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PS TEST 5: Magnetism S2

Total questions: 55

Worksheet time: 40mins

Name
Class
Date
1.

electric current that reverses its direction of flow in a regular pattern

a)

alternating current

b)

direct current

c)

electromagnetism

d)

magnetic domain

2.

electric current that flows in only one direction

a)

direct current

b)

alternating current

c)

generator

d)

magnetic field

3.

a device that converts electrical energy into mechanical energy by using the magnetic forces between an electromagnet and a permanent magnet to make a shaft rotate

a)

electric motor

b)

generator

c)

electromagnet

d)

galvanometer

4.

temporary magnet created when there is a current in the wire coil

a)

electromagnet

b)

electromagnetic foce

c)

magnetic field

d)

magnetic pole

5.

the attractive or repulsive force between electric charges and magnets

a)

electromagnetic force

b)

electromagnet

c)

solenoid

d)

magnetism

6.

process by which electric current is produced in a wire loop by a changing magnetic field

a)

electromagnetic induction

b)

magnetic field

c)

direct current

d)

alternating current

7.

interaction between electric charges and magnets

a)

electromagnetism

b)

electromagnetic force

c)

electromagnet

d)

electromagnetic induction

8.

device that uses an electromagnet to measure electric current

a)

galvanometer

b)

solenoid

c)

transformer

d)

turbine

9.

device that uses electromagnetic induction to convert mechanical energy into electrical energy

a)

generator

b)

transformer

c)

electric motor

d)

turbine

10.

region surrounding a magnet that exerts a force on other magnets and objects made of magnetic materials

a)

magnetic field

b)

magnetic domain

c)

magnetic pole

d)

magnetism

11.

region on a magnet where the magnetic force exerted by a magnet is strongest

a)

magnetic pole

b)

magnetic field

c)

magnetic domain

d)

electromagnetic force

12.

the properties and interactions of magnets

a)

magnetism

b)

electromagnet

c)

alternating current

d)

electromagnetism

13.
Magnetism is a type of ____________
a)
force
b)
book
c)
plant
d)
animal
14.
When two magnets attract, they ______________
a)
push apart
b)
change color
c)
get colder
d)
pull together
15.
When two magnets repel, they ________________
a)
change color
b)
pull together
c)
push apart
d)
get colder
16.
The force of magnetism can go through many materials.
a)
True
b)
False
17.
Two north poles will attract.
a)
True
b)
False
18.
What would we call a nail that can pick up a paperclip because it is touching a magnet?
a)
temporary magnet
b)
poles
c)
force
d)
detector
19.
True or False: All metals are attracted to magnet.
a)
True
b)
False
20.
Which two metals will be attracted by a magnet?
a)
iron and steel
b)
gold and silver
c)
aluminum and lead
d)
copper and cobalt
21.
These magnets will _______.
a)
move away from each other (repel)
b)
move toward each other (attract)
22.
The strongest part of a magnet is...
a)
the bars.
b)
the force field.
c)
the poles. 
d)
the middle.
23.
  You can make an electromagnet stronger by: having a __________________ current in the wire
a)
smaller
b)
larger
c)
greener
d)
water
24.
Why does a compass needle point north?
a)
The compass is a bar magnet
b)
Because north is up
c)
Because it's magic
d)
It lines up with the Earth's magnetic field
25.
This material is hard to magnetize, but STAYS magnetized
a)
temporary
b)
permanent
c)
ferromagnet
d)
electromagnet
26.
What part of an atom is the most responsible for magnetism?
a)
Proton
b)
Neutron
c)
Electron
27.
Iron, Nickel and cobalt are all __________________ materials
a)
Shiny
b)
poles
c)
magnetic
d)
cold
28.
This is a picture of a ________________ magnet.
a)
bar 
b)
circle 
c)
horseshoe
d)
paddle
29.
What do the lines around this magnet represent?
a)
North Pole
b)
South Pole
c)
Magnetic Declination
d)
Magnetic Field
30.
If the North Pole of a permanent magnet is placed next to a compass as seen in the picture, which direction will the needle move?
a)
Clockwise
b)
Counter-clockwise
c)
It will not move
d)
Need more information
31.
Electric motors are devices that convert _____ energy into  _____ energy.
a)
electrical; mechanical
b)
mechanical; electrical
c)
chemical; potential
d)
mechanical; kinetic
32.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
33.
2 ways to increase the magnetic force of an electro-magnet
a)
Increase the current flow, reduce the number of coils
b)
Increase the voltage, decrease the number of coils
c)
Increase the number of coils and the current flow
d)
Spread out the coils, replace iron core with rubber.
34.
What is responsible for the Magnetic Field around Earth?
a)
The Earth's crust
b)
The Earth's molton iron core
c)
The Earth's mantel
d)
The Sun
35.

