Radius of a circle increased by 100%. Percentage increase in area: MCQ with Answer and Explanation

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Radius of a circle increased by 100%. Percentage increase in area:

A. 200%

B. 300%

C. 100%

D. 400%

Answer: Option B

Solution (By JKSSB Mock Tests)

Area proportional to radius². New radius 2r, area 4 times, increase = 300%.

This question belongs to: Maths Percentage

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Question #1

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A student scored 42% marks and failed by 12 marks. Another student scored 58% marks and got 20 marks more than the passing marks. Find the maximum marks.

A. 160

B. 200

C. 220

D. 180

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Correct Answer: Option B

Explanation:
0.42M + 12 = 0.58M - 20 → 32 = 0.16M → M = 200.

This question belongs to: Maths Percentage

Question #2

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Two numbers are 25% and 40% more than a third number. Their ratio is:

A. 25:28

B. 5:7

C. 5:6

D. 15:17

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Correct Answer: Option A

Explanation:
Third = 100, first = 125, second = 140, ratio = 125:140 = 25:28.

This question belongs to: Maths Percentage

Question #3

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A mixture contains 25% alcohol. In 80 litres, amount of alcohol is:

A. 20 L

B. 22 L

C. 16 L

D. 18 L

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Correct Answer: Option A

Explanation:
25% of 80 = 20 litres.

This question belongs to: Maths Percentage

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