Question # 1

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

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases

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NO₂

SO₂

Hg

Pb

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

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2 ppm - 6 ppm

2 ppm - 4 ppm

4 ppm - 8 ppm

2 ppm - 3 ppm

Many petroleum products are:

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coloured

colourless

testy

poisoinous

Water is purified by:

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Filtration

aeration

coagualation

All of these

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

Ecology is a science of environment and deals specially with

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stratosphere

biosphere

lithosphere

hydrosphere

Fresh water of total earth water is:

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1%

2%

3%

4%

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

Hard water can block radiators due to formation of

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Insoluble calcium and magnesium salts

Insoluble sodium salts

In soluble phosphate salts

Insoluble potassium salts

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

How much quantity of water is in the domestic use

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0.08%

16%

24%

90%

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

Which of the following substance is not present in acid rain?

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Sulphuric acid

Nitric acid

Sulphurous acid

Acetic acid

Pan is an irritant to human beings and it affects

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Eyes

Nose

Hair

Skin

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