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The radius of a hemispheircal balloon in...

The radius of a hemispheircal balloon increases from 6 cm to 2 cm is air is being pumped into it. The ratio of the surface areas of the balloons in two cases is

A

`1:4`

B

`2:3`

C

`1:3`

D

`1:2`

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MODERN PUBLICATION-SURFACE AREAS AND VOLUMES-EXERCISE
  1. The volume of a sphere of radius 10.5 cm is

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  2. The volume of a sphere is 38808 cm^3. Its curved surface area is

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  3. The radius of a hemispheircal balloon increases from 6 cm to 2 cm is a...

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  4. A hemispherical bowl of internal radius 9 cm is full of liquid. This ...

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  5. A cone and a hemispher have equal bases and equal volumes. Find the ra...

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  6. The radius of a sphere is 2r. Then its volume will be

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  7. The total surface area of a cube is 96cm^2. The volume of the cube is

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  8. A cone is 8.4 cm high and the radius of its base is 2.1 cm. It is melt...

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  9. In a cylinder radius is doubled and height is halved, curved surface a...

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  10. The total surface area of a cone whose radius is r/2 and slant height ...

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  11. Base radius of two cylinder are in the ratio 2 : 3 and their heights a...

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  12. The lateral surface area of a cube is 256cm^2. The volume of the cube ...

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  13. The number of planks of dimensions (4mxx50mxx20cm) that can be stored ...

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  14. The length of the longest pole that can be put in a room of dimensions...

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  15. The radius of a hemispheircal balloon increases from 6 cm to 2 cm is a...

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  16. The slant height of a right circular cone is 10 cm and its height is 8...

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  17. A cone and a hemispher have equal bases and equal volumes. Find the ra...

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  18. Three solid sphres of radius 1 cm, 6 cm and 8 cm, respectively are mel...

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  19. The ratio of the volumes of a right circular cylinder and a right circ...

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  20. If the ratio of the volumes of two spheres is 1:8, then the ratio of t...

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