Question # 1

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

Ozone acts as:

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Pollutant

saver

oxidatant

All of these

Splitting 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

Ozone layer is

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25 - 28 km high

26 - 29 km high

24 - 27 km high

20 - 28 km high

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

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Atmosphere

Lithosphere

Hydrosphere

Biosphere

Ozone is effectively removed by

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TNT

CFCs

PVC

CNG

Test of incomplete combustion of petrol in the presence of

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CO₂

SO₂

NO₂

Co

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

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

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COD

BOD

DO

Available chlorine

Major cause of SO2 on global scale is

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Volcanoes

Electric sparks

Combustion

All

Which of the following waster material is not recycled for use again

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paper

plastic

hides of animals

glass

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

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Atmosphere

Hydrosphere

Lithosphere

All of these

Synthetic organic pesticides formulated nowadays are more then:

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One thousand

Ten thousand

Two thousands

Twenty thousand

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 ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None

Ecology is a science of environment and deals specially with

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stratosphere

biosphere

lithosphere

hydrosphere

Chemicals used to kill pests are:

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Herbicides

Insecticides

Pesticides

fungicides

Why is carbon monoxide called as pollutant? The reason is that

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It combines with oxygen

It combines with haemoglobin

It inactivates glycolysis

It inactivates nerves

Acidification of soil can leach metal:

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Al

Hg

Pb

Ca

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

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

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

SO₂produced by volcanoes is about

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75%

67%

69%

70%

The Catalyst used in the contact tower for the manufacture of H₂SO₄ is easily poisoned by:

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Nitrous oxide

Nitrogen gas

Arsenic oxide

Carbon dioxide

Chemicals used to kill insects are:

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Herbicides

Insecticides

Pesticides

Fungicides

Ocean contains part earth's water:

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95%

96%

97%

98%

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

In big/metropolitan cities, atmosphere is mostly polluted due to

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

The overall effect of the photochemical smog in the after noon is built up of

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Neutralization

oxidizing agent

Reducing agent

Activating agent

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

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 gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

The normal amount of overhead ozone is

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350 DU

450 DU

400 DU

300 DU

Ozone in most of the tropical regions acts as a pollutant and cause

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damages to eyes

aggravates asthma

chest discomfort

all of these

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

Chloroform is carcinogenic:

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Heart

Lungs

Liver

Kidney

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

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AI

Hg

As

Cr(vi)

Hardness which can be removed by boiling is called

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Permanent hardness

Temporary hardness

Stiffness

Toughness

The concentration of dissolved molecular oxygen in water which acts as the most important oxidizing agent ranges from

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2 ppm - 6 ppm

2 ppm - 4 ppm

4 ppm - 8 ppm

2 ppm - 3 ppm

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

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

Leaching of nutrients is due to

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Drying of soil

Combustion of soil

Acidification of soil

Neutralization of soil

Half of the mass of atmosphere is concentrated above earth at the hieght of

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40 Km

25-28 Km

5-6 Km

100 Km

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 respiration process taking place in animals depends on a difference in

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Partial pressure

Osomotic pressure

Vapour pressure

Atomospheric pressure

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

A single chlorine free radical can destroy how many ozone molecules

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100

100000

10000

10

Air pollution causes

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Acid rain

O₃ depletion

Green House Effect

All

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

Hydrocarbons, SO₂, CO, NH₃nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

In the atosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%