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4

An open tank containing liquid is made to move from rest with a uniform acceleration. The angle 0 which the free surface of liquid makes with the horizontal is such that (where a = Horizontal acceleration of the tank, and g = Acceleration due to gravity)

A. tanθ = a/g

B. tanθ = 2 a/g

C. tanθ = a/2g

D. tanθ = a2/2g

Correct Answer :

A. tanθ = a/g


Related Questions

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4

The pressure of air __________ with the increase of height from the surface of the earth.

A. Does not change

B. Decreases

C. Increases

D. None of these

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4

When the flow in an open channel is gradually varied, the flow is said to be

A. Steady uniform flow

B. Steady non-uniform flow

C. Unsteady uniform flow

D. Unsteady non-uniform flow

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4

In a footstep bearing, if the speed of the shaft is doubled, then the torque required to overcome the viscous resistance will be

A. Double

B. Four times

C. Eight times

D. Sixteen times

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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 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

One stoke is equal to

A. 10-2 m2/s

B. 10-3 m2/s

C. 10-4 m2/s

D. 10-6 m2/s

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4

At the center line of a pipe flowing under pressure where the velocity gradient is zero, the shear stress will be

A. Minimum

B. Maximum

C. Zero

D. Could be any value

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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

An average value of coefficient of velocity is

A. 0.62

B. 0.76

C. 0.84

D. 0.97

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4

The shear stress between the two liquid layers is __________ proportional to the distance between two layers.

A. Directly

B. Inversely

C. Both A and B

D. None of these

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4

A hemispherical tank of radius (R) has an orifice of cross-sectional area (a) at its bottom and is full of liquid. The time required to empty the tank completely is

A. 14π R1/2/15Cd × a √(2g)

B. 14π R3/2/15Cd × a √(2g)

C. 14π R5/2/15Cd × a √(2g)

D. 14π R7/2/15Cd × a √(2g)

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4

The velocity corresponding to Reynold number of 2800, is called

A. Sub-sonic velocity

B. Super-sonic velocity

C. Lower critical velocity

D. Higher critical velocity

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4

If cohesion between molecules of a fluid is greater than adhesion between fluid and glass, then the free level of fluid in a dipped glass tube will be

A. Higher than the surface of liquid

B. The same as the surface of liquid

C. Lower than the surface of liquid

D. Unpredictable

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4

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

A. Circular

B. Square

C. Rectangular

D. Trapezoidal

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4

A flow through a long pipe at decreasing rate is called __________ uniform flow.

A. Steady

B. Unsteady

C. Both A and B

D. None of these

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4

The capillary rise at 20°C in a clean glass tube of 1 mm bore containing water is approximately

A. 5 mm

B. 10 mm

C. 20 mm

D. 30 mm

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4

A Piezometer tube is used only for measuring

A. Low pressure

B. High pressure

C. Moderate pressure

D. Vacuum pressure

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4

Choose the wrong statement

A. Fluids are capable of flowing

B. Fluids conform to the shape of the containing vessels

C. When in equilibrium, fluids cannot sustain tangential forces

D. When in equilibrium, fluids can sustain shear forces

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4

The buoyancy depends on

A. Mass of liquid displaced

B. Viscosity of the liquid

C. Pressure of the liquid displaced

D. Depth of immersion

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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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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

An ideal flow of any fluid must fulfil the following

A. Newton's law of motion

B. Newton's law of viscosity

C. Pascal' law

D. Continuity equation

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4

A glass tube of small diameter (d) is dipped in fluid. The height of rise or fall in the tube given by (where w = Specific weight of liquid, α = Angle of contact of the liquid surface, and σ = Surface tension)

A. 4wd/σ cosα

B. σ cosα/4wd

C. 4σ cosα/wd

D. wd/4σ cosα

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4

A flow is called hyper-sonic, if the Mach number is

A. Less than unity

B. Unity

C. Between 1 and 6

D. None of these

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4

A channel is said to be of most economical cross-section, if

A. It gives maximum discharge for a given cross-sectional area and bed slope

B. It has minimum wetted perimeter

C. It involves lesser excavation for the designed amount of discharge

D. All of the above

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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

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4

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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4

The discharge through an external mouthpiece is given by (where a = Cross-sectional area of the mouthpiece, and H = Height of liquid above the mouthpiece)

A. 0.855 a.√(2gH)

B. 1.855 aH.√(2g)

C. 1.585 a.√(2gH)

D. 5.85 aH.√(2g)

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4

Bulk modulus of a fluid is the ratio of

A. Shear stress to shear strain

B. Increase in volume to the viscosity of fluid

C. Increase in pressure to the volumetric strain

D. Critical velocity to the viscosity of fluid

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4

Choose the wrong statement

A. The horizontal component of the hydrostatic force on any surface is equal to the normal force on the vertical projection of the surface

B. The horizontal component acts through the center of pressure for the vertical projection

C. The vertical component of the hydrostatic force on any surface is equal to the weight of the volume of the liquid above the area

D. The vertical component passes through the center of pressure of the volume