WorksheetsY7. Magnets and Electromagnets - Pre-test Revision
Total questions: 59
Worksheet time: 1hrs 19mins
Magnets are attracted to some materials. We say these material are ____
Non-magnetics
Magnetic
Pattern
Magnet
Are all metals magnetic?
No, no metals are magnetic
yes, all metals are magnetic
No, only a few are magnetics like iron or steel
Which of these metals are attracted will be attracted by a magnet?
Silver and gold are attracted to magnets
False
True
A magnetic field is visible
True
False
Magnetism is a type of __________
Force
Book
Field
Animal
Are steel coins magnetic?
Yes
No
Maybe
Are screws magnetic?
Yes
No
Some of them
A magnet can attract any material contains...................
wood
plastic
iron
magnetic material is such as ..............
iron scissors
chair
plastic cup
Which of the two below result in an attractive force?
A positive charge and a negative charge
Two negative charges
Two south poles
A north pole and a south pole
Two postive charges
Two bar magnets are held close together. They are released and allowed to move freely. The bar magnets quickly come together. Which best explains why this happens?
The poles facing one another are both south poles
The poles facing one another are both north poles
The poles facing one another are opposite poles
One magnet was bigger than the other
Determine whether the following will attract or repel one another. Similar charges.
repel
attract
Match the key terms with their definitions.
Attract
to pull objects toward one another
Repel
to push objects away from each other
Magnetic field
the space around a magnet in which magnetic force can act on objects
Magnetic pole
one of the two opposite ends of a magnet
Magnetic field line
a line that connects opposite magnetic poles and represents the strength of the magnetic field
A ________ is a device that has a magnet on a needle that spins freely. It is used for navigation because its needle usually points north.
calculator
ruler
compass
map
Where is a magnetic field strongest?
at the poles of the magnet
in the middle of the magnet
it is equally strong everywhere in the field
none of the above
Which of the word pairs are synonyms (meaning the same)?
repel, pull
ends, poles
north, south
attract, push
Drop Down: This image represents this magnetic force, (a)
(a) is the space around a magnet in which magnetic forces can act on an object.
Which these materials are magnetic?
Cobalt, iron, steel, nickel
Aluminium, iron, steel, nickel
Iron, lithium, steel, nickel
Cobalt, magnesium, steel, nickel
What is the difference between a permanent magnet and an induced? (you can chose more than one option)
Permanent magnets do not produced their own magnetic field.
Permanent magnets produced their own magnetic field.
Induced magnets are always magnetic.
Induced magnets only turn into magnets with they are put into a magnetic field.
What happens to the magnetic field of an induced magnet when it is moved far away from a permanent magnet?
It gets greater.
It stops being produced.
In the given figure end A will acquire _______ pole and end B will acquire ______ pole.
south, north
north , south
south, south
north,north
Induced magnetism is ______
permanent
temporary
neither permanent or temporary
none of the above
This a picture of ....
induced magnets
permanent magnets
Maglev trains use magnets to float in the air. They do this by ...
Electrical resistance
gravity
magnetic repulsion
magnetic attraction
wind power
The paper clip is tied to a string. It appears to float. This because it is ...
attracted due to induction
repelled due to induction
This steel paper clip is in the magnetic field of the bar magnet. It is about to move.
Finish the sentence: The bar magnet is....
an induced magnet
a permanent magnet
an electromagnet
This picture shows an induced magnet. Which one is the induced magnet?
the nail
the bar magnet
The paper clip E is ...
an induced magnet
a permanent magnet
This steel paper clip is in the magnetic field of the bar magnet. It is about to move.
Finish the sentence: The paper clip will ....
always attract
always repel
either attract or repel - it could do either.
This steel paper clip is in the magnetic field of the bar magnet. It is about to move. Where will the north pole of the paperclip be?
Y
X
Z
W
There won't be a south pole
When the S and S of two different magnets come together they...
attract
repel
Magnetic Field lines point towards the (a) end of a magnet and away from the (b) end of the magnet.
Where a magnetic field is strong the lines are (a) . Where a magnetic field is weak the lines are (b) .
What is an electromagnet?
a magnet that becomes neutral due to electricity
a magnet created by electric current flowing through wires
a magnet that produces electricity
a electrical current that has magnets
Which of the following would have the weakest magnetic field?
Earth's magnetic field
a classroom permanent magnet
an electromagnet made of 20 coils of wire carrying 0.5 A around an iron core
Which of the following will increase the strength of an electromagnet?
changing the core to a permanent magnet
increasing the number of coils
changing the core to a soft magnet like iron
increasing the strength of the battery
What types of devices use electromagnets?
Junkyard Lifts
Motors
Electronics
Compass
Doorbell
Electromagnets are what type of magnet?
permanent
temporary
natural
A region, or space, where a force is acting.
Field
Lawn
Pool
Lake
'Like poles repel, unlike poles
attract’.
The law of thermodynamics
The law of physics
The law of magnetism
The law of attraction
Steel – a metallic material used in lots of places, e.g. construction of buildings and cars and in tools like hammers. It contains iron, which makes it magnetic.
Tungsten
Lead
Bronze
Steel
Very small pieces of iron, a metallic
element, which are normally longer than they are wide. This allows them to align themselves with the field lines around a magnet.
Iron fillings
Iron shards
Iron filings
Iron powder
What is the material seen around the magnet?
Iron Filings
Black sand
Copper
Titanium powder
Why does a compass needle, point towards the north?
The compass is a bar magnet.
North is up.
It deflects.
It lines up with the Earth's magnetic field.
Looking at the field lines in this picture, these two magnets are ________
Attracting
Repelling
Attracting and Repelling
Doing nothing
What is the shape of a magnetic field around the Earth?
Why does a compass needle point north?
The compass is a bar magnet
Because north is up and you know that up is always north or the stratosphere.
Because it's magic
Because the North end of the compass lines up with the Earth's magnetic south pole
