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A hollow sphere of internal and external diameters 4 cm and 8 cm respectively is melted into a cone of base diameter 8 cm. The height of the cone is (a) 12 cm    (b) 14 cm     (c) 15 cm      (d) 18 cm

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RD SHARMA ENGLISH-SURFACE AREAS AND VOLUMES-All Questions
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  2. A solid metallic spherical ball of diameter 6 cm is melted and reca...

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  10. The radii of the circular ends of a frustum are 6 cm and 14 cm. If i...

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  11. The height and radius of the cone of which the frustum is a part are...

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  12. The diameters of the ends of a frustum of a cone are 32 cm and 20 cm...

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  13. A solid frustum is of height 8 cm. If the radii of its lower and upp...

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  14. The radii of the ends of a bucket 16 cm high are 20 cm and 8 cm. Th...

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  15. The diameters of the top and the bottom portions of a bucket are 42 cm...

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  17. If the radius of the base of a right circular cylinder is halved, k...

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  18. A metallic solid cone is melted to form a solid cylinder of equal r...

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  19. A rectangular sheet of paper 40 c mxx22 c m , is rolled to form ...

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  20. The number of solid spheres, each of diameter 6 cm that can be made...

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