NCERT 8th Class (CBSE) Science: Pollution of Water and Air – Quiz
23 Multiple Choice Questions related to NCERT 8th Class (CBSE) Science: Pollution of Water and Air – Quiz:
- Water is renewed continuously in nature through the water cycle.
- Water containing harmful impurities is said to be polluted. Pollution occurs due to dumping of untreated sewage, factory wastes, or due to run off of pesticides and fertilizers into water sources.
- Water can be made potable by filtering and killing germs.
- Air is mainly polluted by suspended particulate matter, carbon monoxide, excess carbon dioxide, sulphur dioxide, nitrogen dioxide, CFCs and lead.