1. What is the definition of fluid in the context of fluid mechanics?
A. A substance that flows under the action of a force
B. A substance that does not have a definite shape
C. A substance that has a fixed volume
D. A substance that resists deformation
Answer: a) A substance that flows under the action of a force
Rationale: Fluids are materials that flow and have no fixed shape, only volume. This
makes them deformable when subjected to a force.
2. What is the primary purpose of a siphon in fluid mechanics?
A. To transfer fluid from one container to another using atmospheric pressure
B. To increase fluid velocity
C. To reduce the pressure of a fluid
D. To measure the flow rate of a fluid
Answer: a) To transfer fluid from one container to another using atmospheric pressure
Rationale: A siphon works by using atmospheric pressure to move fluid from a higher
container to a lower one.
,3. What is the purpose of a venturi meter?
A. To measure fluid velocity
B. To measure fluid pressure
C. To measure fluid temperature
D. To measure fluid density
Answer: a) To measure fluid velocity
Rationale: A venturi meter is used to measure fluid velocity by exploiting changes in
pressure and cross-sectional area.
4. 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.
, 5. In laminar flow, the relationship between the pressure drop and flow rate in a pipe
is:
A. Directly proportional
B. Inversely proportional
C. Exponential
D. Independent of each other
Answer: a) Directly proportional
Rationale: In laminar flow, the pressure drop across a pipe is directly proportional to
the flow rate.
6. Which of the following factors does NOT affect the velocity of sound in a fluid?
A. Fluid density
B. Fluid temperature
C. Fluid pressure
D. Fluid velocity
Answer: d) Fluid velocity
Rationale: The velocity of sound is affected by the fluid's density and temperature, but
not by its flow velocity. For compressible fluids, it also depends on the fluid's
pressure.
A. A substance that flows under the action of a force
B. A substance that does not have a definite shape
C. A substance that has a fixed volume
D. A substance that resists deformation
Answer: a) A substance that flows under the action of a force
Rationale: Fluids are materials that flow and have no fixed shape, only volume. This
makes them deformable when subjected to a force.
2. What is the primary purpose of a siphon in fluid mechanics?
A. To transfer fluid from one container to another using atmospheric pressure
B. To increase fluid velocity
C. To reduce the pressure of a fluid
D. To measure the flow rate of a fluid
Answer: a) To transfer fluid from one container to another using atmospheric pressure
Rationale: A siphon works by using atmospheric pressure to move fluid from a higher
container to a lower one.
,3. What is the purpose of a venturi meter?
A. To measure fluid velocity
B. To measure fluid pressure
C. To measure fluid temperature
D. To measure fluid density
Answer: a) To measure fluid velocity
Rationale: A venturi meter is used to measure fluid velocity by exploiting changes in
pressure and cross-sectional area.
4. 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.
, 5. In laminar flow, the relationship between the pressure drop and flow rate in a pipe
is:
A. Directly proportional
B. Inversely proportional
C. Exponential
D. Independent of each other
Answer: a) Directly proportional
Rationale: In laminar flow, the pressure drop across a pipe is directly proportional to
the flow rate.
6. Which of the following factors does NOT affect the velocity of sound in a fluid?
A. Fluid density
B. Fluid temperature
C. Fluid pressure
D. Fluid velocity
Answer: d) Fluid velocity
Rationale: The velocity of sound is affected by the fluid's density and temperature, but
not by its flow velocity. For compressible fluids, it also depends on the fluid's
pressure.
