Question # 1

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

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100

100000

10000

10

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

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

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

Ozone in stratosphere extends upto km:

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0-15 km

10-15 km

15-40 km

15-25 km

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

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live stock waste

oil leaks and spills

disposal of industrial effluents

rain

The temperature in the incineration process has a range:

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900 to 1000°C

650 to 1100°C

950 to 1300°C

500 to 900°C

The pH range of acid rain is?

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7-6.5

6.5-6

6-5.6

Less than 5

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

Detergents are surfactants and they reduce the

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B.P. of water

Surface tension of water

Wetting ability of water

None of these

Hydrocarbons, SO₂, CO, NH₃nitrogen oxides and compounds of fluorine are called

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Primary pollutant

Secondary pollutant

Tertiary pollutant

None of these

Ozone layer is present in

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Troposphere

Stratosphere

Mesosphere

Ionosphere

It is a biodegradable pollutant

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Salts of HG

DDt

Aluminum foil

Domestic fuel

What is the cause of water pollution

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Chemical and bacterial constants in live stock

The spilled oil in rivers and ponds

Wide spreads used of pesticides

All of these

How much pesticides have been synthesized at present?

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Four thousand

Six thousand

Eight thousand

Ten thousand

Suspended matter is settled in purification of water by:

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aeration

coagulation

chlorination

treatment

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

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aeration

coagulation

chlorination

treatment

Which of the following waste material is not recycled for use again

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Glasses

Paper

Plastic toys

Hides of animals

Transformation is a cyclic process in which used plactic is

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Remelted and styrene is added

Converted into low quality substance

Converted back into original components

None 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

Ozone is a gas having boiling point

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Unstable

High

Low

Moderate

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