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Civil Engineering
Hydraulics And Fluid Mechanics
Quiz 10
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Q.1
Which of the following is an incorrect statement ?
Coefficient of contraction of a venturimeter is unity
Flow nozzle is cheaper than venturimeter but has higher energy loss
Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined
None of the above statement is correct
Q.2
Flow occurring in a pipeline when a valve is being opened is
steady
unsteady
laminar
vortex
Q.3
Dynamic viscosity of most of the liquids with rise in temperature
increases
decreases
remains unaffected
unpredictable
Q.4
Dynamic viscosity of most of the gases with rise in temperature
increases
decreases
remains unaffected
unpredictable
Q.5
Total pressure on a lmxlm gate immersed vertically at a depth of 2 m below the free water surface will be
1000 kg
4000 kg
2000 kg
8000 kg
Q.6
The value of mass density in kgsecVm4 for water at 0°C is
1
1000
100
101.9
Q.7
The buoyancy depends on
mass of liquid displaced
viscosity of the liquid
pressure of the liquid displaced
depth of immersion
Q.8
For pipes, laminar flow occurs when Roynolds number is
less than 2000
between 2000 and 4000
more than 4000
less than 4000
Q.9
The speed of sound in a ideal gas varies directly as its
absolute temperature
temperature
density
modulus of elasticity
Q.10
Liquids transmit pressure equally in all the directions. This is according to
Boyle’s law
Archimedes principle
Pascal’s law
Newton’s formula
Q.11
The velocity of jet of water travelling out of opening in a tank filled with water is proportional to
head of water (h)
h2
V/T
h2
Q.12
Poise is the unit of
surface tension
capillarity
viscosity
shear stress in fluids
Q.13
The rise or depression of liquid in a tube due to surface tension wim increase in size of tube will
increase
remain unaffected
may increase or decrease depending on the characteristics of liquid
decrease
Q.14
Viscosity of water in comparison to mercury is
higher
lower
same
higher/lower depending on temperature
Q.15
Select the incorrect statement.
The pressure intensity at vena contracta is atmospheric
Contraction is least at vena contracta
Stream lines are parallel throughout the jet at vena contracta
Coefficient of contraction is always less than one
Q.16
Kinematic viscosity is equal to
dynamic viscosity/density
dynamicviscosity x density
density/dynamic viscosity
1/dynamicviscosity x density
Q.17
The losses are more in
laminar flow
transition flow
turbulent flow
critical flow
Q.18
The increase of temperature results in
increase in viscosity of gas
increase in viscosity of liquid
decrease in viscosity of gas
decrease in viscosity of liquid
Q.19
A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is
0.83
0.6
0.4
0.3
Q.20
The bulk modulus of elasticity with increase in pressure
increases
decreases
remains constant
increases first upto certain limit and then decreases
Q.21
The depth of the center of pressure on a vertical rectangular gate 8 m wide and 6 m high, when the water surface coincides with the top of the gate, is
2.4 m
3.0 m
4.0 m
2.5 m
Q.22
The maximum thickness of boundary layer in a pipe of radius r is
0
r/2
r
2r
Q.23
The speed of a pressure wave through a pipe depends upon
the length of pipe
the viscosity of fluid
the bulk modulus for the fluid
the original head
Q.24
Which of the following instrument can be used for measuring speed of a submarine moving in deep sea
Venturimeter
hot wire anemometer
rotameter
pitot tube
Q.25
If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water
51 cm
50 cm
52 cm
52.2 cm
Q.26
The vapour pressure over the concave surface is
less man the vapour pressure over the plane surface
equal to the vapour pressure over the plane surface
greater than the vapour pressure over the plane surface
zero
Q.27
The equation of continuity holds good when the flow
is steady
is one dimensional
velocity is uniform at all the cross sec-tions
all of the above
Q.28
Pitot tube is used for measurement of
pressure
flow
velocity
dsscharge
Q.29
Principle of similitude forms the basis of
comparing two identical equipments
designing models so that the result can be converted to prototypes
comparing similarity between design and actual equipment
hydraulic designs
Q.30
Select the correct statement.
The absolute roughness of a pipe de-creases with time
A pipe becomes smooth after using for long time
The friction factor decreases with time
The absolute roughness increases with time
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