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Q1. | A flow is called hyper-sonic, if the Mach number is. |

A. | less than unity [Wrong Answer] |

B. | unity [Wrong Answer] |

C. | between 1 and 6 [Wrong Answer] |

D. | none of these [Correct Answer] |

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**Also Read Similar Questions Below :**

⇒ The Newton's law of resistance is based on the assumption that the.

planes of the body are completely smooth

space around the body is completely filled with the fluid

fluid particles do not exert any influence on one another

all of the above

⇒ Water is a __________ fluid.

real

ideal

newtonian

non-newtonian

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

19.24 kPa

29.24 kPa

39.24 kPa

49.24 kPa

⇒ The discharge over a triangular notch is.

inversely proportional to H3/2

directly proportional to H3/2

inversely proportional to H5/2

directly proportional to H5/2

⇒ The flow in a pipe or channel is said to be non-uniform when.

the liquid particles at all sections have the same velocities

the liquid particles at different sections have different velocities

the quantity of liquid flowing per second is constant

each liquid particle has a definite path

⇒ A thick liquid like a syrup has a __________ viscosity than a light liquid like water.

lesser

greater

both (a) and (b)

none of these.

⇒ One cubic metre of water weighs.

100 litres

250 litres

500 litres

1000 litres

⇒ The value of bulk modulus of a fluid is required to determine.

Reynold's number

Froude's number

Mach number

Euler's number

⇒ Select the correct statement.

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

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

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

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

⇒ The power transmitted through the nozzle is maximum when the head lost due to friction in the pipe is __________ of the total supply head.

one-half

one-third

two-third

None of these

⇒ The specific weight is also known as weight density.

Correct

Incorrect

Both (a) and (b)

None of these

⇒ The Francis formula for the discharge over Cippoletti weir is.

1.84 LH1/2

1.84 LH

1.84 LH3/2

1.84 LH5/2

⇒ The viscosity of a liquid __________ its rate of flow through a hole in a vessel.

effects

does not effect

Both (a) and (b)

None of these

⇒ The hammer blow in pipes occurs when.

there is excessive leakage in the pipe

the pipe bursts under high pressure of fluid

the flow of fluid through the pipe is suddenly brought to rest by closing of the valve

the flow of fluid through the pipe is gradually brought to rest by closing of the valve

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

pressure force

elastic force

surface tension force

viscous force

⇒ Poise is the unit of viscosity in C.G.S. system of units.

Agree

Disagree

Both (a) and (b)

None of these

⇒ According to Bazin, the coefficient of discharge varies with the height of water over the sill of a weir.

Correct

Incorrect

Both (a) and (b)

none of these

⇒ In an internal mouthpiece, if the jet after contraction expands and fills up the whole mouthpiece, then the mouthpiece is said to be running free.

True

False

Both (a) and (b)

None of these

⇒ The Bernoulli's equation is based on the assumption that.

there is no loss of energy of the liquid flowing

the velocity of flow is uniform across any cross-section of the pipe

no force except gravity acts on the fluid

all of the above

⇒ The ratio of the inertia force to the surface tension force is called Weber's number.

Correct

Incorrect

Both (a) and (b)

None of these

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

N-m/s2

N-s/m2

poise

stoke

⇒ A venturiflume is a flumed structure constructed across a channel by restricting its width.

True

False

Both (a) and (b)

None of these

⇒ The pressure measured with the help of a piezometer tube is in.

N/mm2

N/m2

head of liquid

all of these

⇒ In a sharp-crested weir, the thickness of the weir is kept less than half of the height of water above the crest of the weir.

True

False

Both (a) and (b)

None of these

⇒ With an increase in size of tube, the rise or depression of liquid in the tube due to surface tension will.

decrease

increase

remain unchanged

depend upon the characteristics of liquid

⇒ In two dimensional flow, the flow does not take place in a curve.

True

False

Both (a) and (b)

None of these

⇒ Bulk modulus of a fluid __________ as the pressure increases.

remains same

remains same

increases

none of these.

⇒ The purpose of a surge tank is.

to control the pressure variations due to rapid changes in the pipe line flow

to eliminate water hammer possibilities

to regulate flow of water to turbines by providing necessary retarding head of water

all of the above

⇒ A flow whose streamline is represented by a curve, is called.

one-dimensional flow

two-dimensional flow

three-dimensional flow

four-dimensional flow

⇒ In an external mouthpiece, the absolute pressure head at vena contracta is __________ the atmospheric pressure head by an amount equal to 0.89 times the height of the liquid, above the vena contracta.

less than

more than

Both (a) and (b)

none of these.