Question

Jatin is playing with a spherical ball of radius r, and a glass which is

shaped like a right circular cylinder. He then puts the ball inside the

cylindrical glass and observes that it just encloses the spherical ball,

as shown in the figure –

(i) What is the height of cylinder?

a) 2r b) 3r

c) 4r d) r

(ii) What is the surface area of the sphere?

a) 2πr2 b) 4πr2

c) (4/3)πr2 d) 3πr2

(iii) What is the curved surface area of the cylinder?

a) 2πr2 b) 8πr2

c) 6πr2 d) 4πr2

(iv) What is the ratio of the areas obtained in above part (ii) & part (ii​

Answer 1

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