a) $$\sqrt 6 :\sqrt 3 $$
b) $$\sqrt 5 :\sqrt 3 $$
c) $$2 : 3 $$
d) $$\sqrt 3 :\sqrt 2 $$
Answer: d
Explanation: Let their heights be 2h and 3h and radii be r and R respectively
$$\eqalign{
& \pi {r^2}\left( {2h} \right) = \pi {R^2}\left( {3h} \right) \cr
& \frac{{{r^2}}}{{{R^2}}} = \frac{3}{2} \cr
& \Rightarrow \frac{r}{R} = \frac{{\sqrt 3 }}{{\sqrt 2 }}\,i.e.,\sqrt 3 :\sqrt 2 \cr} $$
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