Noise Pollution


Sound II - Concepts
Class - Navodaya Entrance 9th Subjects
 
 
Concept Explanation
 

Noise Pollution

Noise Pollution: Unpleasant, discomfort-causing sound from any source is called noise. Sustained presence of harmful, unwanted, or annoying noise in the environment is called noise pollution.

Source Of Noise Pollution: Any object that produces a noise is a potential source of noise pollution. Some examples are automobiles, blaring loudspeakers, television and radio (when played at a loud volume), air coolers, and air conditioners.

Harmful Effects Of Noise Pollution: Noise has a jarring effect on us. The effect of noise pollution on people should not be underestimated. Here are some of the harmful effects of noise pollution: 

  • Irritation and loss of concentration.
  • Sleep disturbance and stress ( which can lead to high blood pressure);
  • Ear damage and loss of hearing (which may result from exposure to a sudden loud noise or from continuous exposure to noise over a period of time).
  • Measures To Reduce Noise Pollution: Minimizing noise pollution requires a certain degree of discipline from all of us. Some of the measures one should adopt to keep noise pollution under control are given below: 

  • The use of loudspeakers should be avoided.
  • People living in flats (and houses close to each other) should not talk too loudly or play the television/music too loudly so as not to disturb their neighbors.
  • While driving, people should avoid playing loud music and using the horn unnecessarily.
  • Noise and Music : The sound which produces pleasant effects on our ears and mind is called musical sound e.g. the  sound produced by musical instruments, such as piano, violin, flute etc. is musical sound. The sound level in musical sound usually lies between 10db and 30db.

    Musical sound differ from noise : The wave form of musical sound is present in regular manner, while it is noise it is irregular. The frequency of musical sound is high and of noise is low. The nature of vibration of musical sound is regular and periodic, while in noise it is irregular and non periodic.

    The effect of musical sound in ear and mind of a person is pleasent and comfortable and the effect of noise is displeasing and discordant.

    Sample Questions
    (More Questions for each concept available in Login)
    Question : 1

    The amplitude of vibration and its frequency can change suddenly in a __________________

    Right Option : C
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    Explanation
    Question : 2

    The sound which produces pleasant effects on our ears and mind is called _______________.

    Right Option : C
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    Explanation
    Question : 3

    In _______________ it is irregular and non periodic.

    Right Option : B
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    Explanation
     
     
     


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