Question # 1

The rigid rocky part of earth crust called lithosphere extends upto a depth of:

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10 km

100 km

1000 km

1500 km

Materials suspended in water or present as colloidal form in raw water are removed by:

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aeration

coagulation

chlorination

treatment

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

The scope of environmental chemistry is to study:

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Source of chemicals

Transportation of chemicals

Transportation of toxic chemical

All of these

Water is essential for life on

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Moon

Space

Earth

Sun

Industrial effluents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

Which is not the condition for the formation of smog

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there must be sufficient NO gas

there must be sunlight to help photo chemical reactions to take place

air must be blowing swifty

there must be SO₂in the air

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

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

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

Which gases are produced from landfills?

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NH₃

H₂S

N₂

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

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

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

Chemicals used to kill pests are:

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Herbicides

Insecticides

Pesticides

fungicides

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

Oxides of sulphur react in atmosphere by various reactions to form:

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sulphates

sulphites

sulphides

sulphate aerosols

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

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

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

Synthetic organic pesticides formulated nowadays are more then:

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One thousand

Ten thousand

Two thousands

Twenty thousand

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

White marble buildings are effected by?

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O₂

SO₂

CI₂

CFC_s

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

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

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1960s

1970s

1980s

1990s

The temperature in the incineration process has a range:

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900 to 1000°C

650 to 1100°C

950 to 1300°C

500 to 900°C

Choose the correct statements

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SO₂affects the nucleus

SO₂affects plasmodesmata

SO₂affects cell wall

SO₂affects all membrane systems

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

The temperature in the incineration of industrial and hazardons waster process had a range

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

One of the environment problem is the formation of oil slicks when oil is spilled from 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

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

Requirement of macronutrient per acre of the land is

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5 to 200 kg

20-200 kg

200-400 kg

30-400 kg

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

A single chlorine free radical can destory how many ozone molecules

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10

100

1000

10000

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

To purify water which has mud dissolved in it, a substance which coagulates the suspended particles is used.

The coagulant may be

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Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

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

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

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

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paper

plastic

hides of animals

glass

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

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

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

Major cause of SO2 on global scale is

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Volcanoes

Electric sparks

Combustion

All

Hardness which can be removed by boiling is called

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Permanent hardness

Temporary hardness

Stiffness

Toughness

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

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

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Glasses

Paper

Plastic toys

Hides of animals

Which is the most toxic among the given?

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heavy metals

non-metals

Metals

Metalloids

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

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

Which of the following human activities are contaminating surface and ground waters?

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pesticides

septic ranks

petroleum and natural gas production

all of these

Which one is more toxic?

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Fe

C

Hg

Ag

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb