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Sound Class 9 Worksheet Science Chapter 11

Q.1. Fill in the blanks
(i) Quality of sound depends on ________ .
(ii) The speed of sound in a solid is ________ than the speed of sound in air.
(iii) Sound is caused by _________.
(iv) Pitch of sound depends on ________.
(v) Sound cannot travel through _______.

Q.2. If 25 sound waves are produced per second, what is the frequency in hertz?
(a) 25 hertz
(b) 50 hertz
(c) 75 hertz
(d) 1/25 hertz

Q.3. Which of the following vibrates when a musical note is produced by the cymbals in an orchestra?
(a) Stretched strings
(b) Stretched membranes
(c) Metal plates
(d) Air columns

Q.5. Frequency of ultrasonic sound wave is
(a) Greater than 20 HZ
(b) Greater than 20,000 HZ
(c) Greater than 2 HZ
(d) Greater than 2 MHZ

Q.6. Why are the ceilings of concert halls curved?

Q.7. What happens when sound travels in air?

Q.8. What is an echo? Name two areas of its application?

Q.9. What is SONAR? Write its working?

Q.10. How can ultrasound be used to detect the defect in metal block?

Q.11. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend?

Q.12. Sound requires a medium to travel? Justify experimentally.

Q.13. How does the sound produced by a vibrating object in a medium reach your ear?

Q.14. Why are sound waves called as mechanical waves?

Q.15. Explain how sound is produced by your school bell.

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FAQs on Sound Class 9 Worksheet Science Chapter 11

1. What is sound?
Ans. Sound is a form of energy that is produced by vibrating objects and travels in waves through mediums such as air, water, or solids. It can be heard by the human ear and is essential for communication and understanding our surroundings.
2. How does sound travel through different mediums?
Ans. Sound travels through different mediums by vibrating particles in that medium. In solids, sound travels fastest because the particles are closely packed, allowing the vibrations to pass from one particle to another more easily. In liquids, sound travels slower as the particles are further apart, while in gases such as air, sound travels even slower due to the larger gaps between particles.
3. What is the speed of sound?
Ans. The speed of sound varies depending on the medium it travels through. In dry air at sea level, sound travels at a speed of approximately 343 meters per second (or about 767 miles per hour). However, the speed of sound can change depending on factors such as temperature, humidity, and the composition of the medium.
4. How does sound affect our daily lives?
Ans. Sound plays a crucial role in our daily lives. We rely on sound to communicate and understand each other through speech and other forms of audio. It also helps us recognize and interpret various sounds, such as alarms, music, and environmental cues. Sound can evoke emotions, create ambiance, and provide information about our surroundings, making it an essential aspect of our existence.
5. What are the different characteristics of sound?
Ans. Sound has several characteristics, including pitch, frequency, amplitude, and timbre. Pitch refers to how high or low a sound is, which is determined by the frequency of the sound waves. Frequency represents the number of vibrations per second and is measured in hertz (Hz). Amplitude refers to the intensity or volume of the sound, while timbre describes the quality or tone of the sound, allowing us to differentiate between different sources of sound.
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