Question # 1

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

The disposal of domestic refuse, commercial and industrial solid wastes are studied under the title

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Solid waste management

Waste management

Solid management

Semisolid management

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%

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

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

Fresh water of total earth water is:

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1%

2%

3%

4%

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 branch of chemistry interlinked with biology, physics, medicines, agriculture, public health and sanitary engineering etc. is:

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Biochemistry

Physical chemistry

Pharmaceutical chemistry

Environmental chemistry

Ozone is produced in regions:

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tropical

Polor

antaric

equator

Amount of ozone in atmosphere is expressed in units:

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Kilograms

cm

molarity

DU

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

Nitrogen percentage in atmosphere is:

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76%

77%

78%

79%

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

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

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 non reactive chemically

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

Three elements needed for the healthy growth of plants are

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N P K

N K C

N S P

N Ca P

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

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

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

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

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

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

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

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these

How much quantity of total water is available as fresh water

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3%

1%

10%

21%

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

Chloroform is carcinogenic:

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Heart

Lungs

Liver

Kidney

Polar ice caps can melt due to

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Acid rain

Green House Effect

Smog

Chlorofluorocarbons

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 layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

Primary pollutants are:

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oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

As the number of carbon atoms increase the number of isomers also increase. The six carbon compound hexane has as many as:

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10 isomers

3 isomers

5 isomers

6 isomers

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

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

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

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

Water cover earth surface more than:

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50%

60%

70%

80%

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

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

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50,000

10,000

20,000

None of these

Contamination of water of tanning industries is due to:

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Cr(III)

Cr(VI)

Mn(III)

Mn(VII)

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

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live stock waste

oil leaks and spills

disposal of industrial effluents

rain

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

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

Ocean contains part earth's water:

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95%

96%

97%

98%

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

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

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

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

Ozone is effectively removed by

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TNT

CFCs

PVC

CNG

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

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diffusion

convection

electrophoresis

chromatography

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

The region of earth capable of supporting life is

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

CFCs are mainly used in industries due to

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Low cost

Gaseous nature

High reactivity

Un stability

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

Water which forms scum with soap is called

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Hard water

Soft water

Distilled water

Un distilled water