Question # 1

The amount of oxygen in the lithosphere is about

Choose an answer

35.50%

40.60%

46.60%

50.50%

Water is made disinfectant during purification of water to the step:

Choose an answer

aeration

coagulation

chlorination

treatment

Which is property of CO?

Choose an answer

Soluble in water

Insoluble in water

No toxic

Pole coloured

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

Choose an answer

It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

Which is not an air pollutant

Choose an answer

N₂

CO

NO

N₂O

What is the morality of a solution containing 15g of urea is 500cm³ of solution?

Choose an answer

1M

0.5M

2M

1.5M

In the atosphere, CO₂is about

Choose an answer

0.01%

0.03%

0.05%

0.09%

Which is not a component of environment?

Choose an answer

Biosphere

Lithosphere

Hydrosphere

None of these

Which of the following is a macronutrient?

Choose an answer

Boron

Iron

Copper

Carbon

Air pollution causes

Choose an answer

Acid rain

O₃ depletion

Green House Effect

All

What change in plants indicates toxic effect of SO₂

Choose an answer

Weathering of leaves

Darkening of leaves

Falling of leaves

Bleaching of leaves

Fresh water of total earth water is:

Choose an answer

1%

2%

3%

4%

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

Choose an answer

2: 1

1: 2

3: 1

4: 1

Synthetic organic pesticides formulated nowadays are more then:

Choose an answer

One thousand

Ten thousand

Two thousands

Twenty thousand

Heat balance of earth is maintained by sphere:

Choose an answer

Hydrosphere

atmosphers

lithosphere

biosphere

Detergents are surfactants and they reduce the

Choose an answer

B.P. of water

Surface tension of water

Wetting ability of water

None of these

Contamination of water of tanning industries is due to:

Choose an answer

Cr(III)

Cr(VI)

Mn(III)

Mn(VII)

Nitrogen percentage in atmosphere is:

Choose an answer

76%

77%

78%

79%

Ozone gas has boiling point:

Choose an answer

Low

High

Medium

Highest

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

Choose an answer

Pb

Cr

Hg

All of these

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

Choose an answer

Four

Two

Three

Five

Water bodies are included in:

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

All of these

Water which his considered to be safe for human consumption is known as

Choose an answer

distilled water

contaminated water

potable water

rain water

Which of following is primary pollutants

Choose an answer

N₂O

PAN

H₂SO₄

None of these

Oceans cove ____________ percent of the surface of the earth

Choose an answer

60

70

80

97

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

Choose an answer

Glasses

Paper

Plastic toys

Hides of animals

The scope of environmental chemistry is to study:

Choose an answer

Source of chemicals

Transportation of chemicals

Transportation of toxic chemical

All of these

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

Choose an answer

COD

BOD

DO

Available chlorine

Components of environment is (in km) around the earth:

Choose an answer

10 km

100 km

1000 km

1500 km

Out of total amount of water available for human use is

Choose an answer

0.30%

0.2%

40%

50%

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

Choose an answer

sulphates

oxides

hydroxides

chlorides

Which not a method for solid waste management>

Choose an answer

Landfill

Incinerating

Recycling

None of these

Depletion of ozone is more during the month:

Choose an answer

Jan-March

April-Jun

July-Aug

Sept-Nov

Leaching of nutrients is due to

Choose an answer

Drying of soil

Combustion of soil

Acidification of soil

Neutralization of soil

Contaminated soil can be cleaned by various methods. Which method is not used to clean the soil

Choose an answer

diffusion

convection

electrophoresis

chromatography

Why a C- C bond breaks by uv light

Choose an answer

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

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

Choose an answer

6 - 9ppm

6 ppm

8 ppm

Less than 4pm

A single chlorine free radical can destroy how many ozone molecules

Choose an answer

100

100000

10000

10

Which is not the affect of polluted air on environment

Choose an answer

acid rain

smog

ozone

global warming

Which is unnecessary for purification of water for drinking purposes

Choose an answer

Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Hardness which can be removed by boiling is called

Choose an answer

Permanent hardness

Temporary hardness

Stiffness

Toughness

Which one of the following does not act as pollutant

Choose an answer

Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

Exhaust fumes of cars contain which poisonous gas

Choose an answer

CH₄

C₂H₆

CO

All of these

Phenomenon of acid rains gain importance in:

Choose an answer

1930s

1940s

1950s

1960s

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

Choose an answer

50,000

10,000

20,000

None of these

BOD means

Choose an answer

Boron oxygen deuterium

Biochemical oxygen demand

Biochemical oxygen dissolved

Biochemical oxygen death

Unit of ozone is?

Choose an answer

Debye

Dobson

Esu

Coulumb

Primary pollutants are:

Choose an answer

oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

Acidification of soil can leach metal:

Choose an answer

Al

Hg

Pb

Ca

Sulphate aerosols cause severe respiratory problems particularly among

Choose an answer

Infants

Women

Young people

Old people

Ozone is usually produced in the

Choose an answer

South polar region

North pole region

Tropical region

Thermosphere zone

Factors affecting quality of water:

Choose an answer

D.O

BOD

COD

a,b,c

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

Choose an answer

damages to eyes

aggravates asthma

chest discomfort

all of these

The respiration process taking place in animals depends on a difference in

Choose an answer

Partial pressure

Osomotic pressure

Vapour pressure

Atomospheric pressure

Troposphere extends upto km:

Choose an answer

0-15 km

10-15 km

15-40 km

When chlorofluoro carbon are subjected to U.V they form

Choose an answer

Cations

Aninons

Free radicals

None of these

NO and NO₂gases in atmosphere are represented by

Choose an answer

NO

NO₄

NO_x

N_xO_y

The incineration may reduce volume of wastes upto:

Choose an answer

1/4th

1/2nd

2/3rd

3/4th

Ozone is produced in regions:

Choose an answer

tropical

Polor

antaric

equator