The equation of continuity holds good when the flow
Is steady
Is one dimensional
Velocity is uniform at all the cross sections
All of the above
Correct Answer :
D. All of the above
Related Questions
According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)
(2/3) × Cd (L - nH) × √(2gh)
(2/3) × Cd (L - 0.1nH) × √(2g) × H3/2
(2/3) × Cd (L - nH) × √(2g) × H²
(2/3) × Cd (L - nH) × √(2g) × H5/2
The centre of gravity of the volume of the liquid displaced is called
Centre of pressure
Centre of buoyancy
Metacentre
None of these
Pressure of the order of 10 torr can be measured by
Bourdon tube
Pirani Gauge
Micro-manometer
Lonisation gauge
The pressure at a point 4 m below the free surface of water is
19.24 kPa
29.24 kPa
39.24 kPa
49.24 kPa
The intensity of pressure at any point, in a liquid, is
Directly proportional to the area of the vessel containing liquid
Directly proportional to the depth of liquid from the surface
Directly proportional to the length of the vessel containing liquid
Inversely proportional to the depth of liquid from the surface
The mercury does not wet the glass. This is due to the property of the liquid known as
Cohesion
Adhesion
Viscosity
Surface tension
Differential manometer is used to measure
Pressure in pipes, channels etc.
Atmospheric pressure
Very low pressure
Difference of pressure between two points
The velocity at which the laminar flow stops, is known as
Velocity of approach
Lower critical velocity
Higher critical velocity
None of these
The flow in which conditions do not change with time at any point, is known as
One dimensional flow
Uniform flow
Steady flow
Turbulent flow
The surface tension of mercury at normal temperature compared to that of water is
More
Less
Same
More or less depending on size of glass tube
Bulk modulus of a fluid __________ as the pressure increases.
Remain same
Decreases
Increases
None of these
For pipes, turbulent flow occurs when Reynolds number is
Less than 2000
Between 2000 and 4000
More than 4000
Less than 4000
The specific weight of sea water is __________ that of pure water.
Same as
Less than
More than
None of these
The divergent portion of a Venturimeter is made longer than convergent portion in order to
Avoid the tendency of breaking away the stream of liquid
To minimise frictional losses
Both (A) and (B)
None of these
According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.
Equal to
Directly proportional
Inversely proportional
None of these
The center of gravity of the volume of the liquid displaced by an immersed body is called
Metacentre
Center of pressure
Center of buoyancy
Center of gravity
A fluid in equilibrium can't sustain
Tensile stress
Compressive stress
Shear stress
Bending stress
Choose the wrong statement
Any weight, floating or immersed in a liquid, is acted upon by a buoyant force
Buoyant force is equal to the weight of the liquid displaced
The point through which buoyant force acts, is called the center of buoyancy
Center of buoyancy is located above the center of gravity of the displaced liquid
When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called
Gauge pressure
Absolute pressure
Positive gauge pressure
Vacuum pressure
Flow occurring in a pipeline when a valve is being opened is
Steady
Unsteady
Laminar
Vortex
Coefficient of contraction is the ratio of
Actual velocity of jet at vena contracta to the theoretical velocity
Loss of head in the orifice to the head of water available at the exit of the orifice
Loss of head in the orifice to the head of water available at the exit of the orifice
Area of jet at vena-contracta to the area of orifice
For pipes, laminar flow occurs when Reynolds number is
Less than 2000
Between 2000 and 4000
More than 4000
Less than 4000
Density of water is maximum at
0° C
0° K
4° C
100° C
The coefficient of discharge for an external mouthpiece is
0.375
0.5
0.707
0.855
The coefficient of viscosity may be determined by
Capillary tube method
Orifice type viscometer
Rotating cylinder method
All of these
If a body floating in a liquid occupies a new position and remains at rest in this new position, when given a small angular displacement, the body is said to be in __________ equilibrium.
Neutral
Stable
Unstable
None of these
Choose the wrong statement
Fluids are capable of flowing
Fluids conform to the shape of the containing vessels
When in equilibrium, fluids cannot sustain tangential forces
When in equilibrium, fluids can sustain shear forces
Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as
Lift
Drag
Stagnation pressure
Bulk modulus
The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)
(8/15) Cd. 2g. H
(8/15) Cd. 2g. H3/2
(8/15) Cd. 2g. H²
(8/15) Cd. 2g. H5/2
When an internal mouthpiece is running free, the discharge through the mouthpiece is: (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)
0.5 a. √2gH
0.707 a. √2gH
0.855 a. √2gH
a. √2gH