Sound Review - Chapter 2
This is a review about sound.
Questions and Answers
- 1.
Sound waves are caused by
- A.
Amplitude
- B.
Vibrations
- C.
A medium
Correct Answer
B. VibrationsExplanation
Sound waves are caused by vibrations. When an object vibrates, it creates disturbances in the surrounding medium, such as air or water. These disturbances travel in the form of waves, which we perceive as sound. The vibrations of an object cause the particles of the medium to vibrate, transferring energy from one particle to another and creating a chain reaction of vibrations. This propagation of vibrations through a medium is what ultimately leads to the generation of sound waves.Rate this question:
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- 2.
The sound of your voice is produced by the
- A.
Force of air making your vocal cords vibrate
- B.
Vibration of your middle ear
- C.
Vibration of air inside your lungs
Correct Answer
A. Force of air making your vocal cords vibrateExplanation
The correct answer is "force of air making your vocal cords vibrate". When we speak or produce sound, air from our lungs is pushed through the vocal cords in our voice box (larynx). The force of this air causes the vocal cords to vibrate, producing sound waves. These sound waves then travel through the throat, mouth, and nose, shaping the sound into words and tones. Therefore, the force of air is crucial in creating the vibrations of the vocal cords, which ultimately produce the sound of our voice.Rate this question:
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- 3.
Sound waves transfer energy by
- A.
Pushing and pulling air particles
- B.
Forcing the air out of a space
- C.
Moving air particles up and down
Correct Answer
A. Pushing and pulling air particlesExplanation
Sound waves transfer energy by pushing and pulling air particles. When a sound is produced, it creates vibrations that travel through the air. These vibrations cause the air particles to move back and forth in the same direction as the sound wave. As the particles are pushed together, they create areas of high pressure, known as compressions. When the particles are pulled apart, they create areas of low pressure, known as rarefactions. This alternating pattern of compressions and rarefactions is what allows sound waves to travel and transfer energy through the air.Rate this question:
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- 4.
Jim wants to make the pitch of a sound wave lower. He should
- A.
Decrease its wavelength
- B.
Increase its amplitude
- C.
Decrease its frequency
Correct Answer
C. Decrease its frequencyExplanation
To make the pitch of a sound wave lower, Jim needs to decrease its frequency. Pitch is directly related to the frequency of a sound wave. Higher frequencies result in higher pitch, while lower frequencies result in lower pitch. By decreasing the frequency, Jim will be able to achieve a lower pitch in the sound wave. Changing the wavelength or amplitude of the wave will not directly affect its pitch.Rate this question:
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- 5.
Nina listens to an ambulance as it travels past her. The sound of the siren
- A.
Decreases in pitch
- B.
Increases in wavelength
- C.
Decreases in amplitude
Correct Answer
A. Decreases in pitchExplanation
As the ambulance moves away from Nina, the sound waves it produces get stretched out, causing the pitch to decrease. This is known as the Doppler effect, where the frequency of a sound wave appears lower when the source is moving away from the listener. The wavelength of the sound waves also increases as they get stretched out, but the amplitude, which represents the volume or intensity of the sound, does not change in this scenario.Rate this question:
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- 6.
The intensity of a sound is determined by its
- A.
Amplitude
- B.
Frequency
- C.
Speed
Correct Answer
A. AmplitudeExplanation
The intensity of a sound is determined by its amplitude. Amplitude refers to the maximum displacement of a sound wave from its equilibrium position. The greater the amplitude, the louder the sound. This is because a larger amplitude means that the sound wave carries more energy, resulting in a higher intensity. Frequency, on the other hand, refers to the number of complete cycles of a sound wave that occur in one second, and it is related to the pitch of the sound. Speed, in the context of sound, refers to the rate at which the sound wave travels through a medium, but it does not directly determine the intensity of the sound.Rate this question:
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- 7.
Brian turns up the volume on his stereo. The stereo sends an electrical signal to the speakers. The signal changes the sound’s
- A.
Frequency
- B.
Wavelength
- C.
Intensity
Correct Answer
C. IntensityExplanation
When Brian turns up the volume on his stereo, the stereo sends an electrical signal to the speakers. This signal is responsible for changing the intensity of the sound produced by the speakers. Intensity refers to the amount of energy carried by sound waves, and increasing the volume on the stereo increases the intensity of the sound waves being produced. Therefore, in this context, intensity is the correct answer as it accurately describes the effect of turning up the volume on the stereo.Rate this question:
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- 8.
