Question # 1

Acid rains are produced by

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Excess NO₂and SO₂from burining fossil fuels

Excess production of NH₃by industry and coal gas

Excess release of carbon monoxide by incomplete combustion

Excess formation of CO₂by combustion and animal respiration

Burning of fossil fuels is the main source of pollution

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Nitrogen oxide

Nitric oxide

Nitrous oxide

Sulphur dioxide

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

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Paper

Plastic

Hides of animals

Glass

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

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Cations

Anions

Free radicals

None of these

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Which causes water pollution?

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Smoke/fly ash

Automobile exhausts

Aeroplnes

2,4-D and pesticides

Which of the following human activities are contaminating surface and ground waters

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Pesticides

Septic tanks

Petroleum and natural gas production

All of these

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

In water the most important oxidizing agent is dissolved molecular oxygen which ranges from

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

DDT is

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Biodegradable pollutant

Nondegradable pollutant

Not a pollutant

An antibiotic

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

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

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

The pH range of the acid rain is

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8 - 7

7 - 6.5

6.5 - 6

Less than 5

Which one is the most toxic?

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Carbon

CO

CO₂

SO₂

Which of the following is not an air

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N₂

N₂O

NO

CO

In the atmosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

Soil salinity can be measured by

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Calorimeter

Potometer

Porometer

Conducitvity meter

Increasing skin cancer and high mutation rate are due to

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Acid rain

Ozone depletion

CO pollution

CO₂Pollution

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

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10,000

20,000

100,000

50,000

In purification of potable water the coagulant used is

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Nickle sulpahte

Copper sulpahte

Barium sulpahte

Alum

Polycyolic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

To purify water which has mud dissolved in it, A substance which coagulates the suspended particles is used. The coagulant may be

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Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

Which step is unnecessary for purification of water for drinking purposes

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Aeration

Coagulation

Treatment with chlorine

Treatment with iodine

Eutrophication causes reduction in

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Dissolved hydrogen

Dissolved oxygen

Dissolved salts

All the above

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

Chief air pollutant which is likely to deplete ozone layer

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Sulphure dioxide

Carbon dioxide

Nitrogen oxides and chloro fluorocarbons

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