List of top Physics Questions on Fluid Dynamics

The blades of a windmill sweep out a circle of area \[ A=2\,\text{m}^2. \] The wind is flowing with velocity \[ V=6\,\text{ms}^{-1} \] perpendicular to the circle and the density of air is \[ \rho=1.2\,\text{kgm}^{-3}. \] Then the power of the mill is

The dynamic lift due to the spinning of a ball in a fluid can be explained by:

Water flows in a horizontal pipe. At a point where speed is \(2\,\text{m/s}\), pressure is \(2000\,\text{Pa}\). At another point, speed becomes \(4\,\text{m/s}\). Find pressure at second point. (Density \(= 1000\,\text{kg/m}^3\))

A pipe has cross-sectional areas $4$ cm$^2$ and $1$ cm$^2$. If velocity in the wider section is $2$ m/s, velocity in the narrower section is:

Water flows in a horizontal pipe. At a point where speed is $2$ m/s, pressure is $2000$ Pa. At another point, speed becomes $4$ m/s. Find pressure at second point. (Density $= 1000$ kg/m$^3$)

Instrument fitted in the carburetor of the automobile to provide the correct mixture of air and fuel necessary for combustion works on

A cylindrical tank having large diameter is filled with water to a height \(H\). A hole of cross-sectional area \(5\ \text{cm}^2\) in the tank allows water to drain out. If the water drains out at the rate of \[ 2\times10^{-3}\ \text{m}^3\text{s}^{-1}, \] then the value of \(H\) is
\[ (\text{acceleration due to gravity }=10\ \text{m s}^{-2}) \]

A steady flow of a liquid of density \(\rho\) is shown in figure. At point \(1\), the area of cross-section is \(2A\) and the speed of flow of liquid is \(\sqrt{2}\;m s^{-1}\). At point \(2\), the area of cross-section is \(A\). Between the points \(1\) and \(2\), the pressure difference is \(100\;N m^{-2}\) and the height difference is \(10\;cm\). The value of \(\rho\) is
Take \(g=10\;m s^{-2}\).