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4

The property of a fluid which enables it to resist tensile stress is known as

A. Compressibility

B. Surface tension

C. Cohesion

D. Adhesion

Correct Answer :

C. Cohesion


Related Questions

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4

The discharge over the trapezoidal notch is equal to the discharge over the rectangular notch __________ the discharge over the triangular notch.

A. Plus

B. Minus

C. Divide

D. None of these

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4

According to Bernoulli's equation

A. Z + p/w + v²/2g = constant

B. Z + p/w - v²/2g = constant

C. Z - p/w + v²/2g = constant

D. Z - p/w - v²/2g = constant

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4

The Reynold's number of a ship is __________ to its velocity and length.

A. Directly proportional

B. Inversely proportional

C. Square root of velocity

D. None of these

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4

The stability of a dam is checked for

A. Tension at the base

B. Overturning of the wall or dam

C. Sliding of the wall or dam

D. All of these

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4

The maximum efficiency of transmission through a pipe is

A. 50 %

B. 56.7 %

C. 66.67 %

D. 76.66 %

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4

Practical fluids

A. Are viscous

B. Possess surface tension

C. Are compressible

D. Possess all the above properties

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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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4

Two pipe systems can be said to be equivalent, when the following quantities are same

A. Friction loss and flow

B. Length and diameter

C. Flow and length

D. Friction factor and diameter

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4

Principle of similitude forms the basis of

A. Comparing two identical equipments

B. Designing models so that the result can be converted to prototypes

C. Comparing similarity between design and actual equipment

D. Hydraulic designs

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4

The specific gravity of water is taken as

A. 0.001

B. 0.01

C. 0.1

D. 1

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4

The hydraulic mean depth or the hydraulic radius is the ratio of

A. Area of flow and wetted perimeter

B. Wetted perimeter and diameter of pipe

C. Velocity of flow and area of flow

D. None of these

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4

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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4

A weir is said to be broad 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

Buoyant force is

A. Resultant force acting on a floating body

B. Equal to the volume of liquid displaced

C. Force necessary to keep a body in equilibrium

D. The resultant force on a body due to the fluid surrounding it

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4

A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

A. (bd²/12) + x

B. (d²/12 x) + x

C. b²/12 + x

D. d²/12 + x

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4

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 surface tension of mercury at normal temperature is __________ that of water.

A. Same as

B. Lower than

C. Higher than

D. None of these

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4

Flow of water in a pipe about 3 metres in diameter can be measured by

A. Orifice plate

B. Venturimeter

C. Rotameter

D. Pitot tube

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4

The Francis formula for the discharge over Cipoletti weir is

A. 1.84 LH1/2

B. 1.84 LH

C. 1.84 LH3/2

D. 1.84 LH5/2

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4

A balloon lifting in air follows the following principle

A. Law of gravitation

B. Archimedes principle

C. Principle of buoyancy

D. All of the above

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4

The hydraulic gradient line lies over the centre line of the pipe 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 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 specific weight of water in S.I. units is taken as

A. 9.81 kN/m3

B. 9.81 × 103 N/m3

C. 9.81 × 10-6 N/mm3

D. Any one of these

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4

The shear stress between the two liquid layers is __________ proportional to the distance between two layers.

A. Directly

B. Inversely

C. Both A and B

D. None of these

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4

The sheet of water flowing over a notch or a weir is known as

A. Sill or crest

B. Nappe or vein

C. Orifice

D. None of these

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4

A tank of uniform cross-sectional area (A) containing liquid upto height (H1) has an orifice of cross-sectional area (a) at its bottom. The time required to bring the liquid level from H1 to H2 will be

A. 2A × √H₁/Cd × a × √(2g)

B. 2A × √H₂/Cd × a × √(2g)

C. 2A × (√H₁ - √H₂)/Cd × a × √(2g)

D. 2A × (√H3/2 - √H3/2)/Cd × a × √(2g)

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4

The discharge through a siphon spillway is

A. Cd × a × √(2gH)

B. Cd × a × √(2g) × H3/2

C. Cd × a × √(2g) × H2

D. Cd × a × √(2g) × H5/2

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4

The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

A. μπ²NR/60t

B. μπ²NR²/60t

C. μπ²NR³/60t

D. μπ²NR⁴/60t

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4

Choose the correct relationship

A. Specific gravity = gravity × density

B. Dynamic viscosity = kinematic viscosity × density

C. Gravity = specific gravity × density

D. Kinematic viscosity = dynamic viscosity × density

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4

Fluid is a substance which offers no resistance to change of

A. Pressure

B. Flow

C. Shape

D. Volume