1. What does the hydrostatic pressure in a fluid depend on?
A. The density of the fluid
B. The velocity of the fluid
C. The surface tension
D. The temperature of the fluid
Answer: a) The density of the fluid
Rationale: Hydrostatic pressure is directly proportional to the density of the fluid and
the height of the fluid column above the point of measurement.
2. Which of the following equations is used to calculate the velocity of a fluid flowing
through a pipe with constant cross-section?
A. Continuity equation
B. Bernoulli’s equation
C. Poiseuille's law
D. Darcy-Weisbach equation
Answer: a) Continuity equation
,Rationale: The continuity equation states that the mass flow rate must be constant in a
pipe with constant cross-section, relating velocity and pipe area.
3. Which of the following is the primary cause of fluid resistance in pipe flow?
A. Surface tension
B. Viscosity of the fluid
C. Fluid density
D. Gravity
Answer: b) Viscosity of the fluid
Rationale: Viscosity, or the internal friction within the fluid, is the main factor
responsible for resistance in pipe flow.
4. 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
, Rationale: Bernoulli’s equation is used to relate the pressure difference and the
velocity change in a venturi meter, allowing the flow rate to be calculated.
5. If the velocity of a fluid doubles, what happens to the kinetic energy per unit mass?
A. It doubles
B. It quadruples
C. It halves
D. It stays the same
Answer: b) It quadruples
Rationale: Kinetic energy per unit mass is given by 12v2\frac{1}{2} v^221v2. If
velocity vvv doubles, the kinetic energy increases by a factor of four.
6. In fluid mechanics, what does Bernoulli’s principle state?
A. Total energy in a fluid remains constant if the flow is steady and incompressible
B. Pressure in a fluid is directly proportional to velocity
C. The viscosity of a fluid is constant at all velocities
D. Fluid flow is always turbulent
Answer: a) Total energy in a fluid remains constant if the flow is steady and
incompressible
A. The density of the fluid
B. The velocity of the fluid
C. The surface tension
D. The temperature of the fluid
Answer: a) The density of the fluid
Rationale: Hydrostatic pressure is directly proportional to the density of the fluid and
the height of the fluid column above the point of measurement.
2. Which of the following equations is used to calculate the velocity of a fluid flowing
through a pipe with constant cross-section?
A. Continuity equation
B. Bernoulli’s equation
C. Poiseuille's law
D. Darcy-Weisbach equation
Answer: a) Continuity equation
,Rationale: The continuity equation states that the mass flow rate must be constant in a
pipe with constant cross-section, relating velocity and pipe area.
3. Which of the following is the primary cause of fluid resistance in pipe flow?
A. Surface tension
B. Viscosity of the fluid
C. Fluid density
D. Gravity
Answer: b) Viscosity of the fluid
Rationale: Viscosity, or the internal friction within the fluid, is the main factor
responsible for resistance in pipe flow.
4. 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
, Rationale: Bernoulli’s equation is used to relate the pressure difference and the
velocity change in a venturi meter, allowing the flow rate to be calculated.
5. If the velocity of a fluid doubles, what happens to the kinetic energy per unit mass?
A. It doubles
B. It quadruples
C. It halves
D. It stays the same
Answer: b) It quadruples
Rationale: Kinetic energy per unit mass is given by 12v2\frac{1}{2} v^221v2. If
velocity vvv doubles, the kinetic energy increases by a factor of four.
6. In fluid mechanics, what does Bernoulli’s principle state?
A. Total energy in a fluid remains constant if the flow is steady and incompressible
B. Pressure in a fluid is directly proportional to velocity
C. The viscosity of a fluid is constant at all velocities
D. Fluid flow is always turbulent
Answer: a) Total energy in a fluid remains constant if the flow is steady and
incompressible
