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Q1. | The density of air is same at different heights. |

A. | Correct. [Wrong Answer] |

B. | Incorrect [Correct Answer] |

C. | Both (a) and (b) [Wrong Answer] |

D. | None of these [Wrong Answer] |

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**Also Read Similar Questions Below :**

⇒ The discharge through a convergent mouthpiece is __________ the discharge through an internal mouthpiece of the same diameter and head of water.

equal to

one-half

three fourth

double

⇒ The atmospheric pressure at sea level is.

103 kN/m2

10.3 m of water

760 mm of mercury

all of these

⇒ Surface tension force is the product of surface tension per unit length and cross-sectional area of flow.

Correct

Incorrect

Both (a) and (b)

None of these

⇒ 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

⇒ In one dimensional flow, the flow.

is steady and uniform

takes place in straight line

takes place in curve

takes place in one direction

⇒ 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.

⇒ 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

⇒ The velocity at which the laminar flow stops, is known as.

velocity of approach

lower critical velocity

higher critical velocity

none of these

⇒ A water tank contains 1.3 m deep water. The pressure exerted by the water per metre length of the tank is.

2.89 kN

8.29 kN

9.28 kN

28.9 kN

⇒ The force exerted by a moving fluid on an immersed body is directly proportional to the rate of change of momentum due to the presence of the body. This statement is called.

Newton's law of motion

Newton's law of cooling

Newton's law of viscosity

Newton's law of resistance

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

Yes

No

Both (a) and (b)

None of these

⇒ In a venturimeter, the velocity of liquid at throat is __________ than at inlet.

higher

lower

Both (a) and (b)

None of these

⇒ The coefficient of viscosity may be determined by.

capillary tube method

orifice type viscometer

rotating cylinder method

all of these

⇒ One poise is equal to.

0.1 N-s/m2

1 N-s/m2

10 N-s/m2

100 N-s/m2

⇒ 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

⇒ If the coefficient of discharge is 0.6, then the discharge over a right angled notch is.

0.417 H5/2

1.417 H5/2

4.171 H5/2

7.141 H5/2

⇒ According to Pascal's law, the intensity of pressure at any point in a fluid at rest is the same in all directions.

Agree

Disagree

Both (a) and (b)

None of these

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

Reynold's number

Froude's number

Mach number

Euler's number

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

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

1%

1.5%

2%

2.5%

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

True

False

Both (a) and (b)

None of these

⇒ When the pressure intensity at a point is more than the local atmospheric pressure, then the difference of these two pressures is called.

gauge pressure

absolute pressure

positive gauge pressure

vacuum pressure

⇒ The ratio of velocity of fluid in an undisturbed stream to the velocity of sound wave is known as Mach number.

Yes

No

Both (a) and (b)

None of these

⇒ The discharge through a channel of rectangular section will be maximum, if.

its depth is twice the breadth

ts breadth is twice the depth

its depth is thrice the breadth

its breadth is thrice the depth

⇒ 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.

equal to

one-third

two-third

three-fourth

⇒ A flow in which the quantity of liquid flowing per second is not constant, is called.

streamline flow

turbulent flow

steady flow

unsteady flow

⇒ The divergent portion of a venturimeter is made longer than convergent portion in order to.

avoid the tendency of breaking away the stream of liquid

to minimise frictional losses

both (a) and (b)

none of these

⇒ The most efficient section of a channel is.

triangular

rectangular

square

trapezoidal

⇒ Bernoulli's equation is applied to.

venturimeter

orifice meter

pitot tube

all of these

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

centre of pressure

centre of gravity

centre of buoyancy

metacentre

⇒ The coefficient of discharge for an external mouthpiece depends upon.

velocity of liquid

pressure of liquid

area of mouthpiece

length of mouthpiece