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NEET Sample Paper NEET Sample Test Paper-64

  • question_answer
    A soap film of surface tension \[3\,\,\times \,\,{{10}^{-}}^{2}\,N{{m}^{-}}^{1}\] formed in rectangular frame, can support a straw. The length of the film is 10 cm. Mass of the straw the film can support is

    A) 0.06 g              

    B) 0.6 g

    C) 6 g                               

    D) 60 g

    Correct Answer: B

    Solution :

    The weight of straw will be balanced by the force of surface tension \[\therefore \,\,\,\,\,mg\,\,=\,\,2Tl\,\,\Rightarrow \,\,m=\frac{2Tl}{g}\] \[=\,\,\,\,\frac{2\times 3\times {{10}^{-2}}\times 10\times {{10}^{-2}}}{9.8}\,kg\,\,=\,\,0.6\,g\]


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