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MGIMS WARDHA MGIMS WARDHA Solved Paper-2010

  • question_answer
    Given that the surface tension of water is 75 dyne/cm, its density 1 g/c and angle of contact zero, the height to which water rises m a capillary tube of 1 mm diameter is (Take g= 10 m/s2)

    A)  9.0cm                                  

    B)  7.5cm

    C)  6.0cm                                  

    D)  3.0cm

    Correct Answer: D

    Solution :

                     Height to which water rises in the capillary tube is \[h=\frac{2T\,\cos \theta }{r\rho g}\] Given, \[T=75\text{ }dyne/cm,\text{ }\theta =0{}^\circ ,\text{ }r=\frac{1}{2}\times 10\text{ }cm,\] \[g=10\text{ }m/{{s}^{2}},\rho =1\text{ }g/cc\] \[\therefore \]  \[h=\frac{2\times 75\times \cos {{0}^{o}}\times 2}{10\times 10}=3cm\]


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