$4.$Which of the following is NOT a component of a typical reverse osmosis system?

a$)$ Sediment filter

b$)$ Carbon filter

c$)$ Ultraviolet lamp

d$)$ Reverse osmosis membrane

What is the typical rejection rate of dissolved salts in reverse osmosis?

a$)50-60\%$

b$)70-80\%$

c$)90-99\%$

d$)100\%$

Which of the following is a disadvantage of reverse osmosis desalination?

a$)$ High energy consumption

b$)$ Low efficiency in removing salts

c$)$ Limited applicability to brackish water

d$)$ High initial cost

Which desalination method uses an electric field to drive ions through ion$-$selective membranes?

a$)$ Reverse osmosis

b$)$ Electrodialysis

c$)$ Distillation

d$)$ Nanofiltration