Question # 1

The minimum temperature of troposphere is.

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-2^oC

-56^oC

-100^oC

15^oC

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

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Lead

Chromium VI

Copper

Chromium III

A quality of raw water is improved by

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Reduction

Aeration

Dehydration

Incineration

In water the concentration of dissolved O₂should be

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1-3 ppm

2-4 ppm

4-8 ppm

8-12 ppm

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

The normal amount of overhead ozone is.

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300 DU

350 DU

400 DU

450 DU

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

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NO

NO2

SO2

CO2

Which gas is cause of Asthma

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O₃

O₂

SO₂

CO₂

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 one is primary pollutant.

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Peroxyacetyl nitrate

Sulphuric acid

Carbonic acid

Carbon monoxide

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

Fungicides are teh pesticides which

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Control the growth of fungus

Kill insects

Kill plant

Kill herbs

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

The pH of truly acidic rain is

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7-6.8

6.5-6

6-5.6

less than 5

Ecosystem is smaller units of.

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Lithosphere

Hydrosphere

Atmosphere

Biosphere

On earth polar ice caps and glacier contains H2O

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1%

2%

3%

10%

Disinfection of water by chlorine is done by the production of.

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NH2Cl

NCl2

HOCl

NHCl2

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