Heat Transfer
In thermal radiation for a black body (where, ε is emissivity and α is absorptivity)

α ≠ 1, ε = 1
α = 1; ε = 1
α = 1; ε ≠ 1
α ≠ 1, ε ≠ 1

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Heat Transfer
Heat transfer by conduction results due to the transfer of free electrons, kinetic energy & vibrational energy from one molecule to another. Conduction heat transfer can not take place

From one part of a body to the another part of the same body
Both B & C
Between two bodies in physical contact with each other
Between two bodies not in physical contact with each other

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