91. Persons working in cement plants and limestone quarries are more prone to disease like
92. Dissolved oxygen content in river water is around __________ ppm.
93. Disinfection of water is done to destroy pathogenic bacteria and thus prevent water-borne diseases. Disinfection of water may be done by the use of
94. The permissible color for domestic water supply is __________ ppm.
95. Reingleman chart is used for the evaluation of __________ pollution.
96. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the
97. The Killer gas which caused Bhopal gas tragedy in 1984 was
98. A shallow pond in which the sewage is retained and biologically treated is called
99. From pollution control point of view, the maximum permissible concentration of sulphur dioxide in atmospheric air is about __________ ppm.
100. Noise pollution level in a chemical plant is expressed in
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