41. Lagoons used for purification of polluted water
42. Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?
43. Presence of __________ bacteria in water causes disease like typhoid.
44. Brown spots in fabrics will be caused by washing with water containing large amount of .
45. Soluble silica present in boiler feed water can be removed by
46. Deaeration of high pressure boiler feed water is done to reduce
47. Salt content in sea water is about __________ percent.
48. Thermal pollution due to excessive heat & temperature in the working place causes
49. Which of the following processes is involved in the biochemical treatment of sewage effluents?
50. Ionisation potential employed in the industrial electrostatic precipitator is of the order of
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