Electricity and Magnetism Test

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Electricity and Magnetism Test - 4

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Question 1
1 / -0

The statement incorrect regarding poles of magnet is

A
like poles repel each other while unlike poles attract each other.

B
a magnet has two poles where its electric properties are concentrated.

C
The north pole of a freely suspended magnet always points towards the north.

D
All the statements given are true

Solution

Option (1) and (3) are true while option (2) is incorrect as a magnet has two poles where its magnetic properties are concentrated. So 2^nd option is correct answer.
Question 2
1 / -0

An electromagnet is a coil

A
with a soft copper core

B
with a soft iron core

C
with a hard copper core

D
with a hard iron core

Solution

An electromagnet is a coil with a soft iron core. When a current flows through the coil, it acts as a magnet.
Question 3
1 / -0

The strength of an electromagnet depends upon the

A
Number of turns per unit length

B
The current flowing through electromagnet

C
The material at the core of the electromagnet

D
All of these

Solution

The strength of an electromagnet depends upon the number of turns per unit length, the current and material at its core.
Question 4
1 / -0

Which of the following is used to generate electricity in generators?

A
Electromagnetic conduction

B
Electromagnetic induction

C
Mutual induction

D
Magnetic induction

Solution

Electromagnetic induction is used to generate electricity in generators in which a coil is rotated in a magnetic field. The current this way produced keeps on changing direction and is called alternating current.
Question 5
1 / -0

What do you mean by solenoid?

A
A solenoid is a coil of wire some what like a spring.

B
A solenoid is a long wire used for transmitting signals.

C
A solenoid is a coil of wire made from copper, zinc and metal.

D
None of these

Solution

A solenoid is a coil with a soft iron core. When a current flows through the coil, it acts as a magnet.
Question 6
1 / -0

In which of the following, electromagnets are used?

A
To lift scrap iron

B
To separate irons from other materials

C
In relays, in MCB`s and electric bell

D
All of these

Solution

Electromagnet is used in all the given options. So 4th option is the correct answer.
Question 7
1 / -0

The statement incorrect regarding line of force is

A
each line of force starts from north pole, goes to south pole and continues from south pole to north pole

B
two poles of force do not interest

C
the lines of force lie away from each other where magnetic field is strong

D
all the given options are correct

Solution

Option 3^rd is not correct as the lines of force lie close to each other where the magnetic field is strong and are separated more widely where field is weak.
Question 8
1 / -0

The region around a magnet where its effects can be felt is

A
electric field

B
magnetic field

C
electric line of force

D
magnetic lines of force

Solution

2^nd option is the correct answer as region around a magnet where its effects can be felt is called magnetic field. Although we cannot see this field, we can represent it by a set of curves called magnetic lines of force.
Question 9
1 / -0

Magnetic field due to a ring acts

A
parallel to the plane of the ring

B
perpendicular to the plane of the ring

C
either (1) or (2)

D
neither (1) nor (2)

Solution

When current flows through a ring like conductor, the magnetic field created by it acts perpendicular to the plane of the ring. If the current flows clockwise the magnetic field will be directed into the ring.
Question 10
1 / -0

Which of the following is true regarding the difference between electromagnet and permanent magnet?

A
Magnetic properties of permanent magnet are fixed while that of electromagnet can change.

B
Poles of a permanent magnet are fixed but poles of an electromagnet depends upon the direction of current.

C
Both (1) and (2)

D
Neither (1) nor (2)

Solution

Option (1) and (2) both are corrects. So 3^rd option is the answer.
Question 11
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 12
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 13
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 14
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 15
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 16
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 17
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 18
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 19
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 20
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 passed

C
get reversed if large amount of voltage is applied

D
none of these

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Electricity and Magnetism Test - 4

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Question 1

like poles repel each other while unlike poles attract each other.

a magnet has two poles where its electric properties are concentrated.

The north pole of a freely suspended magnet always points towards the north.

All the statements given are true

Solution

Question 2

with a soft copper core

with a soft iron core

with a hard copper core

with a hard iron core

Solution

Question 3

Number of turns per unit length

The current flowing through electromagnet

The material at the core of the electromagnet

All of these

Solution

Question 4

Electromagnetic conduction

Electromagnetic induction

Mutual induction

Magnetic induction

Solution

Question 5

A solenoid is a coil of wire some what like a spring.

A solenoid is a long wire used for transmitting signals.

A solenoid is a coil of wire made from copper, zinc and metal.

None of these

Solution

Question 6

To lift scrap iron

To separate irons from other materials

In relays, in MCB`s and electric bell

All of these

Solution

Question 7

each line of force starts from north pole, goes to south pole and continues from south pole to north pole

two poles of force do not interest

the lines of force lie away from each other where magnetic field is strong

all the given options are correct

Solution

Question 8

electric field

magnetic field

electric line of force

magnetic lines of force

Solution

Question 9

parallel to the plane of the ring

perpendicular to the plane of the ring

either (1) or (2)

neither (1) nor (2)

Solution

Question 10

Magnetic properties of permanent magnet are fixed while that of electromagnet can change.

Poles of a permanent magnet are fixed but poles of an electromagnet depends upon the direction of current.

Both (1) and (2)

Neither (1) nor (2)

Solution

Question 11

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 12

Electric to Mechanical energy

Mechanical to electrical energy

Rotational to electrical energy

Mechanical to rotational energy

Solution