Sound class 6 Questions & Answers


Important points to remember :

  1. Vibrations are required for the production of sound. 
  2. A medium is required for the propagation of sound. 
  3. Sound is propagated through gaseous, liquid and solid mediums. 
  4. Noise is disagreeable, irregular and loud. 
  5. Noise pollution occurs due to continuous noise. Noise pollution has adverse effects on our health. Heavy traffic and industrial areas cause the maximum noise pollution. 
  6. Noise pollution is a social problem. 
  7. It is necessary that everybody takes measures to prevent noise pollution. 
  8. Blowing the horns of vehicles is prohibited near places like schools and hospitals. These rules should always be  followed. 
  9. The vibration of an object is necessary for the production of sound. As long as the object vibrates, the sound is heard. When the vibration stops, the sound also stops. 
  10. Transmission of sound occurs at a different speed through different mediums. Transmission of sound is faster through a liquid than through a gas, and faster through a solid than through a liquid.


Question 1 : Fill in the blanks with the proper words.
a) The propagation of sound does not occur through a vacuum.

b) Noise pollution is a social issue.

c) The sound which is disagreeable to the ears is called noise.

d) Noise has adverse effects on our health.

Question 2: What should we do ?
a) The silencer of a motorcycle is broken.
Answer : The silencer of a motorcycle plays a very important role in the overall performance of a motorcycle. When the silencer is broken, the motorbike will no longer be silenced and it will produce a loud noise. Now some people would like it but some would hate it because it can easily induce a headache.

b) A factory in the surroundings is producing continuous loud noise.
Answer : If a factory in the surroundings is producing continuous loud noise, then we can lodge a complaint against the factory to a local government body citing the troubles faced by the residents around and the danger it is causing to the environment.


Question 3 : Write the answers in your own words.
a) What is meant by vibration ?
Answer : Vibration means quickly moving back and forth (or up and down) about a point of equilibrium. The vibration may be periodic (having a pattern) or random. Something that is vibrating may shake at the same time. The time it takes a vibrating object to go back and forth completely is the period.

b) Explain with the help of practical examples how sound is propagated through solids
Answer : Sound requires medium for propagation like solids, liquids and gases. ... We will hear the Sound of tapping through wooden bench. This means sound can travel through wood which is solid. 2 Let us take a meter scale made up of metal hold one end close to your ear and ask your friend to scratch other end.

c) What is meant by noise pollution?
Answer : Noise pollution or sound pollution is defined as any sound that is unwanted, or a level of environmental sound that is likely to irritate nearby individuals, cause distraction, cause hearing damage, or disrupts normal activities and lowers quality of life.

d) What measures will you take to control noise pollution ?
Answer : We can Reduce Noise pollution by turning off appliances when not in use, use of earplugs, lowering the volume, planting more trees, regular maintenance of vehicles and machines etc.

  1. By controlling noise we can control negative health effects that noise pollution has on everyone.
  2. silencers must be installed in vehicles such as motorcycles, cars, trucks, buses, and other noise producing machines.
  3. We should watch television and listen to music at a low volume. Also, use of loudspeakers as well as horns of buses and trucks should be minimized.
  4. Regular maintenance of automobiles should be done so that noise produced by them can be kept under check.
  5. More trees should be planted in residential areas as they help in reducing noise.


# Can you tell
1. If a bell is hung in a vacuum container, will its sound be heard outside?
Answer : If a bell is hung in a vacuum container, will its sound be heard outside? The bell should not produce any sound in the vacuum. However, depending on how the bell is hung, the vibrations can be transmitted to the housing and create sound on the outside.


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