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

(a) Plate will cool fastest and cube the slowest

(b) Sphere will cool fastest and cube the slowest

(c) Plate will cool fastest and sphere the slowest

(d) Cube will cool fastest and plate the slowest.

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Payal Gupta | Contributor-Level 10

8 months ago

This is a multiple choice answer as classified in NCERT Exemplar

According to Stefan's law H $\propto$ AT⁴ where A is the area and T is the temperature

H_sphere:H_cube:H_plate= A_sphere:A_cube:A_plate

As A_plate is maximum.

Hence the plate will cool

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A glass full of hot milk is poured on the table. It begins to cool gradually. Which of the following is correct?

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(b) The temperature of milk falls off exponentially with time

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(d) All three phenomenon, conduction, convection and radiation are responsible for the loss of heat from milk to the surroundings

Payal Gupta

This is a multiple choice answer as classified in NCERT Exemplar

(b), (c), (d) When the hot milk in the table is transferred to the surroundings by conduction, convection and radiation.

According to newton's law of cooling temperature of the milk falls of exponentially. Heat also will be transferred

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