Sound - Standard 6 - General Science - Balbharati

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 13. Sound 

Exercise

Q. 1 Fill in the blanks.

(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.


Q. 2 What should we do?

(a) The silencer of a motorcycle is broken.

Ans. Get the silencer repaired immediately. Do not use the vehicle unnecessarily and avoid disturbing others.

(b) A factory in the surroundings is producing continuous loud noise.

Ans. Inform the factory management politely and request noise-control measures. If it continues, report to local authorities. Use ear protection if needed.


Q. 3 Answer in your own words.

(a) What is meant by vibration?

Ans. Vibration is the rapid back-and-forth movement of an object. Sound is produced when an object vibrates.

(b) Explain with practical examples how sound is propagated through solids.

Ans. Sound travels through solids when vibrations pass from one particle to another. For example, when you place your ear on a table, you can clearly hear someone tapping on the other end. Railway tracks also carry the sound of an approaching train.

(c) What is meant by noise pollution?

Ans. The continuous or very loud unpleasant sound that harms people and disturbs normal activities is called noise pollution.

(d) What measures will you take to control noise pollution?

  1. Avoid unnecessary honking.
  2. Keep volume of TV and music low.
  3. Repair noisy vehicles and machines.
  4. Follow ‘No Horn’ rules near hospitals and schools.
  5. Support rules that control loudspeakers and industrial noise.

Q. 4 Complete the table.

Nature of sound Unpleasant Pleasant
Speaking ✔
Whispering ✔
Aeroplane sounds ✔
Horns of vehicles ✔
Railway engine ✔
Rustling of leaves ✔
Neighing of a horse ✔
Ticking of a clock ✔

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