11. Color test of water is done with an instrument called
12. Presence of __________ in water stream are deleterious to aquatic life.
13. Which of the following is not a source of ozone emission in the atmosphere?
14. Carbon monoxide is a pollutant, which causes
15. Solid content in most of the domestic sewage is about __________ percent.
16. Which of the following pollutants, if present in atmosphere is detectable by its odour?
17. Polluted water having low BOD are most economically treated in
18. TLV of NO2 & NO exposure for the human being is 5 & 25 ppm respectively. Prolonged exposure of human being to NO2 causes
19. Iron & manganese present in the polluted water is removed by
20. Most of the atmospheric air pollutants are present in large quantity in
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