CEE Kerala Engineering CEE Kerala Engineering Solved Paper-2009

  • question_answer
    The excess pressure inside a spherical drop of water is four times that of another drop. Then their respective mass ratio is

    A)  \[1:16\]              

    B)         \[8:1\]

    C)  \[1:4\]                 

    D)         \[1:64\]

    E)  \[32:1\]

    Correct Answer: D

    Solution :

    Excess pressure inside a spherical drop of water \[P=\frac{2T}{R}\] Given:   \[{{p}_{1}}=4{{p}_{2}}\]                 \[\frac{2T}{{{R}_{1}}}=4\times \frac{2T}{{{R}_{2}}}\] Or           \[{{R}_{2}}=4{{R}_{1}}\]  Now,      \[\frac{{{m}_{1}}}{{{m}_{2}}}=\frac{4\pi R_{1}^{3}{{d}_{1}}}{4\pi R_{2}^{3}{{d}_{2}}}\] Or           \[\frac{{{m}_{1}}}{{{m}_{2}}}=\frac{R_{1}^{3}}{R_{2}^{3}}\] Or           \[\frac{{{m}_{1}}}{{{m}_{2}}}=\frac{1}{64}\]


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