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4

For a body floating in a liquid the normal pressure exerted by the liquid acts at

A. Bottom surface of the body

B. C.G. of the body

C. Metacentre

D. All points on the surface of the body

Correct Answer :

D. All points on the surface of the body


Related Questions

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Property of a fluid by which its own molecules are attracted is called

A. Adhesion

B. Cohesion

C. Viscosity

D. Compressibility

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4

The length AB of a pipe ABC in which the liquid is flowing has diameter (d1) and is suddenly enlarged to diameter (d2) at B which is constant for the length BC. The loss of head due to sudden enlargement is

A. (v₁ - v₂)²/g

B. (v₁² - v₂²)/g

C. (v₁ - v₂)²/2g

D. (v₁² - v₂²)/2g

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4

The velocity corresponding to Reynold number of 2000 is called

A. Sub-sonic velocity

B. Super-sonic velocity

C. Lower critical velocity

D. Higher critical velocity

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4

A weir, generally, used as a spillway of a dam is

A. Narrow crested weir

B. Broad crested weir

C. Ogee weir

D. Submerged weir

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4

Euler's dimensionless number relates the following

A. Inertial force and gravity

B. Viscous force and inertial force

C. Viscous force and buoyancy force

D. Pressure force and inertial force

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4

When a body is immersed wholly or partially in a liquid, it is lifted up by a force equal to the weight of liquid displaced by the body. This statement is called

A. Pascal's law

B. Archimedess principle

C. Principle of floatation

D. Bernoulli's theorem

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4

A notch is used to measure __________ of liquids.

A. Pressure

B. Discharge

C. Velocity

D. Volume

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4

Reynold's number is the ratio of inertia force to

A. Pressure force

B. Elastic force

C. Gravity force

D. Viscous force

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4

When the Venturimeter is inclined, then for a given flow it will show __________ reading.

A. Same

B. More

C. Less

D. None of these

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4

Choose the correct relationship

A. Specific gravity = gravity × density

B. Dynamic viscosity = kinematic viscosity × density

C. Gravity = specific gravity × density

D. Kinematic viscosity = dynamic viscosity × density

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4

Which of the following instrument can be used for measuring speed of a submarine moving in deep sea?

A. Venturimeter

B. Orifice plate

C. Hot wire anemometer

D. Pitot tube

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4

The ratio of the inertia force to the __________ is called Euler's number.

A. Pressure force

B. Elastic force

C. Surface tension force

D. Viscous force

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4

A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal to

A. 10 kg

B. 100 kg

C. 1000 kg

D. 1 kg

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4

A balloon lifting in air follows the following principle

A. Law of gravitation

B. Archimedes principle

C. Principle of buoyancy

D. All of the above

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4

The volumetric change of the fluid caused by a resistance is known as

A. Volumetric strain

B. Volumetric index

C. Compressibility

D. Adhesion

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4

The bulk modulus of elasticity

A. Has the dimensions of 1/pressure

B. Increases with pressure

C. Is large when fluid is more compressible

D. Is independent of pressure and viscosity

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4

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

A. Reynold's number

B. Froude's number

C. Mach number

D. Euler's number

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4

The tendency of a liquid surface to contract is due to the following property

A. Cohesion

B. Adhesion

C. Viscosity

D. Surface tension

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4

The units of dynamic or absolute viscosity are

A. Metres² per sec

B. kg sec/meter

C. Newton-sec per meter

D. Newton-sec² per meter

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4

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

A. Velocity of approach

B. Lower critical velocity

C. Higher critical velocity

D. None of these

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4

In an immersed body, centre of pressure is

A. At the centre of gravity

B. Above the centre of gravity

C. Below be centre of gravity

D. Could be above or below e.g. depending on density of body and liquid

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4

When a vertical wall is subjected to pressures due to liquid on both sides, the resultant pressure is the __________ of the two pressures.

A. Sum

B. Difference

C. Arithmetic mean

D. Geometric mean

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4

For a floating body to be in equilibrium

A. Meta centre should be above e.g.

B. Centre of buoyancy and e.g. must lie on same vertical plane

C. A righting couple should be formed

D. All of the above

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4

The coefficient of discharge for an external mouthpiece depends upon

A. Velocity of liquid

B. Pressure of liquid

C. Area of mouthpiece

D. Length of mouthpiece

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4

The top of the weir over which the water flows is known as

A. Sill or crest

B. Nappe or vein

C. Orifice

D. None of these

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4

The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

A. μ π³ N² R² /1800 t

B. μ π³ N² R⁴ /1800 t

C. μ π³ N² R² /3600 t

D. μ π³ N² R⁴ /3600 t

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4

In order to increase sensitivity of U-tube manometer, one leg is usually inclined by angle θ. Sensitivity of inclined tube to sensitivity of Utube is equal to

A. Sinθ

B. 1/Sinθ

C. Cosθ

D. 1/Cosθ

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4

The center of gravity of the volume of the liquid displaced by an immersed body is called

A. Metacentre

B. Center of pressure

C. Center of buoyancy

D. Center of gravity

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4

The intensity of pressure on an immersed surface __________ with the increase in depth.

A. Does not change

B. Increases

C. Decreases

D. None of these

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4

A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

A. Length of both the pipes is same

B. Diameter of both the pipes is same

C. Loss of head and discharge of both the pipes is same

D. Loss of head and velocity of flow in both the pipes is same