1. What is sewage?

• Wastewater from homes, industries, and hospitals
• Clean water from rivers
• Drinking water
• Rainwater only

2. Which of the following is not a source of wastewater?

• Homes
• Hospitals
• Agriculture
• Sunlight

3. Which system carries wastewater from homes to sewage treatment plants?

• Rainwater harvesting system
• Drainage system
• Water supply system
• Electric grid

4. What are open drains a major cause of?

• Increased groundwater
• Better hygiene
• Spreading of diseases
• Fresh air

5. Which term is used for water that has been used in homes, industries, etc.?

• Distilled water
• Rainwater
• Wastewater
• Potable water

6. What is the function of bar screens in a wastewater treatment plant?

• To remove sand and gravel
• To kill germs
• To remove large solid objects
• To pump the water

7. Grit and sand are removed in which part of the treatment process?

• Sedimentation tank
• Bar screen chamber
• Grit and sand removal tank
• Chlorination tank

8. Which process removes suspended solids by settling them down?

• Filtration
• Aeration
• Sedimentation
• Evaporation

9. What happens in the aeration tank?

• Bacteria are removed
• Chlorine is added
• Air is pumped to help microbes grow
• Water is frozen

10. What is sludge?

• Floating materials
• Solid waste collected at bottom
• Clean water
• Chemicals used in treatment

11. The treated water released from a sewage treatment plant is called:

• Sludge
• Effluent
• Raw sewage
• Grit

12. What is biogas?

• Gas used in balloons
• Gas produced by sewage treatment
• Gas used in fridges
• Harmful air pollution

13. Which microorganisms are involved in the treatment of sewage?

• Algae
• Protozoa
• Bacteria
• All of these

14. What is the best way to avoid sewage pollution?

• Use more water
• Avoid treating sewage
• Proper sewage disposal and treatment
• Block the drains

15. Contaminated water causes which of the following diseases?

• Typhoid
• Malaria
• Cold
• Asthma

16. Which method is used to disinfect the treated water?

• Boiling
• Chlorination
• Freezing
• Fermentation

17. Which of these should not be thrown into drains?

• Cooking oil
• Soap water
• Toilet cleaner
• All of the above

18. What happens when cooking oil is poured into drains?

• It evaporates
• It flows easily
• It can block the pipes
• It dissolves in water

19. Which one of the following is a low-cost on-site sewage disposal system?

• Septic tank
• Treatment plant
• Chemical toilets
• Incinerators

20. Which of these can be recycled from sewage treatment?

• Water
• Gas
• Sludge
• All of the above

21. What should be done to keep our environment free from wastewater pollution? (21)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

22. What should be done to keep our environment free from wastewater pollution? (22)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

23. What should be done to keep our environment free from wastewater pollution? (23)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

24. What should be done to keep our environment free from wastewater pollution? (24)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

25. What should be done to keep our environment free from wastewater pollution? (25)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

26. What should be done to keep our environment free from wastewater pollution? (26)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

27. What should be done to keep our environment free from wastewater pollution? (27)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

28. What should be done to keep our environment free from wastewater pollution? (28)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

29. What should be done to keep our environment free from wastewater pollution? (29)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

30. What should be done to keep our environment free from wastewater pollution? (30)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

31. What should be done to keep our environment free from wastewater pollution? (31)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

32. What should be done to keep our environment free from wastewater pollution? (32)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

33. What should be done to keep our environment free from wastewater pollution? (33)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

34. What should be done to keep our environment free from wastewater pollution? (34)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

35. What should be done to keep our environment free from wastewater pollution? (35)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

36. What should be done to keep our environment free from wastewater pollution? (36)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

37. What should be done to keep our environment free from wastewater pollution? (37)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

38. What should be done to keep our environment free from wastewater pollution? (38)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

39. What should be done to keep our environment free from wastewater pollution? (39)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only

40. What should be done to keep our environment free from wastewater pollution? (40)

• Treat sewage properly
• Discharge sewage into rivers
• Avoid toilets
• Use chemical detergents only