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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

Correct Answer :

B. Unsteady


Related Questions

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A fluid is said to be ideal, if it is

A. Incompressible

B. Viscous and incompressible

C. Inviscous and compressible

D. Inviscous and incompressible

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4

Choose the wrong statement. Alcohol is used in manometer, because

A. Its vapour pressure is low

B. It provides suitable meniscus for the inclined tube

C. Its density is less

D. It provides longer length for a given pressure difference

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An ideal flow of any fluid must satisfy

A. Pascal law

B. Newton's law of viscosity

C. Boundary layer theory

D. Continuity equation

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Which of the following statement is wrong?

A. A flow whose streamline is represented by a curve is called two dimensional flow.

B. The total energy of a liquid particle is the sum of potential energy, kinetic energy and pressure energy.

C. The length of divergent portion in a Venturimeter is equal to the convergent portion.

D. A pitot tube is used to measure the velocity of flow at the required point in a pipe.

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4

The meatcentric height of a ship is 0.6 m and the radius of gyration is 4 m. The time of rolling of a ship is

A. 4.1 s

B. 5.2 s

C. 10.4 s

D. 14.1 s

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4

In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

A. Equal to

B. One-fourth

C. One-third

D. One-half

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4

The intensity of pressure at any point, in a liquid, is

A. Directly proportional to the area of the vessel containing liquid

B. Directly proportional to the depth of liquid from the surface

C. Directly proportional to the length of the vessel containing liquid

D. Inversely proportional to the depth of liquid from the surface

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Steady 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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The stress-strain relation of the Newtonian fluid is

A. Linear

B. Parabolic

C. Hyperbolic

D. Inverse type

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Newton's law of viscosity is a relationship between

A. Pressure, velocity and temperature

B. Shear stress and rate of shear strain

C. Shear stress and velocity

D. Rate of shear strain and temperature

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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

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4

Which of the following manometer has highest sensitivity?

A. U-tube with water

B. Inclined U-tube

C. U-tube with mercury

D. Micro-manometer with water

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4

When the water level on the downstream side of a weir is above the top surface of a weir, the weir is known as

A. Narrow-crested weir

B. Broad-crested weir

C. Ogee weir

D. Submerged weir

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4

A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

A. 4.5 kN/m3

B. 6 kN/m3

C. 7.5 kN/m3

D. 10 kN/m3

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Property of a fluid by which molecules of different kinds of fluids are attracted to each other is called

A. Adhesion

B. Cohesion

C. Viscosity

D. Compressibility

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Choose the wrong statement

A. The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface

B. The horizontal component acts through the center of pressure for the vertical projection

C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

D. The vertical component passes through the center of pressure of the volume

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4

Choose the wrong statement

A. The center of buoyancy is located at the center of gravity of the displaced liquid

B. For stability of a submerged body, the center of gravity of body must lie directly below the center of buoyancy

C. If C.G. and center of buoyancy coincide, the submerged body must lie at neutral equilibrium for all positions

D. All floating bodies are stable

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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

In a forced vortex, the velocity of flow everywhere within the fluid is

A. Maximum

B. Minimum

C. Zero

D. Nonzero finite

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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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A flow is called hyper-sonic, if the Mach number is

A. Less than unity

B. Unity

C. Between 1 and 6

D. None of these

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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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The specific gravity of an oil whose specific weight is 7.85 kN/m3, is

A. 0.8

B. 1

C. 1.2

D. 1.6

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The body will float if the force of buoyancy is __________ the weight of the liquid displaced.

A. Equal to

B. Less than

C. More than

D. None of these

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Kinematic viscosity is equal to

A. Dynamic viscosity/density

B. Dynamic viscosity × density

C. Density/dynamic viscosity

D. 1/dynamic viscosity × density

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The Metacentric heights of two floating bodies A and B are 1 m and 1.5 m respectively. Select the correct statement.

A. The bodies A and B have equal stability

B. The body A is more stable than body B

C. The body B is more stable than body A

D. The bodies A and B are unstable

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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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The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

A. wA

B. wx

C. wAx

D. wA/x

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The region between the separation streamline and the boundary surface of the solid body is known as

A. Wake

B. Drag

C. Lift

D. Boundary layer

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The unit of viscosity is

A. Metres² per sec

B. kg-sec/metre

C. Newton-sec per metre²

D. Newton-sec per meter