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4

For manometer, a better liquid combination is one having

A. Higher surface tension

B. Lower surface tension

C. Surface tension is no criterion

D. High density and viscosity

Correct Answer :

A. Higher surface tension


Related Questions

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4

In a footstep bearing, if the radius of the shaft is doubled, then the torque required to overcome the viscous resistance will be

A. Double

B. Four times

C. Eight times

D. Sixteen times

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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

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

When a cylindrical vessel, containing some liquid, is rotated about its vertical axis, the liquid surface is depressed down at the axis of its rotation and rises up near the walls of the vessel on all sides. This type of flow is known as

A. Steady flow

B. Turbulent flow

C. Vortex flow

D. Uniform flow

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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

A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

A. 1

B. 5

C. 7

D. 6

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4

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

A. One dimensional flow

B. Streamline flow

C. Steady flow

D. Turbulent flow

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4

The center of pressure of a surface subjected to fluid pressure is the point

A. On the surface at which resultant pressure acts

B. On the surface at which gravitational force acts

C. At which all hydraulic forces meet

D. Similar to metacentre

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4

Coefficient of resistance is the ratio of

A. Actual velocity of jet at vena-contracta to the theoretical velocity

B. Area of jet at vena-contracta to the area of orifice

C. Loss of head in the orifice to the head of water available at the exit of the orifice

D. Actual discharge through an orifice to the theoretical discharge

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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

In the case of steady flow of a fluid, the acceleration of any fluid particle is

A. Constant

B. Variable

C. Zero

D. Zero under limiting conditions

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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

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

An opening in the side of a tank or vessel such that the liquid surface with the tank is below the top edge of the opening, is called

A. Weir

B. Notch

C. Orifice

D. None of these

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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

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

The ratio of the inertia force to the elastic force is called

A. Reynold's number

B. Froude's number

C. Weber's number

D. Mach number

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4

The total energy line lies over the hydraulic gradient line by an amount equal to the

A. Pressure head

B. Velocity head

C. Pressure head + velocity head

D. Pressure head - velocity head

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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 highest efficiency is obtained with a channel of __________ section.

A. Circular

B. Square

C. Rectangular

D. Trapezoidal

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4

If 850 kg liquid occupies volume of one cubic meter, men 0.85 represents its

A. Specific weight

B. Specific mass

C. Specific gravity

D. Specific density

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4

One litre of water occupies a volume of

A. 100 cm3

B. 250 cm3

C. 500 cm3

D. 1000 cm3

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4

A body floats in stable equilibrium

A. When its meatcentric height is zero

B. When the metacentre is above C.G.

C. When its e.g. is below its center of buoyancy

D. Metacentre has nothing to do with position of e.g. for determining stability

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4

The tendency of a liquid surface to contract is due to the following property

A. Cohesion

B. Adhesion

C. Viscosity

D. Surface tension

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4

The velocity of the liquid flowing through the divergent portion of a Venturimeter

A. Remains constant

B. Increases

C. Decreases

D. Depends upon mass of liquid

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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

A flow is called super-sonic if the

A. Velocity of flow is very high

B. Discharge is difficult to measure

C. Mach number is between 1 and 6

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

The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

A. μ π³ N² R² /1800 t

B. μ π³ N² R⁴ /1800 t

C. μ π³ N² R² /3600 t

D. μ π³ N² R⁴ /3600 t

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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 %