Question # 1

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 of the following waste material is not recycled for use again

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Glasses

Paper

Plastic toys

Hides of animals

Which is not an air pollutant

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N₂

CO

NO

N₂O

Solid waster of the city is disposed off by dumping in a landfill. Which of the following gas is produced in the landfill

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Oxygen

Chlorine

Hydrogen sulphide

Hydrogen chloride gas

One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

Choose the chief air pollutant among the following which depletes ozone layer

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Carbon monoxide

Carbon dioxide

Chloroflurocarbons and nitrogen oxides

Sulphur dioxide

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Newspaper can be recycled again and again by how many times?

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2

3

4

5

An excellent source of energy without causing pollution is

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Fossil fuel

Sun

Petroleum

Nuclear reactor

a hole used to dump the municipal wastes is called:

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landfill

effluents

leachate

inclneration

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

Detergents are surfactants and they reduce the

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B.P. of water

Surface tension of water

Wetting ability of water

None of these

Chemical like Al₂(SO₄) or alum are used in purification of water druing step:

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aeration

coagulation

chlorination

treatment

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil

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by using water spray

by blowing air

by treating with EDTA and then flushing the heavy metal complex out of the soil

by adding CaO

Insoluble ferric oxide is produced in the pH range:

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1 to 8

6 to 9

3 to 13

8 to 13

How much quantity of total water is available as fresh water

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3%

1%

10%

21%

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

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