1. If the perimeter of one of the faces of a cube is 40 cm, then its volume is:

2. A cuboid having surface areas of 3 adjacent faces as a, b and c has the volume:

3. The radius of a cylinder is doubled and the height remains the same. The ratio between the volumes of the new cylinder and the original cylinder is

4. Length of diagonals of a cube of side a cm is

5. Volume of spherical shell is

6. Volume of hollow cylinder

7. The radius of a sphere is 2r, then its volume will be

8. In a cylinder, radius is doubled and height is halved, curved surface area will be

9. The total surface area of a cone whose radius is \(\frac{r}{2}\) and slant height 2l is

10. The radius of a hemispherical balloon increases from 6 cm to 12 cm as air is being pumped into it. The ratios of the surface areas of the balloon in the two cases is