A cube, a sphere and a circular plate made of same material and having same mass are heated to same high temperature. The body that cools at the least rate when left in air at room temperature is

Sphere

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Cube

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Circular plate

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All at the same rate

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Solution

The correct option is A Sphere
The only difference is the area of the bodies because of their different shapes. The surface area of a sphere is the smallest compared to a disk or a cube of same mass. Apart from that from any corner heat is released faster. That is why a sphere cools down at a slower rate compared to a disk or a cube of same mass.

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