Question # 1

The process of coagulation can remove suspended solids in raw water about

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50%

60%

Less than 40%

More than 80%

BOD is the oxygen demand with in day(s):

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Four

Two

Three

Five

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

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Glasses

Paper

Plastic toys

Hides of animals

Diseases like dysentery, typhoid and hepatitis are caused by mixing of in water:

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Live stock wastes

Oil spilage

detergents

pesticides

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

Fresh water of total earth water is:

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1%

2%

3%

4%

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

Which one is more toxic?

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Fe

C

Hg

Ag

Which one of the pollutants of automobile exhausts affects the nervous system or produces mental diseases

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NO₂

SO₂

Hg

Pb

Which is not an air pollutant

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N₂

CO

NO

N₂O

Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil

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diffusion

convection

electrophoresis

chromatography

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

Augus smith discovered in the mid of seventeenth century:

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acid

Base

Acid rain

Fertilizer

How much pesticides have been synthesized at present?

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Four thousand

Six thousand

Eight thousand

Ten thousand

BOD means

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Boron oxygen deuterium

Biochemical oxygen demand

Biochemical oxygen dissolved

Biochemical oxygen death

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

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