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UPSC Physics Heat Question Bank Sound, Oscillations, Heat and Thermodynamics

  • question_answer
          The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used?                                    [NDA]

    A) 78 r.p.m.          

    B)      56 r.p.m.

    C) 45 r.p.m.          

    D)      33 r.p.m.

    Correct Answer: B

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