Volume and Surface Area Class 9

Front

Curved surface area of a right circular cylinder is 4.4 sq.cm. Radius of the base is 0.7 cm. Find the height of the cylinder.

Back

1 Cm

Front

The radius of a hemispherical balloon increases from 6 cm to 12 cm. What is the ratio of the surface areas in the two cases?

Back

1:4

Front

The total surface area of a cube is 96 cm². What is the volume of the cube?

Back

64 cm³

Front

A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melted and recast into a sphere. What is the radius of the sphere?

Back

2.1 cm

Front

Number of planks of dimensions (4 m × 50 cm × 20 cm) that can be stored in a pit of dimensions 16 m × 12 m × 4 m.

Back

1920

Front

Radii of two cylinders are in the ratio 2:3 and heights in the ratio 5:3. What is the ratio of their volumes?

Back

20: 27

Front

A well with 10 m inside diameter is dug 14m deep. Earth taken out of it is spread all around it to make an embankment of height 4 2/3 m. Find the width of the embankment.

Back

5m

Front

If the radius of a sphere is doubled, what is the ratio of their surface area?

Back

1 : 4

Front

If the radius of a cylinder is halved and height is doubled, what will be the curved surface area?

Back

the same

Front

A conical tent is 15m high and the radius of its base is 20m. The cost of canvas required to make the tent at the price of Rs. 7 per m square.

Back

Rs.11000