MEDIUM
9th CBSE
IMPORTANT
Earn 100

The radius of a spherical balloon increases from 5 cm to 10 cm as air is pumped into it. Find the ratio of the surface areas of the balloon in the two cases.

Important Questions on Surface Areas and Volumes

EASY
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 12
The diameter of a football is five times the diameter of a cricket ball. Find the ratio of surface area of football to that of cricket ball.
MEDIUM
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 13
The diameter of the moon is approximately one fourth of the diameter of the earth. What fraction of the volume of the earth is the volume of the moon?
MEDIUM
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 14
A cube of side 4 cm contains a sphere touching its sides. Find the volume of the gap in between. 
EASY
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 15
If the number of square centimetres in surface area of a sphere is equal to the number of cubic centimetres in its volume, find the diameter of the sphere.
EASY
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 16
If the total surface area of a solid hemisphere is 942 cm2, find its diametere. (Use π=3.14)
EASY
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 17
A capsule of medicine is in the shape of a sphere of diameter 3.5 mm. How much medicine (in mm3) is needed to fill this capsule?
MEDIUM
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 18
A shopkeeper has one spherical ladoo of radius 5 cm. With the same amount of material, how many ladoos of radius 2.5 cm can be made?
MEDIUM
9th CBSE
IMPORTANT
CBSE Syllabus Standard Mathematics for Class IX>Chapter 13 - Surface Areas and Volumes>Exercise 13.4>Q 19
The surface area of a solid sphere is 1256 cm2. It is cut into two hemispheres. Find the total surface area and volume of a hemisphere. Take π=3.14.