Question # 1

Blood pressure is measured in torr. Which of the following units could belong to torr?

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N m^-1

N m^-2

N m

N^-1m^-2

A tube is tapered from 20 cm diameter to 2 cm diameter, the velocity at the first cross-section is 50 cm/s, then the velocity at the second cross-section is

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50 m/s

20 m/s

40 cm/s

5 cm/s

Internal friction of fluid is called

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Surface tension

Viscosity

Resistance

Cohesive force

Blood has a density

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Equal to water

Greater then water

Lesser then water

None of these

The value of viscosity of a fluid is dependent on (at constant temperature)

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the fluid itself

the fluid and its container

anything in contact with the fluid

all of the above

The maximum drag force on a falling sphere is 9.8 N, it weight is

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1 N

9.8 N

4.9 N

Cannot be calculated

When each particle of the fluid moves along a smoth path, this path is known as

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straight path

smooth path

haphazard path

steamline

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

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

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Increase the mass of water flowing per second

Increase the velocity of water flowing out

Increase the volume of water flowing per second

Avoid wastage of water

N s m^-2is unit of:

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Drag force

Pressure

Surface tension

Coefficient of viscosity

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 smooth or steady stream-line flow is know as

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Laminar flow

Turbulent flow

Both a and b

None of the above

According to the Bernoulli's equation, where the speed of the fluid is high, the pressure will be

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low

zero

high

all of them

Unit of viscosity is:

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Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

If every particle of the flow that passes a particular point, moves along the same path as followed by particles which passed the point earlier, then this flow is said to be

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turbulent

streamline

abrupt

none of them

Where the streamlines are very close to each other, the pressure will be

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low

zero

high

all of them

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Physics ECAT Pre Engineering Chapter 6 Fluid Dynamics Online Test MCQs With Answers

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