Environmental Engineering Questions

• Which of the following fine dust removal equipments is the most efficient?
• Polyvinyl chloride containers are not suitable for storing
• Hazardous/polluting chemical industries should have an 'exclusion zone' with a green belt and general public access prohibited around it, covering a radius of ____ metres.
• Threshold limit value (TLV) of CO in air is __________ ppm.
• Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
• There are thirteen metals which are treated as pollutants. Which of the following metals is not a pollutant?
• The main type of sludge gas evolved during sewage treatment in Imhoff tank is
• Corrosion in boilers can be prevented by
• Biological oxidation ponds remove organic matters present in the polluted water by
• Out of the following, TLV of __________ is the minimum (about 0.02 ppm).
• Reinglemann chart is used for the measurement of the
• Which of the following is the most active zone of atmosphere in which weathering events like rain, storm & lightning occur?
• The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
• Which of the following is not a natural source of air pollution?
• The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
• Disinfection of water is done to remove
• Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million).
• Photochemical smog is formed from automobile exhaust
• Fluorosis is caused due to the presence of excessive amount of __________ in drinking water.
• Water filtration rate in a rapid sand filter ranges from __________ kilolitres/m2/hr.