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MDCAT Chemistry Chapter 22 Online Test MCQs With Answers
Question # 1
a hole used to dump the municipal wastes is called:
Choose an answer
landfill
effluents
leachate
inclneration
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Question # 2
Newspapers can be recycled again and again by how many times
Choose an answer
5
2
4
3
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Question # 3
The process of coagulation can remove suspended solids in raw water about
Choose an answer
50%
60%
Less than 40%
More than 80%
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Question # 4
Hydrosphere includes
Choose an answer
Seas and rivers
Ocean & polar ice caps
Ground water
All of above
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Question # 5
Factors affecting quality of water:
Choose an answer
D.O
BOD
COD
a,b,c
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Question # 6
Ozone is a gas having boiling point
Choose an answer
Unstable
High
Low
Moderate
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Question # 7
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 # 8
Chemicals used to kill pests are:
Choose an answer
Herbicides
Insecticides
Pesticides
fungicides
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Question # 9
The incineration may reduce volume of wastes upto:
Choose an answer
1/4th
1/2nd
2/3rd
3/4th
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Question # 10
The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from
Choose an answer
2 ppm - 6 ppm
2 ppm - 4 ppm
4 ppm - 8 ppm
2 ppm - 3 ppm
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Question # 11
Ecosystem is a smaller unit of
Choose an answer
Hydrosphere
Lithosphere
Biosphere
Atmosphere
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Question # 12
Components of environment is (in km) around the earth:
Choose an answer
10 km
100 km
1000 km
1500 km
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Question # 13
The morality of the solution containing x grams ammonium sulfate in 500cm3 of the solution is 0.6 what is x?
Choose an answer
39.6
40.5
42.7
45.1
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Question # 14
The bonding occurs among polar covalent molecules containing H and one of the small electronegative element such as O,F or N is called:
Choose an answer
Ionic bonding
Metallic bonding
Bridge bonding
H-bonding
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Question # 15
A single chloride free radical of CFCs can destroy upto ozone molecules:
Choose an answer
10
100
1000
100000
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Question # 16
Men residence time of methane in atmosphere in years is:
Choose an answer
1-7
2-7
3-7
4-7
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Question # 17
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 # 18
Ozone is most of the tropical regions acts as a pollutant and causes
Choose an answer
Damages to eyes
Aggravates asthma
Chest discomfort
All of these
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Question # 19
White marble buildings are effected by?
Choose an answer
O
2
SO
2
CI
2
CFC
s
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Question # 20
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 # 21
The most important pesticides are:
Choose an answer
Herbicides
Insecticides
Fungicides
All
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Question # 22
Troposphere extends upto km:
Choose an answer
0-15 km
10-15 km
15-40 km
15-40 km
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Question # 23
The toxic organic compounds and heavy metals and metalloids results in contamination of
Choose an answer
surface water
ground water
both surface and ground water
neither surface nor ground waters
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Question # 24
Exposure to CO results in
Choose an answer
Headche
Fatigue
Unconsciousness
All of these
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Question # 25
Water is made disinfectant during purification of water to the step:
Choose an answer
aeration
coagulation
chlorination
treatment
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Question # 26
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 # 27
Which of the following human activities are contaminating surface and ground waters?
Choose an answer
pesticides
septic ranks
petroleum and natural gas production
all of these
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Question # 28
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 # 29
Requirement of macronutrient per acre of the land is
Choose an answer
5 to 200 kg
20-200 kg
200-400 kg
30-400 kg
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Question # 30
Alkali metals react viotlently with halogens:
Choose an answer
Halides
Anhydrides
Hydrides
None of the above
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Question # 31
Leather tanneries use big auantities of:
Choose an answer
Cr Vi salts
Cr III salts
Mn-salts
Pb-salts
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Question # 32
Leachate contains:
Choose an answer
fatty acids
Bacteria
Heavy metals
All of these
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Question # 33
The pH rain of acid rain is
Choose an answer
8 - 7
7 - 6.5
6.5 - 6
less than 5
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Question # 34
99.5% mass of lithosphere is made of
Choose an answer
03 elements
8 elements
11 elements
15 elements
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Question # 35
Addition of washing soda removes
Choose an answer
Softness of water
Temporary hardness of water
Permanent hardness of water
Hydrogen from water
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Question # 36
Contamination of water of tanning industries is due to:
Choose an answer
Cr(III)
Cr(VI)
Mn(III)
Mn(VII)
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Question # 37
Proxy acetyl nitrate (PAN) is an irritant to human beings and it affect
Choose an answer
Nose
Stomach
Eyes
Ears
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Question # 38
Chlorofluorocarbons and aerosols are inert in sphere:
Choose an answer
troposphere
stratosphere
lithosphere
hydrosphere
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Question # 39
Coal contains percentage of sulphur:
Choose an answer
1-9%
5-9%
6-9%
7-9%
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Question # 40
CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy
Choose an answer
10,000
20,000
100,000
50,000
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Question # 41
Atmosphere consists of gasses:
Choose an answer
N
2
O
2
Ar
All
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Question # 42
NO and NO
2
gases in atmosphere are represented by
Choose an answer
NO
NO
4
NO
x
N
x
O
y
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Question # 43
Which one of the following is an organic compound?
Choose an answer
Calcium carbide
Calcium cyanide
Carbon disulphide
None of these
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Question # 44
Which of the following air pollutant is called quiet killer
Choose an answer
PAN
CO
NO
3
SO
3
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Question # 45
Augus smith discovered in the mid of seventeenth century:
Choose an answer
acid
Base
Acid rain
Fertilizer
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Question # 46
As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:
Choose an answer
10 isomers
3 isomers
5 isomers
6 isomers
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Question # 47
The normal amount of overhead ozone is
Choose an answer
350 DU
450 DU
400 DU
300 DU
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Question # 48
One of the environment problem is the formation of oil slicks when oil is spilled from 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 # 49
Commonly used coagulants are ions of:
Choose an answer
Ferrous
Al
Cr
Ferric
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Question # 50
Petroleum or crude oil is a complex mixture of compounds mainly:
Choose an answer
benzene
minerals
hydrocarbons
phenols
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Question # 51
Chromium (VI) is highly toxic and can cause
Choose an answer
Blindness
Cancer
Liver problems
Blood problems
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Question # 52
Detergents are surfactants and they reduce the
Choose an answer
B.P. of water
Surface tension of water
Wetting ability of water
None of these
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Question # 53
Water which forms scum with soap is called
Choose an answer
Hard water
Soft water
Distilled water
Un distilled water
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Question # 54
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 # 55
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 # 56
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 reactive chemically
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Question # 57
A single chloride free redical can destroy bow many ozene molecules?
Choose an answer
100
100000
10000
10
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Question # 58
Exhaust fumes of cars contain which poisonous gas
Choose an answer
CH
4
C
2
H
6
CO
All of these
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Question # 59
The normal amount of overhead ozone is about in DU:
Choose an answer
150
250
350
450
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