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What is the limitation of the first law of thermodynamics?

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Knowledge Check

  • Assertion : The efficiency of a heat engine can never be unity. Reason : Efficiency of heat engine is fundamental limitation given by first law of thermodynamics.

    A
    If both assetion and reason are true and reaasons is the correct expanation of assetion
    B
    If both assetion and reason are tur but reason is not the correct explanation of assetion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

  • Of the following, which is the best description of the second law of thermodynamics?

    A
    The total energy of the universe is a constant.
    B
    The efficiency of a heat engine can never be greater than 50 percent.
    C
    The amount of heat required to vaporise a liquid is greater than the amount of heat required to melt a solid of the same substance.
    D
    The entropy of the universe is always increasing.

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