The pans of a physical balance are in equilibrium. Air is blown under the right hand pan; then the right hand pan will

Give the formula for measurement of velocity of fluid in a broader part of venturi-meter.

What type of fluid can be applied in Bernoulli’s equation ?

The lift of an air plane is based on

In the diagram shown, the difference in the two tubes of the manometer is $5\, cm$, the cross section of the tube at $A$ and $B$ is $6\, mm^2$ and $10\, mm^2$ respectively. The rate at which water flows through the tube is ........ $ cc/s$ $(g\, = 10\, ms^{-2})$

Give reason why mercury does not wet glass.