Your hearing can be damaged by
- A.
Low-frequency sounds
- B.
Long-wavelength sounds
- C.
High-intensity sounds
Correct Answer
C. High-intensity soundsExplanation
High-intensity sounds can cause damage to the delicate structures of the ear, including the hair cells in the inner ear. When exposed to loud sounds, these hair cells can become damaged or even die, leading to hearing loss. The intensity or volume of the sound is a crucial factor in determining its potential to cause harm. Low-frequency and long-wavelength sounds do not necessarily cause damage on their own unless they are also high in intensity.Rate this question:
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- 9.
A doctor uses ultrasound to
- A.
Test hearing
- B.
Examine internal organs
- C.
Locate objects in the dark
Correct Answer
B. Examine internal organsExplanation
Ultrasound is a medical imaging technique that uses high-frequency sound waves to create images of the internal organs of the body. It is commonly used by doctors to examine internal organs such as the liver, kidneys, heart, and reproductive organs. Ultrasound can provide valuable information about the structure, size, and function of these organs, helping doctors diagnose and monitor various medical conditions. It is a safe and non-invasive procedure that does not involve the use of radiation, making it a preferred choice for examining internal organs.Rate this question:
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- 10.
A CD player reads information from pits on the CD. This information is used to make sound waves. First, the CD player produces
- A.
Electrical signals
- B.
Vibrations
- C.
Grooves
Correct Answer
A. Electrical signalsExplanation
A CD player reads information from pits on the CD by using a laser to detect changes in the reflective surface. These changes are then converted into electrical signals. These electrical signals are then processed and amplified to produce sound waves that can be heard through speakers or headphones. The vibrations and grooves mentioned in the options are not directly involved in the process of reading information from the CD and producing sound waves.Rate this question:
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- 11.
A sound wave is produced by the
- A.
Vibration of an object
- B.
Transfer of energy through a vacuum
- C.
Movement of air in the lungs
Correct Answer
A. Vibration of an objectExplanation
Sound waves are created when an object vibrates. These vibrations cause the surrounding air particles to also vibrate, creating a disturbance that travels through the air as a sound wave. The vibrating object transfers its energy to the air particles, which then transmit the energy to our ears, allowing us to perceive sound. Therefore, the correct answer is "vibration of an object."Rate this question:
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- 12.
When you speak, the sound waves are produced by
- A.
The vibration of hairs in the cochlea
- B.
Air making your vocal cords vibrate
- C.
Electrical signals generated in your brain
Correct Answer
B. Air making your vocal cords vibrateExplanation
When you speak, the sound waves are produced by air making your vocal cords vibrate. The vocal cords are located in the larynx, also known as the voice box. When you exhale, air from your lungs passes through the vocal cords, causing them to vibrate. These vibrations then create sound waves that travel through the air and are heard as speech.Rate this question:
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- 13.
As a sound wave moves through the air, it creates
- A.
Only areas of compressed particles
- B.
Areas of high and low pressure
- C.
Vibrations in the inner ear
Correct Answer
B. Areas of high and low pressureExplanation
When a sound wave moves through the air, it creates areas of high and low pressure. This is because the sound wave consists of alternating compressions and rarefactions. During the compression phase, the air particles are pushed closer together, resulting in an area of high pressure. Conversely, during the rarefaction phase, the air particles spread out, leading to an area of low pressure. These areas of high and low pressure propagate through the air, allowing us to perceive sound.Rate this question:
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- 14.
In order to change the pitch of a sound, you should change its
- A.
Amplitude
- B.
Frequency
- C.
Intensity
Correct Answer
B. FrequencyExplanation
To change the pitch of a sound, you need to change its frequency. Pitch refers to how high or low a sound is perceived, and it is directly related to the frequency of the sound wave. Higher frequencies result in higher pitched sounds, while lower frequencies result in lower pitched sounds. Therefore, altering the frequency of a sound wave will change its pitch. Amplitude refers to the loudness or volume of a sound, while intensity refers to the strength or power of a sound. While changes in amplitude and intensity can affect the perception of a sound, they do not directly change its pitch.Rate this question:
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- 15.
The notes played on a flute and those played on a violin have the same pitch, but they sound very different. This is because their sounds have different
- A.
