The atmospheric pressure and height of barometer column is ${10}^5{\mathrm{P}}_{\mathrm{a}}$ and $760\mathrm{mm}$ respectively on the Earth surface. If the barometer is taken to the Moon then column height will be :- 

A balloon filled with air is weighted, so that it barely floats in water as shown in figure. When it is pushed down so that it gets submerged a short distance in water, then the balloon:-

A solid uniform ball having volume $V$ and density $\rho$ floats at the interface of two immiscible liquids as shown in figure. The densities of the upper and the lower liquids are ${\rho }_1$ and ${\rho }_2$ respectively, such that ${\rho }_1<\rho <{\rho }_2$. What fraction of the volume of the ball will be in the lower liquid :-

Three blocks, labelled $A, B,$ and $C,$ are floating in water as shown in the drawing. Blocks $A$ and $B$ have the same mass and volume. Block $C$ has the same volume, but is submerged to a greater depth than the other two blocks. Which one of the following statements concerning this situation is/are true ?