MCQs on Reducing Water Pollution

By: Prof. Dr. Fazal Rehman | Last updated: May 29, 2025

1. : _____ is the BOD value of the domestic sewage.
(A) 166
(B) 161
(C) 160
(D) 168

2. : From the ____ non-hazardous organic wastes from the sewage is to be separated.
(A) Protozoa
(B) Bacteria
(C) Helminth
(D) Toxic industrial wastes

3. : _____ is the BOD value of industrial waste.
(A) 100
(B) 400
(C) 300
(D) 200

4. : _____ should be the BOD value for the food industry.
(A) 742
(B) 745
(C) 744
(D) 743

5. : _____is done after the primary treatment in domestic water treatment.
(A) Anaerobic process
(B) Sedimentation
(C) Aerobic process
(D) Screening

6. : _____is released in the domestic water process when air is sent during the active sludge.
(A) Carbondioxide
(B) Oxygen
(C) Nitrogen
(D) Chlorine

7. : The effluent contain___BOD in the final step of the domestic water process.
(A) 10ppm
(B) 15ppm
(C) 25ppm
(D) 20ppm

8. : ______is also known as an aerobic process.
(A) Sedimentation
(B) Sludge thickening process
(C) Activated sludge process
(D) Screening Activated sludge process

9. : ____of biodegradable water is converted into biomass by the aerobic process.
(A) 10%
(B) 30%
(C) 75%
(D) 50%

10. : The organic acid and alcohol are undergoing into___process an anaerobic treatment.
(A) Sedimentation
(B) Fermentation
(C) Catalysis
(D) Screening