Question # 1

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

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environment

hydrosphere

pollutant

biosphere

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

How much pesticides have been synthesized at present?

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Four thousand

Six thousand

Eight thousand

Ten thousand

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

Volcanoes produce SO₂:

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47%

57%

67%

77%

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

The force which hold the atoms together to form a compound is called:

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Dispersion forces

London forces

A chemical bond

Ven der wall's forces

Water is essential for life on

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Moon

Space

Earth

Sun

Unit of ozone is?

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Debye

Dobson

Esu

Coulumb

Ozone layer is present in

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Troposphere

Stratosphere

Mesosphere

Ionosphere

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

The bonding occurs among polar covalent molecules containing H and one of the small electronegative element such as O,F or N is called:

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Ionic bonding

Metallic bonding

Bridge bonding

H-bonding

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

One of the environment problem is the formation of oil slicks when oil is spilled from tankers in sea water.

Which treatment is suitable to remove oil slicks

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blow air

add Na₂CO₃

use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

Materials suspended in water or present as colloidal form in raw water are removed by:

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aeration

coagulation

chlorination

treatment

Which one is more toxic?

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Fe

C

Hg

Ag

Which one of the following is used as coagulant for purification potable water

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Chlorofluorocarbons and aerosols are inert in sphere:

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troposphere

stratosphere

lithosphere

hydrosphere

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