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Magnet and electromagnetic wave

Total questions: 75

Worksheet time: 1hrs 1mins

Name
Class
Date
1.

What is the magnetic attraction or repulsion of a magnet called?

a)

the magnetic domain

b)

the magnetic field

c)

the magnetic pole

d)

the magnetic force

2.

Which type of magnet does not lose it's magnetic properties easily.

a)

a permanent magnet

b)

an electromagnet

c)

a temporary magnet

d)

a nail rubbed across the north pole of a magnet

3.

The space in which the magnetic effects exists is called

a)

the magnetic field

b)

the magnetic equator

c)

the magnetic material

4.

Paper clips and staples are attracted to magnets because paper clips and staples are

a)

permanent magnets

b)

temporary magnets

c)

magnetic materials

d)

magnetic domains

5.

What are the two magnetic forces?

a)

attraction

b)

equilibrium

c)

magnetic acceleration

d)

repulsion

6.
Magnetic field lines always cross.
a)
True
b)
False
7.

Are the magnetic field lines in the picture correct?

a)

Yes, because they point from north to south.

b)

No, because they point from north to south (they're supposed to go the other way).

c)

Yes, because the North pole is on the left in all pictures.

d)

No, because the North pole is on the left in all pictures (it's supposed to be on the right).

8.

Looking at the field lines in this picture, these two magnets are ________

a)

Attracting

b)

Repelling

c)

Attracting and Repelling

d)

Doing nothing

9.

What is the shape of a magnetic field around the Earth?

a)
b)
c)
d)
10.

What is the shape of a magnetic field around a wire?

a)
b)
c)
d)
11.
How are electromagnets different from magnets?
a)
magnets can be turned on/off
b)
you can turn an electromagnet on/off
c)
magnets are more powerful
d)
magnets have a North and South pole
12.

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.

a)

calculator

b)

ruler

c)

compass

d)

map

13.

Select the diagram with the weakest magnetic field

a)
b)
c)
14.

Where is the magnetic field the strongest around a bar magnet?

a)

far away from the magnet

b)

at the side of the magnet

c)

at the poles

d)

above the magnet

15.

Why does a compass needle point north?

a)

The compass is a bar magnet

b)

Because north is up and you know that up is always north or the stratosphere.

c)

Because it's magic

d)

Because the North end of the compass lines up with the Earth's magnetic south pole

16.
Magnetic force between two magnets gets weaker the more ________________ between them.
a)
distance
b)
attraction
c)
metal
d)
lightsabers
17.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
18.

The area of magnetic force around a magnet is known as its _____________.

a)

magnetic field

b)

magnetic declination

c)

magnetic fan lines

d)

magnetic tan lines

19.
Why are paper clips attracted to magnets?
a)
They contain silver.
b)
They contain aluminum
c)
They contain tin.
d)
They contain iron. 
20.
The picture is an example of an:
a)
Electric circuit
b)
Electromagnet
c)
Electric nail
d)
Electric power cell
21.
A compass needle responds to a magnetic field, because the compass needle is a
a)
A. generator.
b)
B. motor.   
c)
C. magnet.
d)
D. transformer.
22.

To pull objects toward each other

a)

Attract

b)

Repell

c)

Convert

d)

Energy

23.

As the magnets get farther apart, the strength of the fields get.....

a)

Weaker

b)

Stronger

c)

Stay the same

24.

Which statement is true about both magnetic and electric fields?

a)

Like charges repel each other

b)

Like charges attract each other

c)

Like poles attract each other

25.

A clumsy student drops a bar magnet and it breaks into this configuration. Afterwards, what is the result for the left and right magnets respectively?

a)

N-N on the left and S-S on the right

b)

N-S on the left and N-S on the right

c)

S-N on the left and S-N on the right

d)

S-S on the left and N-N on the right

26.

A magnet has a _______ pole and a _______ pole.

a)

north, south

b)

east, west

c)

positive, negative

d)

red, blue

27.

Which of the following would a magnet ATTRACT?

a)

A copper penny

b)

An iron nail

c)

A piece of glass

d)

A wood block

28.

All metals are magnetic.

a)

True

b)

False

29.

