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  5. Work, Force, Energy and Simple Machines

5th Class Science Work, Force, Energy and Simple Machines Question Bank Work, Force, Energy and Simple Machines

  • question_answer
    Which of the following statements is correct?

    A) Friction is always harmful for us.  

    B) Friction is always useful for us.

    C) Friction is a necessary evil.       

    D) All the above

    E) None of these

    Correct Answer: C

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