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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
receiver
C
GPS
D
hub
3) An electromagnetic wave consists of
A
electric and magnetic fields
B
particles of a medium
C
electrons and protons
D
AM and FM waves
4) An electromagnetic wave have fields that travel ___ to one another.
A
together
B
stacked on top of
C
parallel
D
perpendicular
5) Polarized light consists of waves that vibrate
A
none of the above
B
parallel to each other
C
in all directions
D
in only one direction
6) The only type of electromagnetic wave that you can see is
A
radio waves
B
UV rays
C
gamma rays
D
visible light
7) AM radio waves can travel farther than FM radio waves because
A
AM waves produce better sound quality.
B
AM waves are faster than FM waves.
C
AM waves have constant amplitude.
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
infrared rays, visible light, radio waves
C
radio waves, visible light, x rays
D
x 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
photoelectric effect
B
photon
C
interneuron
D
neuron
11) Which is NOT an electromagnetic wave?
A
x ray
B
gamma ray
C
visible light
D
sound
12) Radar is used to
A
see inside the body
B
pick up sound waves
C
call people
D
detect objects and measure their distance and speed
13) An infrared camera takes pictures called
A
thermographs
B
thermograms
C
thermometers
D
thermopics
14) Visible light that appears ___ is actually a mixture of many colors
A
purple
B
white
C
pink
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 protect you from xrays
C
to get a better shot of the teeth
D
to black out everything else except the teeth
17) The electromagnetic spectrum includes the complete range of electromagnetic waves placed in order of
A
decreasing frequency
B
increasing amplitude
C
increasing frequency
D
increasing wavelength
18) AM signals travel as
A
changes, or modulations, in the amplitude of the wave
B
changing the wavelength of the wave
C
by changing the frequency of the wave
D
changing all of the above
19) FM waves meet the ionosphere. What do they do?
A
they pass through the ionosphere
B
they don't pass through the ionosphere
20) Which is more expensive to operate?
A
walkie talkies
B
a landline
C
a cell phone
D
a satellite phone
*select an answer for all questions
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