Sound is an essential part of our daily lives. It helps us communicate, enjoy music, and even detect danger. Chapter 10 of Class 8 Science explains how sound is produced by vibrating objects. This chapter teaches you how sound travels through different mediums like solids, liquids, and gases. You’ll also learn about important properties of sound, like amplitude, frequency, and pitch, which make each sound unique.
The MCQs and match-the-following questions below provide a fun way to revise the chapter. The questions cover topics like the working of the human ear, the role of vocal cords, and the causes of noise pollution. Let’s now start mastering the science of sound.
Class 8 Science Chapter 10 MCQ Online Test Questions and Answers
Question 1. How is sound produced?
a) By still objects
b) By vibrating objects
c) By heating objects
d) By rotating objects
Answer:
b) By vibrating objects
Question 2. What is the function of the vocal cords?
a) To amplify sound
b) To produce sound
c) To block air flow
d) To detect sound
Answer:
b) To produce sound
Question 3. What determines the loudness of a sound?
a) Frequency of vibration
b) Amplitude of vibration
c) Speed of sound
d) Distance from the source
Answer:
b) Amplitude of vibration
Question 4. What unit is used to measure frequency?
a) Decibel
b) Meter
c) Hertz
d) Pascal
Answer:
c) Hertz
Question 5. What is the range of audible frequencies for humans?
a) 0 to 100 Hz
b) 20 to 20,000 Hz
c) 1,000 to 10,000 Hz
d) Above 20,000 Hz
Answer:
b) 20 to 20,000 Hz
Question 6. What type of sound is produced when the frequency is low?
a) Shrill sound
b) High-pitched sound
c) Low-pitched sound
d) No sound
Answer:
c) Low-pitched sound
Question 7. What does noise pollution lead to?
a) Improved hearing
b) Health problems
c) Clear communication
d) Increased energy
Answer:
b) Health problems
Question 8. Why does sound not travel in space?
a) Space is too hot
b) Space lacks a medium
c) Space absorbs sound
d) Sound does not work in zero gravity
Answer:
b) Space lacks a medium
Question 9. Which instrument uses vibrating air to produce sound?
a) Tabla
b) Flute
c) Guitar
d) Drum
Answer:
b) Flute
Question 10. What is the function of the eardrum in humans?
a) To block sound
b) To amplify sound
c) To detect sound vibrations
d) To produce sound
Answer:
c) To detect sound vibrations
Question 11. What affects the pitch of a sound?
a) Amplitude of vibration
b) Frequency of vibration
c) Distance from source
d) Medium of travel
Answer:
b) Frequency of vibration
Question 12. What happens to sound when the amplitude increases?
a) It becomes louder
b) It becomes softer
c) It remains the same
d) It travels faster
Answer:
a) It becomes louder
Question 13. What causes a whistle to produce a high-pitched sound?
a) Low frequency vibrations
b) High frequency vibrations
c) Large amplitude vibrations
d) No vibrations
Answer:
b) High frequency vibrations
Question 14. What type of sound is unpleasant to the ears?
a) Music
b) Noise
c) Melody
d) Echo
Answer:
b) Noise
Question 15. What type of vibration produces louder sound?
a) Small amplitude vibrations
b) Large amplitude vibrations
c) Low frequency vibrations
d) No vibrations
Answer:
b) Large amplitude vibrations
Question 16. How do we reduce noise pollution?
a) By planting trees
b) By increasing volume
c) By using loudspeakers
d) By creating echoes
Answer:
a) By planting trees
Question 17. What is an example of noise pollution?
a) Musical concert
b) Loud vehicle horns
c) Birds chirping
d) Waterfall sound
Answer:
b) Loud vehicle horns
Question 18. What makes children’s voices different from adults’?
a) High frequency vocal cords
b) Low frequency vocal cords
c) Large vocal cords
d) No vocal cords
Answer:
a) High frequency vocal cords
Question 19. What is the main reason for different voices in men and women?
a) Different vocal cord lengths
b) Different ear structures
c) Different lung sizes
d) Different air passages
Answer:
a) Different vocal cord lengths
Question 20. How does sound travel in solids?
a) As light waves
b) As vibrations
c) As heat energy
d) As chemical reactions
Answer:
b) As vibrations
Question 21. What is the role of the larynx in sound production?
a) Amplifies sound
b) Produces vibrations
c) Filters noise
d) Absorbs sound
Answer:
b) Produces vibrations
Question 22. Why do we hear thunder after seeing lightning?
a) Light travels faster than sound
b) Sound travels faster than light
c) Thunder is louder than lightning
d) Lightning blocks sound waves
Answer:
a) Light travels faster than sound
Question 23. What determines the shrillness of sound?
a) Amplitude of vibration
b) Frequency of vibration
c) Speed of sound
d) Medium of travel
Answer:
b) Frequency of vibration
Question 24. What does the unit ‘decibel’ measure?
a) Frequency
b) Speed
c) Loudness
d) Pitch
Answer:
c) Loudness
Question 25. Which part of the ear vibrates to detect sound?
a) Outer ear
b) Eardrum
c) Ear canal
d) Cochlea
Answer:
b) Eardrum
Question 26. What type of sound has a frequency above 20,000 Hz?
a) Audible sound
b) Ultrasound
c) Infrasound
d) Noise
Answer:
b) Ultrasound
Question 27. Which animals can hear ultrasonic sounds?
a) Cats
b) Dogs
c) Humans
d) Elephants
Answer:
b) Dogs
Question 28. What type of sound is used in medical imaging?
a) Audible sound
b) Ultrasound
c) Infrasound
d) Noise
Answer:
b) Ultrasound
Question 29. How can loud noise harm humans?
a) Improves focus
b) Increases hearing ability
c) Causes hearing impairment
d) Reduces body temperature
Answer:
c) Causes hearing impairment
Question 30. What is the time taken for one complete vibration called?
a) Frequency
b) Amplitude
c) Time period
d) Oscillation
Answer:
c) Time period
Question 31. What type of vibration does a drum produce?
a) High-pitched sound
b) Low-pitched sound
c) Silent sound
d) No sound
Answer:
b) Low-pitched sound
Question 32. What is an effective way to reduce noise pollution?
a) Use of silencers in machines
b) Use of more horns
c) Increasing volume levels
d) Building echo chambers
Answer:
a) Use of silencers in machines
Question 33 – Match the Following
| Column A | Column B |
|---|---|
| 1. Unit of frequency | A. Decibel |
| 2. Range of audible frequencies for humans | B. 500 Hz |
| 3. Unit of loudness | C. Hertz |
| 4. Frequency of human voice | D. 20 to 20,000 Hz |
| 5. Sound caused by unwanted noise | E. Noise pollution |
Answer:
| Column A | Correct Answer |
|---|---|
| 1. Unit of frequency | C. Hertz |
| 2. Range of audible frequencies for humans | D. 20 to 20,000 Hz |
| 3. Unit of loudness | A. Decibel |
| 4. Frequency of human voice | B. 500 Hz |
| 5. Sound caused by unwanted noise | E. Noise pollution |
