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9th Class Science Work and energy Question Bank Work Power and Energy IIT JEE Objective Problems

  • question_answer
    The power of a pump which can pump 200 kgs of water to a height of 200 m in 10 s is (\[\text{g}=\text{1}0\text{ m}/{{\text{s}}^{\text{2}}}\])

    A)  40 kW  

    B)  80 kW

    C)  400 kW                               

    D)  960 kW

    Correct Answer: A

    Solution :

      Given, \[m=200\,\,kgh=200\,m\] \[t=10s\,\,g=10\,m{{s}^{2}}P=?\] We know, \[P=\frac{mgh}{t}\Rightarrow \frac{200\times 10\times 200}{10}\]                 \[=40000\,\,W\,\,or\,\,40\,\,kW\]                           


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