Q: A solid spherical ball made of iron is melted and two new balls are made whose diameters are in the ratio of 1 : 2. The ratio of the volume of the smaller new ball to the original ball is
(a)1 : 3
(b)1 : 5
(c)2 : 9
(d)1 : 9
Correct Answer: (c)
Detailed explanation coming soon.