1. The surface areas of two spheres are in the ratio 1 : 2. The ratio of their volume is:

2. The radius of spherical balloon increases from 8 cm to 12 cm. The ratio of the surface areas of balloon in two cases is:

3. Two cubes each of volume 8 cm³ are joined end to end, then the surface area of the resulting cuboid is:

4. A cylindrical pencil sharpened at one edge is combination of:

5. Taking π = \(\frac{22}{7}\), if surface area of a sphere is 616 cm², then its diameter is:

6. The area of the square that can be inscribed in a circle of radius 8 cm is (in cm²):

7. The curved surface area of a right circular cone of height 15 cm and base diameter 16 cm² is:

8. A shuttle cock used for playing badminton has the shape of a combination of:

9. The total surface area of a solid hemisphere of radius r is:

10. The radius of a wire is decreased to one third. If volume remains the same, the length will become: