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8th Class Science Friction Question Bank Friction IIT JEE Objective Problems

  • question_answer
    Arpita observes that the match stick is not catching fire even when she is rubbing it gently against the comer of the matchbox. The match box had been used many times before also. The possible reason for the given problem is that the

    A)  Matchbox has lost its chemical

    B)  Matchbox has lost its roughness

    C)  Quality of wood used in the match stick is not good

    D)  Quality of chemical used in the match stick is not good

    Correct Answer: B

    Solution :

      Working of a match stick is based on the fact that heat is generated when two surfaces are rubbed against each other. Heat is generated by the friction caused between the matchbox and the stick. The given matchbox is very old. It has been used many times previously. Therefore, it can be concluded that the matchbox has lost its roughness. Hence, the required friction is not generated to ignite the stick. The correct answer is B.


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