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Q1. | A wooden cylinder floats vertically in water with half of its length immersed. The density of wood is |

A. | Equal to that of water [Wrong Answer] |

B. | Half the density of water [Correct Answer] |

C. | Double the density of water [Wrong Answer] |

D. | The question is incomplete [Wrong Answer] |

View Answer
Explanation:-
Answer : BDiscuss 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 :**

⇒ In a free vortex, velocity

Decreases with radius

Increase with radius

Is constant

None of these

⇒ The value of friction factor 'f' for smooth pipes for Reynolds number 106 is approximately equal to

0.1

0.01

0.001

0.0001

⇒ The generation of hydroelectric power as compared to power generated by coal, oil etc. is

Cheaper

Costlier

At par

Can not compare

⇒ For a sphere of radius 15 cm moving with a uniform velocity of 2 m/sec through a liquid of specific gravity 0.9 and dynamic viscosity 0.8 poise, the Reynolds number will be

300

337.5

600

675

⇒ The ratio between inertia force and viscous force is called

Reynold's number

Froude's number

Weber's number

Euler's number

⇒ It is easier to swim in sea water than in river water because

Sea is wider than the river

Sea is deeper than the river

Density of sea water is greater than that of river

Sea is having high waves all the time

⇒ The viscosity of a gas

decreases with increase in temperature

increases with increase in temperature

is independent of temperature

is independent of pressure for very high pressure intensities

⇒ Drag and lift forces actimg on an object placed is a fluid stream are caused by

Pressure and viscosity

Pressure and gravity

Pressure and turbulence

Viscosity and turbulence

⇒ Due to each end contraction, the discharge of rectangular sharp crested weir is reduced by

5%

10%

15%

20%

⇒ In which of the following the friction drag is generally larger than pressure drag?

a circular disc or plate held normal to flow

a sphere

a cylinder

an airfoil

⇒ As compared to flat plate force of jet on a semi-circular vane will be

Half

Equal

Double

Triple

⇒ Two pieces of metal when immersed in a liquid have equal upthrust on them, then

Both pieces must have equal weig.hts

Both pieces must have equal densities

Both pieces must have equal volumes

Both are floating to the same depth

⇒ If the dynamic viscosity of a fluid is 0.5 poise and specific gravity is 0.5, then the kinematic viscosity of that fluid in stokes is.

0.25

0.50

1.0

none of the above

⇒ The difference between the theoretical and actual velocities of the jet at vena contracta is mainly due to

Eddy currents

Velocity of approach

Friction

Boundary layers

⇒ 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

⇒ A floating body is said to be in a state of stable equilibrium.

when its metacentric height is zero

when the metacentre is above the centre of gravity

when the metacentre is below the centre of gravity

only when its centre of gravity is below its centre of buoyancy

⇒ 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 ship floats on water

It displaces no water

The weight of water displaced is equal to the weight of the ship

The weight of water displaced is lesser than the weight of the ship

The weight of water displaced is greater than the weight of the ship

⇒ The pitot tube is used to measure

velocity at stagnation point

stagnation pressure

static pressure

dynamic pressure

⇒ If velocity is zero over l/3rd of a cross-section and is uniform over remaining 2/3rd of the cross-section, then the correction factor for kinetic energy is.

4/3

3/2

9/4

27/8

⇒ 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

⇒ 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

⇒ Manometer is used to measure

Velocity of liquid

Atmospheric pressure

Pressure in pipe and channels

Pressure in venturimeter

⇒ 1 atm. pressure is equivalent to

1.315 kgf/cm

^{2}

1000 newton

760 mm Hg

14.7 pascal

⇒ Across the boundary layer, pressure remains

More

Less

Constant

Zero

⇒ Equation of continuity is based on the principle of conservation of

mass

energy

momentum

none of the above

⇒ Coefficient of discharge for a totally submerged orifice as compared to that for an orifice discharging free is

slightly less

slightly more

nearly half

equal

⇒ The sheet of water flowing through a notch or over a weir is known as

Nappe

Crest

Height of weir/notch

Sill

⇒ In a fluid flow the line of constant piezometric head passes through two points which have the same

Elevation

Pressure

Velocity

Velocity potential

⇒ Specific speed of Pelton-wheels having single jet, varies between

10 to 35

10 to 50

60 to 400

300 to 1000