Question # 1

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

The ratio of average e.m.f in the coil tot he time rate of change of current in the same coil is called

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Mutual induction

Mutual inductance

Capacitance

Self inductance

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

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1/4 times

4 times

Twice

1/2 of 8 cm diameter pipe

The motion of molecules in gases is:

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Orderly

Random

Circular

All of these

R.M.S velocity of a particle is V at pressure P. If pressure increases by two times, then R.M.S velocity becomes

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2V

3V

0.5V

V

The He-Ne laser discharge tube is filled with:

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85% He

15% He

50% He

60% He

85% Ne

Electric field lines emerge from the charges in

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One dimension

Two dimensions

Three dimensions

Four dimensions

None of these

If you are moving at relativistic speed between two points that are a fixed distance apart, then the distance between the two points appers

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larger

shorter

equal

none of these

The ratio of the diameter of two convex lenses is _____-the ratio of their focal lengths:

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Greater than

Less than

Equal to

None of these

Fluids resist force, This property is called

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Stiffness

Strength

Ductility

Elasticity

Inertia mass and gravitational mass are

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opposite

identical

identical when there is no friction

all of them

A science student takes 100 observations in an experiment Second time he takes 500 observations in the same experiment By doing so the possible error becomes

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5 times

1/5 times

Unchanged

None of these

The work done in taking a charge q once round a circle of radius r and having a charge Q at the centre is

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qQ/4πε_°r²

qQ/(4πε_°r)

qQ/[4πε_°](2πr)

Equal

The efficiency of carnot's engine can never be 1 or 100% unless cold reservoir is

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100 K

1 K°

0 K°

None of these

Electric potential of earth is takes to be zero because the earth is good

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Semiconductor

Conductor

Insulator

Dielectric

A convex lens of focal length 5 cm is used as magnifying glass Its magnifying power when the image is formed at infinity

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6

5

1.5

7

For average velocity of a body, it has

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Straight path

Curved path

Steady motion or variable

All of them

The conduction band in a solid

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may be empty

cannot be empty

should be filled

all of them

Examples of polymers are

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Polythene

Polystyrene

Nylon

All of them

An object moving with acceleration g is said to fall freely identify freely falling objects from the list given below

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An orange falling from a tree

A satellite orbiting around the earth

A football kicked in the air

All of these

If the values of instantaneous and average velocities are equal, the body is said to be moving with

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uniform acceleration

uniform speed

variables velocity

uniform velocity

The direction of velocity is along the direction of

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Motion

Displacement

Velocity

None of these

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