Question # 1

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

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Lead

Chromium VI

Copper

Chromium III

A single chloride free radical can destroy how many ozone molecules.

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100

100000

10000

10

The smog which have high contents of SO2 in it, is called.

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Reducing smog

Oxidizing smog

Natural smog

Neutral smog

The disease can be eradicated by using pesticides.

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Malaria

Yellow fever

Sleeping sickness

All of these

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

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

Peroxyacetyl nitrate is an irritant to humab beings and it affects

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Eyes

Ears

Stomach

Nose

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Water will be considered polluted if it has dissolved oxygen.

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3ppm

4ppm

5ppm

6 ppm

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

Photochemical smog mainly consist of

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Higher hydrocarbons

Oxidising agnts

Reducing agent

All of these

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 a smaller unit of

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lithospher

hydroshper

atmosphere

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 gas is cause of Asthma

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O₃

O₂

SO₂

CO₂

Which field produces significant amount of methane in the atmosphere

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paddy field

Cotton field

Can sugar field

Wheat field

The pH range of the acid rain is

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7-6-5

6.6-6

6-5.6

less than 5

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

The colloidal particles in raw water can be removed by

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Coagulation

Aeration

Chlorination

Hydration

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