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4

A vessel of 4 m3 contains oil which weighs 30 kN. The specific weight of the oil is

A. 4.5 kN/m3

B. 6 kN/m3

C. 7.5 kN/m3

D. 10 kN/m3

Correct Answer :

C. 7.5 kN/m3


Related Questions

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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

Which of the following instrument can be used for measuring speed of an aeroplane?

A. Venturimeter

B. Orifice plate

C. Pitot tube

D. Rotameter

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4

The value of coefficient of discharge is __________ the value of coefficient of velocity.

A. Less than

B. Same as

C. More than

D. None of these

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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

A liquid compressed in cylinder has a volume of 0.04 m3 at 50 kg/cm² and a volume of 0.039 m3 at 150 kg/cm². The bulk modulus of elasticity of liquid is

A. 400 kg/cm²

B. 4000 kg/cm²

C. 40 × 10⁵ kg/cm²

D. 40 × 10⁶ kg/cm²

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4

All the terms of energy in Bernoulli's equation have dimension of

A. Energy

B. Work

C. Mass

D. Length

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4

The pressure of fluid due to hammer blow is

A. Directly proportional to density of fluid

B. Inversely proportional to density of fluid

C. Directly proportional to (density)1/2 of fluid

D. Inversely proportional to (density)1/2 of fluid

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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

The intensity of pressure at any point, in a liquid, is

A. Directly proportional to the area of the vessel containing liquid

B. Directly proportional to the depth of liquid from the surface

C. Directly proportional to the length of the vessel containing liquid

D. Inversely proportional to the depth of liquid from the surface

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4

The flow in a pipe is neither laminar nor turbulent when Reynold number is

A. Less than 2000

B. Between 2000 and 2800

C. More than 2800

D. None of these

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4

Bernoulli equation deals with the law of conservation of

A. Mass

B. Momentum

C. Energy

D. Work

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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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4

The shear stress-strain graph for a Newtonian fluid is a

A. Straight line

B. Parabolic curve

C. Hyperbolic curve

D. Elliptical

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4

Coefficient of contraction is the ratio of

A. Actual velocity of jet at vena contracta to the theoretical velocity

B. Loss of head in the orifice to the head of water available at the exit of the orifice

C. Loss of head in the orifice to the head of water available at the exit of the orifice

D. Area of jet at vena-contracta to the area of orifice

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4

The flow in which each liquid particle has a definite path and their paths do not cross each other is called

A. One dimensional flow

B. Streamline flow

C. Steady flow

D. Turbulent flow

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4

Resultant pressure of the liquid in the case of an immersed body acts through

A. Centre of gravity

B. Centre of pressure

C. Metacentre

D. Centre of buoyancy

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4

The theoretical velocity of jet at vena contracta is (where H = Head of water at vena contracta)

A. 2gH

B. H × √(2g)

C. 2g × √H

D. √(2gh)

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When the Mach number is between __________ the flow is called super-sonic flow.

A. 1 and 2.5

B. 2.5 and 4

C. 4 and 6

D. 1 and 6

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4

When a body floating in a liquid, is displaced slightly, it oscillates about

A. C.G. of body

B. Center of pressure

C. Center of buoyancy

D. Metacentre

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The highest efficiency is obtained with a channel of __________ section.

A. Circular

B. Square

C. Rectangular

D. Trapezoidal

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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

The point at which the resultant pressure on an immersed surface acts, is known as

A. Centre of gravity

B. Centre of depth

C. Centre of pressure

D. Centre of immersed surface

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4

When a cylindrical vessel of radius (r) containing liquid is revolved about its vertical axis ω rad/s, then depth of parabola which the liquid assumes is

A. ω.r/2g

B. ω².r²/2g

C. ω.r/4g

D. ω².r²/4g

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4

Non uniform flow occurs when

A. The direction and magnitude of the velocity at all points are identical

B. The velocity of successive fluid particles, at any point, is the same at successive periods of time

C. Velocity, depth, pressure, etc. change from point to point in the fluid flow.

D. The fluid particles move in plane or parallel planes and the streamline patterns are identical in each plane

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4

A vertically immersed surface is shown in the below figure. The distance of its centre of pressure from the water surface is

A. (bd²/12) + x

B. (d²/12 x) + x

C. b²/12 + x

D. d²/12 + x

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4

The Francis formula for the discharge over Cipoletti weir is

A. 1.84 LH1/2

B. 1.84 LH

C. 1.84 LH3/2

D. 1.84 LH5/2

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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

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4

The Reynold's number of a ship is __________ to its velocity and length.

A. Directly proportional

B. Inversely proportional

C. Square root of velocity

D. None of these

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4

In open channels, the specific energy is the

A. Total energy per unit discharge

B. Total energy measured with respect to the datum passing through the bottom of the channel

C. Total energy measured above the horizontal datum

D. Kinetic energy plotted above the free surface of water

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4

Euler's number is the ratio of __________ force to pressure force.

A. Inertia

B. Gravity

C. Viscous

D. None of these