Question # 1

Polar ice caps and glaciers consists total earth water:

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1%

2%

3%

4%

Polycyclic aromatic hydrocarbons are taught to be

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Disinfectant

Carcinogenic

Helpful

Reactive

Ozone is effectively removed by

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TNT

CFCs

PVC

CNG

Nitrogen percentage in atmosphere is:

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76%

77%

78%

79%

Chemicals used to kill insects are:

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Herbicides

Insecticides

Pesticides

Fungicides

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

A single chloride free radical of CFCs can destroy upto ozone molecules:

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10

100

1000

100000

SO₂and NO₂cause pollution due to increase in

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Buffer action

Basicity

Acidity

Neutrality

CFCs destroy ozone layer. How many ozone molecule a chlorine free radical can destory

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50,000

10,000

20,000

None of these

Eleven elements made part of earth mass:

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97.5%

98.5%

99.5%

100%

Biological oxygen demand (BOD) is associated with

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Organic matter

Micro organisms

Both a and b

None

The incineration may reduce volume of wastes upto:

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1/4th

1/2nd

2/3rd

3/4th

SO₂produced by volcanoes is about

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75%

67%

69%

70%

The amount of oxygen in the lithosphere is about

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35.50%

40.60%

46.60%

50.50%

Coal contains percentage of sulphur:

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1-9%

5-9%

6-9%

7-9%

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

Which gas produces air pollution?

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oxides of sulphur

oxides of carbon

all of these

A single chloride free radical can destroy the ozone molecules

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100

100000

10000

10

The semi solid wastes in landfills is called:

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Landfill

effluents

Leachate

Incineration

Oceans cove ____________ percent of the surface of the earth

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60

70

80

97

One of the environmental problem is the formation of oil slicks when oil is spilled form 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

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