1.2 & 1.3 Atmospheric Pollution and Human Impact

What is the primary function of a catalytic converter in vehicles?

• To reduce fuel consumption

• To convert harmful emissions into less harmful substances

• To increase engine performance

• To filter particulate matter only

Answer explanation

The primary function of a catalytic converter is to convert harmful emissions from the engine into less harmful substances, thereby reducing pollution and improving air quality.

Which gas makes up approximately 78% of Earth's atmosphere?

• Oxygen

• Carbon dioxide

• Nitrogen

• Argon

Answer explanation

Nitrogen is the most abundant gas in Earth's atmosphere, making up about 78%. In contrast, oxygen comprises about 21%, while carbon dioxide and argon are present in much smaller amounts.

What technology uses electrical charges to remove particles from industrial emissions?

• Wet scrubbers

• Catalytic converters

• Electrostatic precipitators

• Carbon filters

Answer explanation

Electrostatic precipitators use electrical charges to attract and remove particles from industrial emissions, making them effective for controlling air pollution. Other options do not utilize electrical charges in this manner.

Which pollutant shows the highest percentage reduction when using catalytic converters?

• Nitrogen oxides

• Hydrocarbons

• Carbon monoxide

• Sulfur dioxide

Answer explanation

Catalytic converters are most effective at reducing nitrogen oxides, achieving the highest percentage reduction compared to hydrocarbons, carbon monoxide, and sulfur dioxide, making nitrogen oxides the correct answer.

Which layer of the atmosphere contains the ozone layer?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Answer explanation

The ozone layer is located in the stratosphere, which is the second layer of the atmosphere. It plays a crucial role in absorbing harmful ultraviolet radiation from the sun.

What is the main difference between wet and dry scrubbers?

• Wet scrubbers use water-based solutions, while dry scrubbers use dry reagents

• Dry scrubbers are more expensive

• Wet scrubbers only remove gases

• Dry scrubbers only remove particulates

Answer explanation

The main difference is that wet scrubbers utilize water-based solutions to capture pollutants, while dry scrubbers employ dry reagents. This distinction is crucial for understanding their operational mechanisms.

Which human activity contributes most significantly to atmospheric carbon dioxide levels?

• Agriculture

• Transportation

• Deforestation

• Industrial processes

Answer explanation

Deforestation significantly increases atmospheric carbon dioxide levels as trees, which absorb CO2, are removed. This process releases stored carbon and reduces the planet's capacity to sequester CO2, making it a major contributor.

What percentage of particulate matter can electrostatic precipitators typically remove from industrial emissions?

• 50%

• 70%

• 80%

• 90%

Answer explanation

Electrostatic precipitators are highly effective in removing particulate matter from industrial emissions, typically achieving removal rates of up to 90%. This makes them a crucial technology for air pollution control.

Which greenhouse gas has shown the largest percentage increase from pre-industrial levels?

• Carbon dioxide

• Methane

• Nitrous oxide

• Water vapor

Answer explanation

Carbon dioxide has increased the most from pre-industrial levels, primarily due to fossil fuel combustion and deforestation. Its rise significantly impacts global warming, making it the leading greenhouse gas in terms of percentage increase.

What is the primary purpose of the Clean Air Act?

• To promote industrial growth

• To regulate and reduce air pollution

• To increase vehicle production

• To manage water resources

Answer explanation

The primary purpose of the Clean Air Act is to regulate and reduce air pollution, ensuring cleaner air for public health and the environment. This makes 'To regulate and reduce air pollution' the correct choice.