Ion exchange technique
Reverse osmosis
Electrolytic decomposition
Adsorption
✅ The correct answer is option C.
Enviornmental Engineering MCQs
Ozone level is generally found to be depleted in India in the month of
February
July
April
December
✅ The correct answer is option D.
Carbonaceous particles having size less than 1 μm are called
Grit
Aggregates
Aerosols
Smoke
✅ The correct answer is option D.
Presence of nitrogen in high concentration in contaminated air reduces partial pressure of oxygen in lungs, thereby causing asphyxia (suffocation) leading to death from oxygen deficiency. Concentration of N₂ in contaminated air at which it acts as a natural asphyxant is ≥ __________ percent.
84
88
80
92
✅ The correct answer is option A.
H₂S present in gaseous stream can be removed by adsorption on
Silica gel
Active carbon
Bog iron
Limestone powder
✅ The correct answer is option C.
__________ is the process of killing organism in water.
Coagulation
Sterilisation
Disinfection
Sedimentation
✅ The correct answer is option C.
Particulates (< 1μm size) remaining suspended in air indefinitely and transported by wind currents are called
Fumes
Mists
Smoke
Aerosols
✅ The correct answer is option D.
In sewage treatment, its sedimentation is speeded up by commonly adding
Hydrochloric acid
Lime
Copper sulphate
Sodium sulphate
✅ The correct answer is option B.
Which of the following dust collection equipments is the least efficient (for sub-micronic particles)?
Dust catcher (gravity type)
Cyclone separator
Bag filter
Hollow wet scrubber
✅ The correct answer is option A.
Ozone is
A primary pollutant
A secondary pollutant
Impervious to ultra-violet rays
Both B & C
✅ The correct answer is option D.