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What is the correct answer?

4

The vapour pressure over the concave surface is

A. Less man the vapour pressure over the plane surface

B. Equal to the vapour pressure over the plane surface

C. Greater than the vapour pressure over the plane surface

D. Zero

Correct Answer :

A. Less man the vapour pressure over the plane surface


Related Questions

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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

The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

A. wA

B. wx

C. wAx

D. wA/x

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4

The mercury does not wet the glass. This is due to the property of the liquid known as

A. Cohesion

B. Adhesion

C. Viscosity

D. Surface tension

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4

The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

A. Equal to

B. One-half

C. Three fourth

D. Double

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4

The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

A. Surface tension

B. Compressibility

C. Capillarity

D. Viscosity

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4

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?

A. The pressure on the wall at the liquid level is minimum

B. The pressure on the bottom of the wall is maximum

C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum

D. The pressure on the bottom of the wall is zer

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4

The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

A. 1 Pa

B. 91 Pa

C. 981 Pa

D. 9810 Pa

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4

The pressure measured with the help of a Piezometer tube is in

A. N/mm2

B. N/m2

C. Head of liquid

D. All of these

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4

A model of torpedo is tested in a towing tank at a velocity of 25 m/sec. The prototype is expected to attain a velocity of 5 m/sec. What model scale has been used?

A. 1 : 5

B. 1 : 2.5

C. 1 : 25

D. 1 : √5

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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 resultant of all normal pressures acts

A. At C.G. of body

B. At center of pressure

C. Vertically upwards

D. At metacentre

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4

A channel is said to be of most economical cross-section, if

A. It gives maximum discharge for a given cross-sectional area and bed slope

B. It has minimum wetted perimeter

C. It involves lesser excavation for the designed amount of discharge

D. All of the above

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4

The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid.

A. Equal to

B. Less than

C. More than

D. None of these

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4

When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called

A. Gauge pressure

B. Absolute pressure

C. Positive gauge pressure

D. Vacuum pressure

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4

A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

A. 0.83

B. 0.6

C. 0.4

D. 0.3

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4

In case of flow through parallel pipes,

A. The head loss for all the pipes is same

B. The total discharge is equal to the sum of discharges in the various pipes

C. The total head loss is the sum of head losses in the various pipes

D. Both (A) and (B)

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4

With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will

A. Decrease

B. Increase

C. Remain unchanged

D. Depend upon the characteristics of liquid

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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

The discharge over a triangular notch is

A. Inversely proportional to H3/2

B. Directly proportional to H3/2

C. Inversely proportional to H5/2

D. Directly proportional to H5/2

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4

A perfect gas

A. Has constant viscosity

B. Has zero viscosity

C. Is in compressible

D. None of the above

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4

In a free vortex motion, the radial component of velocity everywhere is

A. Maximum

B. Minimum

C. Zero

D. Nonzero and finite

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4

Flow occurring in a pipeline when a valve is being opened is

A. Steady

B. Unsteady

C. Laminar

D. Vortex

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4

The pressure measured with the help of a pressure gauge is called

A. Atmospheric pressure

B. Gauge pressure

C. Absolute pressure

D. Mean pressure

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4

A flow is called sub-sonic, if the Mach number is

A. Less than unity

B. Unity

C. Between 1 and 6

D. More than 6

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4

The ratio of absolute viscosity to mass density is known as

A. Specific viscosity

B. Viscosity index

C. Kinematic viscosity

D. Coefficient of viscosity

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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

A bucket of water is hanging from a spring balance. An iron piece is suspended into water without touching sides of bucket from another support. The spring balance reading will

A. Increase

B. Decrease

C. Remain same

D. Increase/decrease depending on depth of immersion

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4

The Bernoulli's equation is based on the assumption that

A. There is no loss of energy of the liquid flowing

B. The velocity of flow is uniform across any cross-section of the pipe

C. No force except gravity acts on the fluid

D. All of the above

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4

The intensity of pressure at any point, in a liquid, is

A. Directly proportional to the area of the vessel containing liquid

B. Directly proportional to the depth of liquid from the surface

C. Directly proportional to the length of the vessel containing liquid

D. Inversely proportional to the depth of liquid from the surface

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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 %