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Civil Engineering
Hydraulics And Fluid Mechanics
Quiz 9
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Q.1
The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be
500 kg
1000 kg
1500 kg
2000 kg
Q.2
A metal with specific gravity of o floating in a fluid of same specific gravity a will
sink to bottom
float over fluid
partly immersed
be fully immersed with top surface at fluid surface
Q.3
The time oscillation of a floating body with increase in metacentric height will be
same
higher
lower
lower/higher depending on weight of body
Q.4
If no resistance is encountered by displacement, such a substance is known as
fluid
water
perfect solid
ideal fluid
Q.5
The volumetric change of the fluid caused by a resistance is known as
volumetric strain
volumetric index
compressibility
adhesion
Q.6
A square surface 3 m x 3 m lies in a vertical line in water pipe its upper edge at vater surface. The hydrostatic force on square surface is
9,000 kg
13,500 kg
18,000 kg
27,000 kg
Q.7
The center of pressure of a surface subjected to fluid pressure is the point
on the surface at which resultant pres-sure acts
on the surface at which gravitational force acis
at which all hydraulic forces meet
similar to metacentre
Q.8
Surface tension
acts in the plane of the interface normal to any line in the surface
is also known as capillarity
is a function of the curvature of the interface
decreases with fall in temperature
Q.9
Piezometer is used to measure
pressure in pipe, channels etc
atmospheric pressure
very low pressures
difference of pressure between two points
Q.10
Barometer is used to measure
pressure in pipes, channels etc
atmospheric pressure
very low pressure
difference of pressure between two points
Q.11
Differential monometer is used to measure
pressure in pipes, channels etc
atmospheric pressure
very low pressure
difference of pressure between two points
Q.12
The normal stress in a fluid will be constant in all directions at a point only if
it is incompressible
it has uniform viscosity
it is frictionless
it is at rest
Q.13
A rectangular block 2 m long, 1 m wide and 1 m deep floats in water, the depth of immersion being 0.5 m. If water weighs 10 kN/m3, then the weight of the block is
5kN
lOkN
15 kN
20 kN
Q.14
The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is (where R is radius of pipe)
0.223 R
0.423 R
0.577 R
0.707 R
Q.15
A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury ?
0.5
0.4
0.515
0.5
Q.16
Hot wire anemometer is used to measure
discharge
velocity of gas
pressure intensity of gas
pressure intensity of liquid
Q.17
Choose the correct relationship
specific gravity = gravity x density
dynamicviscosity = kinematicviscosity x density
gravity = specific gravity x density
kinematicviscosity = dynamicviscosity x density
Q.18
If the velocity is zero over half of the cross-sectional area and is uniform over the remaining half, then the momentum correction factor is
1
4/3
2
4
Q.19
Manometer is used to measure
pressure in pipes, channels etc
atmospheric pressure
very low pressure
difference of pressure between two points
Q.20
Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is
slightly less
slightly more
nearly half
equal
Q.21
Practical fluids
are viscous
possess surface tension
are compressible
possess all the above properties
Q.22
General energy equation holds for
steady flow
turbulent flow
laminar flow
non-uniform flow
Q.23
The pitot tube is used to measure
velocity at stagnation point
stagnation pressure
static pressure
dynamic pressure
Q.24
Hot wire anemometer is used to measure
pressure in gases
liquid discharge
pressure in liquids
gas velocities
Q.25
Units of surface tension are
energy/unit area
distance
both of the above
it has no units
Q.26
Dimensions of surface tension are
ML
°
T
-2
ML
°
T
ML r
-2
ML
2
T
2
Q.27
Which of the following instruments is used to measure flow on the application of Bernoulli’s theorem
Venturimeter
Orifice plate
pitot tube
all of the above
Q.28
The angle of contact in case of a liquid depends upon
the nature of the liquid and the solid
the material which exists above the free surface of the liquid
both of die above
any one of the above
Q.29
When the velocity distribution is uniform over the cross-section, the correction factor for momentum is
0
1
4/3
2
Q.30
Size of a venturimeter is specified by
pipe diameter
throat diameter
angle of diverging section
both pipe diameter as well as throat diameter
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