Correct Answer: Option D

Explanation

Volume of liquid displaced

 = \(\frac{2}{3}\)(0.5)\(^3\) = 0.0833cm3

  Mass of liquid displaced = mass of floating cube = 75kg

  Density of liquid = \(\frac{mass}{volume}\)

  = \(\frac{75}{0.0833}\)  

  = 900kgm\(^{-3}\)

  R.D of liquid = \(\frac{(900 )}{(1000)}\) 

  = 0.9

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