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CMC Medical CMC-Medical VELLORE Solved Paper-2014

  • question_answer
    The direct conversion of A to B is difficult, hence it is carried out by the following shown path \[\underset{A}{\mathop{\underset{\uparrow }{\mathop{C}}\,}}\,\xrightarrow{{}}\underset{B}{\mathop{\underset{\downarrow }{\mathop{D}}\,}}\,\]           Given,         \[\Delta {{S}_{(A\to C)}}=50\,\,eu\]                 \[\Delta {{S}_{(C\to D)}}=30\,\,eu\]                 \[\Delta {{S}_{(D\to B)}}=20\,\,eu\]where eu is entropy unit, then\[\Delta {{S}_{(A\to B)}}\]is

    A)  + 100 eu             

    B)  + 60 eu

    C)  - 100 eu              

    D)  - 60 eu

    Correct Answer: B

    Solution :

              \[\Delta {{S}_{A\to B}}=\Delta {{S}_{(A\to C)}}+\Delta {{S}_{(C\to D)}}+\Delta {{S}_{(D\to B)}}\] \[=\Delta {{S}_{(A\to C)}}+\Delta {{S}_{(C\to D)}}-\Delta {{S}_{(B\to D)}}\] \[=50+30-20\]


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