Sound Worksheet

Objective Type Questions

1. Match the following:
   
   
   
2. Match the following:
   
   
   
3. State whether the statement is true or false:
   The lower the frequency of vibration, the higher is the pitch.
   
   
4. Fill in the blanks:
   (a) The property of sound that animals use to find their way and locate their food is______________.
   (b) ______________ is the instrument used in the laboratory to produce the sound of a fixed frequency.
   (c) The number of vibrations completed in one second is known as _______________.
   (d) Sound absorbing materials are required in auditorium to avoid _______________.
   
   
5. Unscramble the following words:
   (a) NATIOCIOSLL
   (b) NELODUSS
   (c) CFRYEQNUE
   
   Multiple Choice Questions
   
   
6. Amit is an engineer who is designing a new communication device. He needs to know in which mediums the device will be unable to transmit sound. 
   He has four options: Wood, Water, Air, and Vacuum.
   Can you help Amit by selecting the correct mediums for his device?
   (a) Wood and Water
   (b) Wood, Water, and Air
   (c) Only Vacuum
   (d) Water, Air, and Vacuum 
   
   
7. 1 Hz = _________.
   (a) One vibration per minute
   (b) 1000 vibrations per minute
   (c) 60 vibrations per minute
   (d) 100 vibrations per minute
   
   
8. Arun is a marine biologist studying the communication patterns of dolphins. He wants to analyze the sounds produced by dolphins and determine their frequency range. Which frequency range should he focus on to capture and analyze the dolphin's communication sounds?
   (a) between 20 and 20000 Hz
   (b) above 20000 Hz
   (c) below 20 Hz
   (d) between 500 and 10000 Hz
   
   
9. Which of the following is a potential solution to mitigate the harmful effects of noise pollution in a residential area?
   (a) Increase the volume of televisions and music systems.
   (b) Set up noise-producing industries near residential areas.
   (c) Remove trees and other natural barriers to sound.
   (d) Build factory far away from residential areas.
   
   
10. In order to reduce the loudness of a sound, we have to
    (a) decrease its amplitude of vibration of the sound.
    (b) decrease its frequency of vibration of the sound.
    (c) increase its frequency of vibration of the sound.
    (d) increase its amplitude of vibration of the sound.
    
    Subjective Questions
    
    
11. Why can we hear the sound of a clock clearer at night than during the day?
    
    
12. How do loudness and pitch of sound depend on amplitude and frequency, respectively?
    
    
13. Why does a vibrating simple pendulum not produce any sound?
    
    
14. What do you mean by musical sound and noise? Give two examples of each. Also, represent musical sound and noise graphically.
    
    
15. State the difference between infrasonic, sonic and ultrasonic sound.
    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
    
16. Assertion: The shape of the outer part of the ear is like a funnel.
    Reason: The eardrum is like a stretched rubber sheet.
    
    
17. Assertion:  The eardrum is not essential for hearing.
    Reason:  The eardrum sends vibrations to the inner ear.
    
    
18. Assertion:  Sound can travel through water.
    Reason: Sound requires a medium for propagation. 
    
    
19. Assertion: In humans, the sound is produced by the larynx.
    Reason: The vocal cords within the larynx vibrate to produce sound waves.
    
    Case-Based Questions
    
    
20. During science class, Ravi’s teacher explained that the audible range of sound for humans is between 20 Hz and 20,000 Hz. This means that sounds with frequencies below 20 Hz or above 20,000 Hz cannot be heard by humans. Ravi was curious and decided to experiment at home. He used a frequency generator app on his brother’s phone and played sounds with different frequencies. He found that he could not hear sounds with frequencies below 20 Hz or above 20,000 Hz.
    Answer the following question based on the given information.
    (a) What is the audible range of sound for humans?
    (b) Why can’t Ravi hear sounds with frequencies below 20 Hz or above 20,000 Hz?
    (c) How does the frequency of a sound affect its pitch?
    (d) State the difference between high-pitch sound and low-pitch sound.

