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

  • question_answer 22) A family consumes 12 kg of L.P.G. in 30 days. Calculate the average energy consumed per day, if the calorific value of L.P.G. is 50 kJ kg1.

    A)  10,000 J per day

    B)                         15,000 J per day

    C)                                         20,000 J per day                

    D)                                         25,000 J per day

    Correct Answer: C

    Solution :

    Energy released by 12 kg of L.P.G. in 30 days = No. of kg of gas utilized by a family in 30 days\[\times \] calorific value of gas. \[=\frac{12}{30}\times 50=20\,kJ/day.\] Therefore, energy consumed per day:                 = 20,000 joules/day.                

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