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1. If a right angled triangle is revolved about one of the sides containing the right angle it forms a

2. If the radius of the base of a right circular cylinder is halved keeping the height same, then the ratio of the volume of the cylinder thus obtained to the volume of original cylinder is

3. A right circular cylinder of radius r cm and height h cm (h>2r) just enclosed a sphere of diameter

4. If the curved surface area of a right circular cylinder is 1760 cm2 and its radius is 10 cm, then what is its height?

6. Total surface area of a cylinder is equal to

7. If two identical solid cubes each of volume 64 cm3 are joined end to end, then the total surface area of the resulting cuboid is:

9. If H and h be the heights of two cylinders, then the ratio of curved surface areas of two cylinders with equal radii is

10. A circular tent is cylinder to a height of 4 m and conical above it. If its diameter is 105 m and its slant height is 40 m, then the area of canvas required is

11. There are two cones. The curved surface area of one is twice that of the other. The slant height of the latter is twice that of the former. The ratio of their radii is

13. The area of the base of a cone is 616 sq. cm. If its height is 48 cm then its total surface area is:

14. A cylindrical pencil sharpened at one edge is the combination of

16. A circus tent is cylindrical to a height of 4 m and conical above it. If its diameter is 105 m and its slant height is 40 m, the total area of the canvas required is

19. If the radius of base of a cylinder is doubled and the height remains unchanged, its curved surface area becomes

20. If the surface area of a sphere is 144 π cm2, then its radius is