here below some basic MCQ’s about”Greenhouse effect and Global warming” which is explained in details. Let’s check one by one which is given below.
1. Which of the following gases is primarily responsible for the greenhouse effect?
- A. Oxygen (O₂)
- B. Nitrogen (N₂)
- C. Carbon dioxide (CO₂)
- D. Argon (Ar)
Answer: C. Carbon dioxide (CO₂)
Explanation:
The greenhouse effect is primarily caused by gases that trap heat in the Earth’s atmosphere. Carbon dioxide (CO₂) is one of the most significant greenhouse gases. While oxygen and nitrogen are abundant in the atmosphere, they do not contribute significantly to the greenhouse effect. CO₂, along with other gases like methane (CH₄) and water vapor, traps heat and contributes to global warming.
2. Which of the following is a consequence of global warming?
- A. Decrease in sea level
- B. Increase in agricultural productivity
- C. Melting of polar ice caps
- D. Stabilization of Earth’s climate
Answer: C. Melting of polar ice caps
Explanation:
Global warming leads to the melting of polar ice caps as temperatures rise globally. This contributes to rising sea levels and a loss of habitat for polar species. Other consequences include more frequent extreme weather events and shifting ecosystems.
3. Which gas has the highest Global Warming Potential (GWP) over a 100-year period?
- A. Carbon dioxide (CO₂)
- B. Methane (CH₄)
- C. Water vapor (H₂O)
- D. Nitrous oxide (N₂O)
Answer: B. Methane (CH₄)
Explanation:
Methane (CH₄) has a much higher Global Warming Potential (GWP) than carbon dioxide over a 100-year period. The GWP of methane is about 25 times that of carbon dioxide. Nitrous oxide also has a high GWP, but methane’s is significantly higher than CO₂.
4. Which of the following is not a greenhouse gas?
- A. Nitrous oxide (N₂O)
- B. Water vapor (H₂O)
- C. Methane (CH₄)
- D. Oxygen (O₂)
Answer: D. Oxygen (O₂)
Explanation:
Oxygen (O₂) is not considered a greenhouse gas. Greenhouse gases are those that absorb and emit infrared radiation, leading to the warming of the Earth’s surface. Oxygen, while crucial for life, does not contribute significantly to the greenhouse effect.
5. Which of the following practices can help reduce global warming?
- A. Deforestation
- B. Fossil fuel burning
- C. Afforestation
- D. Increased industrialization
Answer: C. Afforestation
Explanation:
Afforestation refers to the planting of trees in areas where there were none before, and it helps reduce global warming by absorbing carbon dioxide from the atmosphere through the process of photosynthesis. Deforestation, fossil fuel burning, and industrialization increase the concentration of greenhouse gases, worsening global warming.
6. Which protocol was established to control the emission of greenhouse gases?
- A. Montreal Protocol
- B. Kyoto Protocol
- C. Paris Agreement
- D. Stockholm Convention
Answer: B. Kyoto Protocol
Explanation:
The Kyoto Protocol was established in 1997 to commit industrialized countries to limit and reduce greenhouse gas emissions. It was the first major international agreement aimed at addressing climate change by controlling the emissions of major greenhouse gases.
7. The phenomenon of increasing average temperatures on Earth due to the greenhouse effect is called:
- A. Ozone depletion
- B. Global warming
- C. Acid rain
- D. Smog
Answer: B. Global warming
Explanation:
Global warming refers to the increase in Earth’s average surface temperature due to the buildup of greenhouse gases like CO₂, methane, and nitrous oxide in the atmosphere, which trap heat.
8. Which of the following is a natural greenhouse gas?
- A. Chlorofluorocarbon (CFC)
- B. Methane (CH₄)
- C. Nitrous oxide (N₂O)
- D. Both B and C
Answer: D. Both B and C
Explanation:
Methane (CH₄) and nitrous oxide (N₂O) are naturally occurring greenhouse gases. While they can also be released through human activities (e.g., agriculture, industrial processes), they exist naturally in the atmosphere and contribute to the greenhouse effect. CFCs, on the other hand, are synthetic chemicals.
9. Which human activity contributes the most to the increase in CO₂ levels?
- A. Planting more trees
- B. Burning of fossil fuels
- C. Use of renewable energy
- D. Organic farming
Answer: B. Burning of fossil fuels
Explanation:
The burning of fossil fuels (such as coal, oil, and natural gas) for energy production is the largest contributor to the increase in CO₂ levels in the atmosphere, driving global warming and climate change. Renewable energy and planting trees help mitigate CO₂ emissions.
10. Which of the following statements is correct regarding the greenhouse effect?
- A. It is a naturally occurring process.
- B. It is solely caused by human activities.
- C. It has no impact on global temperatures.
- D. It can be entirely reversed by human intervention.
Answer: A. It is a naturally occurring process.
Explanation:
The greenhouse effect is a naturally occurring process that is essential for maintaining the Earth’s temperature at a level suitable for life. However, human activities, such as the burning of fossil fuels and deforestation, have intensified this effect, leading to global warming.
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