a) 1 : 2 : 3
b) 1 : 3 : 2
c) 2 : 1 : 3
d) 3 : 2 : 1
Answer: b
Explanation: Required ratio :
= Volume of cone : Volume of cylinder : Volume of hemisphere
$$\eqalign{
& = \frac{1}{3}\pi {r^2}:\pi {r^2}r:\frac{2}{3}\pi {r^3} \cr
& = \frac{1}{3}:1:\frac{2}{3} \cr
& = 1:3:2 \cr} $$
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