Which of the following is incorrect regarding the first law of thermodynamics? (a) It is a restatement of the principle of conservation of energy (b) It is not applicable to any cyclic process (c) It introduces the concept of the entropy (d) It introduces the concept of the internal energy

Answer: (b). First law Q = Δ U + W is the law of conservation of energy: (a) correct. It defines internal energy U as a state function: (d) correct. It applies to every process, including cyclic ones (there Q = W): (b) is incorrect. So the answer is (b).

Which of the following is incorrect regarding the first law of… | JEE Main 2005 (AIEEE, (one Or More Correct))

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P-V Diagrams & Cyclic Processes

Which of the following is incorrect regarding the first law of thermodynamics?

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Answer: (b)

First law $Q = \Delta U + W$ is the law of conservation of energy: (a) correct.
It defines internal energy $U$ as a state function: (d) correct.
It applies to every process, including cyclic ones (there $Q = W$ ): (b) is incorrect.
So the answer is (b).

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