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NEET Sample Paper NEET Sample Test Paper-25

  • question_answer
    A battery is charged at a potential of 15 V for 8 H when the current flowing is 10 A. The battery on discharge supplies a current of 5 A for 15 H. The mean terminal voltage during discharge is 14 V. The "watt-hour" efficiency of the battery is:

    A)  82.5%

    B)  80%

    C)  90%

    D)  87.5%

    Correct Answer: D

    Solution :

     Input energy when the battery is charged \[=Vit\] \[=15\times 10\times 8=1200\,W-h\] Energy released when the battery is discharged \[=14\times 15\times 15=1050\,W-h\] Hence, W-h efficiency of battery is given by \[=\frac{\text{energy}\,\text{output}}{\text{energy}\,\text{input}}=\frac{1500}{1200}\] =0.875=87.5%


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