What is a difference between a magnet and a magnetic material?

a)

Magnets are metals and magnetic materials are not.

b)

Magnetic materials attract to either pole of a magnet; magnets only attract to opposite poles.

c)

Magnets are attracted to magnets and magnetic materials are repelled by magnets.

d)

Magnets and magnetic materials are the same thing.

30.

Why does the Earth have a magnetic field?

a)

Because of all the magnets on the Earth's surface

b)

Because the Earth is a magnet

c)

Because the Earth is made of copper

d)

Because Earth is orbiting around the sun

31.

These objects would...

a)

Attract

b)

Repel

c)

No reaction

32.

These objects would...

a)

Attract

b)

Repel

c)

No reaction

33.

These objects would...

a)

Attract

b)

Repel

c)

No reaction

34.

Magnetic force is strongest at...

a)

the north pole

b)

the south pole

c)

both poles

d)

the middle of the magnet

35.

In order to create these magnetic fields, what would the pole order have to be on the covered magnet?

a)

SN

b)

NS

c)

It could be either order.

d)

It is not a magnet - it has no poles.

36.

What does this picture represent?

a)

Magnetic forces between like poles

b)

Magnetic forces between opposite poles

c)

Magnetic forces between two metals

37.

The magnetic ____________ around a bar magnet is shown above.

a)

legs

b)

flowers

c)

field

d)

direction

38.

A compass points toward the south pole of Earth's magnetic field, located near the Earth's geographical ________.

a)

north

b)

south

c)

east

d)

west

39.

Every magnet has both a _________ pole and a __________ pole.

a)

North, South

b)

East, West

c)

Positive, Negative

d)

Positive, South

40.

Some objects that normally aren't magnetic can become magnetized when connected to a circuit. Items that are magnetized in this way are called ________.

a)

electromagnets

b)

electrons

c)

electrochromic devices

d)

permanent magnets

41.

Although magnetic fields are _____________, one common way that people investigate them is to use ________ filings.

a)

invisible, iron

b)

touchable, iron

c)

invisible, plastic

d)

touchable, plastic

42.

The image above shows how iron filings respond to magnetic fields generated by two magnets with ____________ poles facing each other.

a)

opposite

b)

like

c)

positive

d)

negative

43.
Which way will the magnets move after they are released?
a)
Towards each other
b)
Away from each other
c)
Not enough information
44.

A line that connects opposite magnetic poles and represents the strength and direction of the magnetic field

a)

Attract

b)

Convert

c)

Magnetic Field Line

d)

Magnetic Pole

45.

When you break a bar magnet into two pieces, you get _________________.

a)

two south poles

b)

a piece of iron that is no longer a magnet

c)

two north poles

d)

two north poles and two south poles

46.

If the wavelength of an electromagnetic wave is longer, what is true about the energy?

a)

Energy is higher.

b)

Energy is lower.

c)

Energy is not dependent on wavelength.

47.

Radiation from which region of the electromagnetic spectrum can be used to treat cancer?

a)

X-ray

b)

Radio

c)

Infrared

d)

Gamma

48.

Infrared radiation have a shorter wavelength than which waves

a)

Ultraviolet

b)

X-rays

c)

radio

d)

gamma rays

49.

Infra red radiation is used by

a)

MRI scanners

b)

Microwave ovens

c)

Remote Controls

d)

Tanning beds

50.

What is a property of all electromagnetic waves?

a)

They are longitudinal

b)

They are positively charged.

c)

They travel at the speed of sound.

d)

They travel through a vacuum.

51.

Radiation from which region of the electromagnetic spectrum is emitted from some radioactive nuclei

a)

Radio

b)

Gamma

c)

X-Ray

d)

Visible

52.

Select the correct order of waves on the Electromagnetic Spectrum from the longest wavelength to the shortest wavelength

a)

Radio, Microwaves, Infrared, Visible Light, Ultraviolet, X-ray, Gamma

b)

Gamma, X-ray, Ultraviolet, Visible Light, Infrared, Microwaves, Radio

c)

Visible Light, Microwaves, Infrared, Ultraviolet, X-ray, Gamma, Radio

d)

Microwaves, Gamma, Radio, Visible Light, Infrared, Ultraviolet, X-ray

53.
Put the visible light colors in order from longest wavelength to shortest wavelength
a)
Violet, Indigo, Blue, Green, Orange, Yellow, Red
b)
Red, Yellow, Green, Orange, Violet, Blue, Indigo
c)
Red, Orange, Yellow, Green, Blue, Indigo, Violet
54.

