1. What does Reynolds' Number characterize in fluid dynamics?
a) Fluid viscosity
b) Flow turbulence
c) Pressure drop
d) Fluid density
2. Which equation is used to calculate Reynolds' Number (Re)?
a) F = ma
b) E = mc^2
c) Re = (ρuL) / μ
d) P = VI
3. Reynolds' Number is a dimensionless quantity. What does this mean?
a) It has no units.
b) It is very small.
c) It is related to the dimensions of a fluid.
d) It has units but no numerical value.
4. In the Reynolds' Number equation, what does 'ρ' represent?
a) Radius
b) Density of the fluid
c) Flow rate
d) Velocity
5. When Reynolds' Number is less than 2000, the flow is typically:
a) Laminar
b) Turbulent
c) Supersonic
d) Hypersonic
6. In fluid dynamics, a higher Reynolds' Number indicates:
a) Slower flow
b) More viscous fluid
c) Greater potential for turbulence
d) Lower pressure
7. Which of the following is true regarding the critical Reynolds' Number?
a) It depends on the fluid properties.
b) It is always around 1000.
c) It is independent of the flow geometry.
d) It marks the transition from laminar to turbulent flow.
8. What is the typical range for Reynolds' Numbers encountered in everyday life?
a) 0.1 to 1
b) 10 to 100
c) 1000 to 10,000
d) 1,000,000 to 10,000,000
9. In a pipe flow, if the Reynolds' Number increases, what can be expected to happen to the flow?
a) It becomes more laminar.
b) It becomes less turbulent.
c) It remains unchanged.
d) It becomes more turbulent.
10. Which factor has the most significant influence on Reynolds' Number in a fluid flow?
a) Pipe diameter
b) Flow velocity
c) Fluid density
d) Fluid viscosity
