Electricity and Magnetism Test

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Electricity and Magnetism Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

When the magnetic flux linked with a circuit changes

A
an emf (or voltage) is induced in the circuit

B
an large amount of current starts flowing in the circuit

C
both (1) and (2)

D
none of these

Solution

option (1) is true as when magnetic flux linked with a circuit changes, an emf is induced in the circuit.
Question 2
1 / -0

What kind of energy conversion take place in electric motor?

A
Electric to Mechanical energy

B
Mechanical to electrical energy

C
Rotational to electrical energy

D
Mechanical to rotational energy

Solution

Electrical energy is converted into mechanical energy in case of an electric motor.

When an electric current passes through coil, the coil rotates. Thus, a device connected to the motor also rotates. Electric motors are used to drive fans washing machines, food processors.
Question 3
1 / -0

What kind of energy conversion takes place in case of generators?

A
electrical energy to mechanical energy

B
mechanical energy to electrical energy

C
electric energy to rotational energynone of these

D
none of these
Question 4
1 / -0

Power is transmitted at high voltage from one power station to another, why?

A
To reduce loss as heat in wires

B
To same time

C
Since resistance of wires is very large

D
Either (2) or (3)
Question 5
1 / -0

The flux linked with a circuit can be changed

A
By moving the coil

B
By moving the magnet

C
By moving the whole circuit

D
Either (1) or (2)

Solution

The flux linked with a circuit can be changed by either moving the magnet or coil. So 4^th option is correct answer.
Question 6
1 / -0

Which of the following is not correct regarding direct current?

A
Direct current is the current we get from cells.

B
Direction of such current is fixed.

C
Direct current flows from the negative terminal to the positive terminal of the cell.

D
All are correct

Solution

Option (3) is not correct as direct current flows from the positive terminal of the battery to negative terminal of the battery. So 3^rd option is the answer.
Question 7
1 / -0

The strength of magnetic field created by an electromagnet is independent of

A
The number of turns

B
Material at the core

C
Its direction

D
The current flowing through circuit

Solution

Strength of the magnetic field does not depend upon the direction of the electromagnet.
Question 8
1 / -0

A transformer is a device

A
which can increase the voltage

B
which can decrease the voltage

C
either (1) or (2)

D
both (1) and (2)

Solution

a transformer is a device which can increase or decrease the voltage. Therefore 3^rd option is the correct answer.
Question 9
1 / -0

A dynamo is small generator

A
which supplies alternating current

B
which supplies direct current

C
which is used to step up or step down voltage

D
which is used to step up or step down current

Solution

Option (2) is correct regarding a dynamo which is a small generator and can be used to supply direct current.
Question 10
1 / -0

Poles of a solenoid

A
get reversed if the direction of current is reversed

B
get reversed if large amount of current is passe

C
get reversed if large amount of voltage is applied

D
none of these

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Electricity and Magnetism Test - 2

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Electricity and Magnetism Test - 2

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Question 1

an emf (or voltage) is induced in the circuit

an large amount of current starts flowing in the circuit

both (1) and (2)

none of these

Solution

Question 2

Electric to Mechanical energy

Mechanical to electrical energy

Rotational to electrical energy

Mechanical to rotational energy

Solution

Question 3

electrical energy to mechanical energy

mechanical energy to electrical energy

electric energy to rotational energynone of these

none of these

Question 4

To reduce loss as heat in wires

To same time

Since resistance of wires is very large

Either (2) or (3)

Question 5

By moving the coil

By moving the magnet

By moving the whole circuit

Either (1) or (2)

Solution

Question 6

Direct current is the current we get from cells.

Direction of such current is fixed.

Direct current flows from the negative terminal to the positive terminal of the cell.

All are correct

Solution

Question 7

The number of turns

Material at the core

Its direction

The current flowing through circuit

Solution

Question 8

which can increase the voltage

which can decrease the voltage

either (1) or (2)

both (1) and (2)

Solution

Question 9

which supplies alternating current

which supplies direct current

which is used to step up or step down voltage

which is used to step up or step down current

Solution

Question 10

get reversed if the direction of current is reversed

get reversed if large amount of current is passe

get reversed if large amount of voltage is applied

none of these

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