Wavelengths
- B.
Combinations of overtones
- C.
Natural frequencies
Correct Answer
B. Combinations of overtonesExplanation
The reason the notes played on a flute and those played on a violin sound different despite having the same pitch is because their sounds have different combinations of overtones. Overtones are additional frequencies that are produced along with the fundamental frequency of a sound. The unique combination of overtones in each instrument creates their distinct sound characteristics.Rate this question:
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- 16.
The intensity of a sound measures the
- A.
Frequency of the sound wave
- B.
Pitch of the sound
- C.
Amount of energy carried by the sound wave
Correct Answer
C. Amount of energy carried by the sound waveExplanation
The intensity of a sound refers to the amount of energy carried by the sound wave. It is a measure of how loud or soft a sound is perceived by the human ear. The greater the intensity, the louder the sound. This is because a higher intensity sound wave carries more energy and causes a greater disturbance in the medium through which it travels. Therefore, the correct answer is "amount of energy carried by the sound wave".Rate this question:
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- 17.
Tia uses a synthesizer to create sound waves. She increases the amplitude of the sound wave. What do you predict will happen to the sound?
- A.
The pitch will go up.
- B.
The loudness will increase.
- C.
The frequency will decrease.
Correct Answer
B. The loudness will increase.Explanation
When Tia increases the amplitude of the sound wave, it means that she is increasing the intensity or strength of the sound. This increase in amplitude will result in an increase in the loudness of the sound. The pitch, on the other hand, is determined by the frequency of the sound wave, which is not affected by changing the amplitude. Therefore, the correct prediction is that the loudness will increase.Rate this question:
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- 18.
An engineer places acoustic tiles on a ceiling. The tiles are designed to
- A.
Change the pitch of the sound waves
- B.
Absorb and redirect sound waves
- C.
Change the frequency of sound waves
Correct Answer
B. Absorb and redirect sound wavesExplanation
Acoustic tiles are designed to absorb and redirect sound waves. When sound waves hit the tiles, they are absorbed by the material, reducing echo and reverberation in the room. The tiles also redirect the sound waves in different directions, preventing them from bouncing directly back into the room. This helps to improve the acoustics of the space by reducing noise and creating a more balanced sound environment.Rate this question:
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- 19.
The part of a telephone that produces sound waves is the
- A.
Microphone
- B.
Diaphragm
- C.
Electrical signal
Correct Answer
B. DiapHragmExplanation
The diaphragm is the part of a telephone that produces sound waves. It is a thin, flexible material that vibrates when sound waves hit it. These vibrations are then converted into electrical signals, which are transmitted through the telephone line. The diaphragm plays a crucial role in capturing and converting sound into a format that can be transmitted over a telephone system.Rate this question:
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- 20.
Ultrasound echoes enable animals such as bats and dolphins to
- A.
Clean themselves
- B.
Remove obstacles in their paths
- C.
Locate food and avoid large objects
Correct Answer
C. Locate food and avoid large objectsExplanation
Ultrasound echoes allow animals like bats and dolphins to locate food and avoid large objects. Ultrasound is a type of sound wave with a frequency higher than what humans can hear. When emitted by these animals, the ultrasound waves bounce off objects in their environment and return as echoes. By analyzing the echoes, bats and dolphins can determine the location of food and identify potential obstacles or predators in their path, helping them navigate and survive in their surroundings.Rate this question:
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- 21.
Interpreting Visuals Using the picture below, answer the following question. There are three main types of musical instruments: stringed, wind, and percussion. The instrument in the picture is a cello. What type of instrument is it?
Correct Answer
stringedExplanation
The given picture shows a cello, which is a musical instrument that falls under the category of stringed instruments. Stringed instruments produce sound by vibrating strings that are stretched between two points. The cello has four strings that are played with a bow or plucked with fingers, making it a stringed instrument.Rate this question:
- 22.
What produces the sound in this instrument?
Correct Answer
The vibration of the strings
vibrating strings
vibration of the stringsExplanation
The correct answer is that the sound in this instrument is produced by the vibration of the strings. When the strings are plucked or struck, they vibrate, creating sound waves that travel through the air and reach our ears. This vibration is what produces the sound we hear from the instrument.Rate this question:
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Current Version
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Mar 22, 2023Quiz Edited by
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Feb 15, 2010Quiz Created by
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