A U-tube is partially filled with water. Oil which does not mix with water is next poured into one side, until water rises by $25 \mathrm{cm}$ on the other side. If the density of the oil is $0.8 \mathrm{g} {\mathrm{cc}}^{-1}$, the oil level will stand higher than the water level by:-

A body floats in a liquid contained in a beaker. The whole system is shown in figure falling under gravity. The upthrust on the body due to liquid is :-

A body of volume $100 \mathrm{cc}$ is immersed completely in water contained in a jar. The weight of water and jar before immersion of the body was $700 \mathrm{g} \mathrm{wt}$. After immersion, the weight of water and jar will be