9th Class

9th Class English Book Noise in the Environment Short Questions

9th Class English Book

 Unit-11 Noise in the Environment Short Question

(i) How do you define noise pollution?
Ans. Disturbing or excessive noise that disrupts normal functioning of life is referred to as noise pollution. The source of most outdoor noise worldwide is mainly caused by machines and transportation systems, motor vehicles, aircraft, and trains. 
(ii) How is transport a source of noise pollution?
Ans. Sound of horns of vehicles on roads, fast running of trains on their tracks and aeroplanes flying over houses produce disturbing and excessive noise that disrupts normal functioning of life. So transport is a source of noise pollution.
(iii) How is construction work a cause of noise pollution?
Ans. Transport of heavy vehicles and the sounds of grilling and boring at construction sites produce disturbing noise that disrupts normal functioning of the life of surrounding residents. So construction work is a very common cause of noise pollution. 
(iv) How is use of technology causing noise pollution?
Ans. Turbines, music players, TV, electricity generators, cell phones and other such equipment of technology produce increasing levels of unwanted noise of varying types and intensities throughout the day and night that disturb sleep, concentration, and other functions. 
(v) Why is noise dangerous for human health?
Ans. Noise health effects are the health consequences of regular exposure, to consistent elevated sound levels. Noise leaves hazardous impact on human health. It causes restlessness, hypertension, stress, hearing loss, aggression, depression and sleeplessness.
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