11. What is the purpose of wastewater treatment plants?
a) To generate electricity
b) To conserve water
c) To remove pollutants from wastewater
d) To produce drinking water
Answer: c) To remove pollutants from wastewater
12. What is the main cause of air pollution from vehicles?
a) Exhaust emissions
b) Tire wear
c) Engine noise
d) Vehicle design
Answer: a) Exhaust emissions
13. What are the major sources of noise pollution?
a) Construction sites
b) Television sound
c) Plant respiration
d) Sunlight
Answer: a) Construction sites
14. What is the main cause of soil erosion?
a) Heavy rainfall
b) Plant roots
c) Air pollution
d) Soil fertility
Answer: a) Heavy rainfall
15. What is an example of non-point source pollution?
a) Factory emissions
b) Sewage treatment plants
c) Oil spills
d) Agricultural runoff
Answer: d) Agricultural runoff
