Statement $A :$ Convection involves flow of matter within a fluid due to unequal temperatures of its parts.

Statement $B :$ A hot bar placed under a running tap water loses heat due to effect of convection within water.

Statement. $C :$ Heat transfer always involves temperature difference between two systems.

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Important Questions on Heat Transfer

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The freezer in a refrigerator is located at the top section so that

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If the surface is a perfect reflector, the change in momentum of the wave after falling on the surface is

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IMPORTANT

A black body at high temperature emits radiations of

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IMPORTANT

If a carved black utensil is heated to high temperature and then brought in dark then :

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IMPORTANT

The ideal black body is :

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IMPORTANT

(A)	The energy emitted versus wavelength plot of a black body depends on the material of the black body.
(B)	The emissivity of a completely reflecting surface is zero.
(C)	Emissivity is equal to ${(absorptive power)}^{2}$ .
(D)	Black-body radiates more than normal body Which of the following is correct?