Statement I : First law of thermodynamics does not forbid flow of heat from lower temperature to higher temperature.
Statement II : Heat supplied to a system always equal to the increase in its internal energy.

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If both statement I and statement II are true and statement II is the correct explanation of statement I.

If both statement I and statement II are true but statement II is not the correct explanation of statement I.

If statement I is true but statement II is false

If both statement I and statement II are false

answer is C.

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Detailed Solution

First law of thermodynamics tells only about the conversion of mechanical energy into the heat energy and vice-versa. It does not put any condition as to why heat cannot flow from lower temperature to higher temperatures.

$dQ = dU + dW$

If heat is supplied as such its volume does not change i.e., dV = 0, then whole of the heat energy supplied to the system will increase in its internal energy only.

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