Properties of Fluids topics include: Fluid mechanics basics and properties, viscosity, vapor pressure, compressibility and bulk modulus, fluids types, surface tension, capillarity and thermodynamic properties. Fluids are materials that easily succumb to shearing forces. Some properties of fluids include: Viscosity: The property of a fluid that resists the movement of one layer of fluid over another. Viscosity can make basic equations more difficult and can cause turbulence. Surface tension: The property of a fluid that makes its surface behave like a stretched elastic membrane. This... Show more

Properties of Fluids topics include: Fluid mechanics basics and properties, viscosity, vapor pressure, compressibility and bulk modulus, fluids types, surface tension, capillarity and thermodynamic properties.

Fluids are materials that easily succumb to shearing forces.

Some properties of fluids include:

Viscosity: The property of a fluid that resists the movement of one layer of fluid over another. Viscosity can make basic equations more difficult and can cause turbulence.
Surface tension: The property of a fluid that makes its surface behave like a stretched elastic membrane. This property comes from the cohesive forces between the fluid molecules at the surface.
Specific weight: The weight of a unit volume of a fluid. Specific weight is dependent on acceleration due to gravity.
Compressibility: A type of fluid whose density changes with the application of external force. Examples include gases and vapors.
Incompressibility: A fluid's density does not vary with the application of force. An example of an incompressible fluid is a stream of water flowing at high speed from a garden hose pipe. 

Other properties of fluids include:
Pressure
Density
Temperature
Flow velocity
Speed of sound

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Fluid Mechanics Practice Test: Properties of Fluids

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25 Questions

1. How do we measure the flow rate of liquid?

Ionization methodCoriolis methodDead weight methodConveyor method

2. The space between two plates (20cm*20cm*1cm), 1 cm apart, is filled with a liquid of viscosity 1 Poise. The upper plate is dragged to the right with a force of 5N keeping the lower plate stationary.

What will be the velocity in m/s of flow at a point 0.5 cm below the lower surface of the upper plate if linear velocity profile is assumed for the flow?

12.51.250.252.5

3. Which among these devices are the best suited for the measurement of high pressure liquids with high accuracy?

Manganin wire pressureIonization GaugeVacuum GaugeDead Weight Gauge

4. Which of the following equation correctly depicts the relation between the vapor pressure of a liquid and it’s temperature?

Vapor pressure increases rapidly with the increase in temperature of the liquid at low temperatures and the rate of increase goes low at higher temperaturesVapor pressure increases linearly with the increase in temperature of the liquidVapor pressure remains unchanged with the increase in temperature of the liquidVapor pressure increases slightly with the increase in temperature of the liquid at low temperatures and the rate of increase goes high at higher temperatures

5. The value of the Bulk Modulus of elasticity for an incompressible fluid is

very lowinfinityzerounity

6. What is the variation of cp, cv and k in case of gases when the temperature increases?

cp and cv increase with temperature, and k increasescp and cv decreases with temperature, and k increasescp and cv increase with temperature, and k decreasescp and cv decreases with temperature, and k decreases

7. Which of the following is the dimension of Bulk Modulus?

[M1L1T-1].[M1L-1T-2].[M1L1T-2].[M1L-1T-1].

8. What is the pressure in Pascals at a depth of 1m below the water surface?

98100 Pa980 Pa98 Pa1 Pa

9. Which of the following is the dimension of compressibility?

[M-1L1T2].[M1L1T-2].[M1L1T-1].[M-1L1T-2].

10. Which of the following is a shear-thinnning fluid?

DilatantBingham plasticRheopecticPseudoplastic

11. Which of the following is a shear-thickening fluid?

ThixotropicPseudoplasticDilatantBingham plastic

12. A gas weighs 16 N/m3 at 30℃ and at an absolute pressure of 0.35 N/mm². Determine the gas constant.

531.17708.23354.111062.34

13. Which one of the following is the correct relation between compressibility β and Bulk Modulus k

β = 2kβ = k/2β = 1/kβ = k

14. What type of liquids are measured using a manometer?

Medium LiquidsHeavy and light liquidsHeavy liquidsLight Liquids

15. What will be the diameter (in mm) of a water droplet, the pressure inside which is 0.05 N/cm² greater than the outside pressure? (Take surface tension as 0.075 N/m)

0.630.36

16. Which one of the following is the unit of specific weight?

N = msN = mN = m2N = m3

17. Which one of the following is the unit of mass density?

kg = m2kg = mskg = mkg = m3

18. The rise in the level of a liquid in a tube is h. If half the amount is poured outside, what will be the new rise in liquid level?

h/22h0h

19. The absolute pressure of a water is 0.5kN above it’s vapor pressure. If it flows with a velocity of 1m/s, what will be the value of Cavitation Number describing the flow induced boiling?

0.25210.5

20. The shear stress at a point in a liquid is found to be 0.03 N/m². The velocity gradient at the point is 0.15 s^-1. What will be it’s viscosity (in Poise)?

20.20.520

21. The viscous force the relative motion between the adjacent layers of a fluid in motion.
Which one of the flowing fits best in the sentence?

may effect under certain conditionsfacilitatesnever affectsopposes

22. Which of the following is correct regarding the formation and collapse of vapor bubbles in a liquid?

Vapor bubbles are formed when the fluid pressure drops below the vapor pressure and collapses when the fluid pressure goes above the bubble pressureVapor bubbles are formed when the fluid pressure goes above the vapor pressure and collapses when the fluid pressure goes above the bubble pressureVapor bubbles are formed when the fluid pressure drops below the vapor pressure and collapses when the fluid pressure goes below the bubble pressureVapor bubbles are formed when the fluid pressure goes above the vapor pressure and collapses when the fluid pressure goes below the bubble pressure

23. Specific gravity is what kind of property?

ExtensiveNone of the mentionedIntensiveIt depends on external conditions

24. Two horizontal plates placed 250mm have an oil of viscosity 20 poises. Calculate the shear stress in oil if upper plate is moved with velocity of 1250mm/s.

None of the mentioned10 N/m22 N/m220 N/m2

25. Which of the following is the condition for the boiling of a liquid?

Absolute pressure of a liquid must be greater than or equal to it’s vapor pressureAbsolute pressure of a liquid must be equal to it’s vapor pressureAbsolute pressure of a liquid must be less than or equal to it’s vapor pressureAbsolute pressure of a liquid must be greater than it’s vapor pressure