1 |
Soil remediation means |
To make it suitable for cultivation of crops
To make it acidic
To make it alkeline
To add manure into it
|
2 |
One of the environmental problem is the formation of oil slicks when oil is spilled from tankers in sea water. Which treatment is suitable to remove oil slicks |
Blow air
Add Na<sub>2</sub>CO<sub>3</sub>
Use a specially made sorbent having flouring trapped in it
Use a sorbent having Al<sub>2</sub>O<sub>3</sub>trapped in it
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3 |
Ecology is a science of environment and deals specially with |
Stratosphere
Biosphere
Lithosphere
Hydrosphere
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4 |
Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic |
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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5 |
To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be |
Ag<sup>+</sup>
Cu<sup>2+</sup>
Al<sup>3+</sup>
Si<sup>4+</sup>
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6 |
Water which his considered to be safe for human consumption is known as |
Distilled water
Contaminated water
Potable water
Rain water
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7 |
What is the cause of water pollution |
Chemical and bacterial contents in live stock
The spilled oil in rivers and ponds
Wide spread use of pesticides
All of the above
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8 |
Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will bot cause water pollution |
Live stock waste
Agricultural pesticides
Oil breaks and spills
All of the above
|
9 |
Chlorofluorocarbon, CF2CI2, plays an effective role in removing O3(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone |
|
10 |
Which is not the condition for the formation of smog |
There must be sufficient NO gas
There must be sunlight to help photo chemical reaction to take place
Air must be blowing swiftly
There must be SO<sub>2</sub>in the air
|
11 |
Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water |
SO<sub>2</sub>
NO<sub>2</sub>
CO
A and b only
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12 |
The pH of the rain water in areas where acid rain is the cause of pollution may be |
6.5
5.6
4.5
2.2
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13 |
NO and NO2gases in atmosphere are represented by |
NO
NO<sub>4</sub>
NO<sub>x</sub>
N<sub>x</sub>O<sub>y</sub>
|
14 |
Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as |
Environment
Hydrosphere
Pollutant
Biosphere
|
15 |
The largest item which is recycled is |
Newspaper
Plastic
Aluminium
Oil
|
16 |
In water the most important oxidizing agent is dissolved molecular oxygen which ranges from |
2 - 4 ppm
4 - 6 ppm
2 - 5 ppm
4 - 8 ppm
|
17 |
The toxic organic compounds and heavy metals and metalloids results in contamination of |
Surface water
Ground water
Both surface and ground water
Neither surface nor ground waters
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18 |
Polycyolic aromatic hydrocarbons are taught to be |
Disinfectant
Carcinogenic
Helpful
Reactive
|
19 |
Which of the following human activities are contaminating surface and ground waters |
Pesticides
Septic tanks
Petroleum and natural gas production
All of these
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20 |
When chlorofluoro carbon are subjected to U.V. they form |
Cations
Anions
Free radicals
None of these
|
21 |
Ozone in most of the tropical regions acts as a pollutant and causes |
Damages to eyes
Aggravates asthma
Chest discomfort
All of these
|
22 |
The normal amount of overhead ozone is about |
250 Du
300 DU
350 DU
400 DU
|
23 |
The amount of Si in the lithosphere is about |
27.72%
30.35%
35.30%
40.21%
|
24 |
The amount of oxygen in the lithosphere is about |
35.50%
40.60%
56.60%
50.50%
|
25 |
In the atmosphere, CO2is about |
0.01%
0.03%
0.05%
0.09%
|
26 |
In the atmosphere, O2is about |
10%
15%
21%
25%
|
27 |
The film forming components of paints are |
Resins
Thinners
Pigments
Driers
|
28 |
Hydrocarbans, SO2, CO, NH3, nitrogen oxides and compounds of fluorine are called |
Primary pollutant
Secondary pollutant
Tertiary pollutant
None of these
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29 |
Chromium (VI) is highly toxic and can cause |
Blindness
Cancer
Liver problems
Blood problems
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30 |
Which gasses are produced from landfills |
NH<sub>3</sub>
H<sub>2</sub>S
N<sub>2</sub>
All of these
|