5661. The lowest layer of atmosphere is known as the
Stratosphere
Troposphere
Ionosphere
None of these
✅ The correct answer is option B.
Chemical Engineering
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5662. Carbon monoxide is a pollutant, which causes
Respiratory disease (e.g. asthma)
Asphyxiation (suffocation) leading to death
Retardation in crop growth
Damage to building materials like marble
✅ The correct answer is option B.
5663. Lung cancer & DNA breakage are the major ill effects of excessive ozone exposure to human beings. Ozone layer depletion in the atmosphere is mainly caused by the presence of
CO₂
SO₂
Hydrocarbons
CFC (chloro fluoro carbon)
✅ The correct answer is option D.
5664. When the concentration of SO₂ in air is greater than __________ ppm, it gives a pungent smell.
0.01
0.1
1
4
✅ The correct answer is option D.
5665. Thermal pollution of water increases its toxicity and oxidation of oxygen demanding waste besides favouring bacterial growth. A rise in water temperature by 10°C, doubles the toxic effects of __________ present in it.
Coal ash
Potassium cyanide
Ortho-xylene
None of these
✅ The correct answer is option B.
5666. Pick out the wrong statement pertaining to ‘green house’ for the plants.
Green house’ (made of glass) allows visible sunlight (i.e., short wavelength solar radiation like ultra-violet rays) to pass through the glass and heat up the soil thereby warming up plants inside it
The emitted longer wavelength radiation (e.g., infrared) is partly reflected and partly absorbed by the glass of the green house
Green house effect’ in earth’s atmosphere is due to increasing CO₂ level in atmosphere. where CO₂ acts like the glass of ‘green house’ thereby warming up the earth’s surface
Green house’ is colder than the outside atmosphere
✅ The correct answer is option D.
5667. The main type of sludge gas evolved during sewage treatment in Imhoff tank is
CO₂
CH₄
CO
H₂
✅ The correct answer is option B.
5668. The average thickness of ozone layer in stratosphere is about __________ dobson unit (DU).
20
230
750
1500
✅ The correct answer is option B.
5669. Which of the following sources is responsible for maximum air pollution?
Industrial chimney exhaust
Forest fire
Automobiles exhaust
Photochemical oxidation of organic matter
✅ The correct answer is option C.
5670. Death may occur, when SO₂ concentration in atmospheric air exceeds __________ ppm.
20
100
400
200
✅ The correct answer is option C.