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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