If a solid circular cylinder of iron whose diameter is 15 cm and height 10 cm is melted and recasted into a sphere, then the radius of the sphere is

1. 15 cm

2. 10 cm

3. 7.5 cm

4. 5 cm

The number of balls of radius 1 cm that can be made from a sphere of radius 10 cm is

1. 100

2. 1000

3. 10000

4. 100000

A cubical ice cream brick of edge 22 cm is to be distributed among some children by filling ice cream cones of radius 2 cm and height 7 cm up to its brim. The number of children who will get the ice cream cones is

1. 163

2. 263

3. 363

4. 463

Twelve solid spheres of the same size are made by melting a solid metallic cylinder of base diameter 2 cm and height 16 cm. The diameter of each sphere is

1. 4 cm

2. 3 cm

3. 2 cm

4. 6 cm