Question # 1

BOD means

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Boron oxygen deuterium

Biochemical oxygen demand

Biochemical oxygen dissolved

Biochemical oxygen death

Which of following is primary pollutants

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N₂O

PAN

H₂SO₄

None of these

The percentage of SO₂ produced by volcanoes is:

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47%

57%

67%

77%

The amount of Si in the lithosphere is about

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27.72%

30.35%

35.30%

40.21%

COD of water can be measured by

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Cr₂O₃

Cr₂O₄^-2ions

Cr₂O₇^-2ions

None of these

Why is carbon monoxide called as pollutant? The reason is that

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It combines with oxygen

It combines with haemoglobin

It inactivates glycolysis

It inactivates nerves

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

Suspended matter is settled in purification of water by:

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aeration

coagulation

chlorination

treatment

Natural water is

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Pure

Impure

Acts as solute

Distilled

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

SO₂makes ___________ acid rains

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carbonic acid

Sulfuric

Nitric acid

All of these

Water bodies are included in:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Fungicides are the pesticides which:

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Control the growth of fungus

Kills insects

Kills plants

Kill herb

Synthetic organic pesticides formulated nowadays are more then:

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One thousand

Ten thousand

Two thousands

Twenty thousand

Depletion of ozone is more during the month:

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Jan-March

April-Jun

July-Aug

Sept-Nov

Components of environment is (in km) around the earth:

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10 km

100 km

1000 km

1500 km

Ozone is present in layer around earth:

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atmosphere

tropospher

stratosphere

thermosphere

Main cause of reducing map is:

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Combustion of coal

NO and NO₂

Un-burnt hydrocarbons

All of these

Which of the following is a macronutrient?

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Boron

Iron

Copper

Carbon

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

Chemicals used to kill insects are:

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Herbicides

Insecticides

Pesticides

Fungicides

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

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50%

60%

Less than 40%

More than 80%

The pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

Water cover earth surface more than:

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50%

60%

70%

80%

How much quantity of water is in the domestic use

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0.08%

16%

24%

90%

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

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

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

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aeration

coagulation

chlorination

treatment

Which is not a component of environment?

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Biosphere

Lithosphere

Hydrosphere

None of these

Which is property of CO?

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Soluble in water

Insoluble in water

No toxic

Pole coloured

Water is purified by the process:

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Aeration

Coagulation

Chlorination

All of these

Which of the following factors is not used to determine the quality of water

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COD

BOD

DO

Available chlorine

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

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Pb

Cr

Hg

All of these

Which one of the following is not air pollutant gas

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CO

CO₂

NO

SO₂

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

Heat balance of earth is maintained by

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Atmosphere

Hydrosphere

Lithosphere

Stratosphere

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Exposure to CO results in

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Headche

Fatigue

Unconsciousness

All of these

Which factor is helping to reduce the environment pollution

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rapid growth population

urbanization

idustrialization

increase of plantation

Why a C - Cl bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

Ozone layer is high:

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20-23 km

22-25 km

23-26 km

25-28 km

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

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

Boron, aluminium, gallium, indium and thallium belong to group lll-A of the periodic table show a decrease with increasing relative atomic mass:

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Ionic character of the compounds

The first ionization energy

The basic character of the oxides

The stability of +2 oxidation

Which gases are produced from landfills?

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NH₃

H₂S

N₂

All of these

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 spectral lines when atoms are subjected to strong electric field is called:

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Compton effect

Stark effect

Zeeman effect

Photoelectric effect

Most harmful of biosphere is

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Deforestation

Nuclear fail out

Salinity

Water logging

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

Many petroleum products are:

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coloured

colourless

testy

poisoinous

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

In Purification of potable water the coagulant used is

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nickel sulpahte

copper sulpahte

barium sulphate

alum

What change in plants indicates toxic effect of SO₂

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Weathering of leaves

Darkening of leaves

Falling of leaves

Bleaching of leaves

Ozone is usually produced in the

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South polar region

North pole region

Tropical region

Thermosphere zone

The cause of minamata disease is the pollution of

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Arsenic (As) into atomosphere

Industrial waste having Hg

Organic waste in drinking H₂O

Oil spills in H₂O

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

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Al

He

Pb

Ca

Out of total amount of water available for human use is

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0.30%

0.2%

40%

50%