Which of the following shows the correct shape of a bar magnet's magnetic field?

a)
b)
c)
36.

a mineral made magnetic by Earth's magnetic field

a)

natural magnet

b)

permanent magnet

c)

properties

d)

repel

e)

temporary magnet

37.
In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.
a)
Wind
b)
Water
c)
Magnets
d)
Circuits
38.
Generators are devices that convert _____ energy into _____ energy.
a)
chemical; mechanical
b)
mechanical; electrical
c)
electrical; mechanical
d)
potential; kinetic
39.
This picture is an example of a ___________
a)
Step- Up Transformer
b)
Step- Down Transformer
c)
Motor
d)
Generator
40.
Based on this picture, which side will have a higher voltage?
a)
Secondary
b)
Primary
c)
Both sides have the same voltage
d)
Cannot be determined
41.
Step-up transformers...
a)
improve the efficiency of the national grid
b)
reduce the voltage to a safe level for the home
c)
both 
42.
Step-down transformers...
a)
improve the efficiency of the national grid
b)
reduce the voltage to a safe level for the home
c)
both 
43.
As the distance between two magnets increases (they get farther apart), the force between them:
a)
Increases
b)
Decreases
c)
Stays the Same
44.
If you cut a magnet in half, what happens to the poles?
a)
One half gets the North Pole, the other half gets the South Pole
b)
Both halves get only a North Pole
c)
Both halves get only a South Pole
d)
Both halves get a North pole and a South Pole
45.

What type of transformer is used to increase the voltage from power stations.

a)

Step-down transformer

b)

Step-up transformer

46.

Why transformers work with A.C. current but not D.C.

a)

A.C current produces changing magnetic field.

b)

D.C current produces changing magnetic field.

c)

D.C current is weak

d)

A.C current is powerful

47.
This substance is
a)
magnetized
b)
unmagnetized
c)
positively charged
d)
negatively charged
48.
You know this substance is magnetized because
a)
all the domains have right angles
b)
the arrows are drawn in red
c)
the domains are aligned
d)
the domains are random
49.
Where are the magnetic force the strongest in this picture?
a)
Location 1
b)
Location 2
c)
Location 3
d)
Location 4
50.
How do magnets become weaker?
a)
use less of them 
b)
smaller ones are always weaker
c)
place them in different temperatures: hot vs cold
d)
it is based on cost
51.
Materials that can be turned into a magnet are called _____.  These include iron, nickel, cobalt, or mixtures of these materials.
a)
domains
b)
rocks
c)
ferromagnets
d)
solids
52.
In a magnet the ______________________ line up in the same direction.
a)
leaders
b)
domains
c)
nails
d)
wires
53.
The beautiful displays of light that can be seen at northern lattitudes related to the Earth’s magnetic field.
a)
Aurora Borealis
b)
Holiday lightrs
c)
flashlights
d)
fuses
54.
An electromagnet can be made stronger by 
a)
more power and an insulator
b)
more coils and more power
c)
a longer wire and more water
d)
a green wire and a switch
55.

Why does a compass needle point north?

a)

Because it is being attracted to the Magnetic South Pole

b)

Because north is up

c)

Because it is being attracted to the Magnetic North Pole

d)

Because north is down

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