Viscosity MCQs Quiz Multiple Choice Questions & Answers

1. What is Viscosity?

1. A fluids colour
2. A fluids temperature
3. A fluids resistance to flow
4. None of these

2. Poise is the unit of

1. Mass density
2. Kinematic viscosity
3. viscosity
4. velocity gradient

3. Viscosity of water in comparison to mercury is

1. Higher
2. Lower
3. Same
4. Higher/lower depending on temperature

4. Excessive friction takes place when the viscosity is

1. Too high
2. Too low
3. Moderate
4. Zero

5. 1 Stoke is equal to

1. 10 centi stokes
2. 100 centi stokes
3. 1000 centi stokes
4. None of these

6. A fluid having no viscosity is known as

1. Real fluid
2. Ideal fluid
3. Super fluid
4. None of these

7. A fluid which obeys the Newtons law of viscosity is termed as

1. Real fluid
2. Ideal fluid
3. Newtonian fluid
4. Non Newtonian fluid

8. Fluids with very high viscosity flow very.........

1. fast
2. slow
3. dont flow
4. none of these

9. The best example of a substance with low viscosity is?

1. Honey
2. Soap
3. Marbles
4. Water

10. The viscosity of a fluid in motion is 1 poise

1. 0.5
2. 1
3. 2

11. The viscosity of an oil decrease when temperature

1. Decreases
2. Is constant
3. Increases
4. 100<>sup>oC

12. The viscosity of petroleum oil for hydraulic lifts is

1. High
2. Low
3. Moderate
4. Very high

13. Viscous force between the two layers having unit area and unit velocity gradient.

1. Coefficient of viscosity
2. Surface tension
3. Elasticity
4. None of the above

14. What do you call the resistance of a liquid to flow?

1. volume
2. mass
3. viscosity
4. fluidity

15. What happens to the viscosity of liquid with the increase in temperature?

1. It increases
2. It decreases
3. It may increase or decrease
4. No change

16. What is the S.I. unit of viscosity?

1. Candela
2. Poise
3. Newton
4. No unit

17. Which of the following liquids is viscous?

1. honey
2. water
3. Petrol
4. cooking oil

18. Which of the following represents viscosity?

1. Potential energy stored in fluid
2. Resistance to fluid motion
3. Roughness of the surface
4. The pressure difference between the two fluids

19. Which of these are fluids?

1. Oxygen
2. Water
3. Rocks
4. Both A & B

20. Which of these factors affects Viscosity?

1. Temperature
2. Colour
3. Taste
4. None of these

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?

1. opposes
2. never affects
3. facilitates
4. may effect under certain conditions

22. What is the correct definition of a pseudoplastic liquid?

1. A liquid which becomes less viscous as the rate of shear increases
2. A liquid which becomes more viscous as the rate of shear increases
3. A liquid which becomes less viscous over time when a constant shear stress is applied
4. A liquid which becomes more viscous over time when a constant shear stress is applied

23. What is the correct definition of solubility?

1. The ability of solid particles to disperse throughout a liquid continuous phase
2. The ability of a solute to dissolve into a solvent
3. The rate at which a solute dissolves into a solvent
4. The ability of immiscible liquid droplets to disperse within a second liquid phase

24. Which of the following correctly states how the viscosities of a liquid and a gas will change with temperature?

1. Viscosity increases with the increase in temperature of a liquid and decreases with the increase in temperature of a gas
2. Viscosity increases with the increase in temperature of a liquid and increases with the increase in temperature of a gas
3. Viscosity decreases with the increase in temperature of a liquid and decreases with the increase in temperature of a gas
4. Viscosity decreases with the increase in temperature of a liquid and increases with the increase in temperature of a gas

25. Which property measures the resistance of a liquid to flow?

1. Density
2. Viscosity
3. Volume
4. Solubilit