Carbon dioxide (CO2) is a colorless, odorless gas that forms a vital part of Earth’s atmosphere, making up about 0.04% of the air we breathe. It is produced through natural processes like respiration, volcanic eruptions, and the decay of organic matter, as well as human activities such as burning fossil fuels and deforestation. As a key greenhouse gas, CO2 traps heat from the sun, helping to maintain the planet’s temperature, but its increasing levels due to industrial emissions contribute to global warming and climate change. In the natural world, CO2 is essential for photosynthesis, where plants absorb it to produce oxygen and energy, sustaining life on Earth.
Table of contents
- Part 1: OnlineExamMaker AI quiz maker – Make a free quiz in minutes
- Part 2: 20 CO2 quiz questions & answers
- Part 3: Save time and energy: generate quiz questions with AI technology
Part 1: OnlineExamMaker AI quiz maker – Make a free quiz in minutes
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Part 2: 20 CO2 quiz questions & answers
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1. What is the chemical formula for carbon dioxide?
A. CO
B. CO2
C. C2O
D. CO2H
Answer: B
Explanation: Carbon dioxide is a molecule composed of one carbon atom and two oxygen atoms, represented by the formula CO2.
2. Which process do plants use to absorb CO2 from the atmosphere?
A. Respiration
B. Photosynthesis
C. Transpiration
D. Fermentation
Answer: B
Explanation: Photosynthesis is the process where plants use sunlight to convert CO2 and water into glucose and oxygen.
3. What is the primary role of CO2 in the Earth’s atmosphere?
A. Blocking ultraviolet rays
B. Contributing to the greenhouse effect
C. Forming clouds
D. Creating wind patterns
Answer: B
Explanation: CO2 traps heat in the atmosphere, leading to the greenhouse effect, which helps regulate Earth’s temperature.
4. How is CO2 mainly produced by human activities?
A. Through volcanic eruptions
B. Burning fossil fuels
C. Plant decomposition
D. Ocean evaporation
Answer: B
Explanation: The combustion of fossil fuels like coal, oil, and gas releases large amounts of CO2 into the atmosphere.
5. What happens to CO2 when it dissolves in water?
A. It forms hydrochloric acid
B. It forms carbonic acid
C. It turns into oxygen
D. It remains unchanged
Answer: B
Explanation: CO2 reacts with water to form carbonic acid (H2CO3), which is a weak acid and contributes to ocean acidification.
6. Which gas is CO2 often confused with in terms of its role in respiration?
A. Oxygen
B. Nitrogen
C. Methane
D. Carbon monoxide
Answer: A
Explanation: In respiration, organisms inhale oxygen and exhale CO2, making them closely related in the breathing process.
7. What is the approximate percentage of CO2 in the Earth’s atmosphere?
A. 78%
B. 21%
C. 0.04%
D. 1%
Answer: C
Explanation: CO2 makes up about 0.04% of the atmosphere, though this level is increasing due to human activities.
8. Which of the following is a natural source of CO2?
A. Car exhaust
B. Respiration of animals
C. Factory emissions
D. Power plant smoke
Answer: B
Explanation: Animals release CO2 during respiration as a byproduct of metabolizing food.
9. What effect does increased CO2 have on ocean pH levels?
A. Increases pH (more basic)
B. Decreases pH (more acidic)
C. No effect
D. Stabilizes pH
Answer: B
Explanation: Excess CO2 absorbed by oceans forms carbonic acid, lowering pH and making the water more acidic.
10. In which layer of the atmosphere is most CO2 found?
A. Troposphere
B. Stratosphere
C. Mesosphere
D. Thermosphere
Answer: A
Explanation: The troposphere, the lowest layer, contains the majority of atmospheric gases, including CO2.
11. What is carbon capture and storage (CCS) primarily used for?
A. Increasing CO2 levels
B. Reducing CO2 emissions
C. Producing more CO2
D. Measuring CO2 in the air
Answer: B
Explanation: CCS involves capturing CO2 from industrial sources and storing it underground to prevent its release into the atmosphere.
12. Which human activity is the largest contributor to global CO2 emissions?
A. Agriculture
B. Transportation
C. Electricity and heat production
D. Deforestation
Answer: C
Explanation: Burning fossil fuels for electricity and heat generation accounts for the majority of global CO2 emissions.
13. What is the process called when CO2 is removed from the atmosphere by natural means?
A. Carbon sequestration
B. Carbon emission
C. Photosynthesis only
D. Global warming
Answer: A
Explanation: Carbon sequestration refers to the long-term storage of CO2 in oceans, soils, and plants.
14. At what temperature does CO2 sublime directly from solid to gas?
A. -78.5°C
B. 0°C
C. 100°C
D. -196°C
Answer: A
Explanation: Dry ice, which is solid CO2, sublimes at -78.5°C without melting into a liquid.
15. Which international agreement aims to reduce global CO2 emissions?
A. Kyoto Protocol
B. Montreal Protocol
C. Paris Agreement
D. Both A and C
Answer: D
Explanation: Both the Kyoto Protocol and Paris Agreement focus on reducing greenhouse gases like CO2, though the Paris Agreement is more recent and comprehensive.
16. How does CO2 contribute to climate change?
A. By cooling the planet
B. By trapping heat
C. By reducing sea levels
D. By increasing biodiversity
Answer: B
Explanation: CO2 is a greenhouse gas that absorbs and emits infrared radiation, leading to global warming.
17. What is the main use of CO2 in the food industry?
A. As a preservative
B. In carbonated drinks
C. As a flavor enhancer
D. In packaging materials
Answer: B
Explanation: CO2 is used to carbonate beverages, giving them fizz and extending shelf life.
18. Which element is not present in CO2?
A. Carbon
B. Oxygen
C. Hydrogen
D. None of the above
Answer: C
Explanation: CO2 consists only of carbon and oxygen atoms; hydrogen is not part of its composition.
19. What is the effect of deforestation on CO2 levels?
A. Decreases CO2
B. Increases CO2
C. Has no effect
D. Balances CO2 levels
Answer: B
Explanation: Trees absorb CO2; cutting them down reduces this absorption and releases stored carbon.
20. Which method is used to measure CO2 levels in the atmosphere?
A. Thermometer
B. Barometer
C. Gas analyzer
D. pH meter
Answer: C
Explanation: Instruments like infrared gas analyzers detect and measure CO2 concentrations accurately.
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Part 3: Save time and energy: generate quiz questions with AI technology
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