SC11 8.1 and 8.2

Which of the following is/are not found in clean air? (there can be more than one answer)

• Oxygen

• Nitrogen

• carbon monoxide

• carbon dioxide

• nitrogen oxide

Which gas in the air is important for living organisms?

• Hydrogen

• Nitrogen

• Oxygen

• Carbon dioxide

Which human activities can cause air pollution?

• Burning of fossil fuel to produce electricity

• Breathing out carbon dioxide

• Burning of petrol in vehicles

• Clearing of forests by burning trees

Which air pollutants can be produced due to human activities?

• Carbon monoxide

• Sulfur dioxide

• Particulate matter

• Nitrogen oxide

Which natural events can cause air pollution?

• Raining

• Volcano eruption

• Lightning

• Driving cars

Which pollutants can be produced by natural events?

• Carbon monoxide

• Sulfur dioxide

• Particulate matter

• Nitrogen oxide

What are possible sources of carbon monoxide?

• Electricity generating plant

• Vehicle engines

• Volcanoes

• Forest fires

• Lightning

What are possible sources of sulfur dioxide?

• Electricity generating plant

• Vehicle engines

• Volcanoes

• Forest fires

• Lightning

What are possible sources of particulate matter?

• Electricity generating plant

• Vehicle engines

• Volcanoes

• Forest fires

• Lightning

What are possible sources of nitrogen oxide?

• Electricity generating plant

• Vehicle engines

• Volcanoes

• Forest fires

• Lightning