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

  • question_answer
    Arrange the following fuels in the increasing order of their calorific value.
    (i) Petrol
    (ii) Wood
    (ii) Coal
    (iv) Natural gas

    A)  (i), (ii), (iii), (iv)

    B)                         (ii), (iii), (iv) and (i)

    C)                         (ii), (i), (iii) and (iv)

    D)                                         (ii), (iii), (i) and (iv)                

    Correct Answer: D

    Solution :

    (i) Wood ? 17000 to 22000 kJ/kg (ii) Coal ? 25000 to 33000 kJ/kg (iii) Petrol ? 45000 kJ/kg (iv) Natural gas ? 50000 kJ/kg                 The correct order of the increasing order of calorific values is: (ii), (iii), (i), (iv).


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