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JIPMER Jipmer Medical Solved Paper-2000

  • question_answer
    A refrigerator has a coefficient of performance is 9. If the surrounding temperature is \[27{}^\circ C\]. The minimum temperature it can cool a body inside is (in\[{}^\circ C\]):

    A) 3                                             

    B)        zero                      

    C)        10                                          

    D)        -3

    Correct Answer: D

    Solution :

    From the formula of coefficient of performance of a refrigerator is given by \[9=\frac{{{T}_{2}}}{{{T}_{1}}-{{T}_{2}}}\]   (Given: \[{{T}_{1}}=27{}^\circ =300K\]) or            \[9=\frac{{{T}_{2}}}{300-{{T}_{2}}}\] or              \[2700-9{{T}_{2}}={{T}_{2}}\] or                            \[10{{T}_{2}}=2700\] or                            \[{{T}_{2}}=270K=-\,3{}^\circ C\]


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