A) says that law of conservation of energy is not valid
B) says that \[\Delta Q=\Delta U\]
C) says that \[\Delta Q=\Delta U+\Delta W\]is not always valid
D) is consistent with the first law
Correct Answer: C
Solution :
Second law of thermodynamics says that as first law of thermodynamics is based on conservation of energy\[[\Delta Q=\Delta U+\Delta W]\]but first law of thermodynamics is not always valid in nature. For example, if we leave a ball from same height it will bounce again and again on the floor and finally comes to rest. It losses all its mechanical energy in the form of heat and sound. But its reverse is not possible means the energy lost will not come back itself and the ball will not start bouncing again. But this process is possible according to first law of thermodynamics but not valid in nature (by 2nd law of thermodynamics).
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