## SURFACE AREAS AND VOLUMES class 9 CBSE

1. Curved surface area of a cone is thrice and

curved surface area of the other. Slant height of

�second cone is thrice the slant height of first.

Find ratio of their radii.

��2. A well of 2m diameter is dug 14m deep on the

ground. Find the volume of earth taken out.

� 3. Volume of a solid sphere is 36*πcm*�

. Find its radius.

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4. A boy recasted a cone of 4cm height and 27cm

radius into a solid sphere. Find the radiusof the sphere.

5. What will be the volume of a cylindrical tank

whose radius is 7 cm and height is 5 cm?

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6. How many solid spheres of� 2/3

*cm *radius can

be made from a solid sphere of 2 cm radius?

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7. The volume of a right circular cylinder is 392 π

*cm*3

and its height is 8 cm. Find the radius?

8. How much Aluminium sheet will be required to make

a container with lid whose length is 13 m, breadth is 8 m and height is 4

m?

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ANSWERS:

� 1. 9:1

�

2. 44m�

� 3. 3cm

� 4 . 9cm

� 5. 770cm�

� 6. 2714. 3 units

� 7� . 7cm

� 8� . 376m