Electricity and Magnetism Test

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Electricity and Magnetism Test - 5

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Weekly Quiz Competition

Question 1
1 / -0

Alnico is an alloy of

A
Iron, cobalt, nickel

B
Aluminum, cobalt, nickel

C
Magnesium, iron, Sulphur

D
Nickel, magnesium, cobalt

E
None of these

Solution

Alnico is an alloy of aluminium, cobalt & nickel
Question 2
1 / -0

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

A
North pole

B
South pole

C
Electric field

D
Magnetic field

E
None of these

Solution

The region around magnet where its effects can be felt is called its magnetic field
Question 3
1 / -0

Which of the following statements is not correct?

A
Each magnetic line of force starts from North pole and ends at South pole

B
Two magnetic lines of force intersect each other at North pole

C
Magnetic lines of force are closer when magnetic field is strong

D
Arrows show the direction in which magnetic field is acting

E
None of these

Solution

Two lines of force never intersect each other.
Question 4
1 / -0

According to the Right Hand Thumb Rule when the current flows downwards, then

A
Magnetic field acts anti-clockwise

B
Magnetic field acts clockwise

C
Magnetic field do not exist

D
There is no change in the direction of magnetic field

E
None of these

Solution

With downward flow of electric current, the magnetic field acts clockwise.
Question 5
1 / -0

According to the Right Hand Thumb Rule when the current flows downwards, then

A
Magnetic field acts clockwise

B
Magnetic filed acts anticlockwise

C
Magnetic filed remain same

D
The conductor breaks

E
None of these

Solution

With the upward flow of electric current, the magnetic field acts anti-clockwise.
Question 6
1 / -0

Which of the following is not correct about a Solenoid?

A
It looks like a spring

B
Its each turn carries the different current

C
It offers a uniform magnetic field

D
Pole get reversed if direction of current is reversed

E
None of these

Solution

In a solenoid, each turn carries the same amount of current & hence provides uniform magnetic field
Question 7
1 / -0

The strength of an electromagnet depends upon

A
Number of turns of coil per unit length

B
The strength of the current

C
The material forming its core

D
All of these

E
None of these

Solution

The strength of an electromagnet depends upon all of the mentioned factors (1), (2) and (3).
Question 8
1 / -0

When the magnetic flux linked with a circuit changes

A
The voltage remains constant

B
Current is induced in the circuit

C
The current increases gradually

D
All of these

E
None of these

Solution

When the magnetic flux linked with a circuit changes current is induced in the circuit. Moving a magnet near the coil changes the magnetic field at the coil which in turn changes the magnetic flux linked with the coil.
Question 9
1 / -0

Which of the following types of current is given by our mains supply?

A
Direct current

B
Zero current

C
Alternating current

D
All of these

E
None of these

Solution

Our mains supply gives an alternating current because, the motion of the coil keeps charging with every half rotation. AC is safer than DC
Question 10
1 / -0

Which of the following is of the correct order of input voltage that a main transformer receives?

A
110 V

B
220 V

C
132, 00 V

D
132, 000 V

E
1320 V

Solution

A mains transformer receives the voltage of the order of 132,000 V. This voltage is then stepped down to 220 V by the transformer and then supplied to the residential areas for residential use.
Question 11
1 / -0

AC is used in preference to DC for mains supply, which of the following is the principle reason for this?

A
Transmission of electrical power is easier

B
If is cheaper to generate AC than to generate DC

C
It is safer to use AC than to use DC

D
More appliances can be used on AC than a DC

E
None of these

Solution

AC is used in preference to DC for mains supply because It is safer to use AC than to use DC as well as it is easy to maintain and change the voltage of AC electricity for transmission and distribution.
Question 12
1 / -0

`An electric current creates a magnetic field around the conductor through which it flows`. Choose the correct option supporting this statement.

A
This is always true for small currents

B
This is true only for large currents

C
This is true only for slowly varying currents

D
This is true only for fast varying currents

E
All of these

Solution

No matter what kind of current it is, magnetic field will be created.
Question 13
1 / -0

On which of the following factors the strength of an electromagnet does not depend?

A
Orientation of the magnet

B
Number of turns

C
Material of the core

D
The current flowing through it

E
None of these

Solution

The strength of an electromagnet is independent of its orientation.
Question 14
1 / -0

The word `Alternating` in AC is used because the current

A
Always remains constant

B
Alternates between high & low values

C
Keeps reversing its direction

D
Can be switched ON and OFF alternately

E
None of these

Solution

AC is referred as `Alternating` current because it keeps on reversing its direction.
Question 15
1 / -0

Which of the following is true about an electromagnet?

A
Its magnetic strength depends upon the magnitude of electric current flowing through it

B
Once it gets magnetized, it does not loose its magnetic effect

C
Smaller the number of turns, stronger will be its magnetic strength

D
It is also called a natural magnet

E
The magnetic strength is independent of the length of the electromagnet

Solution

Electromagnet shows magnetic properties and behaves as a magnet when a varying current is allowed to flow through it.

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Electricity and Magnetism Test - 5

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Electricity and Magnetism Test - 5

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Question 1

Iron, cobalt, nickel

Aluminum, cobalt, nickel

Magnesium, iron, Sulphur

Nickel, magnesium, cobalt

None of these

Solution

Question 2

North pole

South pole

Electric field

Magnetic field

None of these

Solution

Question 3

Each magnetic line of force starts from North pole and ends at South pole

Two magnetic lines of force intersect each other at North pole

Magnetic lines of force are closer when magnetic field is strong

Arrows show the direction in which magnetic field is acting

None of these

Solution

Question 4

Magnetic field acts anti-clockwise

Magnetic field acts clockwise

Magnetic field do not exist

There is no change in the direction of magnetic field

None of these

Solution

Question 5

Magnetic field acts clockwise

Magnetic filed acts anticlockwise

Magnetic filed remain same

The conductor breaks

None of these

Solution

Question 6

It looks like a spring

Its each turn carries the different current

It offers a uniform magnetic field

Pole get reversed if direction of current is reversed

None of these

Solution

Question 7

Number of turns of coil per unit length

The strength of the current

The material forming its core

All of these

None of these

Solution

Question 8

The voltage remains constant

Current is induced in the circuit

The current increases gradually

All of these

None of these

Solution

Question 9

Direct current

Zero current

Alternating current

All of these

None of these

Solution

Question 10

110 V

220 V

132, 00 V

132, 000 V

1320 V

Solution

Question 11

Transmission of electrical power is easier