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4

The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

A. 0.855 a.√(2gH)

B. 1.855 aH.√(2g)

C. 1.585 a.√(2gH)

D. 5.85 aH.√(2g)

Correct Answer :

A. 0.855 a.√(2gH)


Related Questions

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4

Cavitation is caused by

A. High velocity

B. High pressure

C. Weak material

D. Low pressure

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4

Which of the following statement is correct?

A. In a compressible flow, the volume of the flowing liquid changes during the flow

B. A flow, in which the volume of the flowing liquid does not change, is called incompressible flow

C. When the particles rotate about their own axes while flowing, the flow is said to be rotational flow

D. All of the above

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4

Reynold's number is the ratio of the inertia force to the

A. Surface tension force

B. Viscous force

C. Gravity force

D. Elastic force

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4

A flow whose streamline is represented by a straight line, is called __________ dimensional flow.

A. One

B. Two

C. Three

D. Four

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4

In a lock-gate, the reaction between two gates is (where P = Resultant pressure on the lock gate, and α = Inclination of the gate with the normal to the side of the lock)

A. p/sinα

B. 2p/sinα

C. p/2sinα

D. 2p/sin (α/2)

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4

A ship whose hull length is 100 m is to travel at 10 m/sec. For dynamic similarity, at what velocity should a 1:25 model be towed through water?

A. 10 m/sec

B. 25 m/sec

C. 2 m/sec

D. 50 m/sec

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4

The intensity of pressure on an immersed surface __________ with the increase in depth.

A. Does not change

B. Increases

C. Decreases

D. None of these

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4

Rain drops are spherical because of

A. Viscosity

B. Air resistance

C. Surface tension forces

D. Atmospheric pressure

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4

The rise or depression of liquid in a tube due to surface tension will increase in size of tube will

A. Increase

B. Remain unaffected

C. May increase or decrease depending on the characteristics of liquid

D. Decrease

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4

The value of bulk modulus of a fluid is required to determine

A. Reynold's number

B. Froude's number

C. Mach number

D. Euler's number

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4

Kinematic viscosity is equal to

A. Dynamic viscosity/density

B. Dynamic viscosity × density

C. Density/dynamic viscosity

D. 1/dynamic viscosity × density

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4

The bulk modulus of elasticity

A. Has the dimensions of 1/pressure

B. Increases with pressure

C. Is large when fluid is more compressible

D. Is independent of pressure and viscosity

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4

The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

A. Meta center

B. Center of pressure

C. Center of buoyancy

D. Center of gravity

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4

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.

A. Neutral

B. Stable

C. Unstable

D. None of these

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4

A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called

A. Steady flow

B. Uniform flow

C. Streamline flow

D. Turbulent flow

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4

To avoid an interruption in the flow of a siphon, an air vessel is provided

A. At the inlet

B. At the outlet

C. At the summit

D. At any point between inlet and outlet

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4

Center of pressure on an inclined plane is

A. At the Centroid

B. Above the Centroid

C. Below the Centroid

D. At metacentre

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4

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

A. Metacentre

B. Center of pressure

C. Center of buoyancy

D. Center of gravity

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4

The stability of a dam is checked for

A. Tension at the base

B. Overturning of the wall or dam

C. Sliding of the wall or dam

D. All of these

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4

The value of coefficient of discharge is __________ the value of coefficient of velocity.

A. Less than

B. Same as

C. More than

D. None of these

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4

The rise of liquid along the walls of a revolving cylinder about the initial level is __________ the depression of the liquid at the axis of rotation.

A. Same as

B. Less than

C. More than

D. None of these

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4

When a tube of smaller diameter is dipped in water, the water rises in the tube with an upward __________ surface.

A. Concave

B. Convex

C. Plane

D. None of these

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4

Select the correct statement

A. Weber's number is the ratio of inertia force to elastic force.

B. Weber's number is the ratio of gravity force to surface tension force.

C. Weber's number is the ratio of viscous force to pressure force.

D. Weber's number is the ratio of inertia force to surface tension force.

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4

The discharge over a rectangular weir, considering the velocity of approach, is (whereH1 = H + Ha = Total height of water above the weir, H = Height of water over the crest of the weir, and Ha = Height of water due to velocity of approach)

A. (2/3) Cd × L.√2g [H1 - Ha]

B. (2/3) Cd × L. √2g [H1 3/2 - Ha 3/2]

C. (2/3) Cd × L.√2g [H1 2 - Ha 2]

D. (2/3) Cd × L. √2g [H1 5/2 - Ha 5/2]

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4

A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?

A. 0.5

B. 0.4

C. 0.515

D. 0.5

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4

A fluid is said to be ideal, if it is

A. Incompressible

B. Viscous and incompressible

C. Inviscous and compressible

D. Inviscous and incompressible

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4

True one-dimensional flow occurs when

A. The direction and magnitude of the velocity at all points are identical

B. The velocity of successive fluid particles, at any point, is the same at successive periods of time

C. The magnitude and direction of the velocity do not change from point to point in the fluid

D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

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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

The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be

A. 500 kg

B. 1000 kg

C. 1500 kg

D. 2000 kg

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4

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

A. Higher than the surface of liquid

B. The same as the surface of liquid

C. Lower than the surface of liquid

D. Unpredictable