Question # 1

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

The force which hold the atoms together to form a compound is called:

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Dispersion forces

London forces

A chemical bond

Ven der wall's forces

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

Which is unnecessary for purification of water for drinking purposes

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Coagulation

Aeration

Treatment with Iodine

Treatment with chlorine

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

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

Elevated concentration of ______________ is harmful for fish as it clog the gills causing suffocation

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AI

Hg

As

Cr(vi)

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

Which one of the following is used as coagulant for purification potable water

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

Which is not the affect of polluted air on environment

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acid rain

smog

ozone

global warming

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

Splitting 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

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

The film forming components of paints are

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resins

thinners

pigments

driers

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

An excellent source of energy without causing pollution is

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Fossil fuel

Sun

Petroleum

Nuclear reactor

How much quantity of water is in the domestic use

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0.08%

16%

24%

90%

Leather tanneries use big auantities of:

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Cr Vi salts

Cr III salts

Mn-salts

Pb-salts

In incinerating the waste is burnt at

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1000°C

100°C

2000°C

1500°C

Detergent greatly effects the

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Aquatic life

Modern life

Terrestrial life

Plants life

Which step is unnecessary for purification of water for drinking purposes

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aeration

coagulation

treatment with chlorine

treatment with iodine

Water in swimming pools is purified by adding

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Sodium

Chlorine

Phosphorus

Potassium

Water is essential for life on

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Moon

Space

Earth

Sun

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

Smaller unit of biosphere is:

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specie

ecosystem

plankton

troposphere

Augus smith discovered in the mid of seventeenth century:

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acid

Base

Acid rain

Fertilizer

HOCl is a compound:

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Polor inorganic

organic

Ionic

covalant

Polar ice caps can melt due to

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Acid rain

Green House Effect

Smog

Chlorofluorocarbons

CFC's are known to cause depletion of ozone layer therefore their use has been banned in refrigerators and air conditioners. Which alternate compound may be suitable to replace CFC

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CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

Lanthanides an actinides belong to following group of periodic table:

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IB

VIIIB

IIB

IIIB

Heat balance of earth is maintained by sphere:

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Hydrosphere

atmosphers

lithosphere

biosphere

The range of UV-B is:

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320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Term ozone hole is used for depletion of ozone during months of:

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Jan-Feb

March - Sep

Sep- Nov

Dec-Feb

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

The pH range of the acid rain is

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6.5 - 6

Less than 5

8 - 7.5

7 - 6.5

Part of fresh water consumed in domestic purpose:

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1%

2%

69%

8%

a hole used to dump the municipal wastes is called:

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landfill

effluents

leachate

inclneration

In addition to many pollutants present in ground water, a successful study was conducted to remove a highly Toxic chemical.What chemical is this

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Cobalt

Nickel

Arsenic

Sulphur

Which of the following does not contribute towards the formation of photochemical smog?

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NO

SO₂

O₃

Hydrocarbons

Why a C- C 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

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

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Eyes

Ears

Stomach

Nose

Heat balance of earth is maintained by

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Atmosphere

Hydrosphere

Lithosphere

Stratosphere

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

Cyclone collector is used to reduce

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Noise pollution

Air pollution

Water pollution

Radioactive pollution

Leachate contains:

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fatty acids

Bacteria

Heavy metals

All of these

The Catalyst used in the contact tower for the manufacture of H₂SO₄ is easily poisoned by:

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Nitrous oxide

Nitrogen gas

Arsenic oxide

Carbon dioxide

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

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

Which one of the following is not a component of environment

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Biosphere

Stratosphere

Hydrosphere

Lithosphere

Sea gets polluted bu accidental oil spills and

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Atmospheric pressure

Nitrogen gas

Cargo oil tankers

Aero plane

The suspended particles in the raw water can be removed by the

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Coagulation

Aeration

Hydration

Dehydration

The ozone depletion in the stratophere is mainly due to the reaction of ozone with

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Freons

CFCs

Both A and B

None

Oceans, rivers, streams, leaks, polar ice caps, glaciers and group water reservoirs are included in

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Atmosphere

Lithosphere

Hydrosphere

Biosphere

Which is the following is true about galvanic cell:

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Reduction occurs at cathode

Reduction occurs at anode

Anode is negatively charged

Chathode is positively charged

Which heavy metals do not have any safe limits

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As

Hg

Cr

All of these