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MDCAT Chemistry Chapter 22 Online Test MCQs With Answers
Question # 1
Part of fresh water consumed in industry is:
Choose an answer
1%
2%
69%
23%
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Question # 2
The layer of gases around the earth are called?
Choose an answer
Atmosphere
Hydrosphere
Lithosphere
All of these
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Question # 3
Coagulation in the purification of water is carried out by
Choose an answer
Alum
NiSO
4
BaSO
4
CuSO
4
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Question # 4
The layer of earth around the earth is called:
Choose an answer
Atmosphere
Hydrosphere
Lithosphere
Biosphere
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Question # 5
Which not a method for solid waste management>
Choose an answer
Landfill
Incinerating
Recycling
None of these
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Question # 6
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 # 7
Oxides of sulphur react in atmosphere by various reactions to form:
Choose an answer
sulphates
sulphites
sulphides
sulphate aerosols
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Question # 8
Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil
Choose an answer
diffusion
convection
electrophoresis
chromatography
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Question # 9
Chemicals used to kill pests are:
Choose an answer
Herbicides
Insecticides
Pesticides
fungicides
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Question # 10
Newspaper can be recycled again and again by how many times?
Choose an answer
2
3
4
5
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Question # 11
In incinerating the waste is burnt at
Choose an answer
1000
°C
100
°C
2000
°C
1500
°C
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Question # 12
99.5% mass of lithosphere is made of
Choose an answer
03 elements
8 elements
11 elements
15 elements
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Question # 13
Polar ice caps can melt due to
Choose an answer
Acid rain
Green House Effect
Smog
Chlorofluorocarbons
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Question # 14
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 # 15
Heat balance of earth is maintained by
Choose an answer
Atmosphere
Hydrosphere
Lithosphere
Stratosphere
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Question # 16
Ozone is produced in regions:
Choose an answer
tropical
Polor
antaric
equator
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Question # 17
CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory
Choose an answer
50,000
10,000
20,000
None of these
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Question # 18
Water exist in only
Choose an answer
One state
Two state
Three states
4 states
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Question # 19
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 # 20
The temperature in the incineration of industrial and hazardons waster process had a range
Choose an answer
950 to 1300°C
500 to 900°C
250 to 500°C
900 to 1000°C
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Question # 21
The gases in the atmosphere are essential for sustaining life on earth. Thus oxygen is required for breathing. What for is carbon dioxide required
Choose an answer
To help plant to under go photosynthesis
To destroy nitrogen oxide from the atmosphere
To help to clean the atmosphere
To help in fixing of bacteria
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Question # 22
Which of the following substance is not present in acid rain?
Choose an answer
Sulphuric acid
Nitric acid
Sulphurous acid
Acetic acid
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Question # 23
Ph of unpolluted rain water is
Choose an answer
07
Less than 6
5.6
Less than 5
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Question # 24
Which gases are produced from landfills?
Choose an answer
NH
3
H
2
S
N
2
All of these
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Question # 25
Water is essential for life on
Choose an answer
Moon
Space
Earth
Sun
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Question # 26
A single chlorine free radical can destory how many ozone molecules
Choose an answer
10
100
1000
10000
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Question # 27
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 # 28
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 # 29
Ecology is a science of environment and deals specially with
Choose an answer
stratosphere
biosphere
lithosphere
hydrosphere
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Question # 30
The normal amount of overhead ozone is about in DU:
Choose an answer
150
250
350
450
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Question # 31
A single free chlorine redical can destroy ozone molecules upto:
Choose an answer
100000
100
1000
10000
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Question # 32
The pH range of the acid rain is
Choose an answer
7 - 6.5
6.5 - 6
6 - 5.6
Less than 5
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Question # 33
Eleven elements made part of earth mass:
Choose an answer
97.5%
98.5%
99.5%
100%
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Question # 34
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 # 35
Which one of the following does not act as pollutant
Choose an answer
Carbon monoxide
Sulphur dioxide
Hydrocarbons
Carbon dioxide
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Question # 36
Detergent greatly effects the
Choose an answer
Aquatic life
Modern life
Terrestrial life
Plants life
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Question # 37
Density of water becomes maximum at
Choose an answer
10°C
4°C
5°C
12°C
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Question # 38
Exposure to CO results in
Choose an answer
Headche
Fatigue
Unconsciousness
All of these
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Question # 39
Ozone in most of the tropical regions acts as a pollutant and cause
Choose an answer
damages to eyes
aggravates asthma
chest discomfort
all of these
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Question # 40
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 # 41
During incineration temperature range of non-rotating chamber is
Choose an answer
900-1000C°
650-1100C°
950-1300C°
700-900C°
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Question # 42
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 # 43
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 # 44
Ozone is effectively removed by
Choose an answer
TNT
CFCs
PVC
CNG
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Question # 45
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 # 46
Which gas is not a constituent of atmosphere?
Choose an answer
Xe
O
3
H
2
F
2
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Question # 47
Which is not considered as pollutant
Choose an answer
O
3
CO
2
NO
2
SO
2
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Question # 48
Global warming is mainly caused by ______ radiations
Choose an answer
UV
I.R
gama
X-rays
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Question # 49
Chlorofluorocarbon, CF
2
Cl
2
, plays an effective role in removing O
3
(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone
Choose an answer
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Question # 50
Incineration is a process in which solid waste is burned at high temperature ranging from
Choose an answer
500 to 600°C
900 to 1000°C
1000 to 1100°C
600 to 700°C
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Question # 51
The temperature of in the incineration of industrial and hazardous waste process has range
Choose an answer
900 - 1000°C
250 - 500°C
950 - 1300°C
500 - 900°C
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Question # 52
Hardness which can be removed by boiling is called
Choose an answer
Permanent hardness
Temporary hardness
Stiffness
Toughness
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Question # 53
Chromium (VI) is highly toxic and can cause
Choose an answer
Blindness
Cancer
Liver problems
Blood problems
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Question # 54
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 # 55
The incineration may reduce volume of wastes upto:
Choose an answer
1/4th
1/2nd
2/3rd
3/4th
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Question # 56
Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is
Choose an answer
2: 1
1: 2
3: 1
4: 1
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Question # 57
During thunderstorms, water dissolves
Choose an answer
Dust particles
HCl
Nitric acid
Clouds
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Question # 58
Coal contains sulphur in it:
Choose an answer
1-3%
1-6%
1-9%
1-12%
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Question # 59
Pathogens in raw water are killed in step:
Choose an answer
aeration
coagulation
chlorination
treatment
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