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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Surface Tension

  • question_answer
    Force necessary to pull a circular plate of 5 cm radius from water surface for which surface tension is 75 dynes/cm, is [MP PMT 1991]

    A)             \[30dyne\]

    B)                      60 dynes         

    C)             750 dynes

    D)                      750 \[\pi \]dynes

    Correct Answer: D

    Solution :

                    The total length of the circular plate on which the force will act\[=2\pi R\] Force to pull\[=2\pi RT=2\times \pi \times 5\times 75=750\pi \]dynes


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