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Civil Engineering
Hydraulics And Fluid Mechanics
Quiz 8
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Q.1
Stream lines and path lines always coincide in case of
steady flow
laminar flow
uniform flow
turbulent flow
Q.2
For manometer, a better liquid combination is one having
higher surface tension
lower surface tension
surface tension is no criterion
high density and viscosity
Q.3
The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is ap-proximately
5 mm
10 mm
20 mm
30 mm
Q.4
If the surface of liquid is convex, men
cohesion pressure is negligible
cohesion pressure is decreased
cohesion pressure is increased
there is no cohesion pressure
Q.5
In series-pipe problems
the head loss is same through each pipe
the discharge is same through each pipe
a trial solution is not necessary
the discharge through each pipe is added to obtain total discharge
Q.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
Q.7
The pressure at the summit of a syphon is
equal to atmospheric
less than atmospheric
more than atmospheric
none of the above
Q.8
Center of pressure on an inclined plane is
at the centroid
above the centroid
below the centroid
at metacentre
Q.9
Which of the following velocity potentials satisfies continuity equation ?
x
2
y
x
2
-y
2
cosx
x
2
+ y
2
Q.10
Capillary action is due to the
surface tension
cohesion of the liquid
adhesion of the liquid molecules and the molecules on the surface of a solid
all of the above
Q.11
The continuity equation is connected with
viscous/unviscous fluids
compressibility of fluids
conservation of mass
steady/unsteady flow
Q.12
Kinematic viscosity is dependent upon
pressure
distance
flow
density
Q.13
Froude number is significant in
supersonics, as with projectile and jet propulsion
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity forces, and wave making effect, as with ship’s hulls
all of the above
Q.14
In a static fluid
resistance to shear stress is small
fluid pressure is zero
linear deformation is small
only normal stresses can exist
Q.15
The motion of air mass in a tornado is a
free vortex motion
forced vortex motion
free vortex at center and forced vortex outside
forced vortex at center and free vortex outside
Q.16
Euler’s dimensionless number relates the following
inertial force and gravity
viscous force and inertial force
viscous force and buoyancy force
pressure force and inertial force
Q.17
A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be
1 m
10m
100m
none of the above
Q.18
The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as
one dimensional flow
uniform f^w
steady flow
turbulent flow
Q.19
The flow in which the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, is known as
one dimensional flow
uniform flow
steady flow
turbulent flow
Q.20
The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is
32 km
20 km
8 km
4 km
Q.21
If the weight of a body immersed in a fluid exceeds the buoyant force, then the body will
rise until its weight equals the buoyant force
tend to move downward and it may finally sink
float
none of the above
Q.22
A liquid would wet the solid, if adhesion forces as compared to cohesion forces are
less
more
equal
less at low temperature and more at high temperature
Q.23
A floating body is said to be in a state of stable equilibrium
when its metacentric height is zero
when the metacentre is above the centre of gravity
when the metacentre is below the centre of gravity
only when its centre of gravity is below its centre of buoyancy
Q.24
A body floats in stable equilibrium
when its meatcentric height is zero
when the metancentre is above e.g.
when its e.g. is below it’s center of buoyancy
metacentre has nothing to do with position of e.g. for determining stability
Q.25
Metacentric height for small values of angle of heel is the distance between the
centre of gravity and centre of buoy-ancy
centre of gravity and metacentre
centre of buoyancy and metacentre
free surface and centre of buoyancy
Q.26
The wake
always occurs before a separation point
always occurs after a separation point
is a region of high pressure intensity
none of the above
Q.27
In a forced vortex, the velocity of flow everywhere within the fluid is
maximum
minimum
zero
non-zero finite
Q.28
The units of kinematic viscosity are
metres² per sec
kg sec/meter
newton-sec per meter
newton-sec per meter
Q.29
The specific weight of water is 1000 kg/m”
at normal pressure of 760 mm
at 4°C temperature
at mean sea level
all the above
Q.30
Density of water is maximum at
0°C
0°K
4°C
100°C
0 h : 0 m : 1 s
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