Question # 1

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

When the upward drag force of the fluid becomes equal to downward force of gravity of the droplet, then its velocity:

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Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

Glycerin has viscosity _____ the viscosity of water:

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More than

Equal to

Less than

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 irregular and unsteady flow of the fluid is called

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turbulent flow

steady flow

either of them

both 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

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

The study of fluid in motion basically involves law of conservation of:

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Mass

Energy

Change

Both A and C

Both A and B

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

What are the SI base units of the coefficient of viscosity

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Kg m s^-2

kgm² s^-2

Kg m s^-1

kg m^-1s^-1

The product of cross-sectional area of the pipe and the fluid speed at any point along the pipe is called

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constant rate

volume rate

flow rate

steady rate

According to the equation of continuity, when water falls from the tap, it's speed increases and its cross-sectional area

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decreases

increases

becomes zero

none of them

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

The equation of continuity

A₁V₁= A₂V₂is for the flow of

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an ideal fluid

an incompressible fluid

a non visconcous fluid

all of the above

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

If one of the pipes has a much smaller diameter than the other and are placed horizontally then form both sides of Bernoulli's equation, we can drop the term

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P

1/2 fv²

pgh

none of them

The fluid is incompressible, if itsdensity is

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zero

constant

very high

very small

The value for systolic blood pressure for a normal healthy person is

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140 torr

80 torr

90 torr

120 torr

One torr is equal to

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13.33 N/m²

760 N/m²

760 mm Hg

133.3 N/m²

Bernoulli's equation is the fundamental equation in fluid dynamics, which relates pressure to fluid

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speed

height

none of them

both of them

During the steady flow, different streamlines

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cannot across each other

can across each other

either of them

neither of them

A high concentration of red blood cells increases its viscosity from

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3 - 5 times that of mercury

5 - 8 times that of mercury

3 - 5 times that of water

5 - 8 times that of water

A tube tapers from 20 cm diameter to 2 cm, the velocity at first cross-section is 50 ms^-1then velocity at second cross-section is

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5000 cms^-1

500 cms^-1

50 cms^-1

0.5 cm/s

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

Pressure exerted by a gas on the walls of its container in due to

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adhesion between the gas molecules and the container

cohesion between the gas molecules and the container

collision between the gas molecules and the container

surface tension of the gas

The internal pressure of the blood is

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less than the external atmospheric pressure

greater than the external atmospheric pressure

equal to the external atmosphericpressure

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

The dimensions of viscosity are:

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M²L^-1T^-2

M^-1L¹T^-1

M^-1L^-1T

ML^-1T^-1

Terminal velocity is the maximum velocity attained by a spherical droplet when the drag force______the weight of droplet:

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Is smaller than

Is greater than

Becomes equal to

None of these

Viscosity of water is ______ that of air but ___ that of plasma.

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More, more

Less, more

Less, less

More, less

Ball pen functions on the principle of

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Viscosity

Boyle's law

Gravitational force

Surface tnesion

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