Viscosity, Stokes law, terminal velocity, streamline and turbulent flow, critical velocity - Question Bank
1. Which of the following represents the correct relationship between streamline and turbulent flow?
2. If the density of the fluid and the radius of the sphere are kept constant, doubling the velocity of the sphere falling in a viscous fluid will:
3. The unit of viscosity in the CGS system is:
4. The resistance to flow in turbulent motion is generally:
5. When a fluid flows from a wide section of a pipe to a narrow section at constant volume flow rate, its velocity:
6. Stokes' Law is derived based on the assumption that the object is:
7. Which of the following conditions would lead to a higher critical velocity for fluid flow in a pipe?
8. The transition from laminar to turbulent flow is influenced by the shape of the object and the:
9. In the equation for terminal velocity (v_t = 2r²(ρ-σ)g / 9η), what does 'σ' represent?
10. A fluid is flowing through a pipe. If the flow is streamline, the velocity at any point in the fluid remains:
11. Which property of a fluid determines the magnitude of the force resisting the relative motion of adjacent layers?
12. The terminal velocity of a sphere falling in a viscous fluid is independent of:
13. If the velocity of a fluid in a pipe is increased beyond the critical velocity, the flow pattern changes from laminar to:
14. Stokes' Law is applicable for the motion of:
15. The critical velocity for flow through a pipe is generally lower for:
16. Which of the following is a direct consequence of turbulent flow?
17. The flow of blood in our arteries is typically:
18. Which phenomenon is directly related to the viscosity of the fluid through which an object moves?
19. If the density of a fluid increases, its kinematic viscosity will:
20. Kinematic viscosity is defined as the ratio of dynamic viscosity to:
21. The unit of kinematic viscosity is:
22. When a sphere falls in a fluid, the forces acting on it are gravity, buoyancy, and viscous drag. At terminal velocity, which of the following is true?
23. The coefficient of viscosity of liquids generally decreases with:
24. The coefficient of viscosity of gases generally increases with:
25. Which of the following is a characteristic of turbulent flow?
26. Poiseuille's law relates the flow rate of a viscous fluid through a pipe to pressure difference, viscosity, and pipe dimensions. The flow rate is inversely proportional to:
27. If the viscosity of a fluid decreases, what happens to the terminal velocity of a sphere falling through it, assuming other factors remain constant?
28. The relationship between the viscous force and velocity in streamline flow is:
29. The formula for Reynolds number is given by Re = (ρvD)/η, where ρ is density, v is velocity, D is characteristic length, and η is dynamic viscosity. What does a higher value of ρ indicate for the Reynolds number, assuming other factors are constant?
30. Which factor does NOT influence the critical velocity of a fluid in a pipe?
31. For a given pipe and fluid, if the velocity exceeds the critical velocity, the flow regime is likely to become:
32. Critical velocity is the velocity above which a fluid flow transitions from:
33. A high Reynolds number typically indicates:
34. The Reynolds number (Re) is a dimensionless quantity used to predict the type of fluid flow. What does a low Reynolds number generally indicate?
35. Which flow regime is associated with higher velocities and greater energy dissipation?
36. Turbulent flow is characterized by:
37. In streamline flow, the velocity of any fluid particle is:
38. Streamline flow is characterized by:
39. If the radius of a sphere is doubled, its terminal velocity in a given viscous fluid will increase by a factor of:
40. The terminal velocity of a sphere falling in a viscous fluid is directly proportional to:
41. When an object falls through a viscous fluid and reaches terminal velocity, its acceleration is:
42. Terminal velocity is reached when the net force acting on a falling object in a fluid is:
43. According to Stokes' Law, the viscous drag force on a sphere is directly proportional to:
44. In Stokes' Law (F = 6πηrv), what does 'η' represent?
45. Stokes' Law describes the viscous force acting on a sphere moving through a fluid. What is the formula for this force?
46. One Poise is equal to how many Pascal-seconds?
47. Which of the following is NOT a unit of viscosity?
48. The SI unit of the coefficient of viscosity is:
49. Viscosity is a measure of a fluid's internal resistance to:
50. Which of the following statements best defines viscosity?