The spring balance $A$ reads $2 \mathrm{kg}$ with a block $m$ suspended from it. $A$ balance $B$ read $5 \mathrm{kg}$ when a beaker with liquid is put on the pan of the balance. The two balances are now so arranged that the hanging mass is inside the liquid in the beaker as shown in the figure. In this situation

In the given figure $P_1$ and $P_2$ are the pressures in broad and narrow tubes with closed ends. Select the correct option

Water is flowing through a pipe as shown in figure. If $P_1,P_2$ and $P_3$ are pressures and $v_1,v_2$ and $v_3$ are velocities of water at the different sections as shown in figure, then

If velocity of efflux is $v$ and area of orifice is $A_0$ then