- 1. Fluid dynamics is the study of the behavior of liquids and gases in motion. It deals with how fluids flow, how they interact with boundaries, objects, and other fluids, and how their properties like velocity, pressure, and density vary in different conditions. Fluid dynamics has applications in various fields such as engineering, meteorology, biology, and oceanography, helping us understand phenomena like ocean currents, airflow around aircraft, blood flow in the human body, and weather patterns. By predicting and analyzing fluid behavior, researchers and engineers can develop better designs, optimize processes, and solve practical problems in a wide range of industries.
What is the study of fluid dynamics concerned with?
A) The study of animal behavior
B) The motion of liquids and gases
C) The properties of solid materials
D) The behavior of light waves
- 2. Which physical property describes a fluid's resistance to flow?
A) Viscosity
B) Temperature
C) Pressure
D) Density
- 3. What does Bernoulli's Principle state?
A) Fluid pressure always increases with speed
B) The pressure of a fluid is constant at all speeds
C) As the speed of a fluid increases, its pressure decreases
D) Pressure and speed of a fluid are unrelated
- 4. Which law describes the relationship between the pressure and volume of a gas?
A) Avogadro's Law
B) Charles's Law
C) Gay-Lussac's Law
D) Boyle's Law
- 5. What is the phenomenon where fluid flows in parallel layers with no disruption between them?
A) Laminar flow
B) Unsteady flow
C) Steady flow
D) Turbulent flow
- 6. Which device is commonly used to measure fluid velocity?
A) Manometer
B) Pitot tube
C) Flow meter
D) Hydrometer
- 7. What is the dimensionless quantity that represents the ratio of inertial forces to viscous forces in a fluid?
A) Froude number
B) Mach number
C) Reynolds number
D) Friction factor
- 8. What type of flow pattern is chaotic and irregular?
A) Unsteady flow
B) Turbulent flow
C) Steady flow
D) Laminar flow
- 9. Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?
A) Charles's Law
B) Avogadro's Law
C) Gay-Lussac's Law
D) Boyle's Law
- 10. How does adding impurities affect the viscosity of a fluid?
A) Increases viscosity
B) No effect on viscosity
C) Decreases viscosity
D) Causes fluid to solidify
- 11. What is the relationship between fluid pressure and fluid depth in a stationary fluid?
A) Pressure varies randomly with depth
B) Pressure is constant at all depths
C) Pressure decreases with depth
D) Pressure increases with depth
- 12. What is the difference between dynamic viscosity and kinematic viscosity?
A) Dynamic viscosity divided by fluid density
B) Dynamic viscosity multiplied by fluid density
C) Dynamic viscosity squared
D) There is no difference
- 13. What effect causes water to rise inside a thin tube inserted into a liquid?
A) Capillary action
B) Evaporation
C) Buoyancy
D) Surface tension
- 14. What is the type of flow where the fluid velocity at any point does not change with time?
A) Turbulent flow
B) Laminar flow
C) Irregular flow
D) Steady flow
- 15. What term is used to describe the force that a fluid exerts on an object moving through it?
A) Drag
B) Lift
C) Buoyancy
D) Tension
- 16. What phenomenon occurs when a fluid flows past an object and the flow is disturbed, causing swirling and eddies?
A) Stagnation
B) Laminar flow
C) Vortex shedding
D) Turbulence
- 17. What is the name for the point at which the velocity of a fluid becomes zero during flow around an object?
A) Stagnation point
B) Vortex point
C) Cavitation point
D) Boundary point
- 18. What phenomenon occurs when the pressure in a flowing fluid drops below the vapor pressure, causing the formation of vapor bubbles?
A) Turbulence
B) Evaporation
C) Cavitation
D) Capillarity
- 19. What is the negative effect of cavitation in fluid systems?
A) Reduced noise levels
B) Increased flow efficiency
C) Improved heat transfer
D) Erosion and damage to equipment
- 20. What is the SI unit of viscosity?
A) Newton per meter
B) Pascal-second
C) Meter squared per second
D) Kilogram per cubic meter
- 21. What is the SI unit of pressure?
A) Joule
B) Pascal
C) Watt
D) Newton
- 22. What is the formula for calculating dynamic pressure in a fluid flow?
A) 0.5 * ρ * V2
B) P = ρ * V
C) P = F / A
D) P = ρ g h
- 23. What is the principle behind a siphon's ability to transfer fluid from one container to another?
A) Surface tension
B) Heat conduction
C) Atmospheric pressure
D) Capillarity effect
- 24. Bernoulli's equation relates the conservation of what quantity in fluid flow?
A) Momentum
B) Energy
C) Volume
D) Mass
- 25. Which law states that the velocity of a fluid increases as the pressure of the fluid decreases?
A) Charles' law
B) Pascal's principle
C) Bernoulli's principle
D) Newton's third law
- 26. What is the term for the force that opposes the relative motion of solid surfaces in contact with each other, within a fluid layer?
A) Buoyancy
B) Turbulence
C) Frictional drag
D) Lift
- 27. What is the force per unit area required to keep a fluid flowing?
A) Volumetric flow rate
B) Shear stress
C) Surface tension
D) Pressure gradient
- 28. What is the unit of dynamic viscosity in the SI system?
A) N/m2
B) Pa s
C) m2/s
D) Kg/m3
- 29. What is the formula for calculating shear stress in a fluid?
A) τ = ρ * V
B) τ = F / A
C) τ = ρ * g * h
D) τ = μ * du/dy
- 30. What is the term for the energy lost due to fluid friction and turbulence?
A) Bernoulli's loss
B) Friction drag
C) Energy deficit
D) Head loss
- 31. What is the phenomenon where a fluid flows faster through a narrowed section of a pipe, causing a decrease in pressure?
A) Venturi effect
B) Cavitation
C) Diffusion
D) Shock wave
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