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

Question

Share Report Error

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

A. 300%

B. 500%

C. 200%

D. 400%

Answer: Option A

Solution (By JKExamLibrary)

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

Request complete Subject PDF

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Percentage Questions

Question #1

Two numbers are 20% and 30% more than a third. Ratio of the two numbers:

A. 13:14

B. 11:12

C. 10:11

D. 12:13

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Third=100, first=120, second=130, ratio 120:130 = 12:13.

This question belongs to: Maths Percentage

Question #2

By what percent is 120 less than 150?

A. 18%

B. 15%

C. 25%

D. 20%

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option D

Explanation:
Difference = 30, % = (30/150)×100 = 20%.

This question belongs to: Maths Percentage

Question #3

Gave 20% to wife, 25% of remainder to son, rest to daughter. Daughter got Rs. 6000, total:

A. 10000

B. 15000

C. 12000

D. 8000

View Answer & Solution Discuss

Get Complete Subject PDF for Maths

Correct Answer: Option A

Explanation:
Wife 20%, left 80%, son 25% of 80%=20%, daughter 60%=6000 → total=10000.

This question belongs to: Maths Percentage

Explore All Percentage MCQs