Question # 1

Ozone hole is maximum over

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Europe

Antarctica

Asia

Africa

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

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2 - 4 ppm

4 - 6 ppm

2 - 5 ppm

4 - 8 ppm

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Ecosystem is a smaller unit of

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Hydrosphere

Lithosphere

Biosphere

Atmosphere

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

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Pb

Cr

Hg

All of these

The largest item which is recycled is

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Newspaper

Plastic

Aluminium

Oil

Carbon monoxide is pollutant as it

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Inactivates nerves

Inhibits glycolysis

Combines with oxygen

Combines with hemoglobin

Chromium (VI) is highly toxic and can cause

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Blindness

Cancer

Liver problems

Blood problems

The pH range of the acid rain is

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8 - 7

7 - 6.5

6.5 - 6

Less than 5

Domestic waste mostly constitutes

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Non-biodegradable pollution

Biodegradable pollution

Effluents

Air pollution

The 95.5% mass of Lithosphone is made of 11 elements i.e. O₂, Si, Al, Fe, Ca, Na, K, Mg, Ti, H₂and P. which element is present in trace amount

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Iodine

Bromine

Lead

Carbon

Minamata disease is due to pollution of

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Organic waste into drinking water

Oil spill in water

Industrial waste containing mercury into fishing water

Arsenic into the atmosphere

Mottling of teeth is due to presence of an element in drinking water

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Mercury

Fluorine

Boron

Chlorine

In the atmosphere, CO₂is about

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0.01%

0.03%

0.05%

0.09%

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Photochemical smog is caused by

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CO

CO₂

O₃

NO₂

UV radiations bring about

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Skin cancer

Mouth cancer

Lung cancer

Liver cancer

Chlorofluorocarbon, CF₂CI₂, plays an effective role in removing O₃(ozone) in the stratosphere. Which reaction does not cause the depletion of ozone

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Air pollution is not caused by

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Pollen grains

Hydroelectric power

Industries

Automobiles

Which gas is not a constituent of atmosphere

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Xe

O₃

H₂

F₂

Environmental pollution affects

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Biotic components

Plants only

Man only

Biotic and abiotic components of environment

Cyclone collector is used for minimizing

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Radioactive pollution

Air pollution

Noise pollution

Water pollution

Shahi Qilla may be destroyed by

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Flood in Ravi

Temperature mediated spoilage of marble

Air pollutants from Lahore chemical industries

All the above

Depletion of ozone layer is due to

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Oxides of nitrogen

Oxides of carbon

Oxides of sulphur

None of the above

Ozone depletion in stratosphere shall result in

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Forest fires

Increased incidence of skin cancer

Global warming

None of the above

Drawback DDT as presticide is

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I becomes ineffective after some time

It is less effective than others

It is not easily/rapidly degraded in nature

Its high cost

Acid rain is caused when various atmospheric gases dissolve in rain water. What are the gases that cause rain water

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SO₂

NO₂

CO

A and b only

Polycyolic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

Atomospheric pollutant is

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CO₂

CO

O₂

N₂

Value of chemical oxygen demand (COD) is a measure of chemically oxidizable matter in water. Which value of COD will indicate more polluted water

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Low value

Higher value

Both values

None of these

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

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