Hydraulics and Fluid Mechanics Quiz model questions and answers

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1. Fluid is a substance that ____.
cannot be subjected to shear forces	always expands until it fills any container
has the same shear stress.at a point regardless of its motion	cannot remain at rest under action of any shear force

2. Fluid is a substance which offers no resistance to change of _____.
pressure	flow
shape	volume

3. Practical fluids
are viscous	possess surface tension
are compressible	possess all the above properties

4. In a static fluid
resistance to shear stress is small	fluid pressure is zero
linear deformation is small	only normal stresses can exist

5. A fluid is said to be ideal, if it is _____.
incompressible	inviscous
viscous and incompressible	inviscous and incompressible

6. An ideal flow of any fluid must fulfill the following _____.
Newton's law of motion	Newton's law of viscosity
Pascal law	Continuity equation

7. If no resistance is encountered by displacement, such a substance is known as ______.
fluid	water
gas	ideal fluid

8. The volumetric change of the fluid caused by a resistance is known as _____.
volumetric strain	volumetric index
compressibility	adhesion

9. Liquids ____.
cannot be compressed	occupy definite volume
are not affected by change in pressure and temperature	are not viscous

10. Density of water is maximum at _____.
0°C	0°K
4°C	100°C

11. The value of mass density in kgsecVm4 for water at 0°C is _____.
1	1000
100	101.9

12. Property of a fluid by which its own molecules are attracted is called ______.
adhesion	cohesion
viscosity	compressibility

13. Mercury does not wet glass. This is due to property of liquid known as _____.
adhesion	cohesion
surface tension	viscosity

14. The property of a fluid which enables it to resist tensile stress is known as ______.
compressibility	surface tension
cohesion	adhesion

15. Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called _____.
adhesion	cohesion
viscosity	compressibility

16. The specific weight of water is 1000 kg/m"
at norma] pressure of 760 mm	at 4°C temperature
at mean sea level	all the above

17. Specific weight of water in S.I. units is equal to _____.
1000 N/m3	10000 N/m3
9.81 xlO3 N/m3	9.81 xlO6N/m3

18. When the flow parameters at any given instant remain same at every point, then flow is said to be ____.
quasi static	steady state
laminar	uniform

19. Which of the following is demensionless
specific weight	specific volume
specific speed	specific gravity

20. The normal stress in a fluid will be constant in all directions at a point only if _____.
it is incompressible	it has uniform viscosity
it has zero viscosity	it is at rest