Question # 1

Fresh water of total earth water is:

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1%

2%

3%

4%

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

Biochemical oxygen demand is the capacity of organic matter in natural water to consume oxygen

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2 days

5 days

6 days

7 days

Dissolved impurities of potable water can be separated by the process of

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reduction

Aeration

Electrolysis

Co-angulation

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

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

To purify water which has mud dissolved in it, a substance which coagulates the suspended particles is used.

The coagulant may be

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Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

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

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

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

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

Elements in lithosphere exist generally as:

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metals

non-metals

metalloids

minerals

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

Newspapers can be recycled again and again by how many times

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5

2

4

3

Which of the following substance is not present in acid rain?

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Sulphuric acid

Nitric acid

Sulphurous acid

Acetic acid

Coagulation in the purification of water is carried out by

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Alum

NiSO₄

BaSO₄

CuSO₄

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MDCAT Chemistry Chapter 21 Environmental Chemistry Online Test MCQs With Answers

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