Question # 1

Carbon dioxide content in atmosphere is

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0.0034%

0.034 %

0.34 %

3.4 %

In plant noise control, which of the following method is used for reducing noise

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Plant planning

Control at the source

Control of radiated noise

All above

Which of the following is not a chemical pollutant.

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Solid waste

Noiso

Insecticides

Liquid waste

Acute toxicity is expressed by the term

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LD50

IC50

I 1/2

Mean life

Which of the following substance is most abundant of all components of atmospheric air.

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O2

N2

CO2

A2

Water pollution is due to

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Agricultural discharges

Swages and other wastes

Industrial effects

All the above

Photochemical among is related to pollution of

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Air

Water

Soil

All of the above

Solar energy mainly light originates from sun due to.

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Addition relations

Displacement reactions

Thermonuclear reactions

Substitution reactions

Which of the following statement is not true with respect to hydrocarbons.

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They are gaseous and liquids

They can be saturated or unsaturated

They in air by themselves alone cause harmful effects

They form photochemical oxidants

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

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

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

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

Which of the following play significant role in depletion of ozone layer.

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of above

Which of the following is biodegradable pollutant.

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Domestic waste

DDT

Mercury salta

Aluminum foil

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

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Sulphuric acid

Nitric acid

Acetic acid

Sulphurous acid

A man has to think of alternate sources of energy due to

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Shortage of vehicles

Shortage of fossil fuels

Construction of house

Running of power plant

Which of the following process involves the use fo organic compound as an electron acceptor.

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Aerobic respiration

Anaerobic respiration

Fermentation

Glycolsis

Which of the following energy is trapped by the autotrophic organisms.

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Mechanical energy

Electrical energy

Radiant energy

Electronic energy

Which of the following statements is not related with principal requisites of water for industrial purposes.

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It should be pure and cool

It should not contain iron

It contains less quantity of line

It must be soft

Which of the following is atmospheric pollutant.

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CO2

CO

O2

N2

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