Question # 1

The process of coagulation can remove suspended solids in raw water about

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50%

60%

Less than 40%

More than 80%

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

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2 day

6 day

5 day

7 day

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

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

Agriculture consumes part of fresh water:

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1%

2%

69%

23%

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

A chemist says that glass must be a super cooled liquid. the reason that he might have in his mind is that glass has:

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Definite shape

Definite volume

Crystalline structure

No crystalline structure

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Solid waster of the city is disposed off by dumping in a landfill. Which of the following gas is produced in the landfill

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Oxygen

Chlorine

Hydrogen sulphide

Hydrogen chloride gas

What is the cause of water pollution

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Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

The main pollutant of leather in the waste water is due to the salt of:

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Lead

Chromium (VI)

Copper

Chromium (III)

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

Suspended matter is settled in purification of water by:

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aeration

coagulation

chlorination

treatment

Ozone is most of the tropical regions acts as a pollutant and causes

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Damages to eyes

Aggravates asthma

Chest discomfort

All of these

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

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

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1960s

1970s

1980s

1990s

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

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

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

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