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Railways NTPC (Technical Ability) Thermodynamics Question Bank Thermodynamics

  • question_answer
    \[{{M}_{1}}\] kg of water at \[{{T}_{1}}\] is isobarically and adiabatically mixed with \[{{M}_{2}}\,\,kg\] of water at \[{{T}_{2}}\,({{T}_{1}}>{{T}_{2}}).\] The entropy change of the universe is:

    A) Necessarily positive

    B) Necessarily negative

    C) Always zero

    D) Negative or positive but not zero

    Correct Answer: A

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