A thin rectangular card board has dimensions 44 cm x 22 cm. It is rolled along its length to get a hollow cylinder of largest size. Find the volume of the cylinder formed.

The ratio between the curved surface area and the total surface area of a right circular cylinder is 3 : 5. Find the ratio between the height and the radius of the cylinder.

The lateral surface area of a cube is 100 cm²; then its volume is :

1. 25 cm³

2. 125 cm³

3. 625 cm³

4. none of these

The length, the breadth and the height of a cuboid are doubled, the ratio between the volumes of the new cuboid and the original cuboid is :

1. 4 : 1

2. 1 : 4

3. 8 : 1

4. 1 : 8