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Question

A solid sphere of radius x cm is melted and recast into a shape of a solid cone of radius x cm. The height of the cone is:

A
3x cm
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B
x cm
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C
4x cm
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D
2x cm
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Solution

The correct option is D 4x cm
Let the height of the cone be h cm
Volume remains constant after the recast.
Therefore, volume of cone = volume of sphere so,
13πx2h=43πx3x2h=4x3h=4x

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