1. What is the relationship between pressure, density, and velocity in the Bernoulli
equation?
A. Pressure decreases with an increase in velocity
B. Pressure increases with an increase in velocity
C. Density and pressure are inversely related
D. Velocity and pressure are always constant
Answer: a) Pressure decreases with an increase in velocity
Rationale: According to Bernoulli’s principle, when the velocity of a fluid increases,
its pressure decreases, assuming the flow is steady and incompressible.
2. What is the purpose of a hydraulic jump in open channel flow?
A. To increase the velocity of the flow
B. To decrease the velocity of the flow
C. To stabilize the flow rate
D. To increase the Froude number
Answer: b) To decrease the velocity of the flow
,Rationale: A hydraulic jump occurs when supercritical flow transitions to subcritical
flow, leading to a sudden decrease in velocity and an increase in the flow depth.
3. What is the drag force experienced by an object in a fluid?
A. Force due to viscosity
B. Force due to surface tension
C. Force due to friction and pressure difference
D. Force due to buoyancy
Answer: c) Force due to friction and pressure difference
Rationale: Drag force arises from the interaction of the object with the fluid, due to
both viscous forces and pressure differences.
4. For a given fluid, the Reynolds number is 500. What type of flow is this likely to
indicate?
A. Laminar flow
B. Transitional flow
C. Turbulent flow
D. Steady flow
Answer: a) Laminar flow
, Rationale: For Reynolds numbers below about 2000, flow is usually laminar. A
Reynolds number of 500 suggests laminar flow.
5. Which of the following is the SI unit for viscosity?
A. Pascal
B. Newton-second per meter squared
C. Meter per second
D. Kilogram per meter per second
Answer: b) Newton-second per meter squared
Rationale: The SI unit of dynamic viscosity is the Newton-second per meter squared,
also called the pascal-second (Pa•s).
6. Which of the following methods is used to estimate the flow rate in a pipe using a
venturi meter?
A. Using Bernoulli's equation
B. Using the continuity equation
C. Using Poiseuille’s law
D. Using Reynolds number
Answer: a) Using Bernoulli's equation
equation?
A. Pressure decreases with an increase in velocity
B. Pressure increases with an increase in velocity
C. Density and pressure are inversely related
D. Velocity and pressure are always constant
Answer: a) Pressure decreases with an increase in velocity
Rationale: According to Bernoulli’s principle, when the velocity of a fluid increases,
its pressure decreases, assuming the flow is steady and incompressible.
2. What is the purpose of a hydraulic jump in open channel flow?
A. To increase the velocity of the flow
B. To decrease the velocity of the flow
C. To stabilize the flow rate
D. To increase the Froude number
Answer: b) To decrease the velocity of the flow
,Rationale: A hydraulic jump occurs when supercritical flow transitions to subcritical
flow, leading to a sudden decrease in velocity and an increase in the flow depth.
3. What is the drag force experienced by an object in a fluid?
A. Force due to viscosity
B. Force due to surface tension
C. Force due to friction and pressure difference
D. Force due to buoyancy
Answer: c) Force due to friction and pressure difference
Rationale: Drag force arises from the interaction of the object with the fluid, due to
both viscous forces and pressure differences.
4. For a given fluid, the Reynolds number is 500. What type of flow is this likely to
indicate?
A. Laminar flow
B. Transitional flow
C. Turbulent flow
D. Steady flow
Answer: a) Laminar flow
, Rationale: For Reynolds numbers below about 2000, flow is usually laminar. A
Reynolds number of 500 suggests laminar flow.
5. Which of the following is the SI unit for viscosity?
A. Pascal
B. Newton-second per meter squared
C. Meter per second
D. Kilogram per meter per second
Answer: b) Newton-second per meter squared
Rationale: The SI unit of dynamic viscosity is the Newton-second per meter squared,
also called the pascal-second (Pa•s).
6. Which of the following methods is used to estimate the flow rate in a pipe using a
venturi meter?
A. Using Bernoulli's equation
B. Using the continuity equation
C. Using Poiseuille’s law
D. Using Reynolds number
Answer: a) Using Bernoulli's equation
