Taste and Odour Control
1. Q: Which method is primarily used for taste and odour control in drinking water?
A) Chlorination
B) Adsorption using activated carbon
C) Reverse osmosis
D) Filtration
Answer: B) Adsorption using activated carbon
2. Q: Activated carbon is primarily used in water treatment for:
A) Filtration
B) Adsorption
C) Precipitation
D) Flocculation
Answer: B) Adsorption
2. Iron and Manganese Removal
3. Q: The removal of iron and manganese from water is usually achieved through:
A) Chlorination
B) Aeration and oxidation
C) Ion exchange
D) Reverse osmosis
Answer: B) Aeration and oxidation
4. Q: Which process is used to oxidize and remove iron from water?
A) Reverse osmosis
B) Aeration
C) Chemical precipitation
D) Coagulation
Answer: B) Aeration
3. Fluoride and Fluoridation
5. Q: Fluoridation of drinking water helps to:
A) Remove impurities
B) Prevent dental cavities
C) Remove hardness
D) Improve taste
Answer: B) Prevent dental cavities
6. Q: Which method is used to remove fluoride from water?
A) Reverse osmosis
B) De-fluoridation
C) Chlorination
D) Filtration
Answer: B) De-fluoridation
4. Desalination
7. Q: The process of desalination is used to remove:
A) Fluoride
B) Salts from seawater
C) Iron
D) Organic compounds
Answer: B) Salts from seawater
8. Q: Reverse osmosis is used in desalination to remove:
A) Suspended solids
B) Organic compounds
C) Dissolved salts and minerals
D) Chlorine
Answer: C) Dissolved salts and minerals
5. Activated Sludge Process
9. Q: The activated sludge process is primarily used for:
A) Disinfection
B) Filtration
C) Biological treatment of wastewater
D) Hardness removal
Answer: C) Biological treatment of wastewater
10. Q: The main function of microorganisms in the activated sludge process is to:
A) Break down organic matter
B) Remove chlorine
C) Remove heavy metals
D) Remove turbidity
Answer: A) Break down organic matter
6. Corrosion Control
11. Q: The Langlier Index is used to measure the:
A) Water's hardness
B) Water's alkalinity
C) Water's corrosivity
D) Water's pH level
Answer: C) Water's corrosivity
12. Q: Which of the following is commonly used to prevent corrosion in water systems?
A) pH control
B) Chlorination
C) Chemical inhibitors
D) Coagulation
Answer: C) Chemical inhibitors
7. Ion Exchange
13. Q: The ion exchange process is mainly used for:
A) Removing suspended solids
B) Removing organic compounds
C) Softening water
D) Removing color
Answer: C) Softening water
14. Q: Which resin is used in the ion-exchange process for softening water?
A) Activated carbon
B) Zeolite
C) Polystyrene
D) Barium carbonate
Answer: B) Zeolite
8. Water Filtration
15. Q: In water filtration, sand filters are used primarily to remove:
A) Bacteria
B) Large particles and sediments
C) Organic compounds
D) Heavy metals
Answer: B) Large particles and sediments
16. Q: The primary purpose of backwashing in filtration systems is to:
A) Clean the filter media
B) Remove bacteria
C) Increase the filtration rate
D) Add chemicals to the water
Answer: A) Clean the filter media
9. Trickling Filter
17. Q: Trickling filters are used in wastewater treatment to:
A) Aerate water
B) Filter suspended solids
C) Remove biological oxygen demand (BOD)
D) Disinfect water
Answer: C) Remove biological oxygen demand (BOD)
18. Q: In trickling filters, the water is passed over a bed of:
A) Activated carbon
B) Plastic media or stones
C) Sand
D) Coarse gravel
Answer: B) Plastic media or stones
10. Biological Treatment
19. Q: Bio-towers are a type of biological treatment method that helps to:
A) Remove nutrients
B) Reduce biological oxygen demand
C) Increase turbidity
D) Disinfect water
Answer: B) Reduce biological oxygen demand
20. Q: Rotating biological contactors are used to treat wastewater by:
A) Filtration
B) Adsorption
C) Biological degradation of organic matter
D) Chemical precipitation
Answer: C) Biological degradation of organic matter
11. Color Removal
21. Q: To remove color from water, the most common method is:
A) Coagulation
B) Adsorption using activated carbon
C) Ion exchange
D) Distillation
Answer: B) Adsorption using activated carbon
22. Q: Color in water is typically caused by:
A) Dissolved minerals
B) Suspended solids
C) Organic compounds
D) Bacteria
Answer: C) Organic compounds
12. Fluoride Effects
23. Q: Excessive fluoride in drinking water can cause:
A) Dental fluorosis
B) Increased dental cavities
C) Reduced bone strength
D) Skin rashes
Answer: A) Dental fluorosis
24. Q: Fluoride concentration in drinking water is regulated at a maximum of:
A) 0.5 mg/L
B) 1.5 mg/L
C) 5.0 mg/L
D) 10 mg/L
Answer: B) 1.5 mg/L
13. Water Treatment Processes
25. Q: Which of the following is a method used for desalination of water?
A) Distillation
B) Reverse osmosis
C) Filtration
D) Ion exchange
Answer: B) Reverse osmosis
26. Q: De-fluoridation of water is typically done by:
A) Ion exchange
B) Reverse osmosis
C) Chemical precipitation
D) Activated carbon adsorption
Answer: C) Chemical precipitation
14. Water Quality Parameters
27. Q: Which of the following is a physical parameter used to assess water quality?
A) pH
B) Dissolved oxygen
C) Turbidity
D) Nitrate concentration
Answer: C) Turbidity
28. Q: The chemical oxygen demand (COD) is used to measure:
A) The amount of oxygen needed to break down organic matter in water
B) The presence of dissolved gases
C) The pH level of water
D) The quantity of suspended solids in water
Answer: A) The amount of oxygen needed to break down organic matter in water
15. Corrosion Prevention
29. Q: The primary method to prevent corrosion in water pipes is:
A) Coating the pipes with anti-corrosion materials
B) Increasing the water temperature
C) Reducing the pH
D) Using reverse osmosis
Answer: A) Coating the pipes with anti-corrosion materials
30. Q: A high Langlier index indicates:
A) High water alkalinity
B) High water corrosivity
C) Low water hardness
D) Low dissolved oxygen
Answer: B) High water corrosivity
