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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 40

  • question_answer
    A wooden block of mass 8 kg is tied to a string attached to the bottom of a tank. The block is completely inside the water. Relative density of wood is 0.8. Taking\[g=10m/{{s}^{2}}\], what is the tension in the string?

    A) 100 N           

    B)        80 N

    C) 50 N                

    D)        20 N

    Correct Answer: D

    Solution :

    [d] Volume of block \[=\frac{8}{0.8\times {{10}^{3}}}={{10}^{-2}}{{m}^{3}}\] U = upthrust = weight of water displaced \[={{10}^{-2}}\times {{10}^{3}}\times 10=100\text{ }N\] w = weight = 80 N \[{{T}_{ension}}=U-W=100N-80N=20N\]


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