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What is the correct answer?

4

The rise or depression of liquid in a tube due to surface tension will increase in size of tube will

A. Increase

B. Remain unaffected

C. May increase or decrease depending on the characteristics of liquid

D. Decrease

Correct Answer :

D. Decrease


Related Questions

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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 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 resultant upward pressure of the fluid on an immersed body due to its tendency to uplift the submerged body is called

A. Up-thrust

B. Reaction

C. Buoyancy

D. Metacentre

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4

The total pressure on the top of a closed cylindrical vessel completely filled up with a liquid is

A. Directly proportional to (radius)2

B. Inversely proportional to (radius)2

C. Directly proportional to (radius)4

D. Inversely proportional to (radius)4

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4

True one-dimensional 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. The magnitude and direction of the velocity do not change from point to point in the fluid

D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

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4

Coefficient of contraction is the ratio of

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

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

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

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

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4

In order to measure the flow with a Venturimeter, it is installed in

A. Horizontal line

B. Inclined line with flow upwards

C. Inclined line with flow downwards

D. Any direction and in any location

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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 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

The top of the weir over which the water flows is known as

A. Sill or crest

B. Nappe or vein

C. Orifice

D. None of these

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4

The specific weight of sea water is __________ that of pure water.

A. Same as

B. Less than

C. More than

D. None of these

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4

The coefficient of viscosity may be determined by

A. Capillary tube method

B. Orifice type viscometer

C. Rotating cylinder method

D. All of these

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4

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

A. N-m/s2

B. N-s/m2

C. Poise

D. Stoke

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4

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

According to Darcy's formula, the loss of head due to friction in the pipe is (where f = Darcy's coefficient, l = Length of pipe, v = Velocity of liquid in pipe, and d = Diameter of pipe)

A. flv²/2gd

B. flv²/gd

C. 3flv²/2gd

D. 4flv²/2gd

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4

The resultant upward pressure of a fluid on a floating body is equal to the weight of the fluid displaced by the body. This definition is according to

A. Buoyancy

B. Equilibrium of a floating body

C. Archimedes' principle

D. Bernoulli's theorem

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4

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

A. Reynold's number

B. Froude's number

C. Weber's number

D. Euler's number

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4

When the Mach number is more than 6, the flow is called

A. Sub-sonic flow

B. Sonic flow

C. Super-sonic flow

D. Hyper-sonic flow

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4

Which of the following is an example of laminar flow?

A. Underground flow

B. Flow past tiny bodies

C. Flow of oil in measuring instruments

D. All of these

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4

In order that flow takes place between two points in a pipeline, the differential pressure between these points must be more than

A. Frictional force

B. Viscosity

C. Surface friction

D. All of the above

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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

Bulk modulus of a fluid __________ as the pressure increases.

A. Remain same

B. Decreases

C. Increases

D. None of these

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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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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

A weir, generally, used as a spillway of a dam is

A. Narrow crested weir

B. Broad crested weir

C. Ogee weir

D. Submerged weir

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4

An internal mouthpiece is said to be running free if the length of the mouthpiece is __________ the diameter of the orifice.

A. Less than twice

B. More than twice

C. Less than three times

D. More than three times

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4

Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as

A. Lift

B. Drag

C. Stagnation pressure

D. Bulk modulus

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4

The normal stress is same in all directions at a point in a fluid

A. Only when the fluid is frictionless

B. Only when the fluid is incompressible and has zero viscosity

C. When there is no motion of one fluid layer relative to an adjacent layer

D. Irrespective of the motion of one fluid layer relative to an adjacent layer

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4

A flow in which the volume of a fluid and its density does not change during the flow is called _________ flow.

A. Incompressible

B. Compressible

C. Viscous

D. None of these

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4

A flow whose streamline is represented by a straight line, is called __________ dimensional flow.

A. One

B. Two

C. Three

D. Four