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MDCAT Chemistry Chapter 22 Online Test MCQs With Answers
Question # 1
What is the cause of water pollution
Choose an answer
Chemical and bacterial constants in live stock
The spilled oil in rivers and ponds
Wide spreads used of pesticides
All of these
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Question # 2
Nitrogen in the atmosphere is:
Choose an answer
78%
21%
0.9%
0.03%
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Question # 3
The percentage of SO
2
produced by volcanoes is:
Choose an answer
47%
57%
67%
77%
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Question # 4
Chemistry related to the study of environment affected by the chemicals and pollutants is called:
Choose an answer
Biochemistry
Physically chemistry
Pharmaceutical chemistry
Environmental chemistry
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Question # 5
Oceans, rivers, streams, leaks, polar ice caps, glaciers and group water reservoirs are included in
Choose an answer
Atmosphere
Lithosphere
Hydrosphere
Biosphere
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Question # 6
How much pesticides have been synthesized at present?
Choose an answer
Four thousand
Six thousand
Eight thousand
Ten thousand
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Question # 7
SO
2
makes ___________ acid rains
Choose an answer
carbonic acid
Sulfuric
Nitric acid
All of these
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Question # 8
Chemical equilibrium involving reactants and products in more than one phase is called:
Choose an answer
Homogeneous
Heterogeneous
Dynamic
Static
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Question # 9
Synthetic organic pesticides formulated nowadays are more then:
Choose an answer
One thousand
Ten thousand
Two thousands
Twenty thousand
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Question # 10
Ozone layer is high:
Choose an answer
20-23 km
22-25 km
23-26 km
25-28 km
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Question # 11
Elements in lithosphere exist generally as:
Choose an answer
metals
non-metals
metalloids
minerals
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Question # 12
Organic pollutants in water are measured by
Choose an answer
DO
COD
Water logging
PH
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Question # 13
Which is used as a coagulant:
Choose an answer
Ferric salts
Potash alum
a and b both
Chlorine
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Question # 14
Fresh water of total earth water is:
Choose an answer
1%
2%
3%
4%
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Question # 15
In the atmosphere, O
2
is about
Choose an answer
10%
15%
21%
25%
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Question # 16
SO
2
produced by volcanoes is about
Choose an answer
75%
67%
69%
70%
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Question # 17
Chlorofluorocarbons and aerosols are inert in sphere:
Choose an answer
troposphere
stratosphere
lithosphere
hydrosphere
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Question # 18
The scope of environmental chemistry is to study:
Choose an answer
Source of chemicals
Transportation of chemicals
Transportation of toxic chemical
All of these
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Question # 19
Chemicals used to kill herbs are:
Choose an answer
Herbicides
Insecticides
Pesticides
Fungicides
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Question # 20
Which of the following waste material is not recycled for use again
Choose an answer
Glasses
Paper
Plastic toys
Hides of animals
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Question # 21
99.5% mass of lithosphere is made of
Choose an answer
03 elements
8 elements
11 elements
15 elements
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Question # 22
Petroleum or crude oil is a complex mixture of compounds mainly:
Choose an answer
benzene
minerals
hydrocarbons
phenols
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Question # 23
Diseases like dysentery, typhoid and hepatitis are caused by mixing of in water:
Choose an answer
Live stock wastes
Oil spilage
detergents
pesticides
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Question # 24
Suspended matter is settled in purification of water by:
Choose an answer
aeration
coagulation
chlorination
treatment
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Question # 25
The yellow color present in the photo chemical smog is due to presence of the
Choose an answer
Carbon dioxide
Nitrogen dioxide
Chlorine
All
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Question # 26
Which of the following is not a heavy industry?
Choose an answer
Iron
Fertilize
Paper
None
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Question # 27
Residence time of methane in the atmosphere is
Choose an answer
3 - 7 days
2 -3 days
3 - 7 years
2 - 3 years
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Question # 28
Chemicals used to kill pests are:
Choose an answer
Herbicides
Insecticides
Pesticides
fungicides
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Question # 29
Which is not the condition for the formation of smog
Choose an answer
there must be sufficient NO gas
there must be sunlight to help photo chemical reactions to take place
air must be blowing swifty
there must be SO
2
in the air
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Question # 30
Leaching of nutrients is due to
Choose an answer
Drying of soil
Combustion of soil
Acidification of soil
Neutralization of soil
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Question # 31
Natural water is
Choose an answer
Pure
Impure
Acts as solute
Distilled
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Question # 32
In water the most important oxidizing agent is dissolved molecular oxygen which ranges form
Choose an answer
2 - 4 ppm
4 - 6 ppm
2 - 5 ppm
4 - 8 ppm
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Question # 33
Poisoning of CO can be reveresed by giving oxygen at pressure:
Choose an answer
low
least
medium
High
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Question # 34
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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