Heat and Mass Transfer
According to Newton's law of cooling, the heat transfer from a hot body to a cold body is

Both (A) and (B)
Directly proportional to the surface area
Directly proportional to the difference of temperatures between the two bodies
Either (A) or (B)

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Heat and Mass Transfer
According of Kirchhoff's law

Ratio of emissive power to absorptive power for all bodies is same and is equal to the emissive power of a perfectly black body
Emissive power and absorptivity are constant for all bodies
Radiant heat is proportional to fourth power of absolute temperature
Emissive power depends on temperature

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