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JCECE Medical JCECE Medical 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, \[W=-p({{V}_{2}}-{{V}_{1}})\] \[=-1\times {{10}^{5}}N{{m}^{-2}}(1\times {{10}^{-2}}-1\times {{10}^{-3}}){{m}^{3}}\] \[=-900Nm=-900\,J\]\[(1\,Nm=1J)\]


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