Question # 1

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

Water is purified by:

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Filtration

aeration

coagualation

All of these

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

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

Water exist in only

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One state

Two state

Three states

4 states

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

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

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 is not a heavy industry?

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Iron

Fertilize

Paper

None

The smog having high contents of SO₂is

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Neutral smog

Reducing smog

Oxidizing smog

Artificial smog

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

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

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

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

0.1M HCI having pH =1.0 it is about 100 time stronger than acetic acid what will be the pH of acetic acid:

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0.1

1.3

2

3

The suspended particles in the raw water can be removed by the

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Coagulation

Aeration

Hydration

Dehydration

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

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