Engineering :: Environmental Engineering

31.  The ratio activity of water due to Strontium can be removed by
A. Aeration B. Alum coagulation
C. Phosphate coagulation D. Lime
E. Lime - Soda solution    

32.  On board ships, the source of drinking water may be
A. Rain water B. Sea water
C. Desalted sea water D. Pumped deep sea water
E. Any of the above    

33.  Which organisms cause infections diseases?
A. Viruses B. Worms
C. Protozoa D. Fungi
E. All of the above    

34.  The water borne bacterial infections may cause
A. Typhoid fever B. Dysentery
C. Cholera D. Any of the above
E. None of the above    

35.  Mottling of teeth is associated with the presence of
A. Chloride in water B. Calcium in water
C. Sodium chloride in water D. Sulphur in water
E. Fluorides in water    

36.  The cycle of life, death and decay involving organic nitrogeneous matter is called
A. The sulphur cycle B. The nitrogen cycle
C. The carbon cycle D. The hydrological cycle
E. None of the above    

37.  The most frequent method of bacterial reproduction is by
A. Cell division B. Sexual process
C. Budding D. Colony formation
E. The formation of spores    

38.  Temporary hardness in water in caused by salts like
A. Sulphates B. Nitrates
C. Chlorides D. Carbonates
E. All of the above    

39.  Identify the incorrect statement if any Zeolite process is suitable for
A. Removing temporary hardness B. Removing permanent hardness
C. Cent percent removal of hardness D. Acidic waters
E. When zeolite becomes inactive, it may be reactivated by flushing with brine solution    

40.  Zeolite is
A. A naturally occurring salt B. Hydread silica
C. Silicon carbide D. Hydrated calcium silicate
E. Hydrated alumino-silicate    

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