Question # 1

Water pollution is due to

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Agricultural discharges

Swages and other wastes

Industrial effects

All the above

The action of all the relations of all the organism to their environment is called

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Biology

Botany

Ecology

Archiology

Which of the following techniques are used for minimizing water pollution.

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Stabilization of ecosystem

Recharge of the waste

Waste treatment

All above

Acute toxicity is expressed by the term

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LD50

IC50

I 1/2

Mean life

The expected specific waste of food industry is.

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Meats

Nuts

Fats or Oils

All above

Photochemical among is generally formed

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In early hours of winters

Around mid day in summer months

When intensity of solar radiation sis very low

When concentration of particulate matter is very low.

Which of the following gas protects us form harmful effect of uv radiation.

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SO2

NO2

CO

O3

Which of the following metal acts as pollutant.

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Hg

Pb

Zn

Ni

All above

Water is often treated with chlorine to

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Increases oxygen content

Kill germs

Cause sedimentation

Remove insoluble impurities.

Which of the following substance is not present in acid rain.

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Sulphuric acid

Nitric acid

Acetic acid

Sulphurous acid

Temporary hardness of water is due to.

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Bicarbonates of K

Bicarbonates of Na

Carbonates of Ca

Bicarbonates of Ca

Which of the following statement is not related with nitric oxide.

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It is a colorless and odourless gas

It is produced largely by fuel combustion

It is a brown pungent gas

It is oxidized to NO2

Which of the following gas form weakly acidic sulphurous acid

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SO2

SO3

NO2

NO

The most promising technique for solar production of electricity is.

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Dry cell

Battery

Solar cell

None of above

Which of the following substance has been advocated as fuel of future.

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O2

N2

H2

H2O

Burning of fossil fuels is the main sources of which of the following pollutant.

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Nitrogen oxide

Nitric oxide

Nitrous oxide

Sulphur dioxide

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

Long diseases are about four times more in urban areas as compared to rural areas. This is due to the presence of which of the following. in atmosphere.

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CO2

NO2

O2

N2

Chief source of water and soil pollution in

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Mining of ores

Thermal power plant

Agro industry

All the above

Permanent hard water is softened by addition of.

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Na2CO3

CaCO3

MgCO3

ZnCO3

Human hearing is sensitive to frequency in the range of about

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10,000 - 20,000 Hz

10 - 10,000 Hz

16- 20,000 Hz

None of the above

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