Quiz Name: Ch.21 Sound 
Type: Multiple Choice 
Instructions: Write your answers on a separate sheet of paper. Check your answers by clicking on “answer key” below the last question.

Question 1: The unit for wave frequency is

decibel 
m/s 
meters 
hertz 

Question 2: Sound cannot travel through a

gas 
liquid 
vacuum 
solid 

Question 3: Sounds above 20,000 hertz are

ultrasonic 
infra sounds 
subsonic 
supersonic 

Question 4: Loud sounds have great

frequency 
wavelength 
pitch 
amplitude 

Question 5: A high pitch sound has a high

amplitude 
frequency 
crest 
wavelength 

Question 6: The unit for sound intensity or loudness is

hertz 
m/s 
meters 
decibel 

Question 7: A thick guitar string has a pitch that is

higher 
always soft 
lower 
ultrasonic 

Question 8: The amount of energy determines the

frequency 
amplitude 
wavelength 
pitch 

Question 9: The highness or lowness of sound is

pitch 
intensity 
wavelength 
amplitude 

Question 10: What is produced when sounds bounce off hard surfaces?

amplitude 
ultrasonic sound 
high pitch 
echo 

Question 11: A longer guitar string produces a

higher pitch 
the same pitch as shorter strings 
always louder sounds 
lower pitch 

Question 12: What is the affect of tightening a guitar string?

higher pitch 
lower pitch 
a louder sound 
no change in pitch 

Question 13: Which of the following can be used to study sound waves?

microscope 
oscilloscope 
voltmeter 
galvanometer 

Question 14: When a sound is made louder which of the following increases?

frequency 
pitch 
amplitude 
wavelength 

Question 15: Sound travels better through many

liquids 
gases 
travels the same in all materials 
solids 

Question 16: Sound waves are which of the following?

electrical signals 
magnetic fields 
form of radiation 
layers of compressed molecules 

Question 17: When a moving sound comes toward you the pitch seems to be

lower in pitch 
higher in pitch 
ultrasonic 
the same pitch 

Question 18: For sound to be produced there must be

electricity 
magnetism 
chemical reactions 
vibrations 

Question 19: What would be the difference between two sets of waves if one set had twice as many waves in a second as the other?

There would be a difference in frequency and pitch. 
There would be a difference in the amplitude and loudness. 
There would be a difference in the amplitude and pitch. 
There would be a difference in the frequency and loudness. 

Question 20: The distance from the crest of one wave to the crest of the next wave is called

amplitude 
crest 
frequency 
wavelength

Answer Key