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NEET Sample Paper NEET Sample Test Paper-41

  • question_answer
    The coefficient of performance of a refrigerator is 5. It the temperature inside freezer is \[-20{}^\circ C\], the temperature of the surroundings to which it rejects heat is:

    A) \[11{}^\circ C\]                        

    B) \[21{}^\circ C\]   

    C) \[31{}^\circ C\]                        

    D) \[41{}^\circ C\]

    Correct Answer: C

    Solution :

    coefficient of performance \[\beta =5\] \[{{\operatorname{T}}_{L}}=273-20=253K\]C \[{{\operatorname{T}}_{H}}=303.6K\] \[{{\operatorname{T}}_{H}}=303.{{6}^{o}}C\,\,\,\simeq {{31}^{o}}C\]\[\]


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