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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

Correct Answer :

B. Archimedess principle


Related Questions

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4

The height of a water column equivalent to a pressure of 0.15 MPa is

A. 15.3 m

B. 25.3 m

C. 35.3 m

D. 45.3 m

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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

The coefficient of discharge in case of internal mouthpiece is __________ that of external mouthpiece.

A. Less than

B. More than

C. Equal to

D. None of these

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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

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4

Center of buoyancy is the

A. Centroid of the displaced volume of fluid

B. Center of pressure of displaced volume

C. Does not exist

D. None of the above

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4

Operation of McLeod gauge used for low pressure measurement is based on the principle of

A. Gas law

B. Boyle's law

C. Charles law

D. Pascal's law

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4

A flow through a long pipe at decreasing rate is called __________ uniform flow.

A. Steady

B. Unsteady

C. Both A and B

D. None of these

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4

One cubic metre of water weighs

A. 100 litres

B. 250 litres

C. 500 litres

D. 1000 litres

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4

The total pressure on the top of a closed cylindrical vessel of radius (r) completely filled up with liquid of specific weight (w) and rotating at (ω) rad/s about its vertical axis, is

A. π w ω² r²/4g

B. π w ω² r³/4g

C. π w ω² r⁴/4g

D. π w ω² r²/2g

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4

The Newton's law of resistance is based on the assumption that the

A. Planes of the body are completely smooth

B. Space around the body is completely filled with the fluid

C. Fluid particles do not exert any influence on one another

D. All of the above

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4

The flow in a pipe or channel is said to be non-uniform when

A. The liquid particles at all sections have the same velocities

B. The liquid particles at different sections have different velocities

C. The quantity of liquid flowing per second is constant

D. Each liquid particle has a definite path

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4

A flow in which the quantity of liquid flowing per second is not constant, is called

A. Streamline flow

B. Turbulent flow

C. Steady flow

D. Unsteady flow

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4

The celerity (velocity) of a pressure wave in a fluid is given by (where K = Bulk modulus, and ρ = Density of the fluid)

A. K.ρ

B. K/ρ

C. ρ/K

D. None of these

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4

The line of action of the buoyant force acts through the

A. Centroid of the volume of fluid vertically above the body

B. Centre of the volume of floating body

C. Center of gravity of any submerged body

D. Centroid of the displaced volume of fluid

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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

The pressure of liquid at throat in a Venturimeter is __________ than that at inlet.

A. Higher

B. Lower

C. Same

D. None of these

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4

The critical depth for a channel is given by (where q = Unit discharge (discharge per unit width) through the channel)

A. (q/g)1/2

B. (q²/g)1/3

C. (q³/g)1/4

D. (q⁴/g)1/5

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4

An error of 1% in measuring head over the crest of the notch (H) will produce an error of __________ in discharge over a triangular notch,

A. 1 %

B. 1.5 %

C. 2 %

D. 2.5 %

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4

The velocity corresponding to Reynold number of 2800, is called

A. Sub-sonic velocity

B. Super-sonic velocity

C. Lower critical velocity

D. Higher critical velocity

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4

Non uniform 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. Velocity, depth, pressure, etc. change from point to point in the fluid flow.

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 error in discharge (dQ/Q) to the error in measurement of head (dH/H) over a triangular notch is given by

A. dQ/Q = 3/2 × (dH/H)

B. dQ/Q = 2 × (dH/H)

C. dQ/Q = 5/2 × (dH/H)

D. dQ/Q = 3 × (dH/H)

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4

A notch is used to measure __________ of liquids.

A. Pressure

B. Discharge

C. Velocity

D. Volume

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4

A manometer is used to measure

A. Low pressure

B. Moderate pressure

C. High pressure

D. Atmospheric pressure

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4

The length of the divergent cone in a Venturimeter is __________ that of the convergent cone.

A. Equal to

B. Double

C. Three to four times

D. Five to six times

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4

An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

A. 1

B. 1.2

C. 0.8

D. 0.75

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4

A Piezometer tube is used only for measuring

A. Low pressure

B. High pressure

C. Moderate pressure

D. Vacuum pressure

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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 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

The value of mass density in kg-sec-V-m⁴ for water at 0°C is

A. 1

B. 1000

C. 100

D. 101.9

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4

All the terms of energy in Bernoulli's equation have dimension of

A. Energy

B. Work

C. Mass

D. Length