hydraulics and fluid mechanics MCQs – Page 2

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

hydraulics and fluid mechanics Mcqs

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 __________________?
0

A. 4C D. 20C

B. all temperature

C. 0C

D. 0K

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