There are two identical small holes of area of cross-section a on the opposite sides of a tank containing a liquid of density $\rho $. The difference in height between the holes is $h$. Tank is resting on a smooth horizontal surface. Horizontal force which will has to be applied on the tank to keep it in equilibrium is

If velocity of flow is $4 \,m / s$, then velocity head is .........$m$

The venturi-meter works on :

Give reason why mercury does not wet glass.

Water is flowing through a horizontal tube according to the figure. Its diameter at two points are $0.3\,m$ and $0.1\,m$  respectively. Pressure difference between these two points is equal to $0.8\,m$ of water column. Find rate of flow of water in the tube ..... $ltr/s$

Given below are two statements :

Statement $I$ : When speed of liquid is zero everywhere, pressure difference at any two points depends on equation $\mathrm{P}_1-\mathrm{P}_2=\rho \mathrm{g}\left(\mathrm{h}_2-\mathrm{h}_1\right)$

Statement $II$ : In ventury tube shown $2 \mathrm{gh}=v_1^2-v_2^2$

In the light of the above statements, choose the most appropriate answer from the options given below.