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Q1. | Which of the following would a hydrogen balloon fincl easier to lift ? |

A. | 1 kg of water [Wrong Answer] |

B. | 1 kg of steel [Wrong Answer] |

C. | 1 kg of light packed feather [Correct Answer] |

D. | All the above [Wrong Answer] |

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Explanation:-
Answer : CDiscuss it below :!! OOPS Login [Click here] is required to post your answer/resultHelp other students, write article, leave your comments |

**Also Read Similar Questions Below :**

⇒ If the Froude's number of flow in an open channel is more than 1.0 then the flow is said to be

Critical

Shooting

Streaming

Transitional

⇒ The pressure at the summit of a syphon is

equal to atmospheric

less than atmospheric

more than atmospheric

none of the above

⇒ 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

⇒ The maximum thickness of boundary layer in a pipe of radius r is

0

r/2

r

2r

⇒ The hydraulic grade line is.

always above the centre line of pipe

never above the energy grade line

always sloping downward in the direction of flow

all of the above

⇒ The specific weight of water in S.I. units is

9.81 gm

981 gm

9.81 k N/m

^{3}

9.81 x 10

^{3}k N/m

^{2}

⇒ The valve provided in a suction pipe is called

Float valve

Gate valve

Foot valve

Two-way valve

⇒ 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.

⇒ If a sphere of diameter 1 cm falls in castor oil of kinematic viscosity 10 stokes, with a terminal velocity of 1.5 cm/sec, the coefficient of drag on the sphere is

less than 1

between 1 and 100

160

200

⇒ 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

⇒ Pressure at a point inside a liquid does not depend on

The depth of the point below the surface of the liquid

The nature of the liquid

The acceleration due to gravity at that point

The shape of the containing vessel

⇒ Coefficient of contraction for an external cylindrical mouthpiece is

1.00

0.855

0.7H

0.611

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

Critical flow

Subcritical flow

Streaming flow

Shooting flow

⇒ The Euler's equation for steady flow of an ideal fluid along a stream line is based on Newton's

First law of force

Second law of motion

Third law of momentum

Law of friction

⇒ When the depth of flow changes abruptly over a short distance, then the flow will be termed as

Rapidly varied flow

Unsteady flow

Gradually varied flow

Turbulent flow

⇒ The bodies which have definite separation points fixed by their shapes are known as

Stream lined bodies

Bluft bodies

Both (A) and (B)

None of the above

⇒ In a semi-circular vane, the maximum efficiency will be

0.50

0.592

0.667

0.817

⇒ With the same cross-sectional area and immersed in same turbulent flow, the largest total drag will be on

a circular disc of plate held normal to flow

a sphere

a cylinder

a streamlined body

⇒ 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

⇒ A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be.

less than 1 m/sec

1 m/sec

1.5 m/sec

2 m/sec

⇒ If in a satellite orbiting the earth, a cork is immersed in a jar of water and released, it will

Rise

Sink

Remain where left

None of the above

⇒ A wooden piece floats half submerged in a tub of water. If the system is transferred to a lift ascending, with acceleration the wooden piece will

Sink a little more

Rise a little

Remain half submerged

Will sink to the bottom

⇒ Which of the following velocity potentials satisfies continuity equation ?

x2y

x2-y2

cosx

x2 + y2

⇒ 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

⇒ A gale blows over a house. The force due to the gale on the roof is

Downward

Upward

Horizontal

Zero

⇒ For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is.

constant

dependent only on Reynolds number

a function of Reynolds number and relative roughness

dependent on relative roughness only

⇒ The power channel that extends from the intake works to the power house is called

Lead race

Head race

Diversion canal

Penstock

⇒ Stream lines and path lines always coincide in case of

steady flow

laminar flow

uniform flow

turbulent flow

⇒ Pelton-wheel is a

Tangential flow turbine

Radial flow turbine

Mixed flow turbine

Axial flow turbine

⇒ The total pressure on a plane surface inclined at an angle 9 with the horizontal is equal to.

PA

pA sin 9

pA cos 9

pA tan 9