MTH642 Final Term Quiz Spring 2026

MTH642 - Fluid Mechanics Finalterm latest quiz spring 2026

Section 1: Bernoulli’s Equation and Applications

Q1. According to Bernoulli's principle for an ideal fluid, as the speed of the fluid increases, the pressure:

1. Increases
2. Decreases
3. Remains constant
4. Becomes zero

Correct answer: Decreases

Correct option: b

Q2. The mathematical proportionality relating pressure 𝑃to velocity 𝑣in a moving fluid is:

1. 𝑃∝

𝑣 d) 𝑃∝ 𝑣2

Correct option: c

Q3. In a constricted artery, the flow speed increases, causing the internal pressure to:

1. Increase
2. Stay the same
3. Drop, potentially causing collapse
4. Double

Correct answer: Drop, potentially causing collapse

Correct option: c

Q4. Which of the following is NOT an application of Bernoulli’s equation?

1. Flight of an airplane
2. Perfume spray
3. Venturi effect
4. Melting point of ice

Correct answer: Melting point of ice

Correct option: d

Q5. Bernoulli’s equation is valid for:

1. Viscous fluids
2. Ideal fluids
3. Turbulent flow only
4. All real fluids

Correct answer: Ideal fluids

Correct option: b

Q6. The SI unit of pressure (Pa) is equivalent to:

1. J·m
2. J/m²
3. J/m³
4. N·m

Correct answer: J/m³

Correct option: c

Q7. The term

1. Potential energy density
2. Kinetic energy per unit volume
3. Static pressure
4. Internal energy

Correct answer: Kinetic energy per unit volume

Correct option: b

a) Kinetic energy

b) Gravitational potential energy per unit volume

c) Viscous drag d) Elastic energy

Correct option: b

Q9. Bernoulli’s Principle explains that lift in birds and planes is mainly generated:

1. Above the cockpit
2. In the tail
3. Under the wings
4. In the engine

Correct answer: Under the wings

Correct option: c 10. On the top of an airfoil, air typically has:

a) Higher speed and lower pressure

b) Lower speed and higher pressure c) No airflow d) High pressure and high speed

Correct option: a 11. On the bottom of an airfoil, air typically has: a) Higher speed and lower pressure

b) Lower speed and higher pressure

c) Vacuum d) Atmospheric pressure only

Correct option: b 12. A car spoiler is best described as: a) A type of engine

b) A reversed airfoil

c) A fuel stabilizer d) A braking device

Correct option: b 13. In a viscous fluid flowing through a pipe, pressure gradually: a) Increases