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Geography [4 Mark Question Answer]

Sources of Pollution · ICSE STD 9 (ICSE - English Medium). 2 questions.

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[4 Mark Question Answer]

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Question 14 Marks
Name any three air pollutants and the sources of each of them
Answer
Pollutant :
  1. Carbon Monoxide $(CO) :$
  2. Nitrogen Oxides $(NO_x) :$
  3. Sulphur Oxides $(SO_x) :$
Sources :
  1. Gasoline fuel, motor vehicle fuel, burning of wood and coal, solid waste disposal, industrial processes.
  2. Primary sources are motor vehicles and power generation stations, combustion of organic matters, furnace stacks, incinerators.
  3. Mainly due to the burning of coal, smelting operations, refineries, chemical plants, open burning of garbage, and municipal incinerators.
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Question 24 Marks
How do the airplanes cause noise pollution?
Answer
Noise pollution caused by airplanes has been increasing steadily during recent years, especially in the areas close to international airports. This problem has mainly arisen because of the widespread use of heavy long-range jet aircraft. Noise made by jet planes is more disturbing than that of the old propeller driven aircraft because it is of far higher pitch. Jet noise is caused by the violent mixing of the jet of gases from the engine with the surrounding air. It is at maximum level during take-off when the engine delivers maximum thrust, and falls away rapidly as the aircraft climbs. During landing, the main source of high-frequency noise is the sound made by the air compressor and turbine blades. Aircraft pass close to the ground for quite a distance during the landing operation and this noise often constitutes a more sustained environmental nuisance than the intense noise of shorter duration produced during take-off.
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[4 Mark Question Answer] - Geography STD 9 Questions - Vidyadip