21. Removal of carbon particles from air involves the principle of
22. Physico-chemical characteristics of water in water sources undergo changes due to
23. Sulphur dioxide present in the industrial chimney exhaust causes
24. Coating of solid waste with impervious material is known as
25. Taj Mahal is greatly affected due to :
26. High concentration hydrocarbon pollutants in atmospheric air causes
27. Which one is not a primary greenhouse gases in the Earth's atmosphere?
28. Which of the following is secondary air pollutant ?
29. Sullage water is –
30. The gas liberated in the Bhopal gas tragedy was:
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