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Q1. | In a broad-crested weir, the discharge is maximum if the head of water on the downstream side of weir is __________ the head of water on the upstream side of weir. |

A. | equal to [Wrong Answer] |

B. | one-third [Wrong Answer] |

C. | two-third [Correct Answer] |

D. | three-fourth [Wrong Answer] |

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Explanation:-
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⇒ The hydraulic mean depth or the hydraulic radius is the ratio of.

area of flow and wetted perimeter

wetted perimeter and diameter of pipe

velocity of flow and area of flow

none of these

⇒ Venturimeter is used to.

measure the velocity of a flowing liquid

measure the pressure of a flowing liquid

measure the discharge of liquid flowing in a pipe

measure the pressure difference of liquid flowing between two points in a pipe line

⇒ The unit of surface tension is.

N/m

N/m2

N/m3

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⇒ When a body is placed over a liquid, it is subjected to gravitational force and upthrust of the liquid.

True

False

Both (a) and (b)

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⇒ The velocity at which the turbulent flow starts is known as higher critical velocity.

Yes

No

Both (a) and (b)

None of these

⇒ An error of 1% in measuring head over the crest of the notch (

*H*) will produce an error of __________ in discharge over a triangular notch,

1%

1.5%

2%

2.5%

⇒ When the pipes are in series, the total head loss is equal to the sum of the head loss in each pipe.

Yes

No

Both (a) and (b)

None of these

⇒ A fluid having no viscosity is known as.

real fluid

ideal fluid

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non-newtonian fluid

⇒ The specific gravity of water is taken as.

0.001

0.01

0.1

1

⇒ The depth of water in a channel corresponding to the minimum specific energy is known as critical depth.

Agree

Disagree

Both (a) and (b)

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⇒ The most efficient section of a channel is.

triangular

rectangular

square

trapezoidal

⇒ The ratio of the inertia force to the viscous force is called.

Reynold's number

Froude's number

Weber's number

Euler's number

⇒ A flow is called sonic, if the Mach number is unity.

Agree

Disagree

Both (a) and (b)

None of these

⇒ In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be.

double

four times

eight times

sixteen times

⇒ The product of mass and accelaration of flowing liquid is called.

inertia force

viscous force

gravity force

pressure force

⇒ In a venturiflume, the flow takes place at.

atmospheric pressure

gauge pressure

absolute pressure

none of these

⇒ The pressure of liquid at throat in a venturimeter is __________ than that at inlet.

higher

lower

both (a) and (b)

none of these.

⇒ A flow whose streamline is represented by a straight line, is called __________ dimensional flow.

one

two

three

four

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

directly proportional

inversely proportional

Both (a) and (b)

none of these.

⇒ When a cylindrical vessel containing liquid is revolved, the surface of the liquid takes the shape of.

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a paraboloid

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⇒ The reciprocal of Euler's number is called Newton number.

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⇒ The hydraulic gradient line lies over the centre line of the pipe by an amount equal to the.

pressure head

velocity head

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pressure head - velocity head

⇒ The mass per unit volume of a liquid at a standard temperature and pressure is called.

specific weight

mass density

specific gravity

none of these

⇒ The intensity of pressure on an immersed surface __________ with the increase in depth.

does not change

increases

decreases

none of these

⇒ The flow at critical depth in an open channel is called torrential flow.

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No

Both (a) and (b)

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⇒ When a body, floating in a liquid, is given a small angular displacement, it starts oscillating about a point known as.

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⇒ The height of a water column equivalent to a pressure of 0.15 MPa is.

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⇒ A fluid which obeys the Newton's law of viscosity is termed as.

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⇒ In open channels, the specific energy is the.

total energy per unit discharge

total energy measured with respect to the datum passing through the bottom of the channel

total energy measured above the horizontal datum

kinetic energy plotted above the free surface of water

⇒ 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