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  3. CET Karnataka Medical

CET Karnataka Medical CET - Karnataka Medical Solved Paper-2004

  • question_answer
    A thread is tied slightly loose to a wire frame as in figure and the frame is dipped into a soap solution and taken out. The frame is completely covered with the film. When the portion A is punctured with a pin, the thread:

    A)  becomes concave towards A

    B)  becomes convex towards A

    C)  either [a] or [b] depending on the size of A with respect to B

    D)  remains in the initial position

    Correct Answer: C

    Solution :

    The air pressure inside a soap bubble is\[P=\frac{4T}{R}\]which is greater than the atmospheric pressure. If a hole is made at A, air will flow outside through A. Then the thread becomes convex looking from A and from B towards A it is concave. Hence, becoming concave or convex, depends on the size of A with respect to B.


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