The liquid used in manometers should have
Low density
High density
Low surface tension
High surface tension
Correct Answer :
D. High surface tension
Related Questions
The upper surface of a weir over which water flows is known is
Crest
Nappy
Sill
Weir top
The stress-strain relation of the Newtonian fluid is
Linear
Parabolic
Hyperbolic
Inverse type
When a body is placed over a liquid, it will sink down if
Gravitational force is equal to the up-thrust of the liquid
Gravitational force is less than the up-thrust of the liquid
Gravitational force is more than the up-thrust of the liquid
None of the above
Free surface of a liquid tends to contract to the smallest possible area due to force of
Surface tension
Viscosity
Friction
Cohesion
Falling drops of water become spheres due to the property of
Surface tension of water
Compressibility of water
Capillarity of water
Viscosity of water
If the depth of water in an open channel is less than the critical depth, the flow is called
Critical flow
Turbulent flow
Tranquil flow
Torrential flow
Center of pressure compared to e.g. is
Above it
Below it
At same point
Above or below depending on area of body
Ratio of inertia force to surface Jension is known as
Mach number
Froude number
Reynoldss number
Weber's number
The volumetric change of the fluid caused by a resistance is known as
Volumetric strain
Volumetric index
Compressibility
Adhesion
The line of action of the buoyant force acts through the Centroid of the
Submerged body
Volume of the floating body
Volume of the fluid vertically above the body
Displaced volume of the fluid
The value of the coefficient of compressibility for water at ordinary pressure and temperature in kg/cm is equal to
2100
2700
10,000
21,000
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
Resultant pressure of the liquid in the case of an immersed body acts through
Centre of gravity
Centre of pressure
Metacentre
Centre of buoyancy
The mercury does not wet the glass. This is due to the property of the liquid known as
Cohesion
Adhesion
Viscosity
Surface tension
The discharge over a rectangular notch is
Inversely proportional to H3/2
Directly proportional to H3/2
Inversely proportional to H5/2
Directly proportional to H5/2
When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface.
Concave
Convex
Plane
None of these
A flow whose streamline is represented by a curve, is called
One-dimensional flow
Two-dimensional flow
Three-dimensional flow
Four-dimensional flow
The discharge through a small rectangular orifice is given by (where Cd = Coefficient of discharge for the orifice, a = Cross-sectional area of the orifice, h = Height of the liquid above the centre of the orifice)
Q = Cd × a × 2gh
Q = (2/3). Cd × a × h
Q = (Cd × a)/√(2gh)
Q = (3Cd × a)/√(2h)
In the case of steady flow of a fluid, the acceleration of any fluid particle is
Constant
Variable
Zero
Zero under limiting conditions
If the coefficient of discharge is 0.6, then the discharge over a right angled notch is
0.417 H5/2
1.417 H5/2
4.171 H5/2
7.141 H5/2
If a body floating in a liquid returns back to its original position, when given a small angular displacement, the body is said to be in
Neutral equilibrium
Stable equilibrium
Unstable equilibrium
None of these
The discharge of a depressed nappe is 6 to 7 percent __________ that of a free nappe.
Less than
More than
Equal to
None of these
The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as
Meta center
Center of pressure
Center of buoyancy
Center of gravity
Alcohol is used in manometers because
It has low vapour pressure
It is clearly visible
It has low surface tension
It can provide longer column due to low density
A balloon lifting in air follows the following principle
Law of gravitation
Archimedes principle
Principle of buoyancy
All of the above
In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be
Double
Four times
Eight times
Sixteen times
The hammer blow in pipes occurs when
There is excessive leakage in the pipe
The pipe bursts under high pressure of fluid
The flow of fluid through the pipe is suddenly brought to rest by closing of the valve
The flow of fluid through the pipe is gradually brought to rest by closing of the valve
When the Mach number is less than unity, the flow is called
Sub-sonic flow
Sonic flow
Super-sonic flow
Hyper-sonic flow
For a floating body to be in equilibrium
Meta centre should be above e.g.
Centre of buoyancy and e.g. must lie on same vertical plane
A righting couple should be formed
All of the above
Euler's dimensionless number relates the following
Inertial force and gravity
Viscous force and inertial force
Viscous force and buoyancy force
Pressure force and inertial force