FLUID MECHANICS: FUNDAMENTALS
AND APPLICATIONS COMPREHENSIVE
EXAM (CHAPTERS 1-15) QUESTIONS
AND ANSWERS
1. Which of the following properties is considered intensive in a fluid system?
A. Total Mass
B. Temperature
C. Total Volume
D. Total Internal Energy
Answer: B
Conceptual Explanation: Intensive properties are independent of the mass of the system.
Temperature, pressure, and density are intensive, whereas mass and total energy are
extensive.
2. For a Newtonian fluid, how does the shear stress behave relative to the rate of
deformation?
A. It is inversely proportional to the rate of deformation.
,B. It is independent of the rate of deformation.
C. It is proportional to the square of the rate of deformation.
D. It is linearly proportional to the rate of deformation.
Answer: D
Conceptual Explanation: In Newtonian fluids, the shear stress is linearly proportional to
the velocity gradient (rate of deformation), with the constant of proportionality being the
dynamic viscosity.
3. What happens to the dynamic viscosity of a liquid as the temperature increases?
A. It remains constant.
B. It increases linearly.
C. It decreases.
D. It increases exponentially.
Answer: C
Conceptual Explanation: In liquids, viscosity is dominated by intermolecular cohesive
forces, which weaken as temperature increases, leading to a decrease in viscosity.
4. A U-tube manometer contains two different liquids. If the pressure at one end is increased,
the displacement of the interface depends on:
A. The difference in densities between the two liquids.
B. Only the density of the lighter liquid.
, C. The local atmospheric pressure.
D. Only the density of the heavier liquid.
Answer: A
Conceptual Explanation: According to the hydrostatic equation, the pressure difference is
proportional to the difference in density times gravity times the height difference.
5. As a submerged vertical plane surface is pushed deeper into a liquid, the distance between
the center of pressure and the centroid of the surface:
A. Decreases.
B. Increases.
C. Remains constant.
D. Depends on the density of the liquid.
Answer: A
Conceptual Explanation: The distance between the center of pressure and the centroid is
given by I/(y_c * A). As the depth y_c increases, this distance decreases.
6. A body floats in a stable equilibrium if its metacentric height (MG) is:
A. Positive.
B. Negative.
C. Zero.
AND APPLICATIONS COMPREHENSIVE
EXAM (CHAPTERS 1-15) QUESTIONS
AND ANSWERS
1. Which of the following properties is considered intensive in a fluid system?
A. Total Mass
B. Temperature
C. Total Volume
D. Total Internal Energy
Answer: B
Conceptual Explanation: Intensive properties are independent of the mass of the system.
Temperature, pressure, and density are intensive, whereas mass and total energy are
extensive.
2. For a Newtonian fluid, how does the shear stress behave relative to the rate of
deformation?
A. It is inversely proportional to the rate of deformation.
,B. It is independent of the rate of deformation.
C. It is proportional to the square of the rate of deformation.
D. It is linearly proportional to the rate of deformation.
Answer: D
Conceptual Explanation: In Newtonian fluids, the shear stress is linearly proportional to
the velocity gradient (rate of deformation), with the constant of proportionality being the
dynamic viscosity.
3. What happens to the dynamic viscosity of a liquid as the temperature increases?
A. It remains constant.
B. It increases linearly.
C. It decreases.
D. It increases exponentially.
Answer: C
Conceptual Explanation: In liquids, viscosity is dominated by intermolecular cohesive
forces, which weaken as temperature increases, leading to a decrease in viscosity.
4. A U-tube manometer contains two different liquids. If the pressure at one end is increased,
the displacement of the interface depends on:
A. The difference in densities between the two liquids.
B. Only the density of the lighter liquid.
, C. The local atmospheric pressure.
D. Only the density of the heavier liquid.
Answer: A
Conceptual Explanation: According to the hydrostatic equation, the pressure difference is
proportional to the difference in density times gravity times the height difference.
5. As a submerged vertical plane surface is pushed deeper into a liquid, the distance between
the center of pressure and the centroid of the surface:
A. Decreases.
B. Increases.
C. Remains constant.
D. Depends on the density of the liquid.
Answer: A
Conceptual Explanation: The distance between the center of pressure and the centroid is
given by I/(y_c * A). As the depth y_c increases, this distance decreases.
6. A body floats in a stable equilibrium if its metacentric height (MG) is:
A. Positive.
B. Negative.
C. Zero.
