Hydraulic and fluid mechanics IMP MCQ PART-2
01. The viscosity of a liquid is due to
A. cohesion of its particles.
02. A weir is usually made of
A. masonry or concrete.
03. The shear stress‐strain graph for a newtonian fluid is a
A.straight line
04. Water is __________ liquid.
A.an incompressible.
05. The specific weight of sea water is __________ that of pure water.
A.more than
06. The velocity corresponding to Reynold number of 2000 is called
A.lower critical velocity.
07. The flow in a pipe is laminar, when Reynold number is.
A. less than 2000.
08. Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
A.internal.
09. The flow in a pipe is neither laminar nor turbulent when Reynold number is
A.between 2000 and 2800.
10. According to Pascal's law, the intensity of pressure at any point in a fluid at rest
A. is the same in all directions.
11. The ratio of the inertia force to the surface tension force is called
A. Weber's number.
12. The buoyancy depends upon the
A.weight of the liquid displaced
13. The total energy line lies over the centre line of the pipe by an amount equal to
A.pressure head + velocity head.
14. A piezometer tube is used only for measuring
A.moderate pressure.
15. The flow in a pipe is turbulent when Reynold number is
A.more than 2800.
16. Euler's number is the ratio of __________ force to pressure force.
A.inertia.
17. The weight per unit volume of a liquid at a standard temperature and pressure is called
A.specific weight.
18. Coefficient of contraction is the ratio of
A.area of jet at vena contracta to the area of orifice.
19. In a free nappe,
A.the pressure below the nappe is atmospheric.
20. The Reynold's number of a ship is __________ to its velocity and length.
A.directly proportional.
21. According to equation of continuity,
C.a1v1 = a2v2.
22. In a venturimeter, the velocity of liquid at throat is __________ than at inlet.
A.higher.
23. The maximum efficiency of transmission through a pipe is
A.66.67%
24. An ideal fluid is
A. frictionless and incompressible.
25. A manometer is used to measure
A.high pressure
26. A siphon is used to connect two reservoirs at different levels
A. intervened by a high ridge.
27. The pressure measured with the help of a piezometer tube is in
A.head of liquid.
28. The length of the divergent cone in a venturimeter is __________ that of the convergent cone.
A.three to four times.
29. A flow through a long pipe at constant rate is called
A.steady uniform flow.
30. The unit of dynamic viscosity in S.I. units is
B.N-s/m2
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