10
90
800
750
✅ The correct answer is option B.
Enviornmental Engineering MCQs
Presence of __________ hardness is responsible for the temporary hardness in water.
Carbonate
Calcium
Choride
Sulphate
✅ The correct answer is option B.
Foul odour and bad taste of water is removed by treating with
Alum
Bleaching powder
Activated carbon
Copper sulphate
✅ The correct answer is option C.
Sulphur dioxide present in the industrial chimney exhaust gases causes
Respiratory & lung disease
Reduction in plant’s productivity owing to acid rain
Corrosion of building materials
All of the above
✅ The correct answer is option D.
Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the
Forestation
Rain
Green house effect
Vegetation
✅ The correct answer is option C.
Foaming and priming in boiler operation can be reduced by reduction in __________ in feed water.
Turbidity
Color (Hazen)
Total solids
All of the above
✅ The correct answer is option D.
The weakest sound that can be heard by a person in a quiet environment is equivalent to __________ decibel.
1
5
10
20
✅ The correct answer is option A.
__________ can not control the noise pollution.
Use of silencers
Green house gases
Vibration damping
Tree plantation
✅ The correct answer is option B.
Peroxyacyl nitrate (PAN), a pollutant is found in the
Automobile exhaust
Flue gas of coal based power plant
Exhaust of nitric acid plant
Exhaust of sulphuric acid plant
✅ The correct answer is option A.
Which of the following pollutants is absent in the emissions from a fertiliser plant ?
SO₂ & SO₃
NO₂
NH₃
CO
✅ The correct answer is option D.