Question # 1

Contamination of water of tanning industries is due to:

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Cr(III)

Cr(VI)

Mn(III)

Mn(VII)

Which not a method for solid waste management>

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Landfill

Incinerating

Recycling

None of these

Coal contains sulphur in it:

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1-3%

1-6%

1-9%

1-12%

The most important pesticides are:

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Herbicides

Insecticides

Fungicides

All

Transportation causes to produce CO₂ in atmosphere:

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72%

73%

74%

75%

Ecosystem is a smaller unity of

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Nydosphere

Biosphere

Lithosphere

Attmosphere

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

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live stock waste

agricultural pesticides

oil beaks and spills

all of the above

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

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COD

BOD

DO

Available chlorine

Chemicals used to kill fungi are:

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Herbicides

Insecticides

Pesticides

fungicides

Alkali metals react viotlently with halogens:

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Halides

Anhydrides

Hydrides

None of the above

By the mid of 1980s depletion of total overhead ozone in antarctic region is

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20%

30%

40%

50%

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

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50%

60%

Less than 40%

More than 80%

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

Hard water can block radiators due to formation of

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Insoluble calcium and magnesium salts

Insoluble sodium salts

In soluble phosphate salts

Insoluble potassium salts

Coagulation removes suspended particles in ran water:

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60%

70%

80%

90%

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

In purification of potable water the coagulant used is:

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Nickel sulphate

Copper sulphate

Barium sulphate

Aluminium sulphate

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

Many petroleum products are:

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coloured

colourless

testy

poisoinous

The largest item which is recycled is

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newspaper

plastic

aluminium

oil

The reason of acid rains is

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Release of CO in excess by in complete combustion

Excess release of NO₂and SO₂from buring of fossil fules

Formation of excess CO₂due to combustion and respiration

Formation of NH₃in excess from industry and coal gas

alum or aluminium sulphate used as coagulant in alkaline medium change into precipitate of radicals of alumimium.

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sulphates

oxides

hydroxides

chlorides

Which gas is not a constituent of atmosphere?

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Xe

O₃

H₂

F₂

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

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NO

SO₂

O₃

Hydrocarbons

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

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

99.5% mass of lithosphere is made of

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03 elements

8 elements

11 elements

15 elements

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

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aeration

coagulation

chlorination

treatment

Chemicals used to kill herbs are:

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Herbicides

Insecticides

Pesticides

Fungicides

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 rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Nitrogen percentage in atmosphere is:

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76%

77%

78%

79%

What is the morality of a solution containing 15g of urea is 500cm³ of solution?

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1M

0.5M

2M

1.5M

The disposal of domestic refuse, commercial and industrial solid wastes are studied under the title

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Solid waste management

Waste management

Solid management

Semisolid management

Photochemical smog consists of higher concentration of:

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Oxidants

Ozone

a & b

NO₃

Ozone gas has boiling point:

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Low

High

Medium

Highest

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

Insoluble ferric oxide is produced in the pH range:

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1 to 8

6 to 9

3 to 13

8 to 13

The pH range of the acid rain is

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7 - 6.5

6.5 - 6

6 - 5.6

Less than 5

Contamination of Hg comes into surface water from chlor industrial wastes. Why is Hg Toxic.

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It attaches to sulphur of the disulphide link

Hg is a heavy metal

Hg is liquid at room temperature

Hg is non reactive chemically

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

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

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1960s

1970s

1980s

1990s

Temporary hardness can be removed by adding

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Lime

Carbon

Oxygen

Slaked lime

In Purification of potable water the coagulant used is

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nickel sulpahte

copper sulpahte

barium sulphate

alum

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 suspended particles in the raw water can be removed by the

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Coagulation

Aeration

Hydration

Dehydration

What is component of environment?

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Atmosphere

Hydrosphere

Lithosphere

All of these

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

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

Hydrosphere includes

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Seas and rivers

Ocean & polar ice caps

Ground water

All of above

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

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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

In water the most important oxidizing agent is dissolved molecular oxygen which ranges form

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

In big/metropolitan cities, atmosphere is mostly polluted due to

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Radioactive fall out

Household waste

Pesticide residue

Automobile exhausts

Dissolved impurities of potable water can be separated by the process of

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reduction

Aeration

Electrolysis

Co-angulation

A single chloride free redical can destroy bow many ozene molecules?

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100

100000

10000

10

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

Augus smith discovered in the mid of seventeenth century:

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acid

Base

Acid rain

Fertilizer

For incineration temperature range is (in ^oC)

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700-800

800-900

900-1000

1000-1100

BOD means

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Boron oxygen deuterium

Biochemical oxygen demand

Biochemical oxygen dissolved

Biochemical oxygen death