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8th Class Science Combustion and Flame Question Bank Combustion and Flame Formative Objective Problems

  • question_answer
    Which of the following fuels is the most efficient?

    A)  Coal                     

    B)  Wood

    C)  Biogas             

    D)  Charcoal

    Correct Answer: C

    Solution :

      Fuel efficiency is measured in terms of its calorific value. Calorific value is defined as the amount of heat energy produced on complete combustion of 1 kg of fuel. Amongst the above mentioned fuels, biogas has a maximum calorific value of 35000 ?40000 kJ/kg. Hence, it is the most efficient among the given fuels. The correct answer is C.          


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