1. What is the primary purpose of water treatment?
a. Enhancing color
b. Reducing taste
c. Improving odor
d. Providing safe drinking water
Answer: d. Providing safe drinking water
2. What is the most common method used for disinfection in water treatment plants?
a. Filtration
b. Chlorination
c. Sedimentation
d. Aeration
Answer: b. Chlorination
3. What does the term “coagulation” refer to in water treatment?
a. Removal of dissolved minerals
b. Settling of solid particles
c. Clumping together of small particles
d. Filtration of microorganisms
Answer: c. Clumping together of small particles
4. Which of the following is a common waterborne pathogen that needs to be eliminated in water treatment?
a. Algae
b. E. coli
c. Fungi
d. Viruses
Answer: b. E. coli
5. What is the purpose of adding alum during water treatment?
a. Disinfection
b. pH adjustment
c. Coagulation
d. Sedimentation
Answer: c. Coagulation
6. Which of the following is a physical water treatment process?
a. Ozonation
b. Activated carbon adsorption
c. Reverse osmosis
d. Sedimentation
Answer: d. Sedimentation
7. What is the role of activated carbon in water treatment?
a. Disinfection
b. pH adjustment
c. Adsorption of impurities
d. Coagulation
Answer: c. Adsorption of impurities
8. What is the purpose of adding chlorine dioxide in water treatment?
a. pH adjustment
b. Disinfection
c. Softening
d. Coagulation
Answer: b. Disinfection
9. What does BOD stand for in the context of water quality assessment?
a. Biochemical Oxygen Demand
b. Biological Organic Decomposition
c. Basic Oxygen Dissolution
d. Bacterial Oxidation Density
Answer: a. Biochemical Oxygen Demand
10. What is the recommended pH range for drinking water?
a. 2-4
b. 7-9
c. 4-6
d. 6.5-8.5
Answer: d. 6.5-8.5
11. What is the primary purpose of water treatment?
a) Flavor enhancement
b) Odor reduction
c) Removal of impurities and contaminants
d) Color improvement
Answer: c) Removal of impurities and contaminants
12. What is the common method used for disinfection in water treatment plants?
a) Filtration
b) Sedimentation
c) Chlorination
d) Aeration
Answer: c) Chlorination
13. Which of the following is a waterborne disease that can be prevented through proper water treatment?
a) Malaria
b) Cholera
c) Dengue
d) Tuberculosis
Answer: b) Cholera
14. What is the purpose of coagulation in water treatment?
a) pH adjustment
b) Disinfection
c) Formation of flocs
d) Sedimentation
Answer: c) Formation of flocs
15. Which chemical is commonly used for pH adjustment in water treatment?
a) Sodium chloride
b) Hydrogen peroxide
c) Sodium hydroxide
d) Calcium carbonate
Answer: c) Sodium hydroxide
16. What is the role of activated carbon in water treatment?
a) Disinfection
b) pH adjustment
c) Adsorption of impurities
d) Sedimentation
Answer: c) Adsorption of impurities
17. What is the purpose of aeration in the water treatment process?
a) pH adjustment
b) Oxygenation and removal of gases
c) Disinfection
d) Sedimentation
Answer: b) Oxygenation and removal of gases
18. Which of the following is a physical water treatment process?
a) Reverse osmosis
b) Ultraviolet (UV) disinfection
c) Coagulation
d) Filtration
Answer: d) Filtration
19. What does the term “hard water” refer to in the context of water quality?
a) Water with high turbidity
b) Water with high alkalinity
c) Water with high mineral content
d) Water with low pH
Answer: c) Water with high mineral content
20. What is the purpose of a water distribution system in the context of water treatment?
a) Water storage
b) Water conveyance to consumers
c) Water treatment
d) Water filtration
Answer: b) Water conveyance to consumers