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Ch 10, 8th Grade
Test Description: Electromagnetic waves
Instructions: Answer all questions to get your test result.
1) Cell phones transmit and receive signals using
A
microwaves
B
radio waves
C
UV waves
D
gamma rays
2) Cell phones work only if they are in a ___ system.
A
cellular
B
GPS
C
hub
D
receiver
3) An electromagnetic wave consists of
A
AM and FM waves
B
electric and magnetic fields
C
particles of a medium
D
electrons and protons
4) An electromagnetic wave have fields that travel ___ to one another.
A
together
B
perpendicular
C
parallel
D
stacked on top of
5) Polarized light consists of waves that vibrate
A
in all directions
B
in only one direction
C
none of the above
D
parallel to each other
6) The only type of electromagnetic wave that you can see is
A
visible light
B
UV rays
C
gamma rays
D
radio waves
7) AM radio waves can travel farther than FM radio waves because
A
AM waves are faster than FM waves.
B
AM waves have constant amplitude.
C
AM waves produce better sound quality.
D
AM waves are reflected by Earth's ionosphere.
8) Which of the following is listed in order of increasing energy?
A
visible light, gamma rays, x rays
B
radio waves, visible light, x rays
C
x rays, visible light, radio waves
D
infrared rays, visible light, radio waves
9) The energy that electromagnetic waves transfer through matter or space is called
A
x rays
B
electromagnetic radiation
C
perpendicular radiation
D
thermal radiation
10) A packet of light energy is called a
A
photon
B
interneuron
C
neuron
D
photoelectric effect
11) Which is NOT an electromagnetic wave?
A
sound
B
visible light
C
x ray
D
gamma ray
12) Radar is used to
A
call people
B
see inside the body
C
detect objects and measure their distance and speed
D
pick up sound waves
13) An infrared camera takes pictures called
A
thermometers
B
thermographs
C
thermograms
D
thermopics
14) Visible light that appears ___ is actually a mixture of many colors
A
white
B
pink
C
purple
D
black
15) What kind of vitamin does UV rays cause cells to make?
A
K
B
C
C
A
D
D
16) Why does a dentist cover you with a lead apron to take Xrays of your teeth?
A
becuae they love to get the lead out
B
to get a better shot of the teeth
C
to black out everything else except the teeth
D
to protect you from xrays
17) The electromagnetic spectrum includes the complete range of electromagnetic waves placed in order of
A
increasing frequency
B
increasing amplitude
C
decreasing frequency
D
increasing wavelength
18) AM signals travel as
A
by changing the frequency of the wave
B
changes, or modulations, in the amplitude of the wave
C
changing all of the above
D
changing the wavelength of the wave
19) FM waves meet the ionosphere. What do they do?
A
they don't pass through the ionosphere
B
they pass through the ionosphere
20) Which is more expensive to operate?
A
a cell phone
B
a landline
C
walkie talkies
D
a satellite phone
*select an answer for all questions
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