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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Capillarity

  • question_answer
    Two capillaries made of the same material with radii \[{{r}_{1}}=1mm\] and \[{{r}_{2}}=2mm\]. The rise of the liquid in one capillary (\[{{r}_{1}}=mm\]) is 30 cm, then the rise in the other will be                                         [MP PET 1991]

    A) 7.5 cm

    B)                       60 cm

    C)             15 cm

    D)                       120 cm

    Correct Answer: C

    Solution :

                    \[\frac{{{h}_{2}}}{{{h}_{1}}}=\frac{{{r}_{1}}}{{{r}_{2}}}=\frac{1}{2}\Rightarrow {{h}_{2}}=\frac{30}{2}=15cm\]


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