Environmental Engineering Questions

• Fresh sewage is __________ in nature.
• The earth's atmosphere is an envelope of gases present upto a height of about __________ kms.
• Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas?
• A standard test for determination of hardness in water is termed as __________ test.
• Which of the following is not a weightless pollutant?
• Aerosols present in atmospheric air may be
• Phenolic water generated in coke ovens & by-product plant of a steel plant are disposed off by
• For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.
• In a sedimentation tank, the detention period for water ranges from __________ hours.
• The maximum permissible noise level to which a man working in a chemical plant can be exposed for eight hours per day is about __________ decibels.
• Noise pollution level in a chemical plant is expressed in
• Ozone is
• The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the
• Pick out the wrong statement
• As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m3.(μg-microgram)
• In water treatment plant, zeolite process is used to remove the __________ of water.
• The Killer gas which caused Bhopal gas tragedy in 1984 was
• Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is
• Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
• Ethanolamine is an absorbant used for the removal of __________ from air/gas.