RRB Non Technical Model Papers 10 with solutions

Question : 60 of 100

Marks: +1, -0

The total surface area of a solid right circular cylinder is twice that of a solid sphere. If they have the same radii, the ratio between the volume of the cylinder and that of the sphere is given by

9 : 4
2 : 1
3 : 1
4 : 9

Validate

Solution:

(1) According to the question,
2 rh 2 r 8 r

2 πrh +2πr^2=8πr^2

⇒2πrh=6 πr^2

⇒h/r=3

Now, ratio between their volumes is,

{πr^ h }/{4/3πr^ 3} =3/4×h/r=9/4

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