L1 - Magnetism Quiz

Question 1

State the difference between a temporary magnet and a permanent magnet

Answer 1

A temporary magnet is easily magnetized, but loses its magnetism when the magnetizing force is removed.

A permanent magnet is harder to magnetize, but retains most of its magnetism when the magnetizing force is removed.

Question 2

Name the material that is generally used for temporary magnets

Answer 2

Soft iron

Question 3

Name the material that is generally used for permanent magnets

Answer 3

Hard steel

Question 4

List three common magnetic materials

Answer 4

Nickel, manganese and colbalt

Question 5

Generally, it is said that when all magnetic domains of a substance are aligned, its magnetic strength is at its X.

Answer 5

Maximum

Question 6

Magnetic lines of force never X each other

Answer 6

Cross

Question 7

Magnetic lines of force always for X or circuits.

Answer 7

Complete loops

Question 8

Magnetic lines of force tend to be as X as X in length.

Answer 8

Short, possible

Question 9

If a magnet has a North pole, it must have a

Answer 9

South pole

Question 10

Magnetic lines of force tends to X each other.

Answer 10

Repel

Question 11

Magnetic lines of force will always set up in the path of least X

Answer 11

Reluctance

Question 12

Magnetic lines of force have a direction that indicate movement from X to X through a material such as air.

Answer 12

North, South

Question 13

Magnetic lines of force have a direction that indicate movement from X to X through a magnet.

Answer 13

South, North

Question 14

Magnetic lines of force tend to concentrate in a X material and spread out in a X -X material.

Answer 14

Ferromagnetic
Non-ferromagnetic

Question 15

Magnetic materials are known as X, which means they tend to act like X.

Answer 15

Ferromagnetic, magnets

Question 16

Magnetic fields of like polarity tend to X each others

Answer 16

Repel

Question 17

Magnetic fields of unlike polarity tend to X each other.

Answer 17

Attract

Question 18

Magnetic lines of force can create permanent or temporary magnets by

Answer 18

Induction

Question 19

Magnetic lines of force are also know as magnetic X or a magnetic X.

Answer 19

Flux, field

Question 20

Magnetic lines of force can pass through any X

Answer 20

Material

Question 21

The North pole of the Earth is actually a magnetic X

Answer 21

South pole

Question 22

A X is the only effective way to keep a designated area relatively free of magnetic lines of force.

Answer 22

Magnetic screen

Question 23

State the three ways can be used to effectively demagnetize a material

Answer 23

AC electric current, heating to Curie Temperature, vibrating of tapping.

Question 24

List three materials that are classified as ferromagnetic and explain what this term means.

Answer 24

Nickel, manganese, cobalt

Their magnetic domains can be easily aligned

Question 25

State the name of a naturally occurring permanent magnet.

Answer 25

Lodestone

Question 26

Which material will have more flux lines of flux when subjected to the same magnetizing force. A - Cast iron B- Cast steel C - Steel Sheet D- Copper

Answer 26

C - Sheet steel

Question 27

Which material will have more residual magnetism after being subjected to the same magnetizing force? A - Hard steel B- Soft iron C - Aluminium D - Copper

Answer 27

A- Hard steel

Question 28

Which material offers the least opposition (reluctance) to magnetic lines of force? A - Cast iron B- Cast steel C - Sheet steel D - Air

Answer 28

C - Sheet steel

Question 29

Which material offers the greatest opposition ( reluctance) to magnetic lines of force? A - Cast iron B- Cast steel C - Sheet steel D- Air

Answer 29

D - Air

Question 30

Which of the following materials is best for a magnetic screen? A - Hard steel B- Soft iron C - Copper D - Aluminium

Answer 30

B - Soft iron

Question 31

Which of the following best describes ‘magnetic flux’? A - A type of soldering compound B - Two electrons spinning in opposite directions C - Invisible lines of force D - An attraction between Aluminium and iron

Answer 31

C - Invisible lines of force

Question 32

What would the resistance of a material to conducting lines of flux be called? A - Permeability B- Retentivity C - Residual magnetism D - Reluctance

Answer 32

D - Reluctance