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4

If mercury in a barometer is replaced by water, the height of 3.75 cm of mercury will be following cm of water

A. 51 cm

B. 50 cm

C. 52 cm

D. 52.2 cm

Correct Answer :

A. 51 cm


Related Questions

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4

The atmospheric pressure with rise in altitude decreases

A. Linearly

B. First slowly and then steeply

C. First steeply and then gradually

D. Unpredictable

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4

The meatcentric height is the distance between the

A. Centre of gravity of the floating body and the centre of buoyancy

B. Centre of gravity of the floating body and the metacentre

C. Metacentre and centre of buoyancy

D. Original centre of buoyancy and new centre of buoyancy

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4

A weir is said to be narrow-crested weir, if the width of the crest of the weir is __________ half the height of water above the weir crest.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

A. Q = (2/3) Cd × b × √(2g) × (H2 - H1)

B. Q = (2/3) Cd × b × √(2g) × (H2 1/2 - H1 1/2)

C. Q = (2/3) Cd × b × √(2g) × (H2 3/2 - H1 3/2)

D. Q = (2/3) Cd × b × √(2g) × (H2 2 - H1 2)

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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 conditions for the stable equilibrium of a floating body are

A. The metacentre should lie above the center of gravity

B. The center of buoyancy and the center of gravity must lie on the same vertical line

C. A righting couple should be formed

D. All the above are correct

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4

The units of kinematic viscosity are

A. Metres² per sec

B. kg sec/metre

C. Newton-sec per metre

D. Newton-sec per metre

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4

When a body is placed over a liquid, it will float if

A. Gravitational force is equal to the up-thrust of the liquid

B. Gravitational force is less than the up-thrust of the liquid

C. Gravitational force is more than the up-thrust of the liquid

D. None of the above

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4

If w is the specific weight of liquid and k the depth of any point from the surface, then pressure intensity at that point will be

A. h

B. wh

C. w/h

D. h/w

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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

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The ratio of specific weight of a liquid to the specific weight of pure water at a standard temperature is called

A. Density of liquid

B. Specific gravity of liquid

C. Compressibility of liquid

D. Surface tension of liquid

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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

The pressure at a point in a fluid will not be same in all the directions when the fluid is

A. Moving

B. Viscous

C. Viscous and static

D. Viscous and moving

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The weight per unit volume of a liquid at a standard temperature and pressure is called

A. Specific weight

B. Mass density

C. Specific gravity

D. None of these

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4

A pitot tube is used to measure the

A. Velocity of flow at the required point in a pipe

B. Pressure difference between two points in a pipe

C. Total pressure of liquid flowing in a pipe

D. Discharge through a pipe

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4

If the depth of water in an open channel is less than the critical depth, the flow is called

A. Critical flow

B. Turbulent flow

C. Tranquil flow

D. Torrential flow

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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

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. The total pressure on the wall acts at a distance __________ from the liquid surface.

A. H/3

B. H/2

C. 2H/3

D. 3H/4

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4

For a perfect incompressible liquid, flowing in a continuous stream, the total energy of a particle remains the same, while the particle moves from one point to another. This statement is called

A. Continuity equation

B. Bernoulli's equation

C. Pascal's law

D. Archimedess principle

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Hydrometer is used to determine

A. Specific gravity of liquids

B. Specific gravity of solids

C. Specific gravity of gases

D. Relative humidity

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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

For a body floating in a liquid the normal pressure exerted by the liquid acts at

A. Bottom surface of the body

B. C.G. of the body

C. Metacentre

D. All points on the surface of the body

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4

Piezometer is used to measure

A. Pressure in pipe, channels etc.

B. Atmospheric pressure

C. Very low pressures

D. Difference of pressure between two points

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Select the correct statement

A. Local atmospheric pressure depends upon elevation of locality only

B. Standard atmospheric pressure is the mean local atmospheric pressure a* sea level

C. Local atmospheric pressure is always below standard atmospheric pressure

D. A barometer reads the difference between local and standard atmospheric pressure

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4

The velocity through a channel of circular section will be maximum when the depth of water is __________ the diameter of the circular channel.

A. 0.34 times

B. 0.67 times

C. 0.81 times

D. 0.95 times

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Euler's number is the ratio of __________ force to pressure force.

A. Inertia

B. Gravity

C. Viscous

D. None 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 upper surface of a weir over which water flows is known is

A. Crest

B. Nappy

C. Sill

D. Weir top

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Gradually varied flow is

A. Steady uniform

B. Non-steady non-uniform

C. Non-steady uniform

D. Steady non-uniform

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Bulk modulus of a fluid is the ratio of

A. Shear stress to shear strain

B. Increase in volume to the viscosity of fluid

C. Increase in pressure to the volumetric strain

D. Critical velocity to the viscosity of fluid