Question # 1

The normal amount of overhead ozone is about

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250 Du

300 DU

350 DU

400 DU

Chose a point which is not included in the components of environment

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Stratosphere

Hydrosphere

Lithosphere

Biosphere

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 pH rain of acid rain is

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8 - 7

7 - 6.5

6.5 - 6

less than 5

Ocean contains part earth's water:

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95%

96%

97%

98%

Atmosphere consists of gasses:

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N₂

O₂

Ar

All

Fungicides are the pesticides which

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Kill plants

Kill herbs

Kill insects

Control the growth of fungus

NO and NO₂gases in atmosphere are represented by

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NO

NO₄

NO_x

N_xO_y

Contamination of water of tanning industries is due to:

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Cr(III)

Cr(VI)

Mn(III)

Mn(VII)

Ecology is a science of environment and deals specially with

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stratosphere

biosphere

lithosphere

hydrosphere

Petroleum or crude oil is a complex mixture of compounds mainly:

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benzene

minerals

hydrocarbons

phenols

Men residence time of methane in atmosphere in years is:

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1-7

2-7

3-7

4-7

Hydrosphere covers the surface of erath:

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70.8%

71.8%

72.8%

73.8%

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 gases in the atmosphere are essential for sustaining life on earth. Thus oxygen is required for breathing. What for is carbon dioxide required

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To help plant to under go photosynthesis

To destroy nitrogen oxide from the atmosphere

To help to clean the atmosphere

To help in fixing of bacteria

The temperature of in the incineration of industrial and hazardous waste process has range

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900 - 1000°C

250 - 500°C

950 - 1300°C

500 - 900°C

The pH of the rain water in areas where acid rain is the cause of pollution may be

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6.5

5.6

4.5

2.2

Water is made disinfectant during purification of water to the step:

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aeration

coagulation

chlorination

treatment

Surface and ground water sources are contaminated by various human activities. Which of the following is not human activity that causes contamination in fresh water

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Live stock waste

Oil leaks and spills

Desposal of industrial effluents

Rain

Why a C - Cl bond breaks by uv light

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Cl is most electronegative

Cl is volatile

C - Cl bond energy is smaller than that of C - H bond energy

Uv light provides energy which is sufficient to break C - Cl bond and not C - H bond

The eleventh concentration of metal cause clogs of gills in fish:

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Al

He

Pb

Ca

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