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4

Alcohol is used in manometers because

A. It has low vapour pressure

B. It is clearly visible

C. It has low surface tension

D. It can provide longer column due to low density

Correct Answer :

D. It can provide longer column due to low density


Related Questions

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The viscosity of water at 20°C is

A. One stoke

B. One centistoke

C. One poise

D. One centipoise

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The unit of kinematic viscosity in S. I. units is

A. N-m/s

B. N-s/m2

C. m2/s

D. N-m

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4

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

A. Vacuum pressure

B. Gauge pressure

C. Absolute pressure

D. Atmospheric pressure

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Bulk modulus of a fluid __________ as the pressure increases.

A. Remain same

B. Decreases

C. Increases

D. None of these

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The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.

A. One-half

B. One-third

C. Two-third

D. None of these

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4

The bulk modulus of elasticity with increase in pressure

A. Increases

B. Decreases

C. Remain constant

D. Increases first up to certain limit and then decreases

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4

The discharge over a right angled notch is (where H = Height of liquid above the apex of notch)

A. (8/15) Cd. 2g. H

B. (8/15) Cd. 2g. H3/2

C. (8/15) Cd. 2g. H²

D. (8/15) Cd. 2g. H5/2

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Center of pressure compared to e.g. is

A. Above it

B. Below it

C. At same point

D. Above or below depending on area of body

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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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The centre of pressure acts __________ the centre of gravity of immersed surface.

A. At

B. Above

C. Below

D. None of these

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The imaginary line drawn in the fluid in such a way that the tangent to any point gives the direction of motion at that point, is known as

A. Path line

B. Stream line

C. Steak line

D. Potential line

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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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A piece of metal of specific gravity 7 floats in mercury of specific gravity 13.6. What fraction of its volume is under mercury?

A. 0.5

B. 0.4

C. 0.515

D. 0.5

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The intensity of pressure on an immersed surface __________ with the increase in depth.

A. Does not change

B. Increases

C. Decreases

D. None of these

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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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The stress-strain relation of the Newtonian fluid is

A. Linear

B. Parabolic

C. Hyperbolic

D. Inverse type

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The factional resistance of a pipe varies approximately with __________ of the liquid.

A. Pressure

B. Velocity

C. Square of velocity

D. Cube of velocity

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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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In order to avoid tendency of separation at throat in a Venturimeter, the ratio of the diameter at throat to the diameter of pipe should be

A. 1/16 to 1/8

B. 1/8 to 1/4

C. 1/4 to 1/3

D. 1/3 to 1/2

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A fluid which obeys the Newton's law of viscosity is termed as

A. Real fluid

B. Ideal fluid

C. Newtonian fluid

D. Non-Newtonian fluid

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Ratio of inertia force to elastic force is known as

A. Mach number

B. Froude number

C. Reynolds number

D. Weber's number

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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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Metacentric height is the distance between the metacentre and

A. Water surface

B. Center of pressure

C. Center of gravity

D. Center of buoyancy

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When the flow parameters at any given instant remain same at every point, then flow is said to be

A. Quasi-static

B. Steady state

C. Laminar

D. Uniform

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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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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

When a cylindrical vessel containing liquid is revolved about its vertical axis at a constant angular velocity, the pressure

A. Varies as the square of the radial distance

B. Increases linearly as its radial distance

C. Increases as the square of the radial distance

D. Decreases as the square of the radial distance

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4

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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The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly contracted to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden contraction, assuming coefficient of contraction as 0.62, is

A. v₁²/2g

B. v₂²/2g

C. 0.5 v₁²/2g

D. 0.375 v₂²/2g

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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