Objective Type Questions

1. Match the following:
   
   Solution:
   Correct answer: I-B, II-C, III-D, IV-A
   
   
   
2. Match the following:
   
   Solution:
   Correct answer: I-C, II-D, III-B, IV-A
   
   
   
3. State whether the statement is true or false:
   The lower the frequency of vibration, the higher is the pitch.
   
   Solution:
   Correct answer: False
   This statement is false. The pitch of a sound is determined by its frequency. Higher frequencies correspond to higher pitches, while lower frequencies correspond to lower pitches.
   
   
4. Fill in the blanks:
   (a) The property of sound that animals use to find their way and locate their food is______________.
   (b) ______________ is the instrument used in the laboratory to produce the sound of a fixed frequency.
   (c) The number of vibrations completed in one second is known as _______________.
   (d) Sound absorbing materials are required in auditorium to avoid _______________.
   
   Solution:
   (a) Echo
   (b) Tuning fork
   (c) frequency
   (d) reverberation
   
   
5. Unscramble the following words:
   (a) NATIOCIOSLL
   (b) NELODUSS
   (c) CFRYEQNUE
   
   Solution:
   (a) OSCILLATION
   (b) LOUDNESS
   (c) FREQUENCY
   
   Multiple Choice Questions
   
   
6. Amit is an engineer who is designing a new communication device. He needs to know in which mediums the device will be unable to transmit sound. 
   He has four options: Wood, Water, Air, and Vacuum.
   Can you help Amit by selecting the correct mediums for his device?
   (a) Wood and Water
   (b) Wood, Water, and Air
   (c) Only Vacuum
   (d) Water, Air, and Vacuum 
   
   Correct option: (c) Only vacuum 
   Solution: As we know, sound cannot travel through a vacuum because no particles transmit the vibrations.
   
   
7. 1 Hz = _________.
   (a) One vibration per minute
   (b) 1000 vibrations per minute
   (c) 60 vibrations per minute
   (d) 100 vibrations per minute
   
   Correct option: (c) 60 vibrations per minute.
   Solution: 1 Hz = 1 vibration per second 
   i.e., 1 Hz = 60 vibrations per minute. 
   
   
8. Arun is a marine biologist studying the communication patterns of dolphins. He wants to analyze the sounds produced by dolphins and determine their frequency range. Which frequency range should he focus on to capture and analyze the dolphin's communication sounds?
   (a) between 20 and 20000 Hz
   (b) above 20000 Hz
   (c) below 20 Hz
   (d) between 500 and 10000 Hz
   
   Correct option: (b) above 20000 Hz
   Solution: Arun, the marine biologist studying dolphins, should focus on the frequency range above 20000 Hz, which is ultrasonic in nature, to capture and analyze the dolphin's communication sounds.
   
   
9. Which of the following is a potential solution to mitigate the harmful effects of noise pollution in a residential area?
   (a) Increase the volume of televisions and music systems.
   (b) Set up noise-producing industries near residential areas.
   (c) Remove trees and other natural barriers to sound.
   (d) Build factory far away from residential areas.
   
   Correct option: (d) Build a factory outside residential areas.
   Solution: Conduct noisy operations away from residential areas to reduce noise pollution, minimise the negative impact on residents, and reduce industrial activities and construction work.
   
   
10. In order to reduce the loudness of a sound, we have to
    (a) decrease its amplitude of vibration of the sound.
    (b) decrease its frequency of vibration of the sound.
    (c) increase its frequency of vibration of the sound.
    (d) increase its amplitude of vibration of the sound.
    
    Correct option: (a) decrease its amplitude of vibration of the sound.
    Solution: The loudness of a sound is directly proportional to the amplitude of the sound wave's vibration. Therefore, by decreasing the amplitude of the sound wave's vibration, we can reduce the loudness of the sound.
    
    Subjective Questions
    
    
11. Why can we hear the sound of a clock clearer at night than during the day?
    
    Solution:
    The improved clarity of a clock's sound at night can be attributed to lower background noise due to human activity, less traffic, etc. These factors contribute to a quieter environment, allowing the sound of the clock to be heard more clearly.
    
    
12. How do loudness and pitch of sound depend on amplitude and frequency, respectively?
    
    Solution:
    The greater the amplitude of vibrations, the louder the sound produced.
    The pitch of sound depends on the frequency of sound.
    The higher the frequency, the higher the pitch of the sound.
    
