If the radius of a circle is increased by 100%, the area increases by: MCQ with Answer and Explanation

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If the radius of a circle is increased by 100%, the area increases by:

A. 400%

B. 300%

C. 200%

D. 500%

Answer: Option B

Solution (By JKSSB Mock Tests)

Area proportional to radius². New radius 2r, area 4 times, increase = 300% (i.e., 4-1 = 3 times = 300%).

This question belongs to: Maths Percentage

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Practice More Percentage Questions

Question #1

What percent of 500 is 125?

A. 22.5%

B. 20%

C. 25%

D. 30%

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Correct Answer: Option C

Explanation:
(125/500)×100 = 25%.

This question belongs to: Maths Percentage

Question #2

In an election, 20% voters did not vote. Winner got 48% of total votes and won by 2000 votes. Total voters:

A. 12500

B. 10000

C. 12000

D. 15000

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Correct Answer: Option A

Explanation:
Let total T. Votes cast = 0.8T. Winner got 0.48T, loser 0.8T - 0.48T = 0.32T. Margin = 0.48T - 0.32T = 0.16T = 2000 → T = 12500.

This question belongs to: Maths Percentage

Question #3

A number is increased by 25% and then the result is decreased by 25%. If the final number is 75, find the original number.

A. 70

B. 75

C. 80

D. 85

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Correct Answer: Option C

Explanation:
1.25 × 0.75 = 0.9375, 0.9375x = 75 → x = 80.

This question belongs to: Maths Percentage

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