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NEET Sample Paper NEET Sample Test Paper-22

  • question_answer
    A flat plate of area \[10\text{ }c{{m}^{2}}\] is separated from a large plate by a layer of glycerine 1 mm thick. If the coefficient of viscosity of gylcerine is 20 poise, the force required to keep the plate moving with a velocity of 1 cm/sec is:

    A)  80 dynes         

    B)      200 dynes      

    C)       800 dynes       

    D)       2000 dynes                

    Correct Answer: D

    Solution :

    \[F=-\eta A\frac{dv}{dx}=20\times 10\times \frac{1}{0.1}=2000\,\]dynes. Hence, the correction option is [d].


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