Using the activities of bacteria and other micro organisms
Aerobic oxidation
Both A & B
Neither A nor B
✅ The correct answer is option C.
Enviornmental Engineering MCQs
Aerobic biological oxidation ponds used for the purification of polluted water
Destroys/removes pathogen from the sewage
Is not very effective for nonbiodegradable substances (e.g. ABS) containing effluents
Destroys/removes pathogen much more effectively if the sewage is chlorinated
All of the above
✅ The correct answer is option D.
A man exposed to excessive noise level in the working environment may suffer from
Hearing loss
Rupture of ear drum
Nervousness & fatigue
All of the above
✅ The correct answer is option D.
Radioactive substances present in the polluted water stream can be removed by
Biological oxygen treatment
Coagulation and filtration
Adsorption in ion exchange materials
None of these
✅ The correct answer is option C.
Pick out the one which is not a chemical coagulant.
Aluminium sulphate
Ferrous sulphate
Hydrated lime
Chloramine
✅ The correct answer is option D.
Moist atmospheric air at high temperature (e.g., in summer) having high concentration of sulphur dioxide causes
Fading of dyes on textiles
Corrosion, tarnishing & soiling of metals
Reduced strength of textiles
All of the above
✅ The correct answer is option D.
Sound produced by an automobile horn heard at a distance of 1.5 metres corresponds to about __________ decibels.
90
120
150
180
✅ The correct answer is option B.
Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Hydrocarbons
Hydrogen flouride
Hydrogen sulphides
Nitrogen dioxide
✅ The correct answer is option B.
Maximum permissible limit of industrial noise as recommended by World Health Organisation (WHO) is __________ decibels.
35
75
95
105
✅ The correct answer is option B.
Which of the following is the most detrimental for water used in high pressure boiler?
Silica
Turbidity
Phenol
Dissolved oxygen
✅ The correct answer is option A.