WorksheetsSound Class 9 NCERT
Total questions: 50
Worksheet time: 35mins
Name
Class
Date
1.
Sound moves in a _________.
a)
Transverse wave
b)
Longitudinal wave
2.
How is sound produced?
a)
By the vibration of particles
b)
By the transfer of particles
3.
Area of a longitudinal wave where particles are CLOSE together.
a)
Compression
b)
Rarefaction
4.
Area of a longitudinal wave where particles are APART.
a)
Compression
b)
Rarefaction
5.
Which device measures sound waves?
a)
Oscilloscope
b)
Stethoscope
c)
Radio
d)
I don't know
6.
The reflection of sound waves off of a hard surface can create ______.
a)
A wave
b)
An echo
7.
Soft surfaces _______ sound waves.
a)
Reflect
b)
Absorb
8.
___________ measures how close or far particles are.
a)
Amplitude
b)
Frequency
9.
________ describes how LOUD a sound is.
a)
Amplitude
b)
Frequency
10.
____________ is determined by sound wave's frequency.
a)
Compression
b)
Pitch
11.
_______ is the number of waves that pass a certain point at an specific time.
a)
Frequency
b)
Pitch
c)
Amplitude
d)
I don't know
12.
___________ affects how fast or slow sound waves travel.
a)
Temperature
b)
Speed
c)
Amplitude
d)
Frequency
13.
Sound waves travel farther through ________ media, like water or steel.
a)
Dense
b)
Light
14.
If you had to make some headphones to isolate sound, which material would you use?
a)
Soft, because they absorb sound.
b)
Hard, because they reflect sound.
15.
What type of energy does a sound wave have?
a)
Mechanical
b)
Radiant
c)
Electrical
d)
Sound
16.
Sound is produced by -----
a)
Heat energy
b)
Low temperatures
c)
Vibrations
d)
Friction
17.
True or False: Sound needs a medium.
a)
True
b)
False
18.
True or False: Sound waves are faster than light.
a)
False
b)
True
19.
Areas of increased pressure on a sound wave are known as a ----
a)
Rarefaction
b)
Compression
c)
Frequency
d)
Amplitude
20.
The distance from the beginning of one compression to the beginning of the next compression is called a -----
a)
Rarefaction
b)
Frequency
c)
Wavelength
d)
Compression
21.
Spread out areas or areas of decreased pressure on a sound wave are known as a ---
a)
Rarefaction
b)
Amplitude
c)
Compression
d)
Hertz
22.
The number of wavelengths that pass a fixed point each second is known as ----
a)
Hertz
b)
Amplitude
c)
Frequency
23.
The unit for measuring frequency is the ---
a)
Joule
b)
Hertz
c)
Gram
d)
Newton
24.
The measure of the amount of energy in a wave is ----
a)
Wavelength
b)
Hertz
c)
Frequency
d)
Amplitude
25.
The Tacoma Narrows Bridge, musical instruments, and crystal stemware are examples of -----
a)
Frequency
b)
Resonance
c)
Interference
d)
Speed
26.
The speed of sound depends on these two things:
a)
The type of medium and the temperature of the medium
b)
Speed of the medium and temperature of the medium
c)
Temperature of the medium and sound of the medium
d)
None of the above
27.
Sound waves travel the fastest through ---
a)
Liquids
b)
Gases
c)
Solids
28.
Sound waves that are beyond the range of human ear are known as ----
a)
Infrasonic waves
b)
Ultrasonic waves
29.
Sonar and echolocation use ----- to detect objects under water.
a)
Refraction
b)
Reflection
30.
Dan was sitting outside playing his new drum when his dog knocked some sand on it. Afterwards, each time Dan thumped the drum, he noticed the sand on top of the drum bounced. Which of the following is the best explanation for why this happened?
a)
Sand moves easily on drums.
b)
Dan was thumping the drum too hard.
c)
Vibrations moved from the drum to the sand.
d)
Vibrations moved from the sand to the drum.
31.
