2. Questions Bank
  3. 8th Class
  4. Science
  5. Friction

8th Class Science Friction Question Bank Friction Formative Objective Problems

  • question_answer
    A mechanical system produces heat energy because of

    A)  Radiation          

    B)  Convection

    C)  Lubrication                        

    D)  Friction

    Correct Answer: D

    Solution :

      In a mechanical system, friction opposes motion between different parts of the system. Work is done against these frictional forces. Hence, heat energy is produced by the system. The correct answer is D.


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