Official Class 8 Science Worksheets: Chapter 13 Sound
Explore reliable practice materials for Chapter 13 Sound tailored for Class 8 learners. Utilizing these Science worksheets ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.
Chapter-wise Practice Material: Chapter 13 Sound
Navigate directly to the printable exercises for Chapter 13 Sound using the digital viewer below. Each practice set allows students to isolate specific topics for thorough review and uninterrupted practice alongside standard textbooks.
A. Check Point
1. What do you mean by frequency?
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Answer: Frequency is the number of vibrations made by a vibrating body in one second. Its SI unit is hertz (Hz).
Teacher's Note: Use the key term in your answer.
2. How is frequency different from the speed of a sound wave?
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Answer: Frequency is how many vibrations take place per second (in Hz); speed is the distance the wave travels per second (in m/s).
Teacher's Note: Give an example if the question allows.
3. What is pitch?
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Answer: Pitch is the shrillness or flatness of a sound as we hear it, which depends on frequency.
Teacher's Note: Write a short, clear answer.
4. Is there a relationship between pitch and frequency?
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Answer: Yes. The higher the frequency, the higher the pitch. Example: a metallic ruler held with a short length outside the table vibrates faster and gives a high-pitched sound, while a longer length vibrates slowly and gives a low pitch.
Teacher's Note: Remember this for your exam.
1. Which instruments produce sound through strings, membranes and wind?
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Answer: Strings: guitar and sitar. Membranes: drum and tabla. Wind: flute and shehnai.
Teacher's Note: Learn this point and write it in your own words.
2. How do the frequencies of a stringed instrument vary?
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Answer: They vary with the length, the thickness and the tightness of the string. A short, thin, tight string gives a higher frequency.
Teacher's Note: Use the key term in your answer.
3. How does a stringed instrument produce sound?
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Answer: When the string is plucked or bowed, it vibrates. The sound box vibrates with it and makes the sound louder.
Teacher's Note: Give an example if the question allows.
4. On what does the pitch of a drum depend? 5. How does it produce sound?
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Answer: The pitch depends on the size and the tightness of the stretched membrane. When a stretched skin is struck, it vibrates and produces sound.
Teacher's Note: Write a short, clear answer.
6. How can we change the frequency in wind instruments?
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Answer: By changing the length of the air column, by covering or opening the holes.
Teacher's Note: Remember this for your exam.
7. Define monotone with examples.
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Answer: A monotone is a sound in which the pitch does not rise or fall, for example a person speaking in a flat voice, or a school bell.
Teacher's Note: Learn this point and write it in your own words.
1. Which unit is used to measure sound? 2. On what does loudness depend?
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Answer: The decibel (dB). Loudness depends on the amplitude of vibration, the energy, the distance from the source and the area of the vibrating body.
Teacher's Note: Use the key term in your answer.
3. What is the quality (timbre) of sound? Why is it different for different instruments?
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Answer: Quality or timbre is the feature that helps us to tell two sounds of the same pitch and loudness apart. Each instrument produces overtones in a different number and strength, so it sounds different.
Teacher's Note: Give an example if the question allows.
B. Keywords
13. Define: sound, frequency, pitch, stringed, membrane and wind instruments, monotone, loudness, amplitude.
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Answer: Sound: energy produced by vibrating bodies that travels in waves. Frequency: the number of vibrations per second. Pitch: the shrillness of a sound. Stringed instrument: one that produces sound by vibrating strings. Membrane instrument: one that uses a stretched skin. Wind instrument: one that uses a vibrating air column. Monotone: a sound of constant pitch. Loudness: the strength of the sound sensation. Amplitude: the maximum displacement of a vibrating body from its rest position.
Teacher's Note: Write a short, clear answer.
C. Multiple Choice Questions
(i) Loudness is measured in (a) newton (b) decibel (c) metre (d) watt
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Answer: (b) Decibel.
Teacher's Note: Remember this for your exam.
(ii) ____ instruments have stretched strings. (a) membrane (b) wind (c) strings (d) none
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Answer: (c) Strings.
Teacher's Note: Learn this point and write it in your own words.
(iii) The sensation of ____ is the pitch. (a) tone (b) volume (c) frequency (d) all
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Answer: (c) Frequency.
Teacher's Note: Use the key term in your answer.
(iv) Not a musical instrument: (a) stringed (b) weighing (c) membrane (d) wind
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Answer: (b) Weighing instrument.
Teacher's Note: Give an example if the question allows.
(v) If the string is tight, the frequency is (a) low (b) high (c) no change (d) can't say
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Answer: (b) High.
Teacher's Note: Write a short, clear answer.
(vi) Monotone refers to (a) a single tone (b) no rise or fall of pitch (c) tone does not vary (d) all
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Answer: (d) All of the above.
Teacher's Note: Remember this for your exam.
(vii) If the surface area of the membrane is large, the pitch is (a) low (b) high
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Answer: (a) Low.
Teacher's Note: Learn this point and write it in your own words.
