • C. 3.01%
  • D. 2.01%
Correct Answer: D
Explanation:
Area ∝ r² → increase ≈ 2.01%.
Related Question 1
If the side of a square is increased by 25%, by what percent does its area increase?
  • A. 25%
  • B. 40%
  • C. 50%
  • D. 56.25%
Correct Answer: D
Explanation:
Area increases by (1.25)² − 1 = 56.25%.
Related Question 2
Two circles have a radius relation. Area of the square is 196 cm². Find radius.
  • A. 12π
  • B. 16π
  • C. 24π
  • D. 32π
Correct Answer: C
Explanation:
Side=14, radius=7×? → area relation.
Related Question 3
The price of petrol has increased by 25%. By what percent should consumption be reduced to keep expenditure constant?
  • A. 25%
  • B. 30%
  • C. 50%
  • D. 20%
Correct Answer: D
Explanation:
Reduction = 25/125 ×100 = 20%.
Related Question 4
The price of an article is reduced by 25%. By what percent should it be increased to restore the original price?
  • A. 33 1/3 %
  • B. 11 1/9 %
  • C. 9 1/11 %
  • D. 66 2/3 %
Correct Answer: A
Explanation:
Required increase = 25/75 ×100 = 33 1/3%.
Related Question 5
The price of an item is increased by 15%. By what percent must consumption be reduced to keep expenditure constant?
  • A. 10 20/23 %
  • B. 13 1/23 %
  • C. 16 2/3 %
  • D. 15 %
Correct Answer: B
Explanation:
Reduction = 15/115 ×100 = 13 1/23%.