Question # 1

For an average exposure of 8 hours per day, the maximum permissible concentration limit of CO in the atmosphere is.

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50 ppm

500 ppm

10³ ppm

20 ppm

Domestic waste mostly constitutes

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Non biodegradable pollution

Biodegradable pollution

Effluents

Air pollution

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

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Sulphuric acid

Nitric acid

Acetic acid

Sulphurous acid

Permanent hard water is softened by addition of.

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Na2CO3

CaCO3

MgCO3

ZnCO3

The most harmful components of incomplete combination are generally groped as particulate polyclic matter organic (PPOM) These materials are derivatives of .

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Benzene

Naphthalene

Benz a pyrene

None of the above

Increased asthmatic attacks in certain seasons are related to.

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Inhalation of seasonal pollens

Eating of seasonal vegetables

Low temperature

Wet and dry environment

Which is not a pollutant from the exhaust of motor.

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Hydrocarbons

Carbon monoxide

NOx

Fly ash

Which of the following statement is not related with the effect of thermal pollution.

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Decrease in BOD

Increase in BOD

Reduction in DO

Change in algal production

Ozone layer of stratosphere requires protection from indiscriminate use of.

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Fungicides, insecticides, bactericides and medicines

Aerosols and high flying jets

Atomic explosions and industrial wastes

Weather ballons

Permanent hardness of water is due to.

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Sulphate of Ca

Chloride of Ca

Sulphate of Mg

All above

Which of the following statement is not correct with respect to hydrolytic cycle.

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Water covers about 83% of the earth's surface

Water covers about 73% of the ear5th's surface.

It is the major constituent of the lithosphere

it is essential requirement of all the organisms

The splitting of H2O can be carried out through

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Photolysis

Electrolysis

Dialysis

Hydrogenation

Which of the following pollutant is not secondary pollutnat.

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SO3

NO2

SO2

Ozone

Water pollution is due to

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Agricultural discharges

Swages and other wastes

Industrial effects

All the above

Ozone hole refers to.

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Black hole

Decrease to thickness of ozone layer in stratosphere

Decrease of thickness of ozone in troposphere

Increase concentration of ozone in the atmosphere

Chlorofluorocarbon are widely used as coolants in.

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Air conditioners

Clearing solvents

Aerosol propellant's

All above

Which of the following statement is not true with respect to the role of matter undergoing decomposition.

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Decomposed matter increase soil fertility

They provide a texture which is favorable for plant growth

Organic compounds for complexes with mineral nutrients which enhance uptake by plants.

In high concentration the decomposition product may increase the photosynthesis

Which of the following is a non degradable pollutant.

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Long chain phenoiics

DDT

Mercuric salts

All above

Commercial incinerators produce.

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Smoke

CO

NOx

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 substance is released into environment in the nuclear power plants.

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Iodine -131

Argon - 41

Sr-90

Cs- 137

All above

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