Anaerobic
Saphrophytic
Aerobic
Parasitic
✅ The correct answer is option C.
Enviornmental Engineering MCQs
Acute danger to human life (i.e. death) exists, if the concentration of CO₂ in atmospheric air exceeds __________ percent (by volume).
1
3
7
20
✅ The correct answer is option D.
Maximum permissible residual chlorine in treated water should be __________ mg/litre.
0.001 to 0.01
02 to 0.3
2 to 3
5 to 10
✅ The correct answer is option B.
Which of the following fine dust removal equipments is the most efficient?
Bag filter
Scrubber
Electrostatic precipitator
Cyclone separator
✅ The correct answer is option C.
High noise level in a chemical plant can be controlled by the
Suppression of noise at the source itself
Path control of noise
Protection of operating personnel
All of the above
✅ The correct answer is option D.
In troposphere (the weather domain), the temperature ‘t’ at height ‘h’ above the spa level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)
t = 15 – 0.0065h
t = 15 + 0.0065h
t = 0.0035h -15
t = 15 – 0.0035h
✅ The correct answer is option A.
‘Safe limit’ called Threshold Limit Value (TLV) of carbon monoxide in atmospheric air is < 50 ppm. The main source of carbon monoxide pollutant in air is the
Industrial chimney exhaust
Automobiles exhaust
Photochemical reaction in polluted atmosphere
Burning of domestic fuel
✅ The correct answer is option B.
Atmospheric pollution caused by the exhaust gas of supresonic transport air-crafts is mostly in the atmospheric region called
Thermosphere
Stratosphere
Troposphere
Mesosphere
✅ The correct answer is option B.
Threshold limit value (TLV) of CO in air is __________ ppm.
5
50
2000
5000
✅ The correct answer is option B.
The density of the gases (present in air) decreases with increasing altitude to such an extent, that about 70% of the mass of atmospheric air is found in the lower 5 km. of the atmosphere. This lower region of atmosphere is called the
Ionosphere
Troposphere
Stratosphere
None of these
✅ The correct answer is option B.