A perfect gas
Has constant viscosity
Has zero viscosity
Is in compressible
None of the above
Correct Answer :
D. None of the above
Related Questions
A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is
2.89 kN
8.29 kN
9.28 kN
28.9 kN
Unit of surface tension is
Energy/unit area
Velocity/unit area
Both of the above
It has no units
According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)
flv²/2gd
flv²/gd
3flv²/2gd
4flv²/2gd
In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.
Equal to
One-fourth
One-third
One-half
When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as
Narrow-crested weir
Broad-crested weir
Ogee weir
Submerged weir
The force per unit length is the unit of
Surface tension
Compressibility
Capillarity
Viscosity
The centre of gravity of the volume of the liquid displaced is called
Centre of pressure
Centre of buoyancy
Metacentre
None of these
Newton's law of viscosity is a relationship between
Pressure, velocity and temperature
Shear stress and rate of shear strain
Shear stress and velocity
Rate of shear strain and temperature
The product of mass and acceleration of flowing liquid is called
Inertia force
Viscous force
Gravity force
Pressure force
When a body floating in a liquid, is displaced slightly, it oscillates about
C.G. of body
Center of pressure
Center of buoyancy
Metacentre
Barometer is used to measure
Pressure in pipes, channels etc.
Atmospheric pressure
Very low pressure
Difference of pressure between two points
The hydraulic mean depth or the hydraulic radius is the ratio of
Area of flow and wetted perimeter
Wetted perimeter and diameter of pipe
Velocity of flow and area of flow
None of these
The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to
1/2 × depth
1/2 × breadth
1/2 × sloping side
1/4 × (depth + breadth)
Re-entrant or Borda's mouthpiece is an __________ mouthpiece.
Internal
External
Both A and B
None 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
The ratio of the inertia force to the elastic force is called
Reynold's number
Froude's number
Weber's number
Mach number
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)
The atmospheric pressure with rise in altitude decreases
Linearly
First slowly and then steeply
First steeply and then gradually
Unpredictable
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
The total pressure force on a plane area is equal to the area multiplied by the intensity of pressure at the Centroid, if
The area is horizontal
The area is vertical
The area is inclined
All of the above
Surface tension has the units of
Newton-sec/m
Newton-m/sec
Newton/m
Newton
Flow of water in a pipe about 3 metres in diameter can be measured by
Orifice plate
Venturimeter
Rotameter
Pitot tube
An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.
Less than twice
More than twice
Less than three times
More than three times
A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be
2A × √H₁/Cd × a × √(2g)
2A × √H₂/Cd × a × √(2g)
2A × (√H₁ - √H₂)/Cd × a × √(2g)
2A × (√H3/2 - √H3/2)/Cd × a × √(2g)
A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is
14π R1/2/15Cd × a √(2g)
14π R3/2/15Cd × a √(2g)
14π R5/2/15Cd × a √(2g)
14π R7/2/15Cd × a √(2g)
In one dimensional flow, the flow
Is steady and uniform
Takes place in straight line
Takes place in curve
Takes place in one direction
When a cylindrical vessel containing liquid is resolved, the surface of the liquid takes the shape of
A triangle
A paraboloid
An ellipse
None of these
The mercury does not wet the glass. This is due to the property of the liquid known as
Cohesion
Adhesion
Viscosity
Surface tension
Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the
Force of adhesion
Force of cohesion
Force of friction
Force of diffusion
The coefficient of viscosity may be determined by
Capillary tube method
Orifice type viscometer
Rotating cylinder method
All of these