81. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the
82. Maximum permissible turbidity in potable water is __________ ppm.
83. Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
84. Pick out the wrong statement.
85. Presence of nitrates in water in excess of 50 ppm causes
86. The resistance of water to the passage of light through it is a measure of the
87. Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
88. Very small amount of air pollutants are present in stratosphere also; though most of the atmospheric pollutants are present in the troposphere. Which of the following atmospheric pollutants does not cause the ozone layer depletion in atmosphere at tremendous rate?
89. The common pollutant generated in chlor-alkali industry and battery manufacture is
90. Oilish impurities present the effluent discharged from the electroplating industry is normally not removed by
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