Question # 1

The smooth or steady streamline flow is known as

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laminar flow

turbulent flow

both of them

none of them

The electrical forces between the molecules of a liquid are

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Repulsive

Attractive

Both A and B

None

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

Liquids and gasses have

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zero viscosity

non-zero viscosity

very large viscosity

very small viscosity

When a fluid is in motion, its flow can be considered as

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turbulent

streamline

either or them

neither of them

In deriving the Bernoulli's equation, we assume that the fluid is

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incompressible

no viscous

flows in a steady manner

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

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

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Quadratic equation

Equation of discontinuity

Equation of continuity

None of the above

The SI unit of viscosity is

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kg m^-1s^-1

kg ms^-1

kg m^-1s^-2

kg m^-1s

The dimensions of viscosity are:

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M²L^-1T^-2

M^-1L¹T^-1

M^-1L^-1T

ML^-1T^-1

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

The pressure will be low where the speed of the fluid is

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Zero

High

Low

Constant

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

Which of the following has the greatest coefficient of viscosity?

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water

gasoline

honey

tar

Substances that do not flow easily have

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large coefficient of viscosity

small coefficient of viscosity

either of them

none of them

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

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Increase the mass of water flowing per second

Avoid wastage of water

Increase the velocity of water flowing out

Increase the volume of water flowing per second

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

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

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Equal to weight of liquid displaced

Zero

Less than the weight of liquid displaced

Weight of body-weight of liquid displaced

The mass of fluid passing through any cross-section per unit time is called

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electric flux

magnetic flux

mass flux

none of them

Stock's law holds for:

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Motion through free space

Motion through viscous medium

Bodies of all shapes

None of these

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