The line of action of the buoyant force acts through the
Centroid of the volume of fluid vertically above the body
Centre of the volume of floating body
Center of gravity of any submerged body
Centroid of the displaced volume of fluid
Correct Answer :
D. Centroid of the displaced volume of fluid
Related Questions
With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will
Decrease
Increase
Remain unchanged
Depend upon the characteristics of liquid
The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to
Buoyancy
Equilibrium of a floating body
Archimedes' principle
Bernoulli's theorem
The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)
K.ρ
K/ρ
ρ/K
None of these
Dynamic viscosity of most of the liquids with rise in temperature
Increases
Decreases
Remain unaffected
Unpredictable
An ideal flow of any fluid must fulfil the following
Newton's law of motion
Newton's law of viscosity
Pascal' law
Continuity equation
Viscous force is the __________ of shear stress due to viscosity and cross-section area of flow.
Sum
Different
Product
Ratio
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
Flow occurring in a pipeline when a valve is being opened is
Steady
Unsteady
Laminar
Vortex
Reynold's number is the ratio of the inertia force to the
Surface tension force
Viscous force
Gravity force
Elastic force
Rain drops are spherical because of
Viscosity
Air resistance
Surface tension forces
Atmospheric pressure
A fluid in equilibrium can't sustain
Tensile stress
Compressive stress
Shear stress
Bending stress
A structure, whose width is __________ the width of the channel, is called a flumed structure.
Less than
More than
Equal
None of these
Fluid is a substance that
Cannot be subjected to shear forces
Always expands until it fills any container
Has the same shear stress at a point regardless of its motion
Cannot remain at rest under action of any shear force
One cubic metre of water weighs
100 litres
250 litres
500 litres
1000 litres
A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to
10 kg
100 kg
1000 kg
1 kg
General energy equation holds for
Steady flow
Turbulent flow
Laminar flow
Non-uniform flow
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 water pressure per metre length on a vertical masonry wall of dam is (where w = Specific weight of the liquid, and H = Height of the liquid)
wH/2
wH
wH2/2
wH2/4
The discharge through a channel of rectangular section will be maximum, if
Its depth is twice the breadth
Its breadth is twice the depth
Its depth is thrice the breadth
Its breadth is thrice the depth
In an isothermal atmosphere, the pressure
Decreases linearly with elevation
Remain constant
Varies in the same way as the density
Increases exponentially with elevation
A moving fluid mass may be brought to a static equilibrium position, by applying an imaginary inertia force of the same magnitude as that of the accelerating force but in the opposite direction. This statement is called
Pascal's law
Archimedess principle
D-Alembert's principle
None of these
The coefficient of discharge for an external mouthpiece depends upon
Velocity of liquid
Pressure of liquid
Area of mouthpiece
Length of mouthpiece
When the flow parameters at any given instant remain same at every point, then flow is said to be
Quasi-static
Steady state
Laminar
Uniform
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
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
When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.
Sum
Difference
Arithmetic mean
Geometric mean
The property by virtue of which a liquid opposes relative motion between its different layers is called
Surface tension
Coefficient of viscosity
Viscosity
Osmosis
In a free vortex motion, the radial component of velocity everywhere is
Maximum
Minimum
Zero
Nonzero and finite
An error of 1% in measuring head over the apex of the notch (H) will produce an error of _________ in discharge over a triangular notch.
1 %
1.5 %
2 %
2.5 %
For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called
Continuity equation
Bernoulli's equation
Pascal's law
Archimedess principle