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

  • question_answer
    Harish    performed    two    different experiments I and II. In experiment I, he provides a substance 'X? with some heat. He found out that a sudden reaction takes place to form heat, light, and sound. In experiment II, he provides heat to a substance 'Y?. He found out that when Y bums, only heat and light are produced. Experiment I represents   an   example of __i__, and experiment II represents an example of __ii___. The information in which alternative completes the given statement?

    A)  i-Explosion, ii-Rapid combustion

    B)  i-Explosion, ii-Sportaneous combustion

    C)  i-Spontaneous combustion, ii-Explosion

    D)  i-Rapid combustion, ii-Spontaneous combustion

    Correct Answer: A

    Solution :

      A substance when burns to produce huge amount of heat, light, and sound represents an example of explosion. On the other hand, when a substance burns rapidly to produce huge amount of heat and light represents an example of rapid combustion. Hence, experiment I represents an explosion, whereas experiment II represents a rapid combustion. The correct answer is A.


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