1. Which pump allows sewage solids to pass with liquid sewage without clogging the pump?

2. A ½ cusec pump for a lift of 10 m (including losses) should have a horsepower of about:

3. What is the specific gravity of sewage?

4. Aerobic bacteria flourish in the presence of:

5. Well-oxidized sewage will contain nitrogen, largely in the form of:

6. Well-oxidized sewage will contain sulphur, largely in the form of:

7. Gases generally evolved during aerobic decomposition of sewage are:

8. Gases generally evolved during anaerobic decomposition of sewage are:

9. Temperature variation affects which of the following?

10. Imhoff cones are used to measure:

11. The pH of fresh sewage is usually:

12. Pathogenic bacteria primarily enter wastewater from:

13. Oxygen required to oxidize biologically active and inactive organic matter is called:

14. Oxygen required to oxidize biologically active organic matter is called:

15. Minimum DO required for a river stream to avoid killing aquatic life is:

16. BOD5 represents 5-day biochemical oxygen demand at a temperature of:

17. If the depletion of oxygen is found to be 2 mg/l after incubating 3 ml of sewage diluted to 300 ml at 20°C for 5 days, then the BOD5 of the sewage would be:

18. While testing for COD, sewage organic matter is oxidized by K2Cr2O7 in the presence of:

19. Between BOD and COD, which is greater?

20. Facultative bacteria are those that can survive with or without: