MCQs on Reducing Water Pollution

1. _____ is the BOD value of the domestic sewage.

(A) 161

(B) 166

(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) 200

(D) 300

4. _____ should be the BOD value for the food industry.

(A) 742

(B) 744

(C) 745

(D) 743

5. _____is done after the primary treatment in domestic water treatment.

(A) Anaerobic process

(B) Screening

(C) Aerobic process

(D) Sedimentation

6. _____is released in the domestic water process when air is sent during the active sludge.

(A) Nitrogen

(B) Oxygen

(C) Carbondioxide

(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) Screening Activated sludge process

(D) Activated sludge process

9. ____of biodegradable water is converted into biomass by the aerobic process.

(A) 10%

(B) 50%

(C) 75%

(D) 30%

10. The organic acid and alcohol are undergoing into___process an anaerobic treatment.

(A) Sedimentation

(B) Fermentation

(C) Catalysis

(D) Screening