Q15 of 26 Page 183

If the ratio of curved surface areas of two solid spheres is 16 : 9, the ratio of their volumes is

Let the radius of two spheres be r₁ and r₂;

Ratio of surface area

⇒

⇒ r₁:r₂ = 4:3

Ratio of volume

The correct option is A.

If the ratio of the volumes of two solid spheres is 1 : 8, the ratio of their curved surface areas is

The whole surface area of a solid hemisphere with length of 7 cm radius is

If numerical value of curved surface area of a solid sphere is three times of its volume the length of radius is

Let us write whether the following statements are true of false.

i. If we double the length of radius of a solid sphere, the volume of sphere will be doubled.

ii. If the ratio of curved surface areas of two hemispheres is 4 : 9, the ratio of their lengths of radii is 2 : 3.