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  3. 8th Class
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8th Class Science Sample Paper Science Sample Paper-1

  • question_answer
    The calorific values of petrol and CNG are 45000 kj/kg, and 50000 kj/kg respectively. If you have vehicle which can run on petrol as well as CNG, which fuel will you prefer and why?    

    Answer:

    We will prefer CNG (Compressed Natural Gas) because the calorific value of CNG is higher than that of petrol. Therefore, CNG will be more economical. CNG will produce larger amount of heat energy than petrol. At the same time, it produces the least air pollutants.


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