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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 sample of metal weighs 210 gm in air, 180 gm in water and 120 gm in liquid. Then relative density (RD) of

    A)            Metal is 3                               

    B)            Metal is 7                               

    C)            Liquid is 3                               

    D)            Liquid is \[\frac{1}{3}\]

    Correct Answer: C

    Solution :

     Density of metal = \[\rho \], Density of liquid = s If V is the volume of sample then according to problem \[210=V\rho g\]                                                        ?(i) \[180=V(\rho -1)g\] ?(ii) \[120=V(\rho -\sigma )g\]                                    ?(iii) By solving (i), (ii) and (iii) we get \[\rho =7\] and \[\sigma =3\].


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