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8th Class Science Friction Question Bank Friction HOTS Objective Problems

  • question_answer
    Pappu is applying a large force in order to push a heavy box lying on the floor. Then, his younger brother, Chintu spreads a little bit of oil on the floor. Now, Pappu feels that it has become relatively easier to move the box. This happens because the

    A)  Oil magnifies the applied muscular force

    B)  Oil reduces the friction between two surfaces

    C)  Application of oil generates an upward thrust

    D)  Application of oil reduces the gravitational force

    Correct Answer: B

    Solution :

      Oil is one of the best lubricants. The application of lubricants between two moving surfaces reduces the friction between them. Since friction always opposes motion, the resistance against the motion of the given box is reduced on the oil spread floor. Hence, Pappu can push the box by applying a relatively lesser muscular force. The correct answer is B.


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