Question # 1

Blood pressure is measured by the instrument

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stethoscope

sphygmomanometer

barometer

none of them

At high altitude the blood oozes out of the nose and ear because

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The blood pressure increase at high altitudes

The percentage of oxygen in the air increase

The atmospheric pressure decrease there

The density of blood decrease at high altitudes

The property of fluids due to which they resist their own flow is called:

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Drag force

Surface tension

Viscosity

None of these

Bernoulli's equation is based upon law of conversation of

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mass

momentum

Energy

None

When the speed of a body in a fluid increases then the drag force

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decreases

becomes zero

increases

non of them

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

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

A massive object falls through a fluid:

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Faster

Slower

Slowest

None

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

A fluid at a certain point has 50 J of potential energy per unit volume, 75 J of kinetic energy per unit volume,and 35 J of pressure energy per unit volume. the total energy of the fluid is

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125 J

90 J

160 J

85 J

In Bernoulli's theorem the relation between velocity and pressure is

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Inverse

Direct

None of the above

Both a and b

Drag force increases if speed of the object moving through the fluid:

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Increases

Decreases

Remains constant

None of these

The analysis of fluid motion becomes simplified by using

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law of conservation

law of conservation of energy

both of them

none of them

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

A container has a small hole in the bottom. Air can go through this hole,but water cannot. This can be best explained by the statement that

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water contains hydrogen atoms, air does not

water molecules are smaller than molecules in the air

surface tension of the water prevents it from

An object moving through a fluid experiences a retarding force called a

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frictional force

terminal force

opposing force

drag force

The fluid which is incompressible and non viscous is called

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Ideal fluid

Non-ideal fluid

Prefect fluid

All

When a water droplet falls through air, the net force on it is

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Net force = drag force - weight

Net force = weight - drag force

Net force = drag force + weight

Net force = weight + drag force

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

Bernoulli's equation is important in the field of

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Electrical circuit

Magnetism

Photoelectric effect

Flow of fluids

Above a certain velocity of a fluid is called

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turbulent flow

steady flow

either of them

both of them

When the droplet moves with terminal velocity in a fluid, the net force acting on the droplet is:

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F_D-mg

Zero

mg-F_D

None of these

According to Stoke's law, drag force depends on

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Initial velocity

Final velocity

Terminal velocity

Instantaneous velocity

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

If v is the velocity of flow of liquid through a tube of area of cross-section A, then according to equation of continuity

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v/A = constant

A/v = constant

Av = constant

None

Blood is an

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Compressible fluid

incompressible fluid

hard

none of them

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

Blood vessels can be stretch like rubber, therefore they are

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rigid

hard

very thick

not rigid

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

When there is no internal frictional forces between the adjacent layers of fluid, then the fluid is called

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incompressible

compressible

viscous

non viscous

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

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