$2.$ Which process is commonly used for the removal of suspended solids from water?

a$)$ Sedimentation

b$)$ Filtration

c$)$ Reverse osmosis

d$)$ Distillation

What is the primary purpose of adding chlorine during water treatment?

a$)$ To adjust pH

b$)$ To remove suspended solids

c$)$ To disinfect water

d$)$ To soften water

Which of the following is NOT a method of physical water treatment?

a$)$ Filtration

b$)$ Coagulation

c$)$ Sedimentation

d$)$ Aeration

What is the primary purpose of coagulation in water treatment?

a$)$ To remove dissolved gases

b$)$ To enhance filtration

c$)$ To remove suspended particles

d$)$ To adjust pH