Exemplar Exercise Problems I — task. Mathematics CBSE, Class 9.

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1. The radius of a sphere is

$2r$ , then its volume will be

$\frac{32}{3} \pi r^3$
$4 \pi r^3$
$\frac{4}{3} \pi r^3$
$\frac{8\pi r^3}{3}$

2. A cone is

$8.4 cm$ high and the radius of its base is

$2.1 cm$ . It is melted and recast into a sphere. The radius of the sphere is :

$2.4 cm$
$2.1 cm$
$4.2 cm$
$1.6 cm$

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