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Online Tests
MDCAT Chemistry Chapter 22 Online Test MCQs With Answers
Question # 1
Agriculture consumes part of fresh water:
Choose an answer
1%
2%
69%
23%
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Question # 2
A single chlorine free radical can destory how many ozone molecules
Choose an answer
10
100
1000
10000
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Question # 3
The pH of the rain water in areas where acid rain is the cause of pollution may be
Choose an answer
6.5
5.6
4.5
2.2
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Question # 4
Synthetic organic pesticides formulated nowadays are more then:
Choose an answer
One thousand
Ten thousand
Two thousands
Twenty thousand
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Question # 5
One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks
Choose an answer
Blow air
Add Na
2
CO
3
Use a specially made sorbent having fluorine trapped in it
Use a sorbent having Al
2
O
3
trapped in it
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Question # 6
Polar ice caps and glaciers consists total earth water:
Choose an answer
1%
2%
3%
4%
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Question # 7
Unit of ozone is?
Choose an answer
Debye
Dobson
Esu
Coulumb
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Question # 8
The water is considered to be polluted when the concentration of oxygen in it is
Choose an answer
6 - 9ppm
6 ppm
8 ppm
Less than 4pm
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Question # 9
Poisoning of CO can be reveresed by giving oxygen at pressure:
Choose an answer
low
least
medium
High
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Question # 10
Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:
Choose an answer
Eyes
Ears
Stomach
Nose
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Question # 11
Main cause of reducing map is:
Choose an answer
Combustion of coal
NO and NO
2
Un-burnt hydrocarbons
All of these
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Question # 12
Factors affecting quality of water:
Choose an answer
D.O
BOD
COD
a,b,c
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Question # 13
Which is not an air pollutant
Choose an answer
N
2
CO
NO
N
2
O
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Question # 14
Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic.
Choose an answer
It attaches to sulphur of the disulphide link
Hg is a heavy metal
Hg is liquid at room temperature
Hg is non reactive chemically
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Question # 15
The pH range of acid rain is?
Choose an answer
7-6.5
6.5-6
6-5.6
Less than 5
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Question # 16
Which one of the following is not air pollutant gas
Choose an answer
CO
CO
2
NO
SO
2
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Question # 17
Ozone acts as:
Choose an answer
Pollutant
saver
oxidatant
All of these
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Question # 18
Chemicals used to kill pests are:
Choose an answer
Herbicides
Insecticides
Pesticides
fungicides
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Question # 19
Solid waster of the city is disposed off by dumping in a landfill. Which of the following gas is produced in the landfill
Choose an answer
Oxygen
Chlorine
Hydrogen sulphide
Hydrogen chloride gas
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Question # 20
Fungicides are the pesticides which:
Choose an answer
Control the growth of fungus
Kills insects
Kills plants
Kill herb
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Question # 21
Term ozone hole is used for depletion of ozone during months of:
Choose an answer
Jan-Feb
March - Sep
Sep- Nov
Dec-Feb
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Question # 22
Industrial effluents have toxic synthetic organic compounds as well as heavy metals like
Choose an answer
Pb
Cr
Hg
All of these
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Question # 23
Half of the mass of atmosphere is concentrated above earth at the hieght of
Choose an answer
40 Km
25-28 Km
5-6 Km
100 Km
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Question # 24
The normal amount of overhead ozone is
Choose an answer
350 DU
450 DU
400 DU
300 DU
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Question # 25
Which of the following factors is not used to determine the quality of water
Choose an answer
COD
BOD
DO
Available chlorine
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Question # 26
Carbon Monoxide is:
Choose an answer
colouriess
orderless
high toxic
All of these
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Question # 27
Troposphere extends upto km:
Choose an answer
0-15 km
10-15 km
15-40 km
15-40 km
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Question # 28
In the atosphere, CO
2
is about
Choose an answer
0.01%
0.03%
0.05%
0.09%
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Question # 29
Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases
Choose an answer
NO
2
SO
2
Hg
Pb
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Question # 30
COD of water can be measured by
Choose an answer
Cr
2
O
3
Cr
2
O
4
-2
ions
Cr
2
O
7
-2
ions
None of these
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Question # 31
BOD is the oxygen demand with in day(s):
Choose an answer
Four
Two
Three
Five
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Question # 32
Chlorofluorocarbons and aerosols are inert in sphere:
Choose an answer
troposphere
stratosphere
lithosphere
hydrosphere
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Question # 33
The range of UV-B is:
Choose an answer
320 to 400 nm
200 to 280 nm
280 to 320 nm
50 to 400 nm
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Question # 34
Part of fresh water consumed in industry is:
Choose an answer
1%
2%
69%
23%
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