Question # 1

Suspended matter is settled in purification of water by:

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aeration

coagulation

chlorination

treatment

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

Nitrogen in the atmosphere is:

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78%

21%

0.9%

0.03%

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

Global warming is mainly caused by ______ radiations

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UV

I.R

gama

X-rays

Potable water is considered to be

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Safe for human consumption

The ground water

The surface water

Now safe for human consumption

The water is considered to be polluted when the concentration of oxygen in it is

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6 - 9ppm

6 ppm

8 ppm

Less than 4pm

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Exposure to CO results in

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Headche

Fatigue

Unconsciousness

All of these

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

Many petroleum products are:

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coloured

colourless

testy

poisoinous

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

What is the effect of polluted air on environment

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Ozone

Acid rain

Global warming

Smog

What is the cause of water pollution

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Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None of these

The eleventh concentration of metal cause clogs of gills in fish:

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Al

He

Pb

Ca

In water the most important oxidizing agent is dissolved molecular oxygen which ranges form

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

Why a C - Cl bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Which factor is helping to reduce the environment pollution

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rapid growth population

urbanization

idustrialization

increase of plantation

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

DDT is a:

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Fungicide

Insecticide

Herbicide

All

An excellent source of energy without causing pollution is

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Fossil fuel

Sun

Petroleum

Nuclear reactor

Ozone is usually produced in the

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South polar region

North pole region

Tropical region

Thermosphere zone

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen

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2 days

5 days

6 days

7 days

The bonding occurs among polar covalent molecules containing H and one of the small electronegative element such as O,F or N is called:

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Ionic bonding

Metallic bonding

Bridge bonding

H-bonding

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 pesticides have been synthesized at present?

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Four thousand

Six thousand

Eight thousand

Ten thousand

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Any substance in the environment which adversely affects the human health and natural functioning of the Ecosystem is known as

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environment

hydrosphere

pollutant

biosphere

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destroy

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10,000

20,000

100,000

50,000

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

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1960s

1970s

1980s

1990s

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

Chemistry related to the study of environment affected by the chemicals and pollutants is called:

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Biochemistry

Physically chemistry

Pharmaceutical chemistry

Environmental chemistry

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

Oceans, rivers, streams, leaks, polar ice caps, glaciers and group water reservoirs are included in

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Atmosphere

Lithosphere

Hydrosphere

Biosphere

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

Which is not an air pollutant

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N₂

CO

NO

N₂O

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

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

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

The semi solid wastes in landfills is called:

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Landfill

effluents

Leachate

Incineration

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

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Eyes

Ears

Stomach

Nose