Kerala Syllabus Class 9 Physics - Chapter 8 Sound - Questions and Answers
Questions and Answers for Class 9 Physics ശബ്ദം | Text Books Solution Physics (English Medium) Physics: Chapter 08 Sound - Questions and Answers | SAMAGRA Question Bank
ഒമ്പതാം ക്ലാസ്സ് ഫിസിക്സിലെ Sound എന്ന പാഠം ആസ്പദമാക്കി തയ്യാറാക്കിയ ചോദ്യോത്തരങ്ങള്.
Class 9 Physics - Sound - Question Bank
∎Physics (English Medium Notes)
1. The form of energy that creates the sensation of hearing is............. (sound, light, heat)
Answer: Sound
2. Sound is produced by the ............. of objects.
(motion, conduction, oscillation, vibration)
Answer: Vibration
3. Write a definition for sound.
Answer: Sound is the form of energy that gives the sense of hearing.
4. How is sound produced?
Answer: Sound is produced by the vibration of objects.
5. Objects that produce sound are called .............
(sources of sound, sources of energy, sources, sources of water)
Answer: Sources of sound
6. When we speak, sound is produced when the ............. in the voice box vibrate.
(eardrum, vocal cords, ear cup, air)
Answer: Vocal cords
7. The part that vibrates when a bee makes a sound is ............. (wing, vocal cords, muscles, legs)
Answer: wing
8. Sound cannot travel through .............
(vacuum, solid medium, medium, liquid medium)
Answer: vacuum
9. When a stretched rubber band is plucked, its motion is .............
(linear motion, oscillation, circular motion, vibratory motion)
Answer: vibratory motion
10. Any............. can travel not only through gases but also through liquids and solids.
(Sound, light, heat, none of these)
Answer: Sound
11. A snake uses sound transmission............. to catch prey. (through the ground, through the air, through a vacuum, through water)
Answer: through the ground
12. The speed of sound in different mediums is .............
(different, the same, increases and decreases by the same quantity, none of these)
Answer: Different
13. The speed of sound is highest when the substance is in a ............. state.
(solid, liquid, gaseous, none of these)
Answer: solid
14. The part of the ear that can vibrate is .............
(ear canal, middle ear, inner ear, eardrum)
Answer: eardrum
15. The ............. sends vibrations to the inner ear. (vocal cords, earcup, air, eardrum)
Answer: eardrum
16. A sound that is produced by regular vibrations and is pleasant to hear is called .............
(noise, pitch, loudness, music)
Answer: music
17. List two situations where sound is useful in life.
Answer:
• Communication
• To escape from danger
18. Which part vibrates primarily when the following musical instruments are played?
a) Flute b) Mridangam
Answer:
a) Air
b) Leather
19. The main part that vibrates when musical instruments like the veena and violin are played is the strings. Along with the strings, list the other parts that vibrate.
Answer: Wooden frame, air
20. Find out and write which part of the body of the following creatures vibrates primarily when they make a sound.
a) Cricket b) Cuckoo
Answer:
a) Wings b) Vocal cords
21. Why do astronauts have to use radio systems to talk to each other?
Answer: Sound needs a medium to travel. Since there is no air in space, they use radio systems.
22. Through which medium do the following creatures use sound transmission for various purposes?
a) Snake b) Dolphin
Answer:
a) Sound transmission through the ground
b) Sound transmission through seawater
23. Does sound travel at the same speed through all mediums? Why?
Answer: No, the speed of sound is different in different mediums.
When the temperature of the medium changes, the speed of sound through it also changes. As the temperature increases, the speed of sound increases.
24. Even though lightning and thunder occur at the same time, we hear the thunder after seeing the lightning. Why?
Answer: The speed of light in air is very high (3 × 10⁸ m/s). But the speed of sound in air is only 350 m/s. So lightning and thunder occur at the same time, its light is seen instantly by a person standing far away.
25. List two problems faced by people who are audio-impaired
Answer:
• A barrier to communication
• Prone to accidents
26. What kind of approach should be taken towards people who are audio-impaired? (Mention any two)
Answer:
• Be empathetic.
• Give consideration and include them in all activities.
27. Write the names of two people who have overcome hearing impairment and achieved success in life.
Answer:
• Beethoven
• Helen Keller
28. a) Which instrument is used for hearing tests?
b) Write the name of an electronic device that helps create a hearing experience.
Answer:
• Audiometer
• Hearing Aid
29. What is the difference between a musical note and noise?
Answer: A sound that has regular vibrations and is pleasant to hear is music. A sound that has irregular vibrations and is unpleasant is noise.
30. Write the names of two devices used to protect the ears.
Answer:
• Ear muffs
• Earplugs
31. What are the causes of noise pollution?
Answer:
• Increasing number of vehicles
• Public address systems
• Construction Activities
32. What is meant by sound pollution?
Answer:
Noise pollution is the production of unpleasant, disturbing and unwanted noise that harms human beings and other organisms.
33. What are the measures that can be taken to reduce sound pollution?
Answer:
• Those who work in the construction sector, mines etc., should use ear muffs to protect their ears.
• Use hearing protection devices such as earplugs in areas where high-powered machinery and equipment are operated.
• Don’t use air horns in vehicles.
• Ensure that silencers in vehicles are working efficiently.
• Use box-type instead of horn-type loudspeakers.
• Plant more trees to reduce noise pollution.
• Don’t use loudspeakers in public places before 6 am and after 10 pm.
• Avoid loud noise near hospitals, schools, courts, etc.
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