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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Pascal's Law and Archimedes Principle

  • question_answer
    A silver ingot weighing 2.1 kg is held by a string so as to be completely immersed in a liquid of relative density 0.8. The relative density of silver is 10.5. The tension in the string in kg-wt is

    A)            1.6 

    B)            1.94                                          

    C)            3.1 

    D)            5.25

    Correct Answer: B

    Solution :

                       Apparent weight \[=V(\rho -\sigma )g=\frac{M}{\rho }(\rho -\sigma )g\]                    \[=M\left( 1-\frac{\sigma }{\rho } \right)g\]\[=2.1\left( 1-\frac{0.8}{10.5} \right)g=1.94\,g\]N            = 1.94 Kg-wt


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