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NEET Sample Paper NEET Sample Test Paper-86

  • question_answer
    A rain drop of radius 0.3 mm has a terminal velocity in air = 1 m/s. the viscosity of air is \[8\times {{10}^{-5}}\]poise. The viscous force on it is

    A) \[45.2\times {{10}^{-4}}\text{dyne}\]

    B)        \[101.73\times {{10}^{-5}}\text{dyne}\]

    C) \[16.95\times {{10}^{-4}}\text{dyne}\]

    D)        \[16.95\times {{10}^{-5}}\text{dyne}\]

    Correct Answer: A

    Solution :

    [a] \[F=6\,\pi \,\eta \,r\,v\] \[=6\times 3.14\times (8\times {{10}^{-5}})\times 0.03\times 100\] \[=4.52\times {{10}^{-3}}\,dyne\]


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