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  3. 8th Class
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  5. Combustion and Flame

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

  • question_answer
    Which of the following substances is non- combustible?

    A)  Wood                  

    B)  Biogas

    C)  Kerosene oil                     

    D)  A piece of stone

    Correct Answer: D

    Solution :

      A piece of stone is non-combustible. A substance is defined as non-combustible if it does not react with oxygen to produce heat. A piece of stone does not react with oxygen. The correct answer is D.


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