Question # 1

Which is not an air pollutant

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N₂

CO

NO

N₂O

Factors affecting quality of water:

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D.O

BOD

COD

a,b,c

Ozone is effectively removed by

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TNT

CFCs

PVC

CNG

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

The reason of acid rains is

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Release of CO in excess by in complete combustion

Excess release of NO₂and SO₂from buring of fossil fules

Formation of excess CO₂due to combustion and respiration

Formation of NH₃in excess from industry and coal gas

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

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2: 1

1: 2

3: 1

4: 1

Pan is an irritant to human beings and it affects

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Eyes

Nose

Hair

Skin

A large hole in the ozone layer over antarctica region was discovered in:

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1960s

1970s

1980s

1990s

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

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

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

Coagulation removes suspended particles in ran water:

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60%

70%

80%

90%

Chloroform is carcinogenic:

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Heart

Lungs

Liver

Kidney

White marble buildings are effected by?

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O₂

SO₂

CI₂

CFC_s

Which gases are produced from landfills?

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NH₃

H₂S

N₂

All of these

Which one of the following is used as coagulant for purification potable water

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

When chlorofluoro carbon are subjected to U.V they form

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Cations

Aninons

Free radicals

None of these

A pollutant affects

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Human affects

Quality of life

Functioning of ecosystem

All of these

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