31. Noise level during normal conversation among men is about __________ decibles.
32. TLV of aldrin in public water supply system is about __________ μg/litre.
33. A standard test for determination of hardness in water is termed as __________ test.
34. Waste/polluted water discharged from electroplating, blast furnace and coal mining industries contain mainly __________ substances.
35. Which of the following is the most lethal water pollutant?
36. Operating principle of cyclone separator is based on the action of __________ dust particles.
37. Black smoke coming out of the chimney of a furnace is an indication of the use of __________ in the furnace.
38. Shouting by a man at his full voice corresponds to a voice level of about __________ decibels.
39. COD of raw municipal sewage may be in the range of about __________ mg/litre.
40. BOD of raw municipal sewage may be in the range of about __________ mg/litre.
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