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Civil Engineering
Hydraulics And Fluid Mechanics
Quiz 1
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Q.1
For a body floating in a liquid the normal pressure exerted by the liquid acts at
bottom surface of the body
e.g. of the body
metacentre
all points on the surface of the body
Q.2
All the terms of energy in Bernoulli’s equation have dimension of
energy
work
mass
length
Q.3
The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)
0.423 D
0.577 D
0.223 D
0.707 D
Q.4
For hypersonic flow, the Mach number is
unity
greater than unity
greater than 2
greater than 4
Q.5
Metacentric height is the distance between the metacentre and
water surface
center of pressure
center of gravity
center of buoyancy
Q.6
The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is
d > m > e
d > e > m
e > m > d
e > d > m
Q.7
The velocity distribution for laminar flow through a circular tube
is constant over the cross-section
varies linearly from zero at walls to maximum at centre
varies parabolically with maximum at the centre
none of the above
Q.8
In the case of steady flow of a fluid, the acceleration of any fluid particle is
constant
variable
zero
zero under limiting conditions
Q.9
Ratio of inertia force to elastic force is known as
Mach number
Froude number
Reynold’s number
Weber’s number
Q.10
The major loss of energy in long pipes is due to
sudden enlargement
sudden contraction
gradual contraction or enlargement
friction
Q.11
Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called
adhesion
cohesion
viscosity
compressibility
Q.12
The flow in which each liquid particle has a definite path and their paths do not cross each other is called
one dimensional flow
uniform flow
turbulent flow
streamline flow
Q.13
If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be
h
wh
w/h
h/w
Q.14
A streamline is defined as the line
parallel to central axis flow
parallel to outer surface of pipe
of equal yelocity in a flow
along which the pressure drop is uniform
Q.15
The two important forces for a floating body are
buoyancy, gravity
buoyancy, pressure
buoyancy, inertial
inertial, gravity
Q.16
The conditions for the stable equilibrium of a floating body are
the meta-center should lie above the center of gravity
the center of buoyancy and the center of gravity must lie on the same vertical line
a righting couple should be formed
all the above are correct
Q.17
Coefficient of contraction for an external cylindrical mouthpiece is
1.00
0.855
0.7H
0.611
Q.18
Surface energy per unit area of a surface is numerically equal to
atmospheric pressure
surface tension
force of adhesion
force of cohesion
Q.19
For very great pressures, viscosity of moss gases and liquids
remains same
increases
decreases
shows erratic behaviour
Q.20
Which of the following manometer has highest sensitivity
U-tube with water
inclined U-tube
U-tube with mercury
micro-manometer with water
Q.21
A one dimensional flow is one which
is uniform flow
is steady uniform flow
takes place in straight lines
involves zero transverse component of flow
Q.22
The upper surface of a weir over which water flows is known is
crest
nappe
sill
weir top
Q.23
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.24
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.25
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.26
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.27
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is
1/2
2/3
3/2
2
Q.28
A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/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.29
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.30
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
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