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

  • question_answer
    Rajiv took three substances P, Q, and R and burnt them one by one. He noted down his observations given below. I. Substance P bums quickly producing heat and light. II. Substance Q bums in room temperature on its own. III. Substance R bums with the evolution of heat, light, and sound. Which of the following statements regarding the given information is correct?                  

    A)  Substances P and Q are undergoing rapid combustion whereas R is undergoing explosion.

    B)  Substances P and R are undergoing spontaneous combustion whereas Q is undergoing rapid combustion.

    C)  Substance P is undergoing rapid combustion, Q is undergoing spontaneous combustion while R is undergoing explosion.

    D)  Substance P is undergoing spontaneous combustion, Q is undergoing rapid combustion while R is undergoing explosion.

    Correct Answer: C

    Solution :

      Substances which burn rapidly and produce heat and light are said to undergo rapid combustion. The substances that burn on their own at room temperature are said to undergo spontaneous combustion. The substances which burn with the evolution of heat, light, and sound are said to undergo explosion. The correct answer is C.


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