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4

Dynamic viscosity of most of the gases with rise in temperature

A. Increases

B. Decreases

C. Remain unaffected

D. Unpredictable

Correct Answer :

A. Increases


Related Questions

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4

The power transmitted through a pipe is (where w = Specific weight in N/m3, and Q = Discharge in m3/s)

A. w × Q × H

B. w × Q × hf

C. w × Q (H - hf)

D. w × Q (H + hf)

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4

Choose the wrong statement

A. Viscosity of a fluid is that property which determines the amount of its resistance to a shearing force

B. Viscosity is due primarily to interaction between fluid molecules

C. Viscosity of liquids decreases with increase in temperature

D. Viscosity of liquids is appreciably affected by change in pressure

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4

The force of buoyancy is always __________ the weight of the liquid displaced by the body.

A. Equal to

B. Less than

C. More than

D. None of these

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4

The discharge in an open channel corresponding to critical depth is

A. Zero

B. Minimum

C. Maximum

D. None of these

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4

Pitot tube is used for measurement of

A. Pressure

B. Flow

C. Velocity

D. Discharge

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4

The viscosity of water is __________ than that of mercury.

A. Higher

B. Lower

C. Same as

D. None of these

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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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4

The velocity corresponding to Reynold number of 2000 is called

A. Sub-sonic velocity

B. Super-sonic velocity

C. Lower critical velocity

D. Higher critical velocity

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4

The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

A. μ π³ N² R² /1800 t

B. μ π³ N² R⁴ /1800 t

C. μ π³ N² R² /3600 t

D. μ π³ N² R⁴ /3600 t

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4

Venturimeter is used to

A. Measure the velocity of a flowing liquid

B. Measure the pressure of a flowing liquid

C. Measure the discharge of liquid flowing in a pipe

D. Measure the pressure difference of liquid flowing between two points in a pipe line

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4

When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is

A. ω.r/2g

B. ω².r²/2g

C. ω.r/4g

D. ω².r²/4g

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4

If no resistance is encountered by displacement, such a substance is known as

A. Fluid

B. Water

C. Gas

D. Ideal fluid

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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

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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4

In an internal mouthpiece, if the jet after contraction does not touch the sides of the mouthpiece, then the mouthpiece is said to be

A. Running full

B. Running free

C. Partially running full

D. Partially running free

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4

Fluid is a substance which offers no resistance to change of

A. Pressure

B. Flow

C. Shape

D. Volume

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4

An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

A. tanθ = a/g

B. tanθ = 2 a/g

C. tanθ = a/2g

D. tanθ = a2/2g

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4

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

A. 5 mm

B. 10 mm

C. 20 mm

D. 30 mm

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4

The resultant upward pressure of the fluid on an immersed body is called

A. Up-thrust

B. Buoyancy

C. Center of pressure

D. All the above are correct

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4

The property of fluid by virtue of which it offers resistance to shear is called

A. Surface tension

B. Adhesion

C. Cohesion

D. Viscosity

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4

An internal mouthpiece is said to be running __________ if the length of the mouthpiece is more than three times the diameter of the orifice.

A. Free

B. Partially

C. Full

D. None of these

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4

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

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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

The loss of head due to viscosity for laminar flow in pipes is (where d = Diameter of pipe, l = Length of pipe, v = Velocity of the liquid in the pipe, μ = Viscosity of the liquid, and w = Specific weight of the flowing liquid)

A. 4μvl/wd²

B. 8μvl/wd²

C. 16μvl/wd²

D. 32μvl/wd²

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4

The ratio of the inertia force to the __________ is called Euler's number.

A. Pressure force

B. Elastic force

C. Surface tension force

D. Viscous force

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4

According to Francis formula, the discharge over a rectangular weir is (where n = Number of end contractions)

A. (2/3) × Cd (L - nH) × √(2gh)

B. (2/3) × Cd (L - 0.1nH) × √(2g) × H3/2

C. (2/3) × Cd (L - nH) × √(2g) × H²

D. (2/3) × Cd (L - nH) × √(2g) × H5/2

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4

The mass of 2.5 m3 of a certain liquid is 2 tonnes. Its mass density is

A. 200 kg/m3

B. 400 kg/m3

C. 600 kg/m3

D. 800 kg/m3

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4

A metal with specific gravity of a floating in a fluid of same specific gravity a will

A. Sink to bottom

B. Float over fluid

C. Partly immersed

D. Be fully immersed with top surface at fluid surface

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4

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