The ratio between the curved surface area and the total surface area of a right circular cylinder is 1 : 2. If the total surface area is 616 cm², the volume of the cylinder is :

1. 1232 cm³

2. 1078 cm³

3. 1848 cm³

4. 1548 cm³

The number of coins, 1.5 cm in diameter and 0.2 cm thick to be melted to form a right circular cylinder of height 10 cm and diameter 4.5 cm, is :

1. 380

2. 450

3. 472

4. 540

If the radius of the base of a right circular cylinder is halved, keeping the height same, what is the ratio of the volume of the new cylinder to that of the original one?

1. 1 : 2

2. 1 : 4

3. 1 : 8

4. 4 : 1

The curved surface area of a cylinder is 4400 cm² and the circumference of its base is 110 cm. The volume of the cylinder (in cm³) is :

1. 36000

2. 38500

3. 40150

4. 42250