Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?
Venturimeter
Orifice plate
Hot wire anemometer
Pitot tube
Correct Answer :
D. Pitot tube
Related Questions
The pressure of air __________ with the increase of height from the surface of the earth.
Does not change
Decreases
Increases
None of these
Choose the wrong statement
Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force
Viscosity is due primarily to interaction between fluid molecules
Viscosity of liquids decreases with increase in temperature
Viscosity of liquids is appreciably affected by change in pressure
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
If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be
Higher than the surface of liquid
The same as the surface of liquid
Lower than the surface of liquid
Unpredictable
A venturi-flume is used to measure
Pressure of liquid
Discharge of liquid
Pressure difference between two points in a channel
Pressure difference between two points in a pipe
The dynamic viscosity of gases __________ with rise in temperature.
Remain unaffected
Increases
Decreases
None of these
The point at which the resultant pressure on an immersed surface acts, is known as
Centre of gravity
Centre of depth
Centre of pressure
Centre of immersed surface
Select the correct statement
Weber's number is the ratio of inertia force to elastic force.
Weber's number is the ratio of gravity force to surface tension force.
Weber's number is the ratio of viscous force to pressure force.
Weber's number is the ratio of inertia force to surface tension force.
When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is
ω.r/2g
ω².r²/2g
ω.r/4g
ω².r²/4g
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
The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is
(v₁ - v₂)²/g
(v₁² - v₂²)/g
(v₁ - v₂)²/2g
(v₁² - v₂²)/2g
Non uniform flow occurs when
The direction and magnitude of the velocity at all points are identical
The velocity of successive fluid particles, at any point, is the same at successive periods of time
Velocity, depth, pressure, etc. change from point to point in the fluid flow.
The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane
The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called
Density of liquid
Specific gravity of liquid
Compressibility of liquid
Surface tension of liquid
According to Manning's formula, the discharge through an open channel is (where M = Manning's constant)
A × M × m1/2 × i2/3
A × M × m2/3 × i1/2
A1/2 × M2/3 × m × i
A2/3 × M1/3 × m × i
For hypersonic flow, the Mach number is
Unity
Greater than unity
Greater than 2
Greater than 4
A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is 
(bd²/12) + x
(d²/12 x) + x
b²/12 + x
d²/12 + x
The unit of dynamic viscosity in S.I. units is
N-m/s2
N-s/m2
Poise
Stoke
Stoke is the unit of
Kinematic viscosity in C. G. S. units
Kinematic viscosity in M. K. S. units
Dynamic viscosity in M. K. S. units
Dynamic viscosity in S. I. units
Bernoulli's equation is applied to
Venturimeter
Orifice meter
Pitot tube
All of these
Kinematic viscosity is dependent upon
Pressure
Distance
Density
Flow
A fluid having no viscosity is known as
Real fluid
Ideal fluid
Newtonian fluid
Non-Newtonian fluid
General energy equation holds for
Steady flow
Turbulent flow
Laminar flow
Non-uniform flow
Froude's number is the ratio of inertia force to
Pressure force
Elastic force
Gravity force
Surface tension force
Coefficient of discharge Cd is equal to (where Cc = Coefficient of contraction, Cv = Coefficient of velocity, and Cr = Coefficient of resistance)
Cc × Cv
Cc × Cr
Cv × Cr
Cc/Cr
One stoke is equal to
10-2 m2/s
10-3 m2/s
10-4 m2/s
10-6 m2/s
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
The centre of gravity of the volume of the liquid displaced by an immersed body is called
Centre of gravity
Centre of pressure
Metacentre
Centre of buoyancy
In a venturi-flume, the flow takes place at
Atmospheric pressure
Gauge pressure
Absolute pressure
None of these
When a body floating in a liquid, is displaced slightly, it oscillates about
C.G. of body
Center of pressure
Center of buoyancy
Metacentre
Working principle of dead weight pressure gauge tester is based on
Pascal's law
Dalton's law of partial pressure
Newton's law of viscosity
Avogadro's hypothesis