A sphere, a cube and a thin circular plate; all are of the same material and same mass and all of them are initially heated to same high temperature. Then:

plate will cool fastest and cube the slowest

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sphere will cool fastest and cube the slowest

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plate will cool fastest and sphere the slowest

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cube will cool fastest and plate the slowest

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Solution

The correct option is C plate will cool fastest and sphere the slowest
1. The surface area of sphere < surface area of the cube for the given same mass and same density.
2. The rate of cooling $\propto$ area of contact with surroundings.
$∴$ the plate will cool faster than the sphere.

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A sphere, a cube and a thin circular plate; all are of the same material and same mass and all of them are initially heated to same high temperature. Then:

The correct option is C plate will cool fastest and sphere the slowest1. The surface area of sphere < surface area of the cube for the given same mass and same density. 2. The rate of cooling ∝ area of contact with surroundings. ∴ the plate will cool faster than the sphere.

The correct option is C plate will cool fastest and sphere the slowest
1. The surface area of sphere < surface area of the cube for the given same mass and same density.
2. The rate of cooling $\propto$ area of contact with surroundings.
$∴$ the plate will cool faster than the sphere.