Question # 1

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when:

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The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

The Phenomenon of generation of induced emf is called

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Electrostatic induction

Magnetic induction

Electromagnetic induction

Electric induction

Both A and B

Which of the following is most suitable as the core of transformer

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Soft iron

Alinco

Steel

None of these

Lenz's law is the consequence of

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Mass

Energy conservation

Momentum conservation

Charge

The induced current is a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both (A) and (B)

None of these

Split rings act as

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Vibrator

Resistor

Motor

Commulator

Instead of moving the coil towards a magnet, the magnet is moved towards the coil with the same speed. The galvanometer shows current

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Of same magnitude in the same direction

Of different magnitude in the same direction

Of same magnitude but in opposite direction

Of different magnitude in the opposite direction

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

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

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

In magnet-coil experiment, emf can be produced by

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving

Relative motion of the loop and magnet

Any one of above

All above

Faraday's law of electromagnetic induction has been used in the construction of:

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Galvanometer

Voltmeter

Electric motor

Electric genrator

Commutator

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The current produced by moving a loop of a wire across a magnetic field is called:

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Direct current

Magnetic current

Alternating current

Induced current

None of these

When a conductor is moved across a magnetic field, the redistribution of charge sets up:

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Magnetic field

Electrostatic field

Electromagnetic field

All of these

None of these

The law of electromagnetic induction is related to:

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Coulomb

Ampere

Faraday

Lenz

None of these

Micheal Faraday and joseph Henry belong respectively to:

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USA and England

England and France

England and USA

USA and France

None of these

A coil of constant area is placed in a constant magnetic field. An induced current is produced in the coil when

Choose an answer

The coil is distorted

The coil is rotated

The coil is neither distorted nor rotated

Both A and B

None of these

A metal road of length 1m is moving at a speed of 1 ms^-1In a direction making angle of 30º with 0.5 Y magnetic field. The emf produced in the rod is:

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0.25 N

0.25 V

2.5 V

2.5 N

25 V

Michael Faraday and Joseph Henry belong respectively to

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USA and England

England and France

England and USA

USA and France

None of these

Referring to above figure, a changing current in coil P can be produced:

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At the instant the switch is closed

At the instant the switch is opened

With the help of rheostat

All of these

None of these

The SI unit of magnetic induction is

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Weber

Weber/meter

Henry

Tesla

An emf is set up in a conductor when it:

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is kept in a magnetic field

is kept in a electric field

Move across a magnetic field

Both (A) and (B)

None of these

Referring to above figure, due to change in current in the coil P, the change in magnetic flux:

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Is associated with coil P

Is associated with coil S

Causes an induced current is coil S

All of these

None of these

The motional e.m.f depends upon the

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Length of a conductor

Strength of a magnet

Speed of the conductor

All of the above

Referring to above figure, current in the coil P grows from zero to its maximum value:

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At the instant the switch is closed

At the instant the switch is opened

When switch is kept open

All of above

Neither of above

The magnitude of induced emf depends upon the

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

The induced current in a conductor depends upon:

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Resistance of the loop

Speed with which the conductor moves

Any of these

Both A and B

None of these

In magnet-coil experiment, emf can be produced by:

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Keeping the coil stationary and moving the magnet

Keeping the magnet stationary and moving the coil

Relative motion of the loop and magnet

Any one of above

All above

The induced current in the loop can be increased by:

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Using a stronger magnetic field

Moving the loop faster

Replacing the loop by a coil of many turns

All above

Both (A) and (B)

The magnitude of induced emf depends upon the:

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Rate of decrease of magnetic field

Rate of change of magnetic field

Rate of increase of magnetic flux

Constancy of magnetic field

None of these

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ECAT Pre General Science Physics Chapter 15 Electromagnetic Induction Online Test MCQs With Answers

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