A sphere, a cube and a thin circular plate have same mass and are made of the same material. All of them are heated to the same temperature. The rate of cooling is :

minimum for the plate.

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minimum for the sphere.

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maximum for the plate.

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same for all the three.

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Solution

The correct options are
A minimum for the sphere.
C maximum for the plate.
For a given volume, among all the three objects, sphere has the least surface area and the circular plate has the maximum surface area.
The rate of loss of heat is proportional to the surface area.
Hence, the rate of cooling is min for sphere and max for the circular plate.

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