Question # 1

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

Burning of fossil fuels is the main source of pollution

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Nitrogen oxide

Nitric oxide

Nitrous oxide

Sulphur dioxide

The pH range of the acid rain is

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8 - 7

7 - 6.5

6.5 - 6

Less than 5

Result of ozone hole is

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Green house effect

Global warming

Acid rain

UV rays reach the earth

Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

Automobiles

In purification of potable water the coagulant used is

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Nickle sulpahte

Copper sulpahte

Barium sulpahte

Alum

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

Which gas is not a constituent of atmosphere

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Xe

O₃

H₂

F₂

B.O.D is connected with

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Organic matter

Microbes

Mircrobes and organic matter

None of the above

Increased asthmatic attacks in certain seasons are related to

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Inhalation of seasonal pollen

Eating of seasonal vegetables

Low temperature

Wet and dry environment

What is the cause of water pollution

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Chemical and bacterial contents in live stock

The spilled oil in rivers and ponds

Wide spread use of pesticides

All of the above

Which is not the condition for the formation of smog

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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 SO₂in the air

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

Soil salinity can be measured by

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Calorimeter

Potometer

Porometer

Conducitvity meter

When rain is accompanied by a thunderstorm, the collected rain water will have a pH value

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Uninfluenced by occurrence of thuderstorm

Which depends on the amount of dust in air

Slightly lower than that of rain water without thunderstorm

Slighlty higher than that when the thunderstom is not there

Water which his considered to be safe for human consumption is known as

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Distilled water

Contaminated water

Potable water

Rain water

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

Pollution is

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Removal of top soill

Release of toxic/undesirable materials in enevironment

Conversation of energy

All the above

Phosphate pollution is caused by

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Weathering of phosphate rocks only

Agricultural fertilizers

Phosphate rocks and sewage

Sewage and agricultural fertilizers

The % of CO₂is the atmosphere is

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3.0%

0.03%

0.3%

0.5%

UV radiations bring about

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Skin cancer

Mouth cancer

Lung cancer

Liver cancer

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Acid rains are produced by

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Excess NO₂and SO₂from burining fossil fuels

Excess production of NH₃by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂by combustion and animal respiration

Surface and ground water sources are contaminated by various human activities. Which of the followings is not a human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Disposal of industrial effluents

Rain

Drained sewage has B.O.D

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More than that of water

Less than that of water

Equal to that of water

None of the above

Chief air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

When chlorofluoro carbon are subjected to U.V. they form

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Cations

Anions

Free radicals

None of these

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

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Blow air

Add Na₂CO₃

Use a specially made sorbent having flouring trapped in it

Use a sorbent having Al₂O₃trapped in it

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