Question # 1

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

A water hose with an internal diameter of 20 mm at the outlet discharges 30 kg of water in 60 s. What is water speed at the outlet if density of water is 1000 kg/m³during its steady flow

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1.3 m/s

1.6 m/s

1.9 m/s

2.2 m/s

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

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

When the velocity of a liquid flowing steadily in a tube increases, its pressure?

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Decreases

Increases

Remains same

Zero

When weight of an object falling freely becomes equal to the drag force, then the body will move with

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increasing speed

decreasing speed

constant speed

none of them

At the starting point of the free fall motion of an object, its acceleration will be

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maximum

minimum

zero

none of them

Bernoulli's equation is based upon law of conversation

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Mass

Momentum

Energy

None of these

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

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

The velocity gained by the fluid in falling through the distance (h_{1 - h}_{2) under the action of gravity is equal to the speed of the action of gravity is equal to the speed of the}

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orifices

efflux

fluid

none of them

Bernoulli's equation is applicable for

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turbulent flow

streamline flow

both (a) and (b)

all kinds of flows

During the free fall motion of an object, when its weight becomes equal to the drag force, then it will move with

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maximum speed

zero speed

maximum speed

none of them

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 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

The SI unit of viscosity is

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kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

The equation of continuity is

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A₁A_{2 = V}₁V₂

A_1/_V_{1 =}A_2/V₂

_V_1/A₁₌V_2/A₂

A₁_V_{1 =}A₂V₂

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

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 density of blood is nearly equal to that of

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mercury

sodium

water

honey

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

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

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 device used to measure the speed of liquid flow is known as

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barometer

speedometer

sphygmomanometer

venture-meter

With the increase of temperature viscosity

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Increase

Decrease

Remains same

Doubles

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

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

The rain drop falling from the sky reach the ground with

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Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

acceleration greater than g

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

Where the streamlines are very far apart from each other, the pressure will be

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low

zero

high

all of them

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