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JCECE Engineering JCECE Engineering Solved Paper-2010

  • question_answer
    An ideal gas expands in volume from \[1\times {{10}^{-3}}{{m}^{3}}\]to\[1\times {{10}^{-2}}{{m}^{3}}\]at \[300\,\,K\] against a constant pressure of\[1\times {{10}^{5}}N{{m}^{-2}}\]. The work done is

    A) \[-900\,\,J\]                       

    B)  \[-900\,\,kJ\]

    C)  \[270\,\,kJ\]                     

    D)  \[900\,\,kJ\]

    Correct Answer: A

    Solution :

    Work done due to change in volume against constant pressure, \[W=-p({{V}_{2}}-{{V}_{1}})\]                 \[=-1\times {{10}^{5}}N{{m}^{-2}}(1\times {{10}^{-2}}-1\times {{10}^{-3}}){{m}^{3}}\]                 \[=-900Nm=-900\,\,J\]\[(1Nm=1J)\]


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