a) 2.5 cm
b) 3 cm
c) 3.5 cm
d) 4 cm
Answer: b
Explanation: Let the radius of the sphere be r cm
$$\eqalign{
& \frac{4}{3}\pi {r^3} = \pi \times {\left( {0.1} \right)^2} \times 3600 \cr
& {r^3} = 36 \times \frac{3}{4} \cr
& {r^3} = 27 \cr
& r = 3\,cm \cr} $$
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