Question # 1

SO₂produced by volcanoes is about

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75%

67%

69%

70%

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Phenomenon of acid rains gain importance in:

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1930s

1940s

1950s

1960s

Which of the following is not a secondary pollutant

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Ozone

Carbonic acid

Sulphuric acid

Carbon dioxide

Electropositive character increases down the groups due to:

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Increase in atomic size of the elements

Decrease in ionization potential

Decreases in electromagnetically of the element

All the above

Which of the following air pollutant is called quiet killer

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PAN

CO

NO₃

SO₃

Water which his considered to be safe for human consumption is known as

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distilled water

contaminated water

potable water

rain water

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

Industrial effluents have toxic synthetic organic compounds as well as heavy metals like

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Pb

Cr

Hg

All of these

The toxic organic compounds and heavy metals and metalloids results in contamination of

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surface water

ground water

both surface and ground water

neither surface nor ground waters

Polycyclic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

The temperature in the incineration of industrial and hazardons waster process had a range

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

Oxides of sulphur react in atmosphere by various reactions to form:

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sulphates

sulphites

sulphides

sulphate aerosols

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

Materials suspended in water or present as colloidal form in raw water are removed by:

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aeration

coagulation

chlorination

treatment

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

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1960s

1970s

1980s

1990s

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Which of the following waster material is not recycled for use again

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paper

plastic

hides of animals

glass

Natural water is

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Pure

Impure

Acts as solute

Distilled

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

Region of earth capable of supporting life is called:

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Atmosphere

Hydrosphere

Lithosphere

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

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

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

Peroxyacetylnitrate (PAN) is an irritant to human beings and it affects:

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Eyes

Ears

Stomach

Nose

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

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

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⁺

Requirement of macronutrient per acre of the land is

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5 to 200 kg

20-200 kg

200-400 kg

30-400 kg

Ocean contains part earth's water:

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95%

96%

97%

98%

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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low value

higher value

both values

none of these

Lithosphere has amount of silicon

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35.30%

27.72%

40.01%

21.13%

Ozone in most of the tropical regions acts as a pollutant and cause

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damages to eyes

aggravates asthma

chest discomfort

all of these

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

How can heavy metal contamination like the presence of Hg or Pb may be removed from the soil

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by using water spray

by blowing air

by treating with EDTA and then flushing the heavy metal complex out of the soil

by adding CaO

Residence time of methane in the atmosphere is

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3 - 7 days

2 -3 days

3 - 7 years

2 - 3 years

Augus smith discovered in the mid of seventeenth century:

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acid

Base

Acid rain

Fertilizer

Soil remediation means

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to make it suitable for cultivation of crops

to make it acidic

to make it alkeline

to add manure into it

Half of the mass of atmosphere is concentrated above earth at the hieght of

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40 Km

25-28 Km

5-6 Km

100 Km

The bonding occurs among polar covalent molecules containing H and one of the small electronegative element such as O,F or N is called:

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Ionic bonding

Metallic bonding

Bridge bonding

H-bonding

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

Surface and ground water sources are contaminated by various human activities. Which of the following is not a human activity that causes contamination in fresh water

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Rain

Live stock waste

Oil leaks and spills

Disposal of industrial effluents

The normal amount of overhead ozone is about in DU:

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150

250

350

450

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

SO₂and NO₂cause pollution due to increase in

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Buffer action

Basicity

Acidity

Neutrality

Ozone is a gas having boiling point

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Unstable

High

Low

Moderate

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

DDT is a:

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Fungicide

Insecticide

Herbicide

All

During incineration temperature range of non-rotating chamber is

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900-1000C°

650-1100C°

950-1300C°

700-900C°

A single free chlorine redical can destroy ozone molecules upto:

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100000

100

1000

10000

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

Density of water becomes maximum at

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10°C

4°C

5°C

12°C

Amount of fresh water used by agriculture is

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2%

23%

69%

97%

The words smog is a combination of smoke and:

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fog

foke

fork

fizzy

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

Newspaper can be recycled again and again by how many times?

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2

3

4

5