Question # 1

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

Choose an answer

Inverse

Direct

None of the above

Both a and b

Internal friction of fluid is called

Choose an answer

Surface tension

Viscosity

Resistance

Cohesive force

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

Choose an answer

straight path

smooth path

haphazard path

steamline

The un-steady streamline flow is called

Choose an answer

laminar flow

turbulent flow

both of them

none of them

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

Choose an answer

Decreases

Increases

Remains same

Zero

Unit of viscosity is:

Choose an answer

Kg m^-1sec^-1

N s m^-2

J s m^-3

All of these

According to the Bernoulli's theorem the pressure velocity are

Choose an answer

equal to each other

proportional to each other

inversely proportional to each other

none of them

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

Choose an answer

Drag force

Surface tension

Viscosity

None of these

The equation of continuity

A₁V₁= A₂V₂is for the flow of

Choose an answer

an ideal fluid

an incompressible fluid

a non visconcous fluid

all of the above

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

Choose an answer

A₁A₂= V₁V₂

A₁/A₂= V₂/V₁

A₁/A₂= V₁/V₂

none of the above

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

Choose an answer

Vibration due to motion of train

Gravitation force of attraction between person and trains

The high speed of train

Some other effect

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

Choose an answer

the fluid itself

the fluid and its container

anything in contact with the fluid

all of the above

Viscosity is defined as

Choose an answer

the friction between fluid and its container's walls

the internal friction between two layers of fluid

the resistance to flow a fluid experiences

the extent to which outside factors effect the fluid's flow

At low speeds, the drag force is

Choose an answer

proportional to speed

inversely proportional to speed

not simply proportional to 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

Choose an answer

P

1/2 fv²

pgh

none of them

The blood pressure of a person

Choose an answer

decrease with age

increase with age

has no effect with age

none of them

Machine parts are jammed due to:

Choose an answer

Increasing in viscosity of lubricant

Decreasing in viscosity of lubricant

Decreasing in surface tension of lubricant

None of these

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

Choose an answer

5000 cms^-1

500 cms^-1

50 cms^-1

0.5 cm/s

How much force is required to slide one layer of the liquid over the other layer is measured by

Choose an answer

friction

density

viscosity

resistivity

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

Choose an answer

N m^-1

N m^-2

N m

N^-1m^-2

According to slok's law, drag force depends on

Choose an answer

Radius of the spherical body

Terminal velocity of body

Coefficient of viscosity

All of above

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

Choose an answer

1.3 m/s

1.6 m/s

1.9 m/s

2.2 m/s

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?

Choose an answer

fluid B

fluid A

both take the same time

not possible to determine from given information

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

Choose an answer

Net force = drag force - weight

Net force = weight - drag force

Net force = drag force + weight

Net force = weight + drag force

Rate of flow can be expressed in

Choose an answer

litre/sec

litre-sec

sec/litre

sec/litre-m

In the case of an incompressible fluid in stead flow the net rate of flow of mass entering one end of the tube of flow is equal to the net rate of flow of mass leaving the other end. This equation is called

Choose an answer

Quadratic equation

Equation of discontinuity

Equation of continuity

None of the above

The body will move with terminal velocity when it acquires

Choose an answer

minimum speed

zero speed

maximum speed

none of them

In case of streamed lined flow of liquid, the loss of energy is

Choose an answer

Maximum

Minimum

Infinite

equal to what is in turbulent flow

During the steady flow, different streamlines

Choose an answer

cannot across each other

can across each other

either of them

neither of them

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

Choose an answer

decreases

increases

becomes zero

none of them

The SI unit of viscosity is

Choose an answer

kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

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}

Choose an answer

orifices

efflux

fluid

none of them

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

Choose an answer

force

torque

velocity

weight

A body is floating in a liquid. The up thrust on the body is

Choose an answer

Equal to weight of liquid displaced

Zero

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

The flow of an ideal fluid is

Choose an answer

streamline flow

incompressible flow

non-viscous

all of the above

More Classes

Other Links

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

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer

Choose an answer