A. Aerobic
B. Pathogenic
C. Anaerobic
D. Non-pathogenic
Related Mcqs:
- The type of bacteria which is active in trickling filter during biological treatment of sewage is the _____________ bacteria?
A. Anaerobic
B. Saprophytic
C. Aerobic
D. Parasitic - Bacterial aerobic oxidation of polluted water in biological oxidation ponds is done to purify it. Presence of bacteria helps in____________________?
A. Coagulation and flocculation of colloids
B. Oxidation of carbonaceous matter to CO2
C. Nitrification or oxidation of ammonia derived from breakdown of nitrogenous organic matter
to the nitrite and eventually to the nitrate
D. All A., B. and C. - Presence of bacteria in potable (drinking) water causes_________________?
A. Turbidity
B. Disease
C. Bad odour
D. Bad taste & colour - Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of_________________?
A. Ozone and iodine
B. Chlorine or its compounds
C. Ultraviolet light for irradiation of water
D. All A., B. & C. - Infective bacteria in water is killed by the _____________ process?
A. Sterilisation
B. Aeration
C. Disinfection
D. None of these - Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm) ?
A. Benzopyrene
B. Peroxyacetyl nitrate
C. Carbon monoxide
D. Sulphur dioxide - Presence of high concentration of ozone and smog in atmospheric air causes the __________________?
A. Embrittlement & decrease of folding resistance of paper
B. Cracking of rubber products
C. Fading of dye on textiles
D. Damage of electrical insulator on high tension power line - Fluorosis (a bone disease) is caused by the presence of high concentration of ____________ in atmospheric air?
A. Hydrocarbons
B. Hydrogen fluoride
C. Hydrogen sulphides
D. Nitrogen dioxide - Presence of _____________ hardness is responsible for the temporary hardness in water?
A. Carbonate
B. Calcium
C. Chloride
D. Sulphate - Inhalation of silica dust causes a disease called__________________?
A. Bronchitis
B. Silicosis
C. Pneumoconiosis
D. None of these
