Environmental Engineering Test 1 Nddc Scholarship
Question 11
Exposure of SO2 containing chimney gases results in
(d) all (a), (b) and (c).
Exposure to SOâ‚‚-containing chimney gases leads to damage of leather/cloth, faster corrosion of metals, and longer drying/hardening time of paints.
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Question 12
Limestone powder is injected during pulverized caol burning in boilers to………. The flue gases.
(a) Reduce SOâ‚‚ contents in
Limestone powder (CaCO₃) is injected during pulverized coal burning to react with SO₂ in the flue gases, forming calcium sulphate (CaSO₄) and thereby reducing sulphur dioxide emissions.
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Question 13
In water chemical treatment plant, use of chloramines ensures.
(a) Disinfection
In water treatment, chloramines are primarily used for disinfection, providing longer-lasting protection against microbial contamination compared to chlorine alone.
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Question 14
carbon monoxide is a pollutant which cause
(b) asphyxiation leading to death.
Carbon monoxide (CO) binds with hemoglobin to form carboxyhemoglobin, reducing oxygen transport in the blood and causing asphyxiation, which can be fatal.
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Question 15
On exposure to high concentration of carbon monoxide (>2000 ppm), man dies because
(c) it forms carboxyhaemoglobin by combining with haemoglobin of blood thereby making it incapable of absorbing oxygen.
At high concentrations, carbon monoxide (CO) binds strongly with haemoglobin, preventing oxygen transport and leading to suffocation and death.
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Question 16
four major constituent of atmospheric air are
(a) nitrogen (b) argon (c) oxygen (d) carbon dioxide
Arrange them in decreasing order of their percentage in air.
A. A, C, B, D
Nitrogen (~78%) > Oxygen (~21%) > Argon (~0.93%) > Carbon dioxide (~0.04%).
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Question 17
The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called
D. both (b) and (c)
Increase in COâ‚‚ concentration traps heat, causing the greenhouse effect, which ultimately results in global warming.
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Question 18
Pick out the wrong statement pertaining to ‘green house’ for plants.
(d) ‘Green house‘ is colder than the outside atmosphere
A greenhouse is always warmer than the outside atmosphere because it traps heat inside by preventing the escape of infrared radiation.
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Question 19
A ‘body’ which allows the short wavelength incoming solar radiation to enter in but does not allow long wavelength outgoing infra red radiation to escape out id called
(b) green house
A greenhouse allows short wavelength solar radiation to enter but traps the long wavelength infrared radiation, leading to warming inside.
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Question 20
which of the following fine dust removal equipment is the most efficient?
(c) electrostatic precipitator
Electrostatic precipitators are the most efficient for fine dust removal, achieving efficiencies of over 99%, making them superior to bag filters, scrubbers, and cyclone separators for fine particulate matter.
