Question # 1

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

Two copper balls of 1 cm and 2 cm in diameter are simultaneously dropped in the same viscous medium. The terminal velocity of bigger ball is:

Choose an answer

Not affected due to its size

Twice that of small size ball

Four times that of small size ball

1/4th of that of small size ball

Fluid friction is _____ the friction between two solid surfaces:

Choose an answer

Greater than

Smaller than

Equal to

None of these

At high speed, fluid friction _____ and fuel consumption ___,:

Choose an answer

Increases, decreases

Increases, increases

Decreases, increases

None of these

Surface tension of water is reduced by adding

Choose an answer

Detergents

Camphor

Plastic

Both A and B

The SI unit of viscosity is

Choose an answer

kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

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

Choose an answer

Is smaller than

Is greater than

Becomes equal to

None of these

Fog droplets are suspended in air when their weight is balanced by:

Choose an answer

Force of gravity

Upward trust due to air

Surface tension

None of these

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

Choose an answer

Starts increasing

Starts decreasing

Becomes constant

Is called escape velocity

Two water pipes of diameters 4 cm and 8 cm are connected with a supply line. The velocity of flow of water in the pipe 4 cm diameter is

Choose an answer

1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

The rain drop falling from the sky reach the ground with

Choose an answer

Constant terminal velocity

Constant gravitational acceleration

Variable acceleration

acceleration greater than g

In a _____ flow, each particle of the fluid is called a streamline and different streamlines ______cross each other.

Choose an answer

Streamline, cannot

Turbulent, cannot

Streamline, can

None of these

Which of the following options states the names of fluids in the order of increasing viscosity?

Choose an answer

mercury, motor oil, methanol

methanol, mercury, motor oil

motor oil, mercury, methanol

methanol, motor oil, mercury

The electrical forces between the molecules of a liquid are

Choose an answer

Repulsive

Attractive

Both A and B

None

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

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

Choose an answer

More, more

Less, more

Less, less

More, less

More Classes

Other Links

ECAT 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