Heat and Mass Transfer
Depending on the radiating properties, a body will be black when(Where a = absorptivity, p = reflectivity, X = transmissivity.)

P= 1, T = 0 and a = 0
X = 0, a + p = 0
P = 0, x = 1 and a = 0
P = 0, x = 0 and a = 1

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Heat and Mass Transfer
Conduction is a process of heat transfer

From a hot body to a cold body, in a straight line, without affecting the intervening medium
From one particle of the body to another without the actual motion of the particles
None of these
From one particle of the body to another by the actual motion of the heated particles

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