Q1: 1. What is the primary source of organic matter in domestic wastewater?

• A) Food waste
• B) Paper products
• C) Cleaning chemicals
• D) Plastic materials

Q2: 2. Which of the following is a common indicator of domestic wastewater pollution?

• A) pH level
• B) Nitrate concentration
• C) Biochemical oxygen demand (BOD)
• D) Ammonia content

Q3: 3. What is the typical range of BOD values in untreated domestic wastewater?

• A) 5-20 mg/L
• B) 50-100 mg/L
• C) 200-500 mg/L
• D) 1000-2000 mg/L

Q4: 4. Which of the following is a major nutrient of concern in domestic wastewater?

• A) Phosphorus
• B) Zinc
• C) Sodium
• D) Cadmium

Q5: 5. What is the primary source of nitrogen in domestic wastewater?

• A) Human waste
• B) Laundry detergents
• C) Fertilizers
• D) Shower water

Q6: 6. Which of the following is a typical range for the pH of domestic wastewater?

• A) 4-6
• B) 7-8
• C) 9-10
• D) 11-13

Q7: 7. What is the primary source of suspended solids in domestic wastewater?

• A) Soil erosion
• B) Soap scum
• C) Food particles
• D) Industrial effluents

Q8: 8. Which of the following is a common pathogen found in domestic wastewater?

• A) E. coli
• B) Salmonella
• C) Legionella
• D) Giardia

Q9: 9. What is the primary source of detergents in domestic wastewater?

• A) Dishwashing
• B) Laundry
• C) Personal hygiene
• D) Cleaning floors

Q10: 10. Which of the following is a common metal present in domestic wastewater due to plumbing materials?

• A) Iron
• B) Copper
• C) Lead
• D) Aluminum

Q11: 11. What is the primary source of oil and grease in domestic wastewater?

• A) Cooking
• B) Vehicle emissions
• C) Personal care products
• D) Industrial discharges

Q12: 12. Which of the following is a common household chemical that can be present in domestic wastewater?

• A) Chlorine
• B) Mercury
• C) Sulfuric acid
• D) Ammonium hydroxide

Q13: 13. What is the primary source of microplastics in domestic wastewater?

• A) Synthetic fibers
• B) Plastic bottles
• C) Food packaging
• D) Styrofoam containers

Q14: 14. Which of the following is a common source of pharmaceutical compounds in domestic wastewater?

• A) Over-the-counter drugs
• B) Herbal supplements
• C) Prescription medications
• D) Vitamin supplements

Q15: 15. What is the primary source of heavy metals in domestic wastewater?

• A) Paints and coatings
• B) Batteries
• C) Pesticides
• D) Plumbing materials

Q16: 16. Which of the following is a common source of endocrine-disrupting chemicals in domestic wastewater?

• A) Pesticides
• B) Plasticizers
• C) Flame retardants
• D) Solvents

Q17: 17. What is the primary source of nutrients like nitrogen and phosphorus in domestic wastewater?

• A) Fertilizers
• B) Human waste
• C) Cleaning products
• D) Shower water

Q18: 18. Which of the following is a common source of chloride in domestic wastewater?

• A) Water softeners
• B) Swimming pools
• C) Cleaning agents
• D) Personal care products

Q19: 19. What is the primary source of total dissolved solids (TDS) in domestic wastewater?

• A) Drinking water
• B) Cooking activities
• C) Cleaning agents
• D) Personal hygiene

Q20: 20. Which of the following is a common source of dyes and pigments in domestic wastewater?

• A) Food coloring
• B) Textile dyes
• C) Paints
• D) Ink cartridges

Q21: 21. What is the primary source of sulfates in domestic wastewater?

• A) Cleaning products
• B) Personal care items
• C) Water softeners
• D) Soil leaching

Q22: 22. Which of the following is a common source of volatile organic compounds (VOCs) in domestic wastewater?

• A) Paint thinners
• B) Air fresheners
• C) Perfumes
• D) Cleaning solvents

Q23: 23. What is the primary source of fluoride in domestic wastewater?

• A) Toothpaste
• B) Mouthwash
• C) Bottled water
• D) Fluoridated salt

Q24: 24. Which of the following is a common source of microorganisms like bacteria and viruses in domestic wastewater?

• A) Kitchen waste
• B) Human waste
• C) Pet waste
• D) Yard waste

Q25: 25. What is the primary source of household hazardous waste in domestic wastewater?

• A) Cleaning agents
• B) Batteries
• C) Light bulbs
• D) Paints and solvents