NEET Sample Paper NEET Sample Test Paper-15

  • question_answer A spherical drop of water has radius 1 mm. If surface tension of water is \[70\times {{10}^{-3}}N/m\]then the difference of pressures between the inside and outside of the spherical drop is:

    A) \[~35N/{{m}^{-2}}\]                      

    B) \[~70\text{ }N/{{m}^{2}}\]

    C) \[~140\text{ }N/{{m}^{2}}\]                     

    D)  0

    Correct Answer: C

    Solution :

    Let the excess pressure be\[\Delta P\] \[\Delta P=\frac{2T}{R}=\frac{2\times 70\times {{10}^{-3}}}{{{10}^{-3}}}=140\,N/{{m}^{2}}\] Hence, the correction option is [c].

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