R d sharma solutions mathematics class 9 Solutions for Chapter 21 surface area and volume of sphere

Exercises in Chapter 21 surface area and volume of sphere Grade 9

Surface Area And Volume Of Sphere Exercise 21.1

Surface Area And Volume Of Sphere Exercise 21.2

Questions in Surface Area And Volume Of Sphere Exercise 21.1

Find the surface area of a sphere of radius: (i) 10.5 cm

(ii) 5.6 cm

(iii) 14 cm

Find the surface area of a sphere of diameter: (i) 14 cm

(ii) 21 cm

(iii) 3.5 cm

The surface area of a sphere is 5544 cm2,find its diameter.

The dome of a building is in the form of a hemisphere. Its radius is 63 dm. Find the cost of painting it at the rate of Rs. 2 per sq m.

Questions in Surface Area And Volume Of Sphere Exercise 21.2

Find the surface area of a sphere of radius: (i) 10.5 cm

(ii) 5.6 cm

(iii) 14 cm

A hemispherical bowl is made of steel 0.25 cm thick. The inside radius of the bowl is 5cm. Find the volume of steel used in making the bowl.

How many bullets can be made out of a cube of lead, whose edge measures 22 cm, each bullet being 2 cm in diameter?

A cone and a hemisphere have equal bases and equal volumes. Find the ratio of their heights.

A cylinder whose height is two thirds of its diameter, has the same volume as a sphere of radius 4 cm. Calculate the radius of the base of the cylinder.

A vessel in the form of a hemispherical bowl is full of water. The contents are emptied into a cylinder. The internal radii of the bowl and cylinder are respectively 6 cm and 4 cm. Find the height of water in the cylinder.