NCERT Class 9 Solutions: Surface Areas and Volumes (Chapter 13) Exercise 13.8 – Part 1
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Q1 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

=

=

=
Q2 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

=

=

=
Q3 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