21. __________ is removed from water by lime-soda process.
22. The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
23. A 'body' which allows the short wavelength incoming solar radiation to enter in, but does not allow long wave length outgoing infra red radiation to escape out is called the
24. Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?
25. Dust collection efficiency of a cyclone separator depends upon its
26. The biological decomposition of organic substances in wastes controlled conditions is called
27. Which of the following is not a secondary air pollutant?
28. Arsenic pollutant is not generated in____industries.
29. Presence of bacteria in potable (drinking) water causes
30. The pH value of potable water should be between
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