The picture below shows a scan of a nebula. There are two images. One image was created using visible light and the other using infrared light. Notice the two arrows point to two celestial objects in the infrared image. These two celestial objects are believed to be newly developed stars.


Which of the following reason are the two celestial objects visible only in the infrared image?

a)

The infrared image detects brighter objects.

b)

The visible light image detects brighter objects.

c)

The two celestial objects give off more infrared light than visible light.

d)

The two celestial objects give off more visible light than infrared light.

55.

Radiation from which region of the electromagnetic spectrum is used for mobile phone signals?

a)

Microwaves

b)

Gamma

c)

XRays

d)

Radio

56.

Sunblock can be applied to your skin to prevent damage from which electromagnetic waves?

a)

Infrared

b)

Microwaves

c)

Ultraviolet

d)

X Rays

57.

Which colour would you paint a surface to absorb the most infra red radiation?

a)

Black

b)

White

c)

Yellow

58.
What kind of waves do stars emit?
a)
x-ray and ultraviolet
b)
visibile
c)
radio and infrared
d)
all of the above
59.

To produce this image we need to use:

a)

X-Rays

b)

Gamma rays

c)

Infrared rays

d)

Ultraviolet

60.

Radiation from which two regions of the electromagnetic spectrum can be used in an optical fibre cable?

a)

Visble and Gamma

b)

Visible and microwaves

c)

Visible and infrared

d)

Visible and ultraviolet

61.

93.7MHz is equal to:

a)

937 Hz

b)

93 700 000 Hz

c)

93 700 Hz

d)

0.0937 Hz

62.

TWO uses of Microwaves are:

a)

to heat food

b)

in communication satellites

c)

to transmit a radio signal

d)

in fibre optics

63.

To communicate radio or tv waves over large distances we use:

a)

X-Rays

b)

Gamma Rays

c)

Radio Waves

d)

Infrared Rays

64.

Which of the following are uses for gamma radiation?

  1. Food preservation
  2. Sterilise surgical equipment
  3. Kill cancer cells
a)

1 and 2 only

b)

2 and 3 only

c)

1 and 3 only

d)

1, 2 and 3

65.
How are electromagnetic waves different from other waves? 
a)
They have very short wavelengths 
b)
They transmit energy instead of matter 
c)
They can travel through a vacuum 
d)
They can change direction by reflection 
66.
EM waves used in security scanning devices in airports
a)
ultraviolet
b)
x rays
c)
radio waves
d)
infrared
67.
EM waves that make an object feel warmer
a)
visible light
b)
red light
c)
infrared waves
d)
ultraviolet
68.

Sunglasses can be used to prevent eye damage from which region of the EM spectrum?

a)

Ultraviolet

b)

Visible

c)

X-ray

d)

Infra red

69.

MRI scanners make use of which region of the EM spectrum?

a)

Visible

b)

Radio

c)

Xray

d)

Gamma

70.

Accelerating electrons in an antenna generate radiation in which two regions of the EM spectrum?

a)

Radio

b)

Infrared

c)

Microwave

d)

Visible

71.

Infrared radiation is emitted by all objects. Which emits the most radiation

a)

Hot object painted black

b)

Cold object painted black

c)

Hot object painted white

72.

Radiation form which regions of the electromagnetic spectrum are emitted from (excited electrons in atoms)?

a)

Visible, UV and Gamma

b)

Visible, Radio and Microwave

c)

Visible, UV

d)

Visible and microwave

73.

Uses of UV radiation include

a)

Security markings on bank notes

b)

Washing powders

c)

Sterilisation of equipment

d)

Optical fibres

e)

Remote controls

74.

Which is. a hazard of overexposure to certain frequencies of microwave radiation

a)

Heating of cells

b)

Skin Cancer

c)

Snow blindness

75.

Select two precautions taken when you have an Xray.

a)

Limited exposure time

b)

Wearing of sunglasses

c)

Wearing of a lead apron

d)

Wearing of sunblock

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