1.  For a sphere of radius 10 cm. the numerical value of the surface area is how many per cent of the numerical value of its volume?
A. 24%
B. 26.5%
C. 30%
D. 45%

Answer: Option C

Explanation:

Surface area sphere = 4π x (10)2

Volume sphere= 4π/3 x (10)3

      = (4000π/3) cm3

 Required percentage = {(400πx 3) / (4000π)} x 100 %

     = 30%