Selected MCQ

Current Question
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 1
If the side of a square is increased by 25%, then its area increases by ____.
  • A. 25%
  • B. 55%
  • C. 40.5%
  • D. 56.25%
Correct Answer: D
Explanation:
Area change = (1.25)² = 1.5625 → 56.25% increase.
Related Question 2
Side of square increases by 25%. Increase in area is ____.
  • A. 52.65%
  • B. 56.25%
  • C. 50.75%
  • D. 42.75%
Correct Answer: B
Explanation:
Area ∝ side² → (1.25)².
Related Question 3
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 4
Total area of 64 squares is 400 cm². Find the side of the big square.
  • A. 17 cm
  • B. 20 cm
  • C. 23 cm
  • D. 26 cm
Correct Answer: D
Explanation:
Total side calculation.
Related Question 5
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%.