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4

When a body is placed over a liquid, it will float if

A. Gravitational force is equal to the up-thrust of the liquid

B. Gravitational force is less than the up-thrust of the liquid

C. Gravitational force is more than the up-thrust of the liquid

D. None of the above

Correct Answer :

B. Gravitational force is less than the up-thrust of the liquid


Related Questions

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4

The hammer blow in pipes occurs when

A. There is excessive leakage in the pipe

B. The pipe bursts under high pressure of fluid

C. The flow of fluid through the pipe is suddenly brought to rest by closing of the valve

D. The flow of fluid through the pipe is gradually brought to rest by closing of the valve

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4

An odd shaped body weighing 7.5 kg and occupying 0.01 m3 volume will be completely submerged in a fluid having specific gravity of

A. 1

B. 1.2

C. 0.8

D. 0.75

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The point in the immersed body through which the resultant pressure of the liquid may be taken to act is known as

A. Meta center

B. Center of pressure

C. Center of buoyancy

D. Center of gravity

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Surface tension has the units of

A. Newton-sec/m

B. Newton-m/sec

C. Newton/m

D. Newton

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The unit of surface tension is

A. N/m

B. N/m2

C. N/m3

D. N-m

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4

For hypersonic flow, the Mach number is

A. Unity

B. Greater than unity

C. Greater than 2

D. Greater than 4

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4

The factional resistance of a pipe varies approximately with __________ of the liquid.

A. Pressure

B. Velocity

C. Square of velocity

D. Cube of velocity

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4

Free surface of a liquid behaves like a sheet and tends to contract to smallest possible area due to the

A. Force of adhesion

B. Force of cohesion

C. Force of friction

D. Force of diffusion

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4

For measuring flow by a Venturimeter, if should be installed in

A. Vertical line

B. Horizontal line

C. Inclined line with flow downward

D. In any direction and in any location

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4

If the atmospheric pressure on the surface of an oil tank (sp. gr. 0.8) is 0.2 kg/cm, the pressure at a depth of 50 m below the oil surface will be

A. 2 meters of water column

B. 3 meters of water column

C. 5 meters of water column

D. 6 meters of water Column

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4

The conditions for the stable equilibrium of a floating body are

A. The metacentre should lie above the center of gravity

B. The center of buoyancy and the center of gravity must lie on the same vertical line

C. A righting couple should be formed

D. All the above are correct

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A fluid whose viscosity does not change with the rate of deformation or shear strain is known as

A. Real fluid

B. Ideal fluid

C. Newtonian fluid

D. Non-Newtonian fluid

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4

The mercury does not wet the glass. This is due to the property of the liquid known as

A. Cohesion

B. Adhesion

C. Viscosity

D. Surface tension

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4

The maximum discharge over a broad crested weir is

A. 0.384 Cd × L × H1/2

B. 0.384 Cd × L × H3/2

C. 1.71 Cd × L × H1/2

D. 1.71 Cd × L × H3/2

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4

A vertical wall is subjected to a pressure due to one kind of liquid, on one of its sides. Which of the following statement is correct?

A. The pressure on the wall at the liquid level is minimum

B. The pressure on the bottom of the wall is maximum

C. The pressure on the wall at the liquid level is zero, and on the bottom of the wall is maximum

D. The pressure on the bottom of the wall is zer

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Center of pressure on an inclined plane is

A. At the Centroid

B. Above the Centroid

C. Below the Centroid

D. At metacentre

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4

The value of mass density in kg-sec-V-m⁴ for water at 0°C is

A. 1

B. 1000

C. 100

D. 101.9

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4

The most efficient section of a channel is

A. Triangular

B. Rectangular

C. Square

D. Trapezoidal

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4

The increase of temperature results in

A. Increase in viscosity of gas

B. Increase in viscosity of liquid

C. Decrease in viscosity of gas

D. Decrease in viscosity of liquid

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4

Mach number is significant in

A. Supersonics, as with projectiles and jet propulsion

B. Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

C. Simultaneous motion through two fluids where there is a surface of discontinuity, gravity force, and wave making effects, as with ship's hulls

D. All of the above

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A venturi-flume is used to measure

A. Pressure of liquid

B. Discharge of liquid

C. Pressure difference between two points in a channel

D. Pressure difference between two points in a pipe

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The body will sink down if the force of buoyancy is __________ the weight of the liquid displaced.

A. Equal to

B. Less than

C. More than

D. None of these

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

A. Specific weight

B. Mass density

C. Specific gravity

D. None of these

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In the case of steady flow of a fluid, the acceleration of any fluid particle is

A. Constant

B. Variable

C. Zero

D. Zero under limiting conditions

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Liquids transmit pressure equally in all the directions. This is according to

A. Boyle's law

B. Archimedes principle

C. Pascal's law

D. Newton's formula

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4

Working principle of dead weight pressure gauge tester is based on

A. Pascal's law

B. Dalton's law of partial pressure

C. Newton's law of viscosity

D. Avogadro's hypothesis

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4

Whenever a plate is held immersed at some angle with the direction of flow of the liquid, it is subjected to some pressure. The component of this pressure, in the direction of flow of the liquid, is known as

A. Lift

B. Drag

C. Stagnation pressure

D. Bulk modulus

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The continuity equation is connected with

A. Open channel/pipe flow

B. Compressibility of fluids

C. Conservation of mass

D. Steady/unsteady flow

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The flow in which the velocity vector is identical in magnitude and direction at every point, for any given instant, is known as

A. One dimensional flow

B. Uniform flow

C. Steady flow

D. Turbulent flow

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A nozzle is generally made of

A. Cylindrical shape

B. Convergent shape

C. Divergent shape

D. Convergent-divergent shape