Question # 1

Ph of unpolluted rain water is

Choose an answer

07

Less than 6

5.6

Less than 5

DDT is a:

Choose an answer

Fungicide

Insecticide

Herbicide

All

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

Choose an answer

live stock waste

oil leaks and spills

disposal of industrial effluents

rain

Hardness which can be removed by boiling is called

Choose an answer

Permanent hardness

Temporary hardness

Stiffness

Toughness

A single free chlorine redical can destroy ozone molecules upto:

Choose an answer

100000

100

1000

10000

Suspended matter is settled in purification of water by:

Choose an answer

aeration

coagulation

chlorination

treatment

The film forming components of paints are

Choose an answer

resins

thinners

pigments

driers

Ocean contains part earth's water:

Choose an answer

95%

96%

97%

98%

Troposphere extends upto km:

Choose an answer

0-15 km

10-15 km

15-40 km

Primary pollutants are:

Choose an answer

oxides of sulphur

oxides of carbon

oxides of nitrogen

All of these

During thunderstorms, water dissolves

Choose an answer

Dust particles

HCl

Nitric acid

Clouds

Chlorination of water is effective for

Choose an answer

Killing pathogens

Removing dust

Removing hardness

Increasing oxygen content

Coal contains percentage of sulphur:

Choose an answer

1-9%

5-9%

6-9%

7-9%

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

Choose an answer

Pb

Cr

Hg

All of these

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

Choose an answer

Ionic character of the compounds

The first ionization energy

The basic character of the oxides

The stability of +2 oxidation

Ozone is a gas having boiling point

Choose an answer

Unstable

High

Low

Moderate

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

Choose an answer

CCl₄

CHCl₃

CH₃- CH₂- CH₂- CH₃

CHCl₂- CHF₂

Ozone is present in layer around earth:

Choose an answer

atmosphere

tropospher

stratosphere

thermosphere

Which factor is helping to reduce the environmental pollution

Choose an answer

Urbanization

Industrialization

Increase of plantation

Rapid growth of population

Cyclone collector is used to reduce

Choose an answer

Noise pollution

Air pollution

Water pollution

Radioactive pollution

Factors affecting quality of water:

Choose an answer

D.O

BOD

COD

a,b,c

For incineration temperature range is (in ^oC)

Choose an answer

700-800

800-900

900-1000

1000-1100

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

The coagulant may be

Choose an answer

Ag⁺

Cu²⁺

Al³⁺

Si⁴⁺

Air pollution causes

Choose an answer

Acid rain

O₃ depletion

Green House Effect

All

The rigid rocky part of earth crust called lithosphere extends upto a depth of:

Choose an answer

10 km

100 km

1000 km

1500 km

Chlorofluorocarbon, CF₂Cl₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

Choose an answer

The layer of earth around the earth is called:

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

Biosphere

One of the environment problem is the formation of oil slicks when oil is spilled from tankers in sea water.

Which treatment is suitable to remove oil slicks

Choose an answer

blow air

add Na₂CO₃

use a specially made sorbent having fluorine trapped in it

Use a sorbent having Al₂O₃trapped in it

What is the cause of water pollution

Choose an answer

Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

The amount of Si in the lithosphere is about

Choose an answer

27.72%

30.35%

35.30%

40.21%

Biological oxygen demand (BOD) is associated with

Choose an answer

Organic matter

Micro organisms

Both a and b

None

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

Choose an answer

surface water

ground water

both surface and ground water

neither surface nor ground waters

Which is not considered as pollutant

Choose an answer

O₃

CO₂

NO₂

SO₂

Coagulation removes suspended particles in ran water:

Choose an answer

60%

70%

80%

90%

Ozone acts as:

Choose an answer

Pollutant

saver

oxidatant

All of these

The water is considered to be polluted when the concentration of oxygen in it is

Choose an answer

6 - 9ppm

6 ppm

8 ppm

Less than 4pm

A chemist says that glass must be a super cooled liquid. the reason that he might have in his mind is that glass has:

Choose an answer

Definite shape

Definite volume

Crystalline structure

No crystalline structure

Choose the chief air pollutant among the following which depletes ozone layer

Choose an answer

Carbon monoxide

Carbon dioxide

Chloroflurocarbons and nitrogen oxides

Sulphur dioxide

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

Choose an answer

Coagulation

Aeration

Hydration

Dehydration

Test of incomplete combustion of petrol in the presence of

Choose an answer

CO₂

SO₂

NO₂

Co

The most important pesticides are:

Choose an answer

Herbicides

Insecticides

Fungicides

All

A single chloride free radical of CFCs can destroy upto ozone molecules:

Choose an answer

10

100

1000

100000

HOCl is a compound:

Choose an answer

Polor inorganic

organic

Ionic

covalant

Water bodies are included in:

Choose an answer

Atmosphere

Hydrosphere

Lithosphere

All of these

Soil remediation means

Choose an answer

to make it suitable for cultivation of crops

to make it acidic

to make it alkeline

to add manure into it

Atmosphere consists of gasses:

Choose an answer

N₂

O₂

Ar

All

The normal amount of overhead ozone is

Choose an answer

350 DU

450 DU

400 DU

300 DU

The range of UV-B is:

Choose an answer

320 to 400 nm

200 to 280 nm

280 to 320 nm

50 to 400 nm

Part of fresh water consumed in domestic purpose:

Choose an answer

1%

2%

69%

8%

Fungicides are the pesticides which:

Choose an answer

Control the growth of fungus

Kills insects

Kills plants

Kill herb

Water is purified by:

Choose an answer

Filtration

aeration

coagualation

All of these

CFCs are mainly used in industries due to

Choose an answer

Low cost

Gaseous nature

High reactivity

Un stability

Biochemical oxygen demand (BOD) is the capacity of organic matter in natural water to consume oxygen with in a period of

Choose an answer

2 day

6 day

5 day

7 day

Ground and surface waters are contaminated and become polluted due to the human activity. Which human activity will not cause water pollution

Choose an answer

live stock waste

agricultural pesticides

oil beaks and spills

all of the above

Lead pollution is mainly due to

Choose an answer

Metallic pollution

Space pollution

Acid rain

Cd pollution

The normal amount of overhead ozone is about in DU:

Choose an answer

150

250

350

450

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

Choose an answer

damages to eyes

aggravates asthma

chest discomfort

all of these

Eleven elements made part of earth mass:

Choose an answer

97.5%

98.5%

99.5%

100%