0.001
0.1
1
5
✅ The correct answer is option A.
Enviornmental Engineering MCQs
Fresh domestic sewage is __________ in color.
Grey
Dark brown
Red
Black
✅ The correct answer is option A.
Oil and grease present in an emulsified state in waste water discharged from industries can be removed by
Biological oxidation
Skimming off
Settling out using chemical reagents
Chlorination
✅ The correct answer is option C.
Main pollutant present in automobile exhaust is
CO
CO₂
NO
Hydrocarbons
✅ The correct answer is option A.
BOD of raw municipal sewage may be in the range of about __________ mg/litre.
1-Feb
5-Oct
150-300
2000-3000
✅ The correct answer is option C.
Which of the following is an adsorbant for removal of nitrogen oxides from gas/air?
Active carbon
Silica gel
Bog iron (iron oxide)
Pulverised limestone
✅ The correct answer is option B.
Which is the best and the most effective method for the removal of organic contaminant present in the polluted water in very small quantity (say < 200 mg/litre)?
Lagooning
Activated carbon adsorption
Biological oxidation pond
Chemical coagulation
✅ The correct answer is option B.
Carcinogenic air pollutants cause
Bone decay
Cancer
Asphyxiation (suffocation)
Anemia
✅ The correct answer is option B.
Which is the most practical and economical method for removal of suspended solid matter from polluted water?
Sedimentation
Skimming off
Chlorination
Biological oxidation
✅ The correct answer is option A.
The Killer gas which caused Bhopal gas tragedy in 1984 was
Phosgene
Methyl iso-cynate (MIC)
Carbon monoxide
Sulphur dioxide
✅ The correct answer is option B.