What is needed for a sound to be made?
a)
discrimination
b)
pitch
c)
vibration
d)
volume
32.
Jane and Sophie were playing a game in the pool. Jane would ask a question andthen both girls would go under the water where Sophie would say the answer. The girls observed that the sound was different under water. Why is the sound different?
a)
Sophie didn’t speak loudly enough.
b)
Sound doesn’t vibrate in the water.
c)
Ears don’t receive sound under water.
d)
Sound moves differently through the water than the air.
33.
Which of the following is the best description of pitch?
a)
how close or far the sound is
b)
how high or low the sound is
c)
how long or short the sound is
d)
how loud or soft the sound is
34.
Which of the following best describes volume?
a)
how close or far the sound is
b)
how high or low the sound is
c)
how long or short the sound is
d)
how loud or soft the sound is
35.
Which of the following would have the highest pitch?
a)
a lion roaring
b)
a man’s voice
c)
the rumble of a truck
d)
a bird chirping
36.
What is the biggest difference between someone yelling and whispering?
a)
the volume
b)
the pitch
37.
Which would have the loudest volume?
a)
a cricket chirping
b)
a dog barking
c)
rain falling
d)
thunder nearby
38.
Terrance was practicing on his drums one afternoon when his mom asked him to play them quieter. What should Terrance do?
a)
put a towel over the drums
b)
tap the drums softer
c)
tap the drums harder
d)
tighten the drums
39.
Megan was listening to her favorite song on the radio. She wanted to hear the song louder but she knew she shouldn’t turn the radio volume up. What could Megan do to hear the song louder?
a)
Close her eyes and focus on the music
b)
Move the radio closer to her
c)
Move the radio farther from her
d)
Tap on the radio
40.
Jaylen put a different amount of water into three different jars. He tapped each of the jars with a spoon and found that the jar with the least amount of water has the highest pitch. Jaylen added another jar, but left it empty. What would be the pitch of the empty jar when tapped with a spoon?
a)
The pitch would be lower than the other jars.
b)
The pitch would be higher than the other jars.
c)
The pitch would not change, but the volume of the sound would increase.
d)
The pitch would not change, but the volume of the sound would decrease.
41.
When tapped by a spoon, the jar with the most water has the lowest pitch of all three jars. What does this say about the vibrations of jar with the most water?
a)
all the jars vibrate the same
b)
the jar with the most water vibrates faster than the other jars
c)
the jar with the most water vibrates slower than the other jars
d)
none of the jars vibrate
42.
As more water is added to the jars, the sound created by tapping itwith a spoon has a lower pitch. What does this say about the volume?
a)
A lower pitch means the volume is softer.
b)
A lower pitch means the volume is louder.
c)
The volume does not change just because the pitch changes.
d)
There is no volume at all
43.
Sound cannot travel through which of the following?
a)
empty space
b)
gas
c)
liquid
d)
solid
44.
How can you make the pitch of a sound higher?
a)
Turn up the volume
b)
increase the vibration
c)
Shorten the string
d)
hit the string harder
45.
Which of the following will NOT change the pitch of a sound?
a)
the distance from the object
b)
the length of the object
c)
the thickness of the object
d)
the tension of the object
46.
You stand outside a room that has the doors and windows closed. Why can you still hear sounds made inside the room?
a)
Vibrations are absorbed in the doors and windows
b)
Vibrations are reflected inside the room
c)
Vibrations travel through the door and the window
d)
Vibrations echo in the room
47.
If you change the frequency or wavelength of a sound wave, you change the sound
a)
Vibration
b)
Pitch
c)
Volume
d)
Amplitude
48.
If you change the amplitude, or height of a sound wave, you change the sound
a)
Frequency
b)
Pitch
c)
Vibration
d)
Volume
49.
What does 1 represent?
a)
trough
b)
crest
c)
amplitude
d)
wavelength
50.
What does 2 represent?
a)
amplitude
b)
wavelength
c)
trough
d)
crest
100 %
