If a cone is cut into two parts by a horizontal plane passing through the mid-points of its axis, the ratio of the volumes of the upper part and the cone is : 

2. The curved surface area of a right circular cone of height 15 cm and base diameter 16 cm is :

3. A cone, a hemisphere and a cylinder stand on equal bases and have the same height. The ratio of their volumes is :

4. A child reshapes a cone made up of China clay of height 24 cm and radius of base 6 cm into a sphere. The radius of the sphere is :

5.A solid piece of iron in the form of a cuboid of dimensions 49 cm × 33 cm × 24 cm is moulded to form a solid sphere. The radius of the sphere is :

6. The volume of a sphere (in cu. cm) is equal to its surface area (in sq. cm). The diameter of the sphere (in cm) is :

7. The volume of the largest right circular cone that can be cut out from a cube of edge 4.2 cm is :

8. A solid sphere of radius x cm is melted and cast into a shape of a solid cone of radius x cm. Then the height of the cone is :

10. A soild sphere of diameter 6 cm is melted and drawn into a wire of radius 4 mm. The length of wire is :