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JEE Main & Advanced Physics Fluid Mechanics, Surface Tension & Viscosity / द्रव यांत्रिकी, भूतल तनाव और चिपचिपापन Question Bank Self Evaluation Test - Mechanical Properties of Fluids

  • question_answer
    The total weight of a piece of wood is 6 kg. In the floating state in water its \[\frac{1}{3}\] part remains inside the water. On this floating piece of wood what maximum weight is to be put such that the whole of the piece of wood is to be drowned in the water?

    A) 15 kg

    B) 14 kg

    C) 10 kg

    D) 12 kg

    Correct Answer: D

    Solution :

    [d] Weight of submerged part of the block \[W=\frac{1}{3}v\] (Density of water) g      ...(i) Excess weight,=weight of water having \[\frac{2}{3}\]volume of the block. \[W'=\frac{2}{3}v\] (Density of water) g    ...(ii) \[Dividing(ii)by(i),\,\,\frac{W'}{W}=\frac{2/3}{1/3}\] \[\therefore \,\,\,W'=2\Rightarrow W'=2\times 6=12kg\]


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