Strategies to Control Environmental Pollution — Prelims Questions

Which of the following is NOT a primary method for controlling particulate matter air pollution from industrial sources?

In the secondary treatment of wastewater, what is the main role of the aerobic microbial flocs?

Which of the following statements correctly describes the 'Reduce' aspect of the 3R principle?

A catalytic converter in a vehicle converts nitrogen oxides ($ext{NO}_x$) into which of the following less harmful substances?

Which of the following techniques involves using plants to remove pollutants from contaminated soil or water?

Which of the following is an incorrect statement regarding the control of sulfur dioxide ($ext{SO}_2$) emissions?