Question # 1

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

SO₂produced by volcanoes is about

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75%

67%

69%

70%

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

a and b only

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

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

Chemicals used to kill pests are:

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Herbicides

Insecticides

Pesticides

fungicides

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

The pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

Electropositive character increases down the groups due to:

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Increase in atomic size of the elements

Decrease in ionization potential

Decreases in electromagnetically of the element

All the above

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Pathogens in raw water are killed in step:

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aeration

coagulation

chlorination

treatment

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

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

Water is considered pollutant when value of Do is

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6 PPM

8 PPM

03 PPM

10 PPM

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

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

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

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

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

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Four

Two

Three

Five

Ocean contains part earth's water:

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95%

96%

97%

98%

The main pollution of leather tanneries in the waste is due to the salt of

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Chromium

Copper

Chromium

Lead

Water bodies are included in:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

The layer of earth around the earth is called:

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Atmosphere

Hydrosphere

Lithosphere

Biosphere

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

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

How many times a newspaper can be recycled

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02

05

08

10

Which of spectral lines when atoms are subjected to strong electric field is called:

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Compton effect

Stark effect

Zeeman effect

Photoelectric effect

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

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

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

A single chloride free radical of CFCs can destroy upto ozone molecules:

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10

100

1000

100000

Chemical equilibrium involving reactants and products in more than one phase is called:

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Homogeneous

Heterogeneous

Dynamic

Static

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

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Water in swimming pools is purified by adding

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Sodium

Chlorine

Phosphorus

Potassium

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Suspended matter is settled in purification of water by:

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aeration

coagulation

chlorination

treatment

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

Term ozone hole is used for depletion of ozone during months of:

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg toxic

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is reactive chemically

The toxic organic compounds and heavy metals and metalloids results in contamination of

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surface water

ground water

both surface and ground water

neither surface nor ground waters

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these