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NEET Sample Paper NEET Sample Test Paper-73

  • question_answer
    The volume of an air bubble becomes three times as it rises from the bottom of a lake to its surface. Assuming atmospheric pressure to be 75 cm of Hg and the density of water to be 1/10 J of the density of mercury, the depth of the lake is

    A) 5 m                              

    B) 10 m           

    C) 15 m                

    D) 20 m           

    Correct Answer: C

    Solution :

    \[{{P}_{1}}{{V}_{1}}={{P}_{2}}{{V}_{2}}\,\,\,\,\Rightarrow \,\,\,\,({{P}_{0}}+h\rho g)\,V={{P}_{0}}\times 3\,V\] \[\Rightarrow \,\,\,\,\,\,\,h\rho g=2{{P}_{0}}\] \[\Rightarrow \,\,\,\,\,h=\frac{2\times 75\times 13.6\times g}{\frac{13.6}{10}\times g}\,\,=\,\,15\,\,m\]


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