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4

A pressure of 25 m of head of water is equal to

A. 25 kN/ m²

B. 245 kN/ m²

C. 2500 kN/m²

D. 2.5 kN/ m²

Correct Answer :

B. 245 kN/ m²


Related Questions

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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

An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

A. 1

B. 1.2

C. 0.8

D. 0.75

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4

The total pressure on the surface of a vertical sluice gate 2 m x 1 m with its top 2 m surface being 0.5 m below the water level will be

A. 500 kg

B. 1000 kg

C. 1500 kg

D. 2000 kg

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4

When a liquid is flowing through a pipe, the velocity of the liquid is

A. Maximum at the centre and minimum near the walls

B. Minimum at the centre and maximum near the walls

C. Zero at the centre and maximum near the walls

D. Maximum at the centre and zero near the walls

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4

The total energy of a liquid particle in motion is equal to

A. Pressure energy + kinetic energy + potential energy

B. Pressure energy - (kinetic energy + potential energy)

C. Potential energy - (pressure energy + kinetic energy

D. Kinetic energy - (pressure energy + potential energy)

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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

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

A flow is called super-sonic if the

A. Velocity of flow is very high

B. Discharge is difficult to measure

C. Mach number is between 1 and 6

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 normal stress in a fluid will be constant in all directions at a point only if

A. It is incompressible

B. It has uniform viscosity

C. It has zero viscosity

D. It is at rest

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4

To avoid an interruption in the flow of a siphon, an air vessel is provided

A. At the inlet

B. At the outlet

C. At the summit

D. At any point between inlet and outlet

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4

The discharge through a large rectangular orifice is given by (where H1 = Height of the liquid above the top of the orifice, H2 = Height of the liquid above the bottom of the orifice, b = Breadth of the orifice, and Cd = Coefficient of discharge)

A. Q = (2/3) Cd × b × √(2g) × (H2 - H1)

B. Q = (2/3) Cd × b × √(2g) × (H2 1/2 - H1 1/2)

C. Q = (2/3) Cd × b × √(2g) × (H2 3/2 - H1 3/2)

D. Q = (2/3) Cd × b × √(2g) × (H2 2 - H1 2)

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4

In case of flow through parallel pipes,

A. The head loss for all the pipes is same

B. The total discharge is equal to the sum of discharges in the various pipes

C. The total head loss is the sum of head losses in the various pipes

D. Both (A) and (B)

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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

A piece of metal of specific gravity 13.6 is placed in mercury of specific gravity 13.6, what fraction of it volume is under mercury?

A. The metal piece will simply float over the mercury

B. The metal piece will be immersed in mercury by half

C. Whole of the metal piece will be immersed with its top surface just at mercury level

D. Metal piece will sink to the bottom

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4

The weight per unit volume of a liquid at a standard temperature and pressure is called

A. Specific weight

B. Mass density

C. Specific gravity

D. None of these

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4

Rain drops are spherical because of

A. Viscosity

B. Air resistance

C. Surface tension forces

D. Atmospheric pressure

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4

A piece weighing 3 kg in air was found to weigh 2.5 kg when submerged in water. Its specific gravity is

A. 1

B. 5

C. 7

D. 6

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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

Select the correct statement

A. Weber's number is the ratio of inertia force to elastic force.

B. Weber's number is the ratio of gravity force to surface tension force.

C. Weber's number is the ratio of viscous force to pressure force.

D. Weber's number is the ratio of inertia force to surface tension force.

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4

The pressure at a point 4 m below the free surface of water is

A. 19.24 kPa

B. 29.24 kPa

C. 39.24 kPa

D. 49.24 kPa

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4

The most economical section of a trapezoidal channel is one which has hydraulic mean depth equal to

A. 1/2 × depth

B. 1/2 × breadth

C. 1/2 × sloping side

D. 1/4 × (depth + breadth)

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4

The discharge through a wholly drowned orifice is given by (where H1 = Height of water (on the upstream side) above the top of the orifice, H2 = Height of water (on the downstream side) above the bottom of the orifice, and H = Difference between two water levels on either side of the orifice)

A. Q = Cd × bH₁ × √(2gh)

B. Q = Cd × bH2 × √(2gh)

C. Q = Cd × b (H2 - H1) × √(2gh)

D. Q = Cd × bH × √(2gh)

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4

A pipe of length more than double the diameter of orifice fitted externally or internally to the orifice is called a

A. Notch

B. Weir

C. Mouthpiece

D. Nozzle

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4

The kinematic viscosity is the

A. Ratio of absolute viscosity to the density of the liquid

B. Ratio of density of the liquid to the absolute viscosity

C. Product of absolute viscosity and density of the liquid

D. Product of absolute viscosity and mass of the liquid

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4

For hypersonic flow, the Mach number is

A. Unity

B. Greater than unity

C. Greater than 2

D. Greater than 4

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4

An open vessel of water is accelerated up an inclined plane. The free water surface will

A. Be horizontal

B. Make an angle in direction of inclination of inclined plane

C. Make an angle in opposite direction to inclination of inclined plane

D. Any one of above is possible

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4

Surface tension

A. Acts in the plane of the interface normal to any line in the surface

B. Is also known as capillarity

C. Is a function of the curvature of the interface

D. Decreases with fall in temperature

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4

A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

A. Length of both the pipes is same

B. Diameter of both the pipes is same

C. Loss of head and discharge of both the pipes is same

D. Loss of head and velocity of flow in both the pipes is same

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4

The pressure in Pascals at a depth of 1 m below the free surface of a body of water will be equal to

A. 1 Pa

B. 91 Pa

C. 981 Pa

D. 9810 Pa