Question # 1

Ozone is produced in regions:

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tropical

Polor

antaric

equator

Which of the following is not the required condition for the formation of smog

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Sufficient NO

Sunlight

Less movement of air

Winds

What is component of environment?

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Atmosphere

Hydrosphere

Lithosphere

All of these

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

The overall effect of the photochemical smog in the after noon is built up of

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Neutralization

oxidizing agent

Reducing agent

Activating agent

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

Which one is more toxic?

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Fe

C

Hg

Ag

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

Water which forms scum with soap is called

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Hard water

Soft water

Distilled water

Un distilled water

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

Elements in lithosphere exist generally as:

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metals

non-metals

metalloids

minerals

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic.

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

Surface and ground water sources are contaminated by various human activities. Which of the following is not human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Desposal of industrial effluents

Rain

When chlorofluoro carbon are subjected to U.V they form

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Cations

Aninons

Free radicals

None of these

Dissolved impurities of potable water can be separated by the process of

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reduction

Aeration

Electrolysis

Co-angulation

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