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  5. Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन

NEET Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन NEET PYQ-Fluid Mechanics, Surface Tension and Viscosity

  • question_answer
    A capillary tube of radius r is immersed in water and water rises in it to a height h. The mass of the water in the capillary is 5 g. Another capillary tube of radius 2r is immersed in water. The mass of water that will rise in this tube is: [NEET 2020]

    A)  5.0 g   

    B)       10.0 g

    C)  20.0 g

    D)       2.5 g

    Correct Answer: B

    Solution :

    [b] Force of surface tension balances the weight of water in capillary tube.
    \[{{F}_{S}}=2\pi rTcos\,\theta =mg\]
    Here, T and \[\theta \] are constant
    So, \[m\propto ~r\]
    Hence, \[\frac{{{m}_{2}}}{5.0}=\frac{2r}{r}\]
    \[\Rightarrow {{m}_{2}}=10.0\,g\]


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