FLUID MECHANICS MCQ.
1.Fluid is a substance which offers no resistance to change of
shape.
2.An ideal flow of any fluid must fulfill the following
Continuity equation.
3.Density of water is maximum at
4ºC.
4.Units of mass density are
kg/m3.
5.Property of a fluid by which its own molecules are attracted is called
cohesion.
6.Mercury does not wet glass. This is due to property of liquid known as
surface tension.
7.Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
adhesion.
8.The specific weight of water is
1000 kg/m3
at normal pressure of 760 mm
at 4ºC temperature
at mean sea level
all the above.
9.The pressure at a point in a fluid will not be same in all the directions when the fluid is
viscous and moving.
10.The surface tension of mercury at normal temperature compared to that of water is
more.
11.The ratio of absolute viscosity to mass density is known as
kinematic viscosity.
12.The property of fluid by virtue of which it offers resistance to shear is called
viscosity.
13.For manometer, a better liquid combination is one having
higher surface tension.
14.Units of surface tension are
Newton per metre.
15.The stress-strain relation of the Newtonian fluid is
linear.
16.Surface tension
acts in the plane of the interface normal to any line in the surface.
17.Surface tension has the units of
newtons/m.
18.A balloon lifting in air follows the following principle
law of gravitation
Archimedes principle
principle of buoyancy
all of the above.
19.Viscosity of water in comparison to mercury is
higher.
20.The flow of fluid through a pipe is laminar when
the Reynolds number is less than 2000.
21.The range for coefficient of discharge (Cd) for a venturimeter is
0.95 to 0.99.
22.Stream line, path line and streak line are identical when the
flow is steady.
23.There is no geometrical distinction between the streamline, path line and streak line in case of
steady flow.
24.The body whose surface does not coincide with the streamline when places in a flow is called as
bluff body.
25.For laminar flow between two fixed parallel plates, the flow velocity
varies parabolically across the section.
26. Navier-Stokes equation represents the conservation of
mass.
27.In the Navier-Stokes equations, the forces considered are
pressure, gravity, turbulence and viscous.
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