Selected MCQ

Current Question
If the radius of a circle is halved, area becomes ____.
  • A. Half
  • B. One-fourth
  • C. Same
  • D. Double
Correct Answer: B
Explanation:
Area ∝ r² → becomes 1/4.
Related Question 1
If the radius of a circle is doubled, area becomes ____.
  • A. Double
  • B. Four times
  • C. Same
  • D. Half
Correct Answer: B
Explanation:
Area ∝ r² → becomes 4 times.
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 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
If the length of a rectangle is doubled and breadth halved, the area becomes ____.
  • A. Double
  • B. Half
  • C. Same
  • D. Four times
Correct Answer: C
Explanation:
(2L × B/2) = LB.
Related Question 5
The area of a circle with radius 7 cm is ____.
  • A. 154
  • B. 144
  • C. 132
  • D. 120
Correct Answer: A
Explanation:
πr² = 154.