Question # 1

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

Ecosystem is smaller unit of

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Lithosphere

Hydroshpere

Amosphere

Biosphere

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

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5

3

4

2

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)

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

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

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100

100000

10000

10

Peroxyacetyl nitrate (PAN) is a irritant to human beings and it affects

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Eyes

Ears

Stomach

Nose

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 range of the acid rain is.

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7-6.5

6.5-6

6-6.5

Less than 5

Ecosystem is a smaller unit of

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lithospher

hydroshper

atmosphere

biosphere

In water the concentration of dissolved O₂should be

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1-3 ppm

2-4 ppm

4-8 ppm

8-12 ppm

Which is a secondary pollutant

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Carbonic acid

CO₂

SO₂

CO

In purification of potable water the coagulant used is

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Nickel sulphate

Copper sulphate

Barium sulphate

Alum

The avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water

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KMnO₄

O₃

Alums

Chloramines

Ecosystem is smaller units of.

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Lithosphere

Hydrosphere

Atmosphere

Biosphere

The avoid teh formation of toxic compounds with chlorine which substance is used for disinfecting water.

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KMnO4

O3

Alum

Chloramines

The region of earth capable of supposing life is called.

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Atmosphere

Bisphere

Dithosphere

Hydrosphere

The thickness of ozone layer is.

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25 to 50 km

25 to 28 km

3 km only

1 km only

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