What is the value of Reynolds number for turbulent flow?

What is the value of Reynolds number for streamline flow?

Two capillary tubes of the same length but different radii $r_1$ and $r_2$ are fitted in parallel to the bottom of a vessel. The pressure head is $P$. What should be the radius of a single tube that can replace the two tubes so that the rate of flow is the same as before?

Which of the ratio of forces represents the Reynolds number $Re$?

The flow rate of water from a tap of diameter $1.25 \text{ cm}$ is $3 \text{ litres per min}$. If the coefficient of viscosity of water is $10^{-3} \text{ Pa-s}$,the nature of the flow is:

What is critical velocity? Write a formula for critical velocity.