Question # 1

Which is not the condition for the formation of smog

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There must be sufficient NO gas

There must be sunlight to help photo chemical reaction to take place

Air must be blowing swiftly

There must be SO₂in the air

Which causes water pollution?

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Smoke/fly ash

Automobile exhausts

Aeroplnes

2,4-D and pesticides

Phosphate pollution is caused by

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Weathering of phosphate rocks only

Agricultural fertilizers

Phosphate rocks and sewage

Sewage and agricultural fertilizers

In purification of potable water the coagulant used is

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Nickle sulpahte

Copper sulpahte

Barium sulpahte

Alum

Pollution is

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Removal of top soill

Release of toxic/undesirable materials in enevironment

Conversation of energy

All the above

Swage water is purified by

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Microorganisms

Light

Fishes

Aquatic plants

Atomospheric pollutant is

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CO₂

CO

O₂

N₂

Minamata disease is due to pollution of

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Organic waste into drinking water

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

When chlorofluoro carbon are subjected to U.V. they form

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Cations

Anions

Free radicals

None of these

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

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Live stock waste

Oil leaks and spills

Disposal of industrial effluents

Rain

The toxic organic compounds and heavy metals and metalloids results in contamination of

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Surface water

Ground water

Both surface and ground water

Neither surface nor ground waters

Which is not the affect of polluted air on environment

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Acid rain

Smog

Ozone

Global warming

Spraying of DDT produces pollution of

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Air

Air and water

Air and soil

Air, water and soil

Water pollution is mainly due to

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Sulphure dioxide

Carbon dioxide

Oxygen

Industrial discharges

Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

Automobiles

Fungicides are the pesticides which

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Control the growth of fungus

Kill insects

Kill plants

Kill herbs

Which of the following waste material is not recycled for use again

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Paper

Plastic

Hides of animals

Glass

Industrial effuents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

Environmental pollution affects

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Biotic components

Plants only

Man only

Biotic and abiotic components of environment

B.O.D is connected with

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Organic matter

Microbes

Mircrobes and organic matter

None of the above

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

Drained sewage has B.O.D

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More than that of water

Less than that of water

Equal to that of water

None of the above

The % of CO₂is the atmosphere is

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3.0%

0.03%

0.3%

0.5%

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Ozone in most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

Ozone hole refers to

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Hole in ozone layers

Reduction in thickness of ozone layer in stratosphere

Reduction of thickness of ozone in troposphere

Increase concentration of ozone

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ECAT Chemistry Chapter 27 Environmental Chemistry Online Test MCQs With Answers

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