121. Presence of dissolved impurities of __________ is responsible for the red brownish color of water.
122. Presence of __________ hardness is responsible for the temporary hardness in water.
123. Radioactive solid nuclear wastes are disposed off by
124. Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
125. Which of the following pollutants is not emitted during volcanic eruptions?
126. Coal washing waste water containing about 3% suspended solids (comprising of clay, slate, stone etc.) is treated for solid particles removal
127. Nitrogen oxides (NOx) is not produced in the __________ industry.
128. Presence of nitrogen and phosphorous in waste water discharged into lakes and ponds causes
129. Which of the following is a green house gas other than CO2?
130. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.
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