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Focused topic practice

hydraulics and fluid mechanics MCQs

Practise focused hydraulics and fluid mechanics questions with marked answers for exam preparation and subject revision.

hydraulics and fluid mechanics Mcqs
1. A perfect gas_________________?
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A. is incompressible

B. is of theoretical interest

C. none of the above

D. has zero viscosity

E. has constant viscosity

2. Surface tension has the units of____________________?
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A. newton m

B. newtons/m

C. new tons/m

D. newtons

E. newtons/m

3. A balloon lifting in air follows the following principle_________________?
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A. Archimedes principle

B. principle of buoyancy

C. all of the above

D. continuity equation

E. law of gravitation

4. If no resistance is encountered by displacement, such a substance is known as___________________?
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A. gas

B. fluid

C. ideal fluid

D. perfect solid

E. water

5. The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to _________________?
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A. 1000

B. 21,000.

C. 2700

D. 2100

E. 10,000

6. The normal stress in a fluid will be constant in all directions at a point only if_________________?
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A. it is at rest.

B. it is frictionless

C. it is incompressible

D. it has zero viscosity

E. it has uniform viscosity

7. An ideal flow of any fluid must fulfill the following______________?
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A. Continuity equation

B. Newtons law of viscosity

C. Boundary layer theory

D. Pascal law

E. Newtons law of motion

8. Property of a fluid by which its own molecules are attracted is called ________________?
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A. viscosity

B. surface tension

C. adhesion

D. compressibility

E. cohesion
9. The specific weight of water is 1000 kg/m _______________?
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A. at mean sea level

B. all the above

C. none of the above.

D. at 4C temperature

E. at norma] pressure of 760 mm

10. Specific weight of sea water is more that of pure water because it contains ________________?
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A. dissolved air

B. heavy water

C. suspended matter

D. all of the above

E. dissolved salt

11. The buoyancy depends on__________________?
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A. depth of immersion

B. pressure of the liquid displaced

C. viscosity of the liquid

D. none of the above.

E. mass of liquid displaced
12. The value of mass density in kgsecVm4 for water at 0C is_______________?
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A. 100

B. 1

C. 1000

D. 101.9

E. 91

13. Alcohol is used in manometer, because___________________?
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A. ose the wrong statement ?

14. Fluid is a substance which offers no resistance to change of_________________?
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A. pressure

B. flow

C. shape

D. volume

E. temperature

15. Units of surface tension are_________________?
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A. energy/unit area

B. distance

C. both of the above

D. it has no units

E. none of the above

16. If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be_________________?
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A. unpredictable

B. lower than the surface of liquid

C. none of the above

D. the same as the surface of liquid

E. higher than the surface of liquid

17. Liquids________________?
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A. occupy definite volume

B. GO are not viscous

C. none of the above

D. cannot be compressed

E. are not affected by change in pressure and temperature

18. Fluid is a substance that_______________?
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A. has the same shear stress.at a point regardless of its motion

B. flows

C. always expands until it fills any container

D. cannot be subjected to shear forces

E. cannot remain at rest under action of any shear force
19. A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm2 and a volume of 0.039 m3 at 150 kg/cm2. The bulk modulus of elasticity of liquid is _________________?
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A. 40 x 105 kg/cm2

B. none of the above

C. 40 x 106 kg/cm2

D. 4000 kg/cm2

E. 400 kg/cm2

20. Specific weight of water in S.I. units is equal to_________________?
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A. 9.81 N/m3

B. 9.81 xlO3 N/m3

C. 1000 N/m3

D. 9.81 xlO6N/m3

E. 10000 N/m3

21. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called________________?
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A. cohesion

B. surface tension

C. viscosity

D. adhesion

E. compressibility

22. Alcohol is used in manometers because_____________________?
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A. is provides suitable meniscus

B. it has low vapour pressure

C. it is clearly visible

D. it has low surface tension

E. it can provide longer column due to low density
23. Mercury does not wet glass. This is due to property of liquid known as_________________?
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A. viscosity

B. compressibility

C. adhesion

D. cohesion

E. surface tension
24. A fluid is said to be ideal, if it is________________?
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A. inviscous

B. incompressible

C. viscous and incompressible

D. inviscous and compressible

E. inviscous and incompressible
25. The bulk modulus of elasticity __________________?
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A. increases with pressure

