RRB NTPC Prelims Model Paper 2 with solutions

Question : 85 of 101

Marks: +1, -0

The surface area of two spheres are in the ratio of 4 : 9. What is the ratio of their volume?

Solution:

(4) Let

r_1

and

r_r^2

be the radii of spheres

{r^2_1}/{r^2_2}= 4/ 9

⇒{r_1}/{r_2}=2/3

Ratio of their volumes =

{r^3 _1}/{r^3_1}=2^3 /3^32=8 : 27

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