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

  • question_answer
    Sujit was performing an experiment in the laboratory. He collected four substances I, II, III, and IV and kept all of them in contact with air at room temperature. He observed that substance III suddenly bursts into flames. Then, he heated I, II, and IV and found out that while I and II catch fire, substance IV does not. However, substance IV catches fire on prolonged heating. Which substance undergoes spontaneous combustion in Sujit's experiment?

    A)  I                                             

    B)  II

    C)  III                          

    D)  IV

    Correct Answer: C

    Solution :

      Spontaneous combustion is the one in which a substance starts burning without any heat provided to it. In the given experiment, substance III suddenly bursts into flames when kept in contact with air at room temperature. Hence, it represents spontaneous combustion. The correct answer is C.


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