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Friction Test - 3

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Friction Test - 3
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Weekly Quiz Competition
  • Question 1
    1 / -0

    Friction causes wastage of energy in the form of

    Solution

    Due to friction, energy is generally dissipated (wasted) in the form of heat.

     

  • Question 2
    1 / -0

    Which of the following is an advantage of friction?

    Solution

    Friction causes a matchstick to light up and produce a fire.

     

  • Question 3
    1 / -0

    Which of the following activities increases friction in the corresponding case?

    Solution

    Gymnasts apply some coarse substance on their hands to increase friction for better grip.

     

  • Question 4
    1 / -0

    A force of 50 N is required to make a slider move with uniform speed over the steel rail of a machine. Which of the following cannot be the value of the force required to move the slider with the same speed having oiled the rail?

    Solution

    Lubrication (oiling of the surface in this case) reduces friction. Hence, the force required has to be less than 50 N.

  • Question 5
    1 / -0

    The efficiency of a gear train is 75%. Which of the following can be its efficiency after greasing it?

    Solution

    Greasing reduces the frictional forces at play. This increases efficiency. Hence, the efficiency after greasing should be greater than 75%.

     

  • Question 6
    1 / -0

    When a body rolls over the surface of another body, the resistance offered to its motion is called

    Solution

    When a body rolls over the surface of another body, the resistance offered to its motion is called rolling friction.

     

  • Question 7
    1 / -0

    Under identical conditions, which of the following is true for a given body?

    Solution

    Static friction is maximum, sliding friction is less than static friction and rolling friction is least among the three.

     

  • Question 8
    1 / -0

    Under which of the following phases of its flight, will a helicopter experience the maximum drag from air?

    Solution

    When a helicopter is hovering, its horizontal or vertical motion is zero. Hence, it experiences no drag. A helicopter takes off and lands vertically at not a very high speed. Hence, it experiences little drag during these two phases. Only when it is moving at a high speed, it will experience the highest drag from air.

     

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