The question consists of two statements, namely, Assertion (A) and Reason (R). Please select the correct answer.

Assertion (A)	Reason (R)
The outer and inner radii of a hollow cylinder 2 m 10 cm long are 5 cm and 3 cm respectively. If it is made up of copper, then volume of copper in it is	The volume of a hollow cylinder of length external radius and internal radius is given by

Assertion (A)

Reason (R)

The base radius of a cone is 7 cm and its slant height is 25 cm. The volume of the cone is

The volume of a right circular cone of base radius and height is

Assertion (A)

Reason (R)

The surface area of a sphere is Its volume is

The volume of a sphere of radius is

Assertion (A)

Reason (R)

If the radius of a sphere is doubled then the ratio of the volume of the first sphere to that of the second is 1 : 8.

A cone and a hemisphere have equal bases and equal volumes. The ratio of their heights is 1 : 2.

Assertion (A)

Reason (R)

The curved surface area of a cone is and its diameter is 14 cm. Then, its slant height is 25 cm.

The curved surface area of a cone having base radius and slant height is