Question # 1

In water the most important oxidizing agent is dissolved molecular oxygen which ranges form

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

How much pesticides have been synthesized at present?

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Four thousand

Six thousand

Eight thousand

Ten thousand

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 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

Hardness which can be removed by boiling is called

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Permanent hardness

Temporary hardness

Stiffness

Toughness

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

The pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Water exist in only

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One state

Two state

Three states

4 states

Which one of the following does not act as pollutant

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Carbon monoxide

Sulphur dioxide

Hydrocarbons

Carbon dioxide

Newspapers can be recycled again and again by how many times

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5

2

4

3

The eleventh concentration of metal cause clogs of gills in fish:

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Al

He

Pb

Ca

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

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

A single chloride free redical can destroy bow many ozene molecules?

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100

100000

10000

10

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Pathogens in raw water are killed in step:

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aeration

coagulation

chlorination

treatment

Which factor is helping to reduce the environment pollution

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rapid growth population

urbanization

idustrialization

increase of plantation

A single chloride free radical of CFCs can destroy upto ozone molecules:

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10

100

1000

100000

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

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