Environmental Engineering Questions

• The lowest layer of atmosphere is known as the
• The progressive warming up of the earth's surface is mainly due to the
• Color test of water is done with an instrument called
• Which of the following causes death by asphyxiation, if its presence in atmospheric air exceeds maximum allowable concentration (i.e. > 50 ppm)?
• The biological decomposition of organic substances in wastes controlled conditions is called
• The permissible color for domestic water supply is __________ ppm.
• In sewage treatment, the detention period allowed for oxidation ponds ranges from __________ weeks.
• Which of the following is not a source of ozone emission in the atmosphere?
• Global warming may result in
• Which of the following is an adsorbant used for the removal of SO2 from gas/air?
• Which of the following is the most lethal water pollutant?
• High noise levels produced during operation of fans and compressors can be reduced by using
• Fine grit present in sewage is removed in the __________ during sewage treatment.
• Arsenic pollutant is not generated in____industries.
• Presence of carbon monoxide in atmosphere produced by decomposition of chlorophyl and haemoglobin breakdown of some animals, beyond TLV (>50 ppm)
• Pick out the correct statement.
• Smog is not formed due to the presence of __________ in the atmosphere.
• TLV of lead for public sewer/waste water is about __________ ppm.
• The upper layer of atmosphere is called the
• Presence of nitrates in water in excess of 50 ppm causes