Question

The volumes of two spheres are in the ratio 64 : 27. The ratio of their surface areas is

(a) 1 : 2

(b) 2 : 3

(c) 9 : 16

(d) 16 : 9

Answer 1

Ist sphere

…… (i)

IInd sphere

…… (ii)

Divide (i) by (ii) we get,

Now, the ratio of their C.S.A

Hence,

Hence, the correct answer is choice (d).