NEET Physics MCQs

Two capillaries of same length but different radii $r_1$ and $r_2$ are connected in series. The pressure difference across the first capillary is $\Delta P_1$ and across the second is $\Delta P_2$. If the rate of flow of liquid through the combination is $Q$, and $r_1 = 2r_2$, then the ratio $\Delta P_1/\Delta P_2$ is:

A liquid flows through a pipe of non-uniform cross-section. If the radius at point A is half the radius at point B, and the velocity at point A is $v$, what is the velocity at point B?

If the pressure difference across a capillary is doubled and the radius is halved, keeping other factors constant, the volume flow rate will become:

Which of the following factors does not directly affect the viscous force acting on a spherical object moving through a viscous fluid according to Stokes' Law?

Two identical capillaries of length 'L' and radius 'r' are connected in parallel. If the pressure difference across each capillary is 'ΔP', and the viscosity of the liquid is 'η', the total volume flow rate through the combination is:

A viscous liquid flows through a horizontal pipe of varying cross-section. At point A, the radius is 'r' and the velocity is 'v'. At point B, the radius is 'r/2'. Ignoring any energy losses due to viscosity, what is the pressure difference between points A and B?

According to Poiseuille's equation, the rate of flow of a liquid through a narrow tube is directly proportional to which power of the radius of the tube?

If the radius of a tube is doubled, while keeping all other factors constant, how will the flow rate of a liquid through the tube change according to Poiseuille's equation?

Which of the following factors does NOT directly affect the flow rate of a liquid according to Poiseuille's equation?

Poiseuille's equation is valid for which type of flow?