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Q1. | The position of center of pressure on a plane surface immersed vertically in a static mass of fluid is. |

A. | at the centroid of the submerged area [Wrong Answer] |

B. | always above the centroid of the area [Wrong Answer] |

C. | always below the centroid of the area [Correct Answer] |

D. | none of the above [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ The depth 'd' below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be

0.423 D

0.577 D

0.223 D

0.707 D

⇒ When a liquid rotates at a constant angular velocity about a vertical axis as a rigid body, the pressure intensity varies

linearly with radial distance

as the square of the radial distance

inversely as the square of the radial distance

inversely as the radial distance

⇒ Two pipe systems are said to be equivalent when

head loss and discharge are same in two systems

length of pipe and discharge are same in two systems

friction factor and length are same in two systems

length and diameter are same in two systems

⇒ In series-pipe problems

the head loss is same through each pipe

the discharge is same through each pipe

a trial solution is not necessary

the discharge through each pipe is added to obtain total discharge

⇒ When a body is wholly or partially immersed in liquid it appears to lose weight. This loss of weight is equal to the weight of

Water displaced by the body

Weight of liquid displaced by the body

Equal volume of water

Equal volume of liquid

⇒ Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is.

less than d

between d and 1.5 d

between 1.5 d and 2d

greater than 2d

⇒ Select the correct statement.

The absolute roughness of a pipe de-creases with time.

A pipe becomes smooth after using for long time.

The friction factor decreases with time.

The absolute roughness increases with time.

⇒ The relationship dp/dx = dz/dy is valid for

Irrotational flow

Non-uniform flow

Uniform flow

Unsteady flow

⇒ If a vessel containing liquid moves downward with a constant acceleration equal to 'g' then.

the pressure throughout the liquid mass is atmospheric

there will be vacuum in the liquid

the pressure in the liquid mass is greater than hydrostatic pressure

none of the above

⇒ Coefficient of velocity for Borda's mouth piece running full is

0.611

0.707

0.855

1.00

⇒ A hydrogen bal loon released on the moon would

Climb up with an acceleration of 9.8 m/sec

^{2}

Climb up with an acceleration of 9.8 x 6 m/sec

^{2}

Neither climb nor fall

Fall with an acceleration of 9.8/6 m/sec

^{2}

⇒ The valve provided in a suction pipe is called

Float valve

Gate valve

Foot valve

Two-way valve

⇒ The friction drag is more than pressure drag for

A sphere

A streamlined body

A circular disc placed normal to the flow direction

An air foil

⇒ Which of the following is an incorrect statement ?

Coefficient of contraction of a venturimeter is unity.

Flow nozzle is cheaper than venturimeter but has higher energy loss.

Discharge is independent of orientation of venturimeter whether it is horizontal, vertical or inclined.

None of the above statement is correct.

⇒ The wake.

always occurs before a separation point

always occurs after a separation point

is a region of high pressure intensity

none of the above

⇒ In a broad crested weir, width of crest of the weir will be

More than 0.5 H

Less than 0.5 H

Both (A) and (B)

None of the two

⇒ In steady flow of a fluid, the total accele ration of any fluid particle

can be zero

is never zero

is always zero

is independent of coordinates

⇒ Which of the following statements is correct?

Lower critical Reynolds number is of no practical significance in pipe flow problems.

Upper critical Reynolds number is significant in pipe flow problems.

Lower critical Reynolds number has the value 2000 in pipe flow

Upper critical Reynolds number is the number at which turbulent flow changes to laminar flow.

⇒ The total energy line lies over the hydraulic gradient line by an amount equal to

Velocity head

Pressure head

Friction head

Datum head

⇒ When a loaded boat enters into the sea from a river. it rises because

There is more water in sea than in river

Sea water is denser than river

There is difference of temperature

Sea is deeper than river

⇒ Specific speed of Francis turbine varies in between

10 to 35

10 to 50

60 to 400

300 to 1000

⇒ Across the boundary layer, pressure remains

More

Less

Constant

Zero

⇒ When Froude's number is more than 1, then the flow is termed as

Critical flow

Subcritical flow

Streaming flow

Shooting flow

⇒ A valve is suddenly closed in a water main in wl.ich the velocity is 1 m/sec and velocity of pressure wave is 981 m/ sec. The inertia head at the valve will be

1 m

10m

100m

none of the above

⇒ An open cubical tank of 2 m side is filled with water. If the tank is rotated with an acceleration such that half of the water spills out, then the acceleration is equal to

g/3

g/2

2g/3

g

⇒ Separation of flow occurs when.

the pressure intensity reaches a minimum

the cross-section of a channel is reduced

the boundary layer comes to rest

all of the above

⇒ The theoretical value of coefficient of contraction of a sharp edged orifice is

0.611

0.85

0.98

1.00

⇒ In case of an airfoil, the separation of flow occurs

at the extreme rear of body

at the extreme front of body

midway between rear and front of body

any where between rear and front of body depending upon Reynolds number

⇒ The Prartdtl mixing length is

zero at the pipe wall

maximum at the pipe wall

independent of shear stress

none of the above

⇒ Newton's law of viscosity relates

intensity of pressure and rate of angular deformation

shear stress and rate of angular deformation

shear stress, viscosity and temperature

viscosity and rate of angular deformation