1. Refuse includes which of the following?
A) Only dry waste from homes
B) Only industrial waste
C) Waste material in liquid, semi-solid, or solid form from residential, industrial, and commercial areas
D) Only storm water
✅ Answer: C
2. Which of the following is NOT included in dry refuse?
A) Grass and leaves
B) Decayed vegetables
C) Discharge from urinals
D) Paper pieces
✅ Answer: C
3. Wet refuse includes:
A) Sweepings and waste cotton
B) Grass and paper
C) Discharges from latrines, urinals, and bathrooms
D) Dust and ash
✅ Answer: C
4. Sewage is primarily composed of:
A) Only industrial waste
B) Organic matter and bacteria from community waste
C) Storm water only
D) Clean water from wells
✅ Answer: B
5. The sewage that has not undergone any treatment is called:
A) Septic sewage
B) Crude or raw sewage
C) Combined sewage
D) Weak sewage
✅ Answer: B
6. The foul discharges from residential areas are referred to as:
A) Industrial sewage
B) Combined sewage
C) Sanitary sewage
D) Storm water
✅ Answer: C
7. The term 'sullage' refers to:
A) Wastewater from latrines
B) Storm water
C) Wastewater from kitchen and bathroom
D) Water from rivers
✅ Answer: C
8. What is the term used for surface run-off during rainfall?
A) Sullage
B) Storm water
C) Sub-soil water
D) Wastewater
✅ Answer: B
9. Sub soil water is:
A) Water used for irrigation
B) Rainwater collected from roofs
C) Ground water that enters the sewage line due to defects
D) Drinking water from wells
✅ Answer: C
10. Dry Weather Flow (D.W.F) includes:
A) Only domestic waste
B) Only storm water
C) Sanitary and industrial sewage
D) Flood water
✅ Answer: C
11. Which sewer carries sewage from buildings to the branch sewer?
A) Trunk sewer
B) Main sewer
C) Lateral sewer
D) Outfall sewer
✅ Answer: C
12. The lowest point inside a sewer is known as:
A) Manhole
B) Invert
C) Trunk
D) Outfall
✅ Answer: B
13. Which pipe is used to carry discharges from urinals and toilets?
A) Waste pipe
B) Soil pipe
C) Vent pipe
D) Sludge pipe
✅ Answer: B
14. The pipe meant to carry foul gases away from septic tanks is called:
A) Vent pipe
B) Soil pipe
C) Main sewer
D) Storm pipe
✅ Answer: A
15. Self-cleaning velocity refers to:
A) Speed at which water is treated
B) Velocity that prevents solid matter from settling in the sewer
C) Speed at which bacteria are killed
D) Water pressure in pipes
✅ Answer: B