B. is large when fluid is more compressible

C. is directly proportional to flow.

D. is independent of pressure and viscosity

E. has the dimensions of 1/pressure

26. Hot wire anemometer is used to measure_______________?
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A. discharge

B. pressure intensity of gas

C. velocity of gas

D. pressure intensity of liquid

27. The stress-strain relation of the newtoneon fluid is________________?
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A. inverse type

B. parabolic

C. none of the above

D. linear

E. hyperbolic

28. Free surface of a liquid tends to contract to the smallest possible area due to force of _________________?
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A. friction

B. surface tension

C. cohesion

D. adhesion

E. viscosity

29. Viscosity of water in comparison to mercury is ______________________?
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A. same

B. higher

C. higher/lower depending on temperature

D. lower

E. unpredictable.

30. The tendency of a liquid surface to contract is due to the following property_________________?
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A. cohesion

B. surface tension

C. viscosity

D. elasticity

E. adhesion

31. Falling drops of water become spheres due to the property of ________________?
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A. compressibility

B. surface tension

C. adhesion

D. viscosity

E. cohesion

32. The property of a fluid which enables it to resist tensile stress is known as________________?
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A. surface tension

B. cohesion

C. adhesion

D. viscosity.

E. compressibility

33. The ratio of absolute viscosity to mass density is known as____________________?
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A. viscosity index

B. coefficient of viscosity

C. kinematic viscosity

D. coefficient of compressibility

E. specific viscosity

34. A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury ?
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A. metal piece will sink to the bottom

B. whole of the metal piece will be immersed with its top surface just at mercury level

C. the metal piece will simply float over the mercury

D. none of the above

E. the metal piece will be immersed in mercury by half

35. The property of fluid by virtue of which it offers resistance to shear is called____________________?
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A. surface tension

B. adhesion

C. viscosity

D. all of the above

E. cohesion

36. The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be____________________?
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A. 2000 kg

B. 1500 kg

C. 1000 kg

D. 4000 kg.

E. 500 kg

37. Which of the following is dimensionless ________________?
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A. specific speed

B. specific weight

C. specific viscosity

D. specific gravity

E. specific volume

38. When the flow parameters at any given instant remain same at every point, then flow is said to be____________________?
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A. steady state

B. static.

C. uniform

D. quasi static

E. laminar

39. Dimensions of surface tension are_________________?
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A. MlLt

B. MlL2T2

C. MlL r2

D. MlLTx

E. MlLT2
40. The density of water is 1000 kg/m3 at __________________?
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A. 4C D. 20C

B. all temperature

C. 0C

D. 0K

41. In a static fluid__________________?
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A. only normal stresses can exist

B. fluid pressure is zero

C. linear deformation is small

D. viscosity is nil

E. resistance to shear stress is small

42. Density of water is maximum at ___________________?
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A. 0C

B. 100C

C. 0K

D. 4C

E. 20C.

43. The bulk modulus of elasticity with increase in pressure___________________?
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A. increases

B. remains constant

C. decreases

D. unpredictable

E. increases first upto certain limit and then decreases

44. For very great pressures, viscosity of moss gases and liquids __________________?
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A. decreases

B. shows erratic behaviour

C. increases

D. remains same

E. none of the above.

45. Kinematic viscosity is dependent upon________________?
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A. density

B. distance

C. pressure

D. level

E. flow

46. The increase of temperature results in_________________?
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A. increase in viscosity of gas

B. increase in viscosity of liquid

C. decrease in viscosity of gas

D. decrease in viscosity of liquid

E. A. and D. above

47. Which of the following meters is not associated with viscosity__________________?
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A. none of the above

B. Say bolt

C. Red wood

D. Orsat

E. Engler

48. The pressure at a point in a fluid will not be same in all the directions when the fluid is________________?
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A. inviscous and moving

B. viscous and moving

C. viscous

D. viscous and static

E. moving

49. Practical fluids____________________?
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A. possess all the above properties

B. are compressible

C. possess none of the above properties

D. possess surface tension

E. are viscous

50. An object having 10 kg mass weighs 9.81kg on a spring balance. The value of g at this place is___________________?
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A. 9.75 m/sec2

B. 10m/sec2

C. 9 m/sec .

D. 9.81 m/sec2

E. 10.2/m sec