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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

Correct Answer :

B. Center of pressure


Related Questions

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4

When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

A. Pascal's law

B. Archimedess principle

C. Principle of floatation

D. Bernoulli's theorem

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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

The discharge through a channel of rectangular section will be maximum, if

A. Its depth is twice the breadth

B. Its breadth is twice the depth

C. Its depth is thrice the breadth

D. Its breadth is thrice the depth

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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

The efficiency of power transmission through pipe is (where H = Total supply head, and hf = Head lost due to friction in the pipe)

A. (H - hf )/H

B. H/(H - hf )

C. (H + hf )/H

D. H/(H + hf )

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4

The region between the separation streamline and the boundary surface of the solid body is known as

A. Wake

B. Drag

C. Lift

D. Boundary layer

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4

The total energy of each particle at various places in the case of perfect incompressible fluid flowing in continuous stream

A. Keeps on increasing

B. Keeps on decreasing

C. Remain constant

D. May increase/decrease

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4

The torque required to overcome viscous resistance of a collar bearing is (where R1 andR2 = External and internal radius of collar)

A. (μπ²N/60t) × (R₁ - R₂)

B. (μπ²N/60t) × (R₁² - R₂²)

C. (μπ²N/60t) × (R₁³ - R₂³)

D. (μπ²N/60t) × (R₁⁴ - R₂⁴)

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4

Which of the following instrument can be used for measuring speed of an aeroplane?

A. Venturimeter

B. Orifice plate

C. Pitot tube

D. Rotameter

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4

The velocity corresponding to Reynold number of 2000 is called

A. Sub-sonic velocity

B. Super-sonic velocity

C. Lower critical velocity

D. Higher critical velocity

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4

When a tank containing liquid moves with an acceleration in the horizontal direction, then the free surface of the liquid

A. Remains horizontal

B. Becomes curved

C. Falls on the front end

D. Falls on the back end

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4

According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.

A. Equal to

B. Directly proportional

C. Inversely proportional

D. None of these

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4

The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

A. The bodies A and B have equal stability

B. The body A is more stable than body B

C. The body B is more stable than body A

D. The bodies A and B are unstable

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4

Specific weight of water in S.I. units is equal to

A. 1000 N/m3

B. 10000 N/m3

C. 9.81 × 103 N/m3

D. 9.81 × 10⁶ N/m3

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4

A flow through a long pipe at constant rate is called

A. Steady uniform flow

B. Steady non-uniform flow

C. Unsteady uniform flow

D. Unsteady non-uniform flow

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4

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

A. 5 mm

B. 10 mm

C. 20 mm

D. 30 mm

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4

The discharge in an open channel corresponding to critical depth is

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

When an internal mouthpiece is running free, the discharge through the mouthpiece is: (where a = Area of mouthpiece, and H = Height of liquid above the mouthpiece)

A. 0.5 a. √2gH

B. 0.707 a. √2gH

C. 0.855 a. √2gH

D. a. √2gH

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4

The hammer blow in pipes occurs when

A. There is excessive leakage in the pipe

B. The pipe bursts under high pressure of fluid

C. The flow of fluid through the pipe is suddenly brought to rest by closing of the valve

D. The flow of fluid through the pipe is gradually brought to rest by closing of the valve

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4

Mach number is significant in

A. Supersonics, as with projectiles and jet propulsion

B. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls

D. All of the above

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4

Which of the following is dimensionless?

A. Specific weight

B. Specific volume

C. Specific speed

D. Specific gravity

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4

A structure, whose width is __________ the width of the channel, is called a flumed structure.

A. Less than

B. More than

C. Equal

D. None of these

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4

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)

A. Q = Cd × a × 2gh

B. Q = (2/3). Cd × a × h

C. Q = (Cd × a)/√(2gh)

D. Q = (3Cd × a)/√(2h)

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4

Bulk modulus of a fluid __________ as the pressure increases.

A. Remain same

B. Decreases

C. Increases

D. None of these

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4

A flow through an expanding tube at constant rate is called

A. Steady uniform flow

B. Steady non-uniform flow

C. Unsteady uniform flow

D. Unsteady non-uniform flow

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4

Froude's number is the ratio of inertia force to

A. Pressure force

B. Elastic force

C. Gravity force

D. Surface tension force

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4

The loss of pressure head in case of laminar flow is proportional to

A. Velocity

B. (Velocity)2

C. (Velocity)3

D. (Velocity)4

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4

The liquid used in manometers should have

A. Low density

B. High density

C. Low surface tension

D. High surface tension

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4

A square surface 3 m × 3 m lies in a vertical line in water pipe its upper edge at water surface. The hydrostatic force on square surface is

A. 9,000 kg

B. 13,500 kg

C. 18,000 kg

D. 27,000 kg

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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