Question # 1

High speed meteors rushing through air reduces to ashes because of:

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Force of gravity

High resistance of air

Drag force

None of these

The flow of an ideal fluid is

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streamline flow

incompressible flow

non-viscous

all of the above

Deep water almost runs still when surface water flow in rivers. What does it explains

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Magnus effect

Equation of continuity

Surface energy

Bernoulli's equation

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

Surface tension of water is reduced by adding

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Detergents

Camphor

Plastic

Both A and B

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

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Decreases

Increases

Remains same

Zero

Liquids and gasses have

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zero viscosity

non-zero viscosity

very large viscosity

very small viscosity

What is another name for laminar flow?

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streamline

unsteady flow

turbulent flow

both (a) and (b)

Matter is made up of very tiny particles called

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Atoms

Molecules

Ions

None of these

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

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Streamline, cannot

Turbulent, cannot

Streamline, can

None of these

The un-steady streamline flow is called

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laminar flow

turbulent flow

both of them

none of them

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

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force

torque

velocity

weight

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

Rate of flow can be expressed in

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litre/sec

litre-sec

sec/litre

sec/litre-m

Surface tension of water is due to

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Inter molecular attractions

Inter molecular spaces

Inter molecular repulsion

None of above

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