8th Class Science Combustion and Flame Question Bank Combustion and Flame

  • question_answer The total amount of heat produced by a fuel having a calorific value of 20 kJ kg 1 was found to be 50,000 joules. How much fuel was burnt?

    A)  2500 kg                               

    B)                         250 kg                 

    C)                         25 kg                                    

    D)                         2.5 kg

    Correct Answer: D

    Solution :

    1 kg of fuel when burnt gives 20,000 joules of heat energy. 50,000 joules of heat energy will be produced by 2.5 kg of fuel as given below. 1 kg fuel produces \[20\,kJ\,k{{g}^{-1}}\] heat ? fuel produces \[50\,kJ\,k{{g}^{-1}}\] heat \[=\frac{50000}{20000}=2.5\,kg\]

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