chemical-engineering-environmental-engineering Related Question Answers

76. Water effluent generated in printing industry is decolourised by





77. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.





78. __________ can not control the noise pollution.





79. Ozone level is generally found to be depleted in India in the month of





80. Noise level during normal conversation among men is about __________ decibles.





81. 'Particulate' air pollutants are finely divided solids and liquids. Which of the following is not a 'particulate' ?





82. Foul odour and bad taste of water is removed by treating with





83. Presence of __________ in water stream are deleterious to aquatic life.





84. Acute danger to human life (i.e. death) exists, if the concentration of CO2 in atmospheric air exceeds __________ percent (by volume).





85. Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.





86. Noise level heard inside a bus in busy city traffic or inside a sub-way train corresponds to about __________ decibels.





87. Presence of volatile compounds like gasoline, oil, alcohol, ether etc. in municipal sewers may cause





88. Noise produced by cooling fans (employed in air cooled heat exchangers or cooling tower) is mainly caused due to the turbulence created by blade passage through air. It can be reduced by use of a slower fan





89. Presence of soluble organics in polluted water causes





90. Which of the following pollutants, if present in atmosphere is detectable by its odour ?





91. In water treatment plant, zeolite process is used to remove the __________ of water.





92. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.





93. Fresh sewage is __________ in nature.





94. In a sedimentation tank, the detention period for water ranges from __________ hours.





95. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because





96. Workers working in __________ industry are most prone to white lung cancer.





97. A standard test for determination of hardness in water is termed as __________ test.





98. TLV of lead for public sewer/waste water is about __________ ppm.





99. Presence of nitrates in water in excess of 50 ppm causes





100. In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.





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