Sphere or cube scaled: area goes as the square, volume as the cube of the length
This type of question, asked 4 times: CDS 1 2017, CDS 2 2019, CDS 2 2020, CDS 1 2023. All 4 questions below, oldest first.
Try each one first, then open its answer.
Question 1
CDS 1 2017
85If the surface area of a sphere is reduced to one-ninth of the area, its radius reduces toTap an option to check your answer.
Question 2
CDS 2 2019
73The volume of a spherical balloon is increased by 700%. What is the percentage increase in its surface area ?Tap an option to check your answer.
Question 3
CDS 2 2020
73The surface areas of two spheres are in the ratio . What is the ratio of their volumes ?Tap an option to check your answer.
Question 4
CDS 1 2023
58The surface area of a cube is increased by 25%. If p is the percentage increase in its length, then which one of the following is correct ?Tap an option to check your answer.