Question # 1

Water will be considered polluted if it has dissolved oxygen.

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3ppm

4ppm

5ppm

6 ppm

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Which one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

A single chloride free radical can destroy how many ozone molecules

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100

100,000

100,00

unlimited

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

The disease can be eradicated by using pesticides.

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Malaria

Yellow fever

Sleeping sickness

All of these

The news paper can be recycled again and again as many times as

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5

3

4

2

The pH of unpolluted rain water should be

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5.00

5.60

6.50

7.00

Which one of the following is secondary pollutant of atmosphere.

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CO

NO2

SO2

H2SO4

Acid rain fist of all was observed by

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Augus Smith

Robert Hook

Mosley

Watson

In water the concentration of dissolved O₂should be

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1-3 ppm

2-4 ppm

4-8 ppm

8-12 ppm

The main pollutant of leather tanneries in the waste water is due the salt of.

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Lead

Chromium (VI)

Copper

Chromium (III)

Ecosystem is smaller units of.

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Lithosphere

Hydrosphere

Atmosphere

Biosphere

Ecosystem is a smaller unit of

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lithospher

hydroshper

atmosphere

biosphere

Half mass of atmosphere gases is present in.

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5-6 km distance above the surface of earth

10 km above the surface

100 km above the surface

56 km above the surface

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