    
13. Why does a vibrating simple pendulum not produce any sound?
    
    Solution:
    Humans can sense the sound waves of frequencies between 20 Hz to 20000 Hz.
    The vibration of the simple pendulum does not produce waves within the audible frequency range.
    Thus, a simple vibrating pendulum does not produce any sound sensation for humans.
    
    
14. What do you mean by musical sound and noise? Give two examples of each. Also, represent musical sound and noise graphically.
    
    Solution:
    Musical sound is a pleasant, continuous and uniform sound produced by regular and periodic vibrations, e.g., the sound produced by a violin, flute, tuning fork etc. Noise is the harsh, unpleasant sound produced by an irregular succession of disturbances and is discontinuous, e.g., the sound produced by a gunshot, cracker bomb etc.
    
    
    
15. State the difference between infrasonic, sonic and ultrasonic sound.
    
    Solution:
    

    Infrasonic	Sonic	Ultrasonic
    It has a frequency less than the audible frequency range.	It has a frequency equal to the audible frequency range.	It has a frequency greater than the audible frequency range.
    Less than 20 Hz	Between 20 Hz to 20000 Hz	More than 20000 Hz
    Sources: Volcanoes, Earthquakes, etc.	Sources: Humans, Animal roars, etc.	Sources: Bats, SONAR, etc.

    
    Assertion-Reasoning Questions
    
    Select the correct answer to these questions from the codes (a), (b), (c) and (d) as given below:
    
16. Assertion: The shape of the outer part of the ear is like a funnel.
    Reason: The eardrum is like a stretched rubber sheet.
    
    Correct option: (b) Both A and R are true, but R is not the correct explanation of the assertion.
    Solution: For the given case, both A and R are true; however, the reason does not provide a correct explanation for the assertion.
    
    
17. Assertion:  The eardrum is not essential for hearing.
    Reason:  The eardrum sends vibrations to the inner ear.
    
    Correct option: (d) A is false, but R is true.
    Solution: The eardrum is an essential part of the hearing process as it separates the outer ear from the middle ear and transmits vibrations to the inner ear, which converts these vibrations into electrical signals sent to the brain for interpretation.
    
    
18. Assertion:  Sound can travel through water.
    Reason: Sound requires a medium for propagation. 
    
    Correct option: (a) Both A and R are true, and R is the correct explanation of the assertion.
    Solution: The assertion that sound can travel through water is true because sound waves require a medium to propagate, and water is a medium that can transmit sound waves due to the close proximity of its molecules, allowing for the transfer of vibrations.
    
    
19. Assertion: In humans, the sound is produced by the larynx.
    Reason: The vocal cords within the larynx vibrate to produce sound waves.
    
    Correct option: (a) Both A and R are true, and R is the correct explanation of the assertion.
    Solution: The larynx contains the vocal cords, which vibrate to produce sound waves, making it the primary organ responsible for sound production in humans.
    
    Case-Based Questions
    
    
20. During science class, Ravi’s teacher explained that the audible range of sound for humans is between 20 Hz and 20,000 Hz. This means that sounds with frequencies below 20 Hz or above 20,000 Hz cannot be heard by humans. Ravi was curious and decided to experiment at home. He used a frequency generator app on his brother’s phone and played sounds with different frequencies. He found that he could not hear sounds with frequencies below 20 Hz or above 20,000 Hz.
    Answer the following question based on the given information.
    (a) What is the audible range of sound for humans?
    (b) Why can’t Ravi hear sounds with frequencies below 20 Hz or above 20,000 Hz?
    (c) How does the frequency of a sound affect its pitch?
    (d) State the difference between high-pitch sound and low-pitch sound.
    
    Solution:
    (a) The audible range of sound for humans is between 20 Hz and 20,000 Hz.
    (b) Ravi can’t hear sounds with frequencies below 20 Hz or above 20,000 Hz because they are outside the audible range of sound for humans. The human ear cannot detect sounds with frequencies outside this range.
    (c) The frequency of a sound affects its pitch. Higher-frequency sounds have a higher pitch, while lower-frequency sounds have a lower pitch.
    (d) High-pitch sound: The sound produced by an object vibrating with a high frequency is called shrill or high-pitched sound.
    Low-pitch sound: The sound produced by an object vibrating with a low frequency is described as a flat or low-pitched sound.