MTH642 Quiz 1

Q1. Which of the following is NOT an internal flow?

1. water flow in a pipe
2. unbounded fluid flow over the surface of a wire
3. liquid flow between the two parallel plates
4. hot gas flow in a duct

Correct answer: unbounded fluid flow over the surface of a wire

Q2. The friction between the fluid layers causes the fluid velocity to

1. increase
2. decrease

Correct answer: decrease

Q3. In steady flow, ____.

1. properties gradually change with time.
2. properties do not change with time
3. velocity does not change
4. pressure changes

Correct answer: properties do not change with time

Q4. The unit of velocity is _____.

1. m-1s
2. ms
3. ms-1
4. m-1s-1

Correct answer: ms-1

Q5. Which one of the following is NOT a secondary dimension?

1. Velocity
2. Temperature
3. Momentum
4. Acceleration

Correct answer: Temperature

Q6. In inviscid flow region, the viscous forces are negligibly small compared to____.

1. inertial or pressure forces
2. Both
3. and (c)
4. gravitational forces
5. buoyant forces

Correct answer: inertial or pressure forces

Q7. The boundary layer is developed very close to the wall by flowing fluid due to _____.

1. Surface Tension
2. Viscosity
3. Gravity
4. Density

Correct answer: Viscosity

Q8. The substance in liquid or gas phase is referred as

1. plasma
2. electrolyte
3. ions
4. fluid

Correct answer: fluid

Q9. Which of the following may NOT have a free surface?

1. An open container filled with oil
2. An open container filled with water
3. An open container filled with liquid mercury
4. An open container filled with hydrogen gas

Correct answer: An open container filled with hydrogen gas

Q10. The flow of an unbounded fluid over a surfacel is classified as being _____.

1. forced flow
2. external flow
3. natural flow
4. internal flow

Correct answer: external flow