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JEE Main & Advanced Physics Work, Energy, Power & Collision / कार्य, ऊर्जा और शक्ति Question Bank Self Evaluation Test - Work, Energy and Power

  • question_answer
    The energy content of gasoline is\[3.6\times 1{{0}^{7}}J/L\]. A motor with an efficiency of 20% is needed at fall output power of 45 kW for 50.0 minutes. How many litres of gasoline are required to operate the motor for this amount of time?

    A) 0.31 L

    B) 0.38 L

    C) 1.6 L

    D) 19 L

    Correct Answer: D

    Solution :

    [d] \[E=Pt=45\times {{10}^{3}}\times 50\times 60=1.35\times 1{{0}^{8}}\] \[V=\frac{1.35\times {{10}^{8}}}{3.6\times {{10}^{7}}}=3.75L\] Since the motor is 20% efficient, five times as much gasoline is needed.


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