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Question
Which of the following is the correct statement of the second law of thermodynamics?
Options:
A .  There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
B .  It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
C .  It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
D .  All of these
Answer: Option D
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