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GK QUESTION#3005

Consider the following situations related to friction: I. Soles of shoes gradually become worn out after long use. II. Steps of foot overbridges at railway stations get smooth due to continuous movement of people. Which of the statements given above illustrate the effects of friction?

  1. AOnly I
  2. BOnly II
  3. CBoth I and IICorrect answer
  4. DNeither I nor II
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Answer

C. Both I and II

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Explanation

Repeated rubbing at contact surfaces removes material. Shoe soles and heavily used steps both become worn through frictional contact, so both statements illustrate its effects.

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