The force of magnetism is stronger when magnets are ________________
cold
round
closer together
farther apart
6. Multiple Choice
2 minutes
1 pt
What would increase the strength of an electromagnet?
Increasing the amount of current flowing through the wire.
Inserting a wooden core inside the coil
Changing the direction of the current
Decreasing the number of coils of wire
7. Multiple Choice
2 minutes
1 pt
30 coils will hold 50 paperclips
Using more coils increases the strength of the electromagnet
15 coils hold twice as many paperclips as 10 coils
The more coils, the fewer paperclips the electromagnet will hold
8. Multiple Choice
2 minutes
1 pt
This is a magnet made by an electric current
temporary
permanent
electromagnet
ferromagnet
9. Multiple Choice
2 minutes
1 pt
The strongest part of a magnet is...
the bars.
the force field.
the poles.
the middle.
10. Multiple Choice
2 minutes
1 pt
What part of an atom is the most responsible for magnetism?
Proton
Neutron
Electron
11. Multiple Choice
3 minutes
1 pt
In an alternating current, the electrons flow back and forth and can travel long distances.
True
False
12. Multiple Choice
2 minutes
1 pt
In a direct current, electricity flows in one direction and cannot travel far.
True
False
13. Multiple Choice
2 minutes
1 pt
The greater the amount of loops you have....
The less voltage
The voltage stays the same
The greater the voltage
There is no change
14. Multiple Choice
3 minutes
1 pt
What did Faraday's experiments with magnets and electromagnetic induction demonstrate?
Strong electromagnets make electric current.
Electric current is made when the magnetic field changes.
Strong electric current makes electromagnets.
Magnetic fields are made when the electric field changes.
15. Multiple Choice
2 minutes
1 pt
If you wrap more coils around an electromagnet, it will become...
brighter
stronger
weaker
invisible
16. Multiple Choice
2 minutes
1 pt
Are ALL metals magnetic?
Yes
No
17. Multiple Choice
2 minutes
1 pt
Magnetic domains are
regions that may or may not be magnetized.
clusters of atoms randomly aligned
regions of atoms magnetically aligned
blocks of material
18. Multiple Choice
2 minutes
1 pt
Natural magnets, such as lodestones, display ferrimagnetism.
True
False
19. Multiple Choice
2 minutes
1 pt
It is possible for a magnet to have only one pole.
True
False
20. Multiple Choice
2 minutes
1 pt
The first practical use of natural magnets was navigation.
True
False
21. Multiple Choice
2 minutes
1 pt
What kind of magnet can be turned on and off?
refridgerator magnet
electromagnet
magnetite
iron
22. Multiple Choice
2 minutes
1 pt
Surrounding every magnet is a __________ __________.
magnetic field
electrical current
another magnet
23. Multiple Choice
2 minutes
1 pt
Magnets that are arranged like this will _______.
move away from each other (repel)
move towards each other (attract)
24. Multiple Choice
2 minutes
1 pt
These magnets will _______.
move away from each other (repel)
move toward each other (attract)
25. Multiple Choice
2 minutes
1 pt
Spinning electrons themselves are small magnets.
true
false
26. Multiple Choice
2 minutes
1 pt
This is an example of...
attraction
repulsion
27. Multiple Choice
2 minutes
1 pt
This is an example of magnets...
attracting to each other.
repelling each other.
28. Multiple Choice
2 minutes
1 pt
What can you make visible by sprinkling iron filings around a magnet?
the areas called domains
the magnetic field lines
the magnetic forces
the north and south poles
29. Multiple Choice
3 minutes
1 pt
Magnets attract to __________________.
iron
nickel
cobalt
all of the above
30. Multiple Choice
3 minutes
1 pt
True of False: Magnets attract to aluminum foil.
True
False
31. Multiple Choice
3 minutes
1 pt
A magnet can lose its magnetic properties if you ___________________
drop or hit the magnet
put the magnet in a strong magnetic field that is opposite of its own
heat up the magnet
all of the above
32. Multiple Choice
3 minutes
1 pt
There are several modern uses of magnets. A ________________________ can have million of magnets. Each magnet points in its own direction, making a code. This allows an individual to make purchases.
Driver's License
Check Book
Credit Card
TV
33. Multiple Choice
3 minutes
1 pt
There are several modern uses of magnets. ________________________ make electricity by spinning magnets around coils of wire. The magnetism makes an electric current in the wire.
ceiling fans
smoke detectors
flashlights
generators
34. Multiple Choice
3 minutes
1 pt
True or False: The Earth is a giant magnet
True
False
35. Multiple Choice
3 minutes
1 pt
This large crane magnet functions only when the electrical current is ON. The crane magnet is an example of what type of magnet?
NIB Magnet
Ceramic Magnet
Electromagnet
funnel magnet
36. Multiple Choice
2 minutes
1 pt
A tiny region ion a magnet where all the atoms are grouped together and their poles are aligned.
Domain
North
South
Commutator
37. Multiple Choice
2 minutes
1 pt
A magnet will attract scissors if the scissors contain:
copper
aluminum
gold
nickel
38. Multiple Choice
2 minutes
1 pt
Which type of rock is naturally magnetic?
granite
lodestone
limestone
sandstone
39. Multiple Choice
2 minutes
1 pt
Which of the following is a temporary magnet?
A refrigerator magnet
A nail you magnetized yourself
A magnetic rock
A compass
40. Multiple Choice
2 minutes
1 pt
Steven was turning a nail into a temporary magnet. He can make his temporary magnet stronger by _____.
attaching more paperclips
rubbing the nail with the magnet in one direction for fewer strokes
rubbing the nail with the magnet in one direction for more strokes
rubbing the nail with the magnet both directions
41. Multiple Choice
2 minutes
1 pt
How do you make an electromagnet?
wrap a battery in wire and connect it to an iron nail.
wrap a wire with another wire and connect it to an iron nail.
wrap an iron nail in wire and connect it to a power source.
wrap an iron nail in wire and connect it to another iron nail.