The radius of the cylinder is half of its height and area of the inner part is 616 square metres App...........

Quantitative Aptitude ( CCS) Mensuration 3D

The radius of the cylinder is half of its height and area of the inner part is 616 square metres. Approximately how many litres of milk can it contains?

1.4

1.5

1.8

2.2

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Explanation:

Volume of cylinder = πr^2
v = πr^2(2r) = 2 πr^3 (? = 2r )
Curve Surface area = 2 π rh
= 2 π r (2r) = 4 πr^2
4 πr^2 = 616
r^2 = 49 = r = 7
∴ V = 2 π (7)^3 = 2156 cm^3
= 2.156 litres = 2.2 litres

Hence, option 4 is the correct answer.