Question # 1

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

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

The % of CO₂in the atmosphere is

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3.0%

0.03%

0.3%

0.5%

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

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AI

Hg

As

Cr(vi)

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

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

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NO

SO₂

O₃

Hydrocarbons

Part of fresh water consumed in industry is:

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1%

2%

69%

23%

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

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Incineration is a process in which solid waste is burned at high temperature ranging from

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500 to 600°C

900 to 1000°C

1000 to 1100°C

600 to 700°C

The destructive distillation of coal gives three products. which of following is not the product of destructive distillation of coal?

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Coal tar

CO₂

Coal gas

Coke

Ocean contains part earth's water:

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95%

96%

97%

98%

Carbon Monoxide is:

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colouriess

orderless

high toxic

All of these

Rigid rocky crust earth upto a depth of 100 km is called:

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Atmosphere

Hydrosphere

Lithosphere

All of these

Pathogens in raw water are killed in step:

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aeration

coagulation

chlorination

treatment

Addition of washing soda removes

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Softness of water

Temporary hardness of water

Permanent hardness of water

Hydrogen from water

The words smog is a combination of smoke and:

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fog

foke

fork

fizzy

Ph of unpolluted rain water is

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07

Less than 6

5.6

Less than 5

Lead pollution is mainly due to

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Metallic pollution

Space pollution

Acid rain

Cd pollution

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

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Definite shape

Definite volume

Crystalline structure

No crystalline structure

Commonly used coagulants are ions of:

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Ferrous

Al

Cr

Ferric

Which of the following is not a heavy industry?

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Iron

Fertilize

Paper

None

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

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

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