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PPSC Chemistry Part V Environmental Chemistry Online Test MCQs With Answers
Question # 1
Fish die in water bodies polluted by sewage due to.
Choose an answer
Pathogens
Clogging of gills by silt
Reduction in dissolved oxygen
Foul smell
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Question # 2
Which of the following substance is most abundant of all components of atmospheric air.
Choose an answer
O2
N2
CO2
A2
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Question # 3
Which of the following substance acts as gaseous pollutant.
Choose an answer
NO
NO2
CO
SO2
All above
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Question # 4
Which of the following process is not physical in nature.
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Mixing
Flocculation
Sedimentation
Activated sludge process
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Question # 5
Which of the following techniques are used for minimizing water pollution.
Choose an answer
Stabilization of ecosystem
Recharge of the waste
Waste treatment
All above
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Question # 6
The presence of which of the following in drinking water is responsible for mottling of teach.
Choose an answer
Mercury
Iodine
Chlorine
Flourine
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Question # 7
Which of the following energy is trapped by the autotrophic organisms.
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Mechanical energy
Electrical energy
Radiant energy
Electronic energy
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Question # 8
Acute toxicity is expressed by the term
Choose an answer
LD50
IC50
I 1/2
Mean life
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Question # 9
Which of the following statement is not correct with respect to hydrolytic cycle.
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Water covers about 83% of the earth's surface
Water covers about 73% of the ear5th's surface.
It is the major constituent of the lithosphere
it is essential requirement of all the organisms
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Question # 10
Photochemical smog is caused primarily by
Choose an answer
CO
CO2
NO2
O3
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Question # 11
Which of the following statement is not related with direct use of solar energy.
Choose an answer
It is used for space heating of buildings
It can be used to produce electrical power using photovoltaic cells
It can be used to produce hydrogen gas
It can be used start motor vehicle
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Question # 12
In biological ecosystem which of the following substance is used by organisms.
Choose an answer
Water
Sunlight
Minerals
All above
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Question # 13
Which of the following pollutants results from chemicals petroleum and paper industries.
Choose an answer
SO2
CO
Hydrocarbons
All above
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Question # 14
Which among the following is secondary pollutant.
Choose an answer
CO
CO2
PAN
Aerosol
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Question # 15
Ozone filters out radiation below.
Choose an answer
o
1000 A
o
2000 A
o
3000 A
o
4000 A
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Question # 16
Which of the following is renewable energy source.
Choose an answer
Moon
Wind
Sun
Ocean
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Question # 17
For an average exposure of 8 hours per day, the maximum permissible concentration limit of CO in the atmosphere is.
Choose an answer
50 ppm
500 ppm
10
3
ppm
20 ppm
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Question # 18
Which of the following is major sink for carbo monoxide.
Choose an answer
Water
Soil
Animal respiration
Salts dissolved in ocean water
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Question # 19
Water is often treated with chlorine to
Choose an answer
Increases oxygen content
Kill germs
Cause sedimentation
Remove insoluble impurities.
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Question # 20
Which of the following is biodegradable pollutant.
Choose an answer
Domestic waste
DDT
Mercury salta
Aluminum foil
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