Question # 1

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

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

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O2

SO2

CFCs

All of these

Acid rain fist of all was observed by

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Augus Smith

Robert Hook

Mosley

Watson

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

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Lead

Chromium VI

Copper

Chromium III

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 minimum temperature of troposphere is.

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-2^oC

-56^oC

-100^oC

15^oC

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

The pH range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

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

Which one of the followings is not a pollutant.

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CO2

NO2

CO

SO2

The yellowish colour in photochemical smog is due to the presence of.

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NO

NO2

SO2

CO2

Which is a secondary pollutant

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Carbonic acid

CO₂

SO₂

CO

Peroxyacetyl nitrate is an irritant to humab beings and it affects

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Eyes

Ears

Stomach

Nose

The temperature in the incineration of industrial and hazardous waste process has a range.

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900 to 1000 ^oC

250 to 500^oC

950 to 1300^oC

500 to 900^oC

Which gas is cause of Asthma

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O₃

O₂

SO₂

CO₂

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