Wastewater Class 2 Multiple Choice
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the main purpose of grit removal in wastewater treatment?
A. To remove organic matter
✔✔B. To prevent equipment wear
C. To disinfect pathogens
D. To reduce BOD
Which step in wastewater treatment removes settleable solids?
A. Aeration tank
✔✔B. Primary clarifier
C. Chlorination basin
D. Trickling filter
What is the main role of aeration in activated sludge?
A. Neutralize acids
✔✔B. Provide oxygen for microorganisms
1
,C. Settle heavy particles
D. Remove grit
Which gas is primarily generated during anaerobic digestion?
A. Nitrogen
B. Oxygen
✔✔C. Methane
D. Carbon monoxide
What is the function of a bar screen?
✔✔A. Remove large debris
B. Disinfect wastewater
C. Reduce BOD
D. Aerate influent
What does TSS stand for?
A. Total Solids Suspended
✔✔B. Total Suspended Solids
2
,C. Total System Solids
D. Total Surface Solids
Which laboratory test measures oxygen consumed by microorganisms?
A. TSS test
✔✔B. BOD test
C. pH test
D. Conductivity test
Which device measures dissolved oxygen in wastewater?
A. Turbidimeter
✔✔B. DO probe
C. Chlorine analyzer
D. Pressure gauge
What is the purpose of a trickling filter?
A. Remove grit
✔✔B. Biologically treat wastewater
3
, C. Neutralize pH
D. Separate sludge
Which chemical is most commonly used for disinfection in wastewater plants?
A. Fluoride
✔✔B. Chlorine
C. Sodium bicarbonate
D. Ferric chloride
Sludge thickening is primarily used to:
A. Kill pathogens
✔✔B. Reduce water content
C. Remove grit
D. Adjust pH
The activated sludge process uses:
A. Anaerobic microorganisms
✔✔B. Aerobic microorganisms
4
Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the main purpose of grit removal in wastewater treatment?
A. To remove organic matter
✔✔B. To prevent equipment wear
C. To disinfect pathogens
D. To reduce BOD
Which step in wastewater treatment removes settleable solids?
A. Aeration tank
✔✔B. Primary clarifier
C. Chlorination basin
D. Trickling filter
What is the main role of aeration in activated sludge?
A. Neutralize acids
✔✔B. Provide oxygen for microorganisms
1
,C. Settle heavy particles
D. Remove grit
Which gas is primarily generated during anaerobic digestion?
A. Nitrogen
B. Oxygen
✔✔C. Methane
D. Carbon monoxide
What is the function of a bar screen?
✔✔A. Remove large debris
B. Disinfect wastewater
C. Reduce BOD
D. Aerate influent
What does TSS stand for?
A. Total Solids Suspended
✔✔B. Total Suspended Solids
2
,C. Total System Solids
D. Total Surface Solids
Which laboratory test measures oxygen consumed by microorganisms?
A. TSS test
✔✔B. BOD test
C. pH test
D. Conductivity test
Which device measures dissolved oxygen in wastewater?
A. Turbidimeter
✔✔B. DO probe
C. Chlorine analyzer
D. Pressure gauge
What is the purpose of a trickling filter?
A. Remove grit
✔✔B. Biologically treat wastewater
3
, C. Neutralize pH
D. Separate sludge
Which chemical is most commonly used for disinfection in wastewater plants?
A. Fluoride
✔✔B. Chlorine
C. Sodium bicarbonate
D. Ferric chloride
Sludge thickening is primarily used to:
A. Kill pathogens
✔✔B. Reduce water content
C. Remove grit
D. Adjust pH
The activated sludge process uses:
A. Anaerobic microorganisms
✔✔B. Aerobic microorganisms
4
