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प्रश्न
Air pollution is caused by ______.
विकल्प
Organic and inorganic industrial effluents discharged into rivers
Presence of high proportion of sulphur dioxide, carbon monoxide and air-borne particulate materials
Unwanted sounds from industries, generators, saws and pneumatic and electric drills
Overdrawing of groundwater
MCQ
रिक्त स्थान भरें
उत्तर
Air pollution is caused by presence of high proportion of sulphur dioxide, carbon monoxide and air-borne particulate materials.
shaalaa.com
Industrial Pollution and Environmental Degradation
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