prep 2 , unit 2 , lesson 1.2

Ozone hole appears over the

• equator.

• north pole.

• south pole.

• near

Ozone hole increases in .......... each year.

• December

• September

• January

• October

........... is/are used as a coolant in cooling devices.

• Methyl bromide gas

• Halons

• Nitrogen oxide

• Freon

All the following are from the uses of chlorofluorocarbon compounds except

• solvent substance.

• flating substance.

• propellant substance.

• heating substance.

............is/are used as an insecticide to preserve stored agricultural crops.

• Methyl bromide gas

• Halons

• Nitrogen oxide

• Freon

............ result(s) from the burning of fuel of ultrasound concorde aeroplanes.

• Methyl bromide gas

• Halons

• Nitrogen oxide

• Freon

Greenhouse effect explains

• erosion of ozone layer.

• a new way of agriculture.

• global warming phenomenon.

• water evaporation.

All of the following gases are greenhouse gases except.........

• CO₂

• 0₂

• N₂0

• CH4

All the following reasons are causing of global warming except.............

• increase in carbon dioxide in the atmosphere.

• decrease in carbon dioxide in the atmosphere.

• Watering the land

• Forests fires only

...... radiation is characterized by thermal effect.

• Infrared

• Ultraviolet

• Visible light

• X-ray