Viscosity and Flow Practice
10 problems · instant feedback · full explanations
Viscosity is a fluid's internal friction. Slow, smooth flow is laminar; fast, chaotic flow is turbulent — the Reynolds number decides.
Q1.
A fluid's resistance to flow is called:
Multiple choice · Easy
Q2.
Which of the following best describes laminar flow?
Multiple choice · Easy
Q3.
Water (ρ=1000, μ=0.001) flows at 2 m/s in a 0.1 m pipe. What is the Reynolds number?
Numerical answer · Medium
Q4.
Below what Reynolds number is pipe flow typically laminar?
Multiple choice · Medium
Q5.
A 0.01 m radius sphere falls at 0.5 m/s through oil (η = 0.1 Pa·s). What is the Stokes drag force? (N)
Numerical answer (N) · Hard
Q6.
A sphere reaches terminal velocity in oil when:
Multiple choice · Medium
Q7.
Heating a liquid generally decreases its viscosity.
True / False · Easy
Q8.
Turbulent flow always has lower drag than laminar flow.
True / False · Medium
Q9.
If a pipe radius doubles (same pressure drop), by what factor does flow rate increase?
Numerical answer (×) · Hard
Q10.
Which flow is most likely laminar?
Multiple choice · Hard