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

  • question_answer
    Water rises upto a height h in a capillary on the surface of earth in stationary condition. Value of h increases if this tube is taken                             [RPET 2000]

    A) On sun

    B)                      On poles

    C)             In a lift going upward with acceleration          

    D)             In a lift going downward with acceleration

    Correct Answer: D

    Solution :

                    If lift moves downward with some acceleration then  effective g decreases, so h increases. As \[h=\frac{2T\cos \theta }{rdg}\] \\[h\propto \frac{1}{g}\]


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