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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