Question # 1

a hole used to dump the municipal wastes is called:

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landfill

effluents

leachate

inclneration

alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium.

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sulphates

oxides

hydroxides

chlorides

The morality of the solution containing x grams ammonium sulfate in 500cm3 of the solution is 0.6 what is x?

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39.6

40.5

42.7

45.1

Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that causes contamination in fresh water

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Rain

Live stock waste

Oil leaks and spills

Disposal of industrial effluents

The semi solid wastes in landfills is called:

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Landfill

effluents

Leachate

Incineration

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

How much quantity of water is in the domestic use

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0.08%

16%

24%

90%

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 normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Ozone is a gas having boiling point

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Unstable

High

Low

Moderate

Ozone is an allotropic form of:

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Carbon

Phosphorus

Oxygen

Sulfur

Which of the following is not the required condition for the formation of smog

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Sufficient NO

Sunlight

Less movement of air

Winds

Agriculture consumes part of fresh water:

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1%

2%

69%

23%

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

Unit of ozone is?

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Debye

Dobson

Esu

Coulumb

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Which of the following is not a secondary pollutant

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Ozone

Carbonic acid

Sulphuric acid

Carbon dioxide

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

The force which hold the atoms together to form a compound is called:

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Dispersion forces

London forces

A chemical bond

Ven der wall's forces

When chlorofluoro carbon are subjected to U.V they form

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Cations

Aninons

Free radicals

None 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

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

Which of the following factors is not used to determine the quality of water

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COD

BOD

DO

Available chlorine

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

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

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AI

Hg

As

Cr(vi)

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Exposure to CO results in

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Headche

Fatigue

Unconsciousness

All of these

The pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

Petroleum or crude oil is a complex mixture of compounds mainly:

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benzene

minerals

hydrocarbons

phenols

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

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

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

Boron, aluminium, gallium, indium and thallium belong to group lll-A of the periodic table show a decrease with increasing relative atomic mass:

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Ionic character of the compounds

The first ionization energy

The basic character of the oxides

The stability of +2 oxidation

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

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

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

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

Water is essential for life on

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Moon

Space

Earth

Sun

What is the effect of polluted air on environment

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Ozone

Acid rain

Global warming

Smog

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

Heat balance of earth is maintained by

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Atmosphere

Hydrosphere

Lithosphere

Stratosphere

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

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50%

60%

Less than 40%

More than 80%

Ecosystem is a smaller unity of

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Nydosphere

Biosphere

Lithosphere

Attmosphere

Rigid rocky crust earth upto a depth of 100 km is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

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

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

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

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

Photochemical smog consists of higher concentration of:

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Oxidants

Ozone

a & b

NO₃