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Punjab Medical Punjab - MET Solved Paper-2009

  • question_answer
    Water rises to a height \[h\] in a capillary tube lowered vertically into a water to a depth\[l\]. The lower end of the tube is closed inside the water and the tube is taken out of water and opened. If \[l<h\], then the length of water column remaining in the tube is

    A) \[zero\]                                               

    B) \[l+h\]

    C) \[2h\]                                   

    D) \[h\]

    Correct Answer: B

    Solution :

    Due to surface tension water rises into the capillary tube upto height h. It will be so, if the water in capillary tube is in contact with water in the vessel. In the absence of contact of water in tube and water in vessel, the water in tube will form concave meniscus on both the faces in the tube. Thus, the total length of water column in the tube is\[l+h\].


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