Question # 1

Bernoulli's equation is based upon law of conservation

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Mass

Momentum

Energy

None of these

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

Machine parts are jammed due to:

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Increasing in viscosity of lubricant

Decreasing in viscosity of lubricant

Decreasing in surface tension of lubricant

None of these

Fluid A is more viscous than fluid B. While flowing through a pipe of the same dimensions and material which fluid takes longer to travel at 25°C?

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fluid B

fluid A

both take the same time

not possible to determine from given information

The terminal velocity of water droplet of radius 1 x 10^-4m and desity 1000 kg m^-3descending through air of viscosity 19 x 10^-6kg. m^-1s^-1is

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2.5 ms^-1

3.2 ms^-1

4.3 ms^-1

1.1 ms^-1

At low speeds, the drag force is

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proportional to speed

inversely proportional to speed

not simply proportional to speed

none of them

The density of blood is nearly equal to that of

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mercury

sodium

water

honey

The law of conservation of mass gives us the

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equation of continuity

Bernoulli's theorem

both of them

none of them

Under normal circumstances, the volume of blood is sufficient to keep the vessels

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flatted for all times

inflated for all times

inflated for small times

none of them

0.10 cm can be written as:

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1.0 x 10^-2m

1.0 x 10^-3cm

1.0 x 10^-4cm

1. x 10^-4m

What is another name for laminar flow?

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streamline

unsteady flow

turbulent flow

both (a) and (b)

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

Blood is an

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Compressible fluid

incompressible fluid

hard

none of them

Bernoulli's equation is based upon law of conversation of

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mass

momentum

Energy

None

The un-steady streamline flow is called

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laminar flow

turbulent flow

both of them

none of them

Substances that do not flow easily have

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large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

When the different streamlines cannot cross each other, then this condition is known as

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continuity condition

turbulent flow condition

steady flow condition

none of them

The body will move with terminal velocity when it acquires

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minimum speed

zero speed

maximum speed

none of them

Fluids have three types of energies. The Bernoulli's equation combines those energies.which of the following is one of the three enrgies possessed by a fluid?

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potential energy

pressure energy

strain energy

(a) and (b) only

A person standing near the track of a fast moving train has tendency to fall towards it because of

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Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

The unit of viscosity is SI system is:

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Kg^-1m sec^-1

Kgm^-1 sec^-1

Kg^-1m^-1 sec

None of these

Surface tension of water is due to

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Inter molecular attractions

Inter molecular spaces

Inter molecular repulsion

None of above

Fire fighters have a jet attached to the head of their water pipes in order to head of their water pipes in order to

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Which of the following options correctly states the equation of continuity for an ideal fluid?

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A₁A₂= V₁V₂

A₁/A₂= V₂/V₁

A₁/A₂= V₁/V₂

none of the above

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

When a water droplet falling freely through air, the drag force on water droplet increases with th

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decrease in speed

increase in speed

pressure

none of them

The resistance offered by a fluid to a solid moving inside it is called:

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Drag force

Surface force

Viscosity

None of these

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

The direction of the streamlines is the same as the direction of the

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force

torque

velocity

weight

Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:

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Not affected due to its size

Twice that of small size ball

Four times that of small size ball

1/4th of that of small size ball

The force exerted by the fluid in a hydraulic pump on the piston is 10 cm², the fluid pressure on the piston is, in N/cm²

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20

200

2000

20,000

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