21. Presence of high concentration of ozone and smog in atmospheric air causes the
22. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause
23. Turbidity of water is an indication of the presence of
24. Pick out the wrong statement.
25. Noise level heard at a distance of about 100 metres from a jet engine with after burner is about __________ decibels.
26. Maximum allowable noise exposure limits for a man working for 8 hours a day in a noisy chemical plant is about __________ decibels.
27. The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
28. Noise emitted by a ventilation fan at a distance of 3 metres is about __________ decibels.
29. Noise level inside a jet air liner in normal flight is about __________ decibels.
30. Noise level in a quiet private business office is about __________ decibels.
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