Chlorination
Treating in biological oxygen pond
Chemical coagulation
None of these
✅ The correct answer is option B.
Enviornmental Engineering MCQs
80% less than 200 mesh size particles are called
Smoke
Powder
Grit
Aggregates
✅ The correct answer is option B.
Dissolved oxygen content in river water is around __________ ppm.
5
100
250
500
✅ The correct answer is option A.
Deaeration of high pressure boiler feed water is done to reduce
Foaming from boilers
Its dissolved oxygen content
Its silica content
Caustic embrittlement
✅ The correct answer is option B.
Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in ‘gas chamber’ is about __________ ppm.
<1
10-100
100-200
100-1000
✅ The correct answer is option A.
The resistance of water to the passage of light through it is a measure of the
Turbidity
Color
Hardness
Dissolved gases
✅ The correct answer is option A.
Inhalation of silica dust by human being causes
Asphyxiation
Shortness of breath
Tuberculosis
Both B & C
✅ The correct answer is option D.
Lead exhausted in the atmosphere by automobiles using leaded petrol (i.e. tetraethyl lead for improving octane number) is a lethal air pollutant which causes
Paralysis of muscles & loss of appetite
Nervous depression
Gastritis & diarrhea
All of the above
✅ The correct answer is option D.
Hydrogen ion concentration in distilled water is
10⁻⁷
7 x 10⁻⁷
10⁷
7 x 10⁷
✅ The correct answer is option A.
Direct reaction of unsaturated hydrocarbons with either NO or NO₂ produces an eye irritating pollutant compound known as
Photochemical smog
Peroxy acetyl nitrate (PAN) or methyl nitrile
Benzopyrene
Poly acrylonitrile
✅ The correct answer is option B.