Question # 1

Which of the following human activities are contaminating surface and ground waters

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Pesticides

Septic tanks

Petroleum and natural gas production

All of these

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

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

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

The toxic organic compounds and heavy metals and metalloids results in contamination of

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Surface water

Ground water

Both surface and ground water

Neither surface nor ground waters

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

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

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Cations

Anions

Free radicals

None of these

SO₂and NO₂produce pollution by increasing

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Alkalinity

Acidity

Neutrality

Buffer action

Eutrophication causes reduction in

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Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All the above

Potable water is considered to be

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Safe for human consumption

Not safe for human consumption

The surface water

The ground water

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

Carbon monoxide is harmful to human beings as it

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Is carcinogenic

Is antagonistic to CO₂

Has higher affinity for hemoglobin as compared to oxygen

Is destructive to O₃

Which gas is not a constituent of atmosphere

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Xe

O₃

H₂

F₂

Chief air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

Which one is the major reason for pollution in high cities?

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Fossil fuel

Acid rain

Heat dispersion

None of the above

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Domestic waste mostly constitutes

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Non-biodegradable pollution

Biodegradable pollution

Effluents

Air pollution

Shahi Qilla may be destroyed by

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Flood in Ravi

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

All the above

In the atmosphere, O₂is about

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10%

15%

21%

25%

Spraying of DDT produces pollution of

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Air

Air and water

Air and soil

Air, water and soil

Swage water is purified by

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Microorganisms

Light

Fishes

Aquatic plants

Which is not a component of environment

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Biosphere

Lithospahre

Hydrosphere

None of these

Which of the following forms a toxic substance in blood by combing with hemoglobin?

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Carbon dioxide

Carbon monoxide

Oxygen

Methane

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Ecology is a science of environment and deals specially with

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Stratosphere

Biosphere

Lithosphere

Hydrosphere

Increasing skin cancer and high mutation rate are due to

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Acid rain

Ozone depletion

CO pollution

CO₂Pollution

UV radiations bring about

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Skin cancer

Mouth cancer

Lung cancer

Liver cancer

Classical smog occurs in palces of

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Excess SO₂

Low temperature

High temperature

Excess NH₃

Environmental pollution affects

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Biotic components

Plants only

Man only

Biotic and abiotic components of environment

Chloroflurocarbon releases a chemical harmful to ozone

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Fluorine

Chlorine

Nitrogen peroxide

Sulphure dioxdie

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