Question # 1

The pH range of the acid rain is

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7-6-5

6.6-6

6-5.6

less than 5

Thickness of atmosphere is about how much kilometer above the surface of warth

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100 km

1000 km

10,000 km

unlimited

Acid rain fist of all was observed by

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Augus Smith

Robert Hook

Mosley

Watson

The mean residence time of methane in atmosphere in

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1-2 years

3-4 years

3-5 years

3-7 years

Whcih water will be considered as polluted water.

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High value of COD

Low value of COD

High value of DO

Low value of BOD

Ozone depletion in stratosphere region is mainly due to the reaction of O3 with

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O2

SO2

CFCs

All of these

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

The minimum temperature of troposphere is.

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-2^oC

-56^oC

-100^oC

15^oC

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

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5

3

4

2

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

Which one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

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

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Lead

Chromium VI

Copper

Chromium III

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

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

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

How much fresh water is used for domestic purpose

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8%

23%

69%

100%

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

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