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

  • question_answer
    Sakshi took a piece of four substances W, X, Y, and Z. She tried to bum each of them by bringing a lighted matchstick near them. She observed that Y and Z bum readily, whereas W bums readily only after sustained heating. However, X does not bum at all. Among the given substances taken by Sakshi, which substance has the highest ignition temperature?

    A)  W                          

    B)  X     

    C)  Y                            

    D)  Z

    Correct Answer: B

    Solution :

      The ignition temperature of a substance is the lowest temperature at which a substance catches fire. On bringing a lighted matchstick near the substances W, X, Y, and Z, the ignition temperature of X is not reached. However, the ignition temperature of W, Y, and Z are reached. Hence, while X does not burn, W, Y, and Z burn readily. Thus, the ignition temperature of X would be the highest among the substances taken by Sakshi. The correct answer is B.


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