Question # 1

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

Chemical like Al₂(SO₄) or alum are used in purification of water druing step:

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aeration

coagulation

chlorination

treatment

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

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

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

Which is not considered as pollutant

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O₃

CO₂

NO₂

SO₂

One of the environmental problem is the formation of oil slicks when oil is spilled form tankers in sea water. Which treatment is suitable to remove oil slicks

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Blow air

Add Na₂CO₃

Use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

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

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

Elements in lithosphere exist generally as:

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metals

non-metals

metalloids

minerals

Primary pollutants are:

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oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

Lithosphere extends upto kilometer of earth crust in depth:

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10 km

100 km

1000 km

10000 km

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Global warming is mainly caused by ______ radiations

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UV

I.R

gama

X-rays

Reason of pollution are:

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Population and urbanization

Transportation

Industrialization

All of these

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

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