Atmosphere and Environment

What are the main constituents of air?

• Nitrogen and argon

• Oxygen and carbon dioxide

• Nitrogen and carbon dioxide

• Nitrogen and oxygen

What percentage of nitrogen is present in the air?

• 78%

• 21%

• 1%

• 0.03%

Why is nitrogen important for plants?

• It is essential for burning

• It is needed for photosynthesis

• Chlorophyll production

• It is important for the metal industry

What percentage of oxygen is present in the air?

• 78%

• 21%

• 1%

• 0.03%

What is the main gas responsible for air pollution?

• Carbon monoxide

• Nitrogen monoxide

• Carbon dioxide

• Sulphur dioxide

Which of these are natural causes of air pollution?

• Volcanic eruptions

• Deforestation

• Human activities

• Burning of fossil fuels

What are the effects of air pollution?

• Health problems and acid rain

• Excessive growth of algae and ozone layer depletion

• Global warming and thinning of the ozone layer

• All of the above

What is potable water?

• Water suitable for industrial use

• Water contaminated by pollutants

• Water that has been treated for drinking and cooking

• Saline water suitable for desalination

What is the main cause of pollution due to urbanization?

• Burning of fossil fuels

• Disposal of domestic waste

• Emissions from industries

• Use of chemicals

What is the purpose of rainwater harvesting?

• To prevent flood in low-lying areas

• To treat wastewater from sewage and industries

• To reduce the effects of global warming

• To collect and store rainwater for future use