Pls tell ans for 13


The solid apparently weighs less in fluid than in air because of the upward buoyant force acting on it in the fluid. 
According to Archimedes principle, the upward buoyant force is equal to the weight of the volume of fluid displaced by the object.
Weight of fluid displaced = Apparent decrease in weight = 1.5kgf−0.9kgf=0.6kgf
Mass of fluid displaced = 0.6kg

So, Volume of Solid = Volume of fluid displaced= MassDensity=0.6kg1.2×103kg/m3=0.5×10-3m3 Actual weight of solid = weight of solid in air =1.5kgf (since buoyant force due to air is negligible)  Mass of solid = 1.5 kg  Density of solid = MassVolume=1.50.5×10-3=3×103kg/m3  Relative density of solid = DensitysolidDensitywater=3×103kg/m31×103kg/m3=3


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