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Which of the following statements is INC...

Which of the following statements is INCORRECT for the second law of thermodynamics?

A

The spontaneous flow of heat is always from higher temperature to lower temperature.

B

No machine has yet been made that has an efficiency unity.

C

Heat cannot be completely converted into equivalent work.

D

The spontaneous flow of heat is always bidirectional.

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The correct Answer is:
D
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