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4

The tangential velocity of the water element having a free vortex is

A. Directly proportional to its distance from the centre

B. Inversely proportional to its distance from the centre

C. Directly proportional to its (distance)2 from the centre

D. Inversely proportional to its (distance)2 from the centre

Correct Answer :

B. Inversely proportional to its distance from the centre


Related Questions

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4

Which of the following statement is wrong?

A. A flow whose streamline is represented by a curve is called two dimensional flow.

B. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.

C. The length of divergent portion in a Venturimeter is equal to the convergent portion.

D. A pitot tube is used to measure the velocity of flow at the required point in a pipe.

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4

An open vessel of water is accelerated up an inclined plane. The free water surface will

A. Be horizontal

B. Make an angle in direction of inclination of inclined plane

C. Make an angle in opposite direction to inclination of inclined plane

D. Any one of above is possible

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4

According to equation of continuity,

A. w1a1 = w2a2

B. w1v1 = w2v2

C. a1v1 = a2v2

D. a1/v1 = a2/v2

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4

The property of fluid by virtue of which it offers resistance to shear is called

A. Surface tension

B. Adhesion

C. Cohesion

D. Viscosity

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4

Poise is the unit of

A. Surface tension

B. Capillarity

C. Viscosity

D. Shear stress in fluids

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4

The centre of gravity of the volume of the liquid displaced by an immersed body is called

A. Centre of gravity

B. Centre of pressure

C. Metacentre

D. Centre of buoyancy

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4

According to Bernoulli's equation

A. Z + p/w + v²/2g = constant

B. Z + p/w - v²/2g = constant

C. Z - p/w + v²/2g = constant

D. Z - p/w - v²/2g = constant

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4

The specific gravity of water is taken as

A. 0.001

B. 0.01

C. 0.1

D. 1

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4

In an internal mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to height of the liquid above the vena contracta.

A. Less than

B. More than

C. Equal to

D. None of these

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4

A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

A. Notch

B. Weir

C. Mouthpiece

D. Nozzle

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4

The time oscillation of a floating body with increase in meatcentric height will be

A. Same

B. Higher

C. Lower

D. Lower/higher depending on weight of body

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4

When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

A. Narrow-crested weir

B. Broad-crested weir

C. Ogee weir

D. Submerged weir

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4

In a free nappe,

A. The pressure below the nappe is atmospheric

B. The pressure below the nappe is negative

C. The pressure above the nappe is atmospheric

D. The pressure above the nappe is negative

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4

Newton's law of viscosity is a relationship between

A. Shear stress and the rate of angular distortion

B. Shear stress and viscosity

C. Shear stress, velocity and viscosity

D. Pressure, velocity and viscosity

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4

Metacentric height is given as the distance between

A. The center of gravity of the body and the metacentre

B. The center of gravity of the body and the center of buoyancy

C. The center of gravity of the body and the center of pressure

D. Center of buoyancy and metacentre

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4

Water is a __________ fluid.

A. Real

B. Ideal

C. Newtonian

D. Non-Newtonian

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4

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

A. Pascal's law

B. Archimedess principle

C. D-Alembert's principle

D. None of these

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4

A point, in a compressible flow where the velocity of fluid is zero, is called

A. Critical point

B. Vena contracta

C. Stagnation point

D. None of these

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4

The pressure less than atmospheric pressure is known as

A. Suction pressure

B. Vacuum pressure

C. Negative gauge pressure

D. All of these

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4

Kinematic viscosity is dependent upon

A. Pressure

B. Distance

C. Density

D. Flow

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4

The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

A. Q = Cd × bH₁ × √(2gh)

B. Q = Cd × bH2 × √(2gh)

C. Q = Cd × b (H2 - H1) × √(2gh)

D. Q = Cd × bH × √(2gh)

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4

Euler's dimensionless number relates the following

A. Inertial force and gravity

B. Viscous force and inertial force

C. Viscous force and buoyancy force

D. Pressure force and inertial force

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4

An air vessel is provided at the summit in a siphon to

A. Avoid interruption in the flow

B. Increase discharge

C. Increase velocity

D. Maintain pressure difference

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4

Falling drops of water become spheres due to the property of

A. Surface tension of water

B. Compressibility of water

C. Capillarity of water

D. Viscosity of water

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4

Mercury is often used in barometer because

A. It is the best liquid

B. The height of barometer will be less

C. Its vapour pressure is so low that it may be neglected

D. Both (B) and (C)

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4

Buoyant force is

A. The resultant force acting on a floating body

B. The resultant force on a body due to the fluid surrounding it

C. Equal to the volume of liquid displaced

D. The force necessary to maintain equilibrium of a submerged body

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4

A differential manometer is used to measure

A. Atmospheric pressure

B. Pressure in pipes and channels

C. Pressure in Venturimeter

D. Difference of pressures between two points in a pipe

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4

Resultant pressure of the liquid in the case of an immersed body acts through

A. Centre of gravity

B. Centre of pressure

C. Metacentre

D. Centre of buoyancy

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4

The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

A. v₁²/2g

B. v₂²/2g

C. 0.5 v₁²/2g

D. 0.375 v₂²/2g

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4

The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)

A. 4μvl/wd²

B. 8μvl/wd²

C. 16μvl/wd²

D. 32μvl/wd²