# NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.8 – Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Q-1 Find the volume of a sphere whose radius is

Solution:

- Radius of the sphere

So, Volume of the sphere

- =
- =
- =
^{=}- Radius of the sphere

Volume of the sphere

- =
- =
- =

Q-2 Find the amount of water displaced by a solid spherical ball of diameter.

Solution:

- Spherical ball՚s diameter is

Radius

Amount of water displaced by the spherical ball = Volume of the ball

- =
- =
- =
- =

- The spherical ball՚s diameter

Radius

Amount of water displaced by the spherical ball = Volume of the ball

- =
- =
- =

Q-3 The diameter of a metallic ball is . What is the mass of the ball, if the density of the metal is ?

Solution:

- Diameter of the ball
- Radius

Volume of the ball

- =
- =
- =

Density of the metal is

Therefore, mass of the ball