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UPSC General Studies Solved Paper - General Studies-2013

  • question_answer
    Ball bearings are used in bicycles, cars etc because

    A)  the actual area of contact between the wheel and axle is increased

    B)  the effective area of contact between the wheel and axle is increased

    C)  the effective area of contact between the wheel and axle is reduced

    D)  None of the above

    Correct Answer: C

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