(viii) Membranes are generally made of (a) rubber (b) leather (c) cotton (d) plastic
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Answer: (b) Leather (stretched skin).
Teacher's Note: Use the key term in your answer.
(ix) Not a stretched-skin instrument: (a) drum (b) tabla (c) trumpet (d) mridangam
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Answer: (c) Trumpet.
Teacher's Note: Give an example if the question allows.
(x) An example of an air column: (a) guitar (b) flute (c) sitar (d) tabla
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Answer: (b) Flute.
Teacher's Note: Write a short, clear answer.
D. Fill in the Blanks, True or False, Match
24. Fill in the blanks: 1. Sound is a type of energy produced by ____. 2. ____ travels in waves. 3. The number of vibrations in one second is called ____. 4. ____ is indicated by the height of the crest and depth of the trough. 5. ____ denotes the shrillness or flatness of a sound. 6. Stringed instruments have a ____ that vibrates and makes the sound louder. 8. The ____ of the string depends on how loose or tight it is. 10. ____ instruments are made of long hollow pipes with holes.
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Answer: 1. vibrations; 2. Sound; 3. frequency; 4. Amplitude; 5. Pitch; 6. sound box; 8. pitch; 10. Wind.
Teacher's Note: Remember this for your exam.
25. True or False: 1. Loudness is proportional to the cube of the amplitude. 2. The larger the vibrating area, the louder the sound. 3. A note is not produced by a combination of frequencies. 4. The quality of a note does not depend on overtones. 5. The pitch of women's and children's voices is lower than men's. 6. A big drum produces a louder sound than a small drum. 7. The loudness of a whisper is 30 to 40 dB. 8. Loudness less than 80 dB is sound pollution. 9. Loudness depends on energy. 10. One cannot produce different pitches from the same string.
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Answer: 1. False (square of the amplitude); 2. True; 3. False; 4. False; 5. False (higher); 6. True; 7. True; 8. False (more than 80 dB is noise pollution); 9. True; 10. False.
Teacher's Note: Learn this point and write it in your own words.
26. Match: 1. SI unit of frequency 2. stringed instruments 3. membranes 4. wind instruments 5. monotone 6. larger amplitude 7. harmonics 8. the loudest and lowest notes 9. cluster 10. instruments that produce different musical notes.
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Answer:
| Column I | Column II |
|---|---|
| 1 | c. Hertz |
| 2 | i. Guitar |
| 3 | e. Mridangam |
| 4 | a. Shehnai |
| 5 | g. Pitch does not vary |
| 6 | j. Louder sound |
| 7 | h. Overtones |
| 8 | b. Fundamentals |
| 9 | f. Things that produce monotone |
| 10 | d. Musical instruments |
Teacher's Note: Use the key term in your answer.
E. Answer the Following
1. Differentiate between the frequency and the speed of a sound wave.
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Answer:
| Frequency | Speed |
|---|---|
| Number of vibrations in one second | Distance travelled by the wave in one second |
| Unit: hertz | Unit: metre per second |
| Decides the pitch | Depends on the medium |
Teacher's Note: Give an example if the question allows.
2. Explain the relationship between pitch and frequency with a metallic ruler.
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Answer: Press one end of a ruler on a table and pluck the free end. With a long free part, the ruler vibrates slowly and gives a low-pitched sound. Shorten the free part and it vibrates faster, giving a higher pitch. So a higher frequency means a higher pitch.
Teacher's Note: Write a short, clear answer.
3. Short note on musical instruments.
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Answer: Musical instruments produce notes by vibrations. There are three types: stringed (guitar, sitar), membrane (drum, tabla) and wind (flute, shehnai).
Teacher's Note: Remember this for your exam.
4. Short note on loudness.
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Answer: Loudness is the strength of a sound as the ear senses it. It is measured in decibels. It depends on amplitude, energy, distance and the area of the vibrating body.
Teacher's Note: Learn this point and write it in your own words.
5. How does loudness depend on the amplitude of vibration?
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Answer: When an object vibrates with a large amplitude, it transfers more energy to the air, so the sound is loud. A small amplitude gives a soft sound. Loudness is proportional to the square of the amplitude.
Teacher's Note: Use the key term in your answer.
Free study material for Science
Practice Worksheet and Study Resources for Class 8 Science Chapter 13 Sound
Download Practice Sheet: Chapter 13 Sound (Class 8 Science)
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FAQs
You can download the teacher-verified PDF for CBSE Class 8 Science Sound Worksheet Set 08 from StudiesToday.com. These practice sheets for Class 8 Science are designed as per the latest CBSE academic session.
Yes, our CBSE Class 8 Science Sound Worksheet Set 08 includes a variety of questions like Case-based studies, Assertion-Reasoning, and MCQs as per the 50% competency-based weightage in the latest curriculum for Class 8.
Yes, we have provided detailed solutions for CBSE Class 8 Science Sound Worksheet Set 08 to help Class 8 and follow the official CBSE marking scheme.
Daily practice with these Science worksheets helps in identifying understanding gaps. It also improves question solving speed and ensures that Class 8 students get more marks in CBSE exams.
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