Newton’s law of viscosity is a relationship between
shear stress anctthejiate of angular distortion
shear stress and viscosity
shear stress, velocity and viscosity
pressure, velocity and viscosity
Q.2.
An ideal fluid is
one which obeys Newton’s law of viscosity
frictionless and incompressible
very viscous
frictionless and compressible
Q.3.
The surface tension of mercury at normal temperature compared to that of water is
more
less
same
more or less depending on size of glass tube
Q.4.
Non uniform flow occurs when
the direction and magnitude of the velocity at all points are identical
the velocity of successive fluid par-ticles, at any point, is the same at suc-cessive periods of time
the fluid particles move in plane or parallel planes and the streamline pat-terns are identical in each plane
velocity, depth, pressure, etc. change from point to point in the fluid flow.
Q.5.
Fluid is a substance which offers no resistance to change of
pressure
flow
shape
volume
Q.6.
Surface energy per unit area of a surface is numerically equal to
atmospheric pressure
surface tension
force of adhesion
force of cohesion
Q.7.
Flow of water in a pipe about 3 meters in diameter can be measured by
orifice plate
venturi
rotameter
pitot tube
Q.8.
Free surface of a liquid tends to contract to the smallest possible area due to force of
surface tension
viscosity
friction
cohesion
Q.9.
Buoyant force is
resultant force acting on a floating body
equal to the volume of liquid displaced
force necessary to keep a body in equilibrium
the resultant force on a body due to the fluid surrounding it
Q.10.
Alcohol is used in manometers because
it has low vapour pressure
it is clearly visible
it has low surface tension
it can provide longer column due to low density
Q.11.
A perfect gas
has constant viscosity
is incompressible
is of theoretical interest
none of the above.
Q.12.
When a body floating in a liquid, is displaced slightly, it oscillates about
e.g. of body
center of pressure
center of buoyancy
metacentre
Q.13.
Mercury is often used in barometer because
it is the best liquid
the height of barometer will be less
its vapour pressure is so low that it may be neglected
both (B) and (C)
Q.14.
Operation of McLeod gauge used for low pressure measurement is based on the principle of
gas law
Boyle’s law
Charle’s law
Pascal’s law
Q.15.
Pressure of the order of 10''' torr can be measured by
Bourdon tube
Pirani Gauge
micro-manometer
ionisastion gauge
Q.16.
The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is
1/3
1/4
1/2
2/3
Q.17.
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is
1/2
2/3
3/2
2
Q.18.
Specific weight of sea water is more that of pure water because it contains
dissolved air
dissolved salt
suspended matter
all of the above
Q.19.
Coefficient of contraction for an external cylindrical mouthpiece is
1.00
0.855
0.7H
0.611
Q.20.
Resultant pressure of the liquid in the case of an immersed body acts through
center of gravity
center of pressure
metacentre
center of buoyancy
Q.21.
For a floating body to be in equilibrium
meta center should be above e.g.
center of buoyancy and e.g. must lie on same vertical plane
a righting couple should be formed
all of the above
Q.22.
In which of the following the friction drag is generally larger than pressure drag?
a circular disc or plate held normal to flow
a sphere
a cylinder
an airfoil
Q.23.
The resultant of all normal pressures acts
at e.g. of body
at center of pressure
vertically upwards
at metacentre
Q.24.
The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to
1 Pa
91 Pa
981 Pa
9810 Pa
Q.25.
The normal stress is same in all directions at a point in a fluid
only when the fluid is frictionless
only when the fluid is incompressible and has zero viscosity
when there is no motion of one fluid layer relative to an adjacent layer
irrespective of the motion of one fluid layer relative to an adjacent layer
Q.26.
A liquid compressed in cylinder has a volume of 0.m3 atkg/cm² and a volume of 0.m3 atkg/cm². The bulk modulus of elasticity of liquid is
400 kg/cm²
4000 kg/cm²
40 x 105 kg/cm²
40 x 106 kg/cm²
Q.27.
An open vessel of water is accelerated up an inclined plane. The free water surface will
be horizontal
make an angle in direction of inclination of inclined plane
make an angle in opposite direction to inclination of inclined plane
any one of above is possible
Q.28.
An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to
g/3
g/2
2g/3
g
Q.29.
At the centre line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be
minimum
maximum
negative value
could be any value
Q.30.
Choose the wrong statement.Alcohol is used in manometer, because
its vapour pressure is low
it provides suitable meniscus for the inclined tube
its density is less
it provides longer length for a given pressure difference
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