Time left 1 Conventional tertiary treatment is chemical coagulation and flocculation filtration sedimentation none of these 2 The maximum desirable limit Bureau of Indian Standards (BIS) of lead in the drinking water is 0.05 mg/l 0.09 mg/l 0.1 mg/l 1.0 mg/l 3 The Archaea include all of the following except methanogens halophiles thermoacidophiles cyanobacteria 4 What are Blue-Green bacteria called? Acquaobacteria Cyanobacteria Protozoa None of the above 5 The maximum desirable limit (BIS) of total hardness (as CaCo3) in drinking water is 600 ppm 300 ppm 500 ppm 1000 ppm 6 Secondary treatment uses __________ to consume wastes. micro-organisms chemicals filtration none of these 7 Acid used mostly for removal of milk stone is phosphoric acid nitric acid gluconic acid tartaric acid 8 The word cell was first used by Robert Hooke Theodor Schwann Louis Pasteur Ronald Ross
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