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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 100 kg of water in 10 s to a height of 100 m is

    A)  9.8 kW                

    B)  120 kW

    C)  1.2 kW                                

    D)  1200 kW

    Correct Answer: A

    Solution :

      Given, mass of water \[(m)=100\,\,kg\] Time \[(t)=10s\] Height\[(h)=100m\] Acceleration due to gravity \[(g)=9.8m/{{s}^{2}}\] Power (p) = ? We know that, \[p=\frac{mgh}{t}\] \[\Rightarrow P=\frac{100\times 9.8\times 100}{10}=9800\,\,W\]            


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