1. What is the greenhouse effect?
A) Cooling of Earth’s surface
B) Trapping of heat by gases in the atmosphere
C) Reflection of sunlight into space
D) Absorption of UV rays only
Answer: B
2. Which gas is the most abundant greenhouse gas in Earth’s atmosphere?
A) Carbon dioxide
B) Methane
C) Water vapor
D) Nitrous oxide
Answer: C
3. The greenhouse effect mainly helps to:
A) Freeze the oceans
B) Maintain Earth’s temperature suitable for life
C) Block oxygen
D) Increase wind speed
Answer: B
4. Which human activity contributes most to increased carbon dioxide levels?
A) Fishing
B) Burning fossil fuels
C) Recycling
D) Rainfall
Answer: B
5. Which gas is released in large amounts from rice paddies and livestock?
A) Oxygen
B) Nitrogen
C) Methane
D) Helium
Answer: C
6. Which layer of the atmosphere contains most greenhouse gases?
A) Exosphere
B) Thermosphere
C) Troposphere
D) Mesosphere
Answer: C
7. The enhanced greenhouse effect leads to:
A) Global cooling
B) Ozone hole formation
C) Global warming
D) Decreased rainfall
Answer: C
8. Which of the following is NOT a greenhouse gas?
A) Carbon dioxide
B) Methane
C) Oxygen
D) Nitrous oxide
Answer: C
9. The main source of methane in the atmosphere is:
A) Volcanoes only
B) Industrial smoke
C) Agricultural activities
D) Solar radiation
Answer: C
10. Which gas has the highest global warming potential among these?
A) Carbon dioxide
B) Methane
C) Nitrous oxide
D) Chlorofluorocarbons (CFCs)
Answer: D
11. The natural greenhouse effect keeps Earth’s average temperature around:
A) 0°C
B) -18°C
C) 15°C
D) 50°C
Answer: C
12. Without the greenhouse effect, Earth would be:
A) Too hot for life
B) Too cold for life
C) Full of oxygen
D) Completely dry
Answer: B
13. Deforestation increases greenhouse effect because it:
A) Increases oxygen
B) Reduces carbon dioxide absorption
C) Increases rainfall
D) Stops evaporation
Answer: B
14. Which international agreement aims to reduce greenhouse gas emissions?
A) Montreal Protocol
B) Paris Agreement
C) Kyoto Forest Treaty
D) Geneva Convention
Answer: B
15. Carbon dioxide is mainly produced by:
A) Photosynthesis
B) Respiration and combustion
C) Evaporation
D) Condensation
Answer: B
16. Which sector contributes significantly to greenhouse gas emissions?
A) Transportation
B) Education
C) Sports
D) Tourism only
Answer: A
17. Which renewable energy source helps reduce greenhouse gas emissions?
A) Coal
B) Diesel
C) Solar energy
D) Natural gas
Answer: C
18. The greenhouse effect was first explained by:
A) Isaac Newton
B) Joseph Fourier
C) Charles Darwin
D) Galileo Galilei
Answer: B
19. Nitrous oxide is mainly released from:
A) Oceans
B) Fertilizers and soil management
C) Cars only
D) Wind turbines
Answer: B
20. Increased greenhouse gases can cause:
A) Rising sea levels
B) Decreased sunlight
C) More oxygen
D) Less evaporation
Answer: A
21. Which gas is produced by decomposition of organic waste in landfills?
A) Oxygen
B) Methane
C) Hydrogen
D) Neon
Answer: B
22. The greenhouse effect mainly traps which type of radiation?
A) Ultraviolet
B) Infrared
C) X-rays
D) Gamma rays
Answer: B
23. Which of the following reduces the greenhouse effect?
A) Cutting forests
B) Burning coal
C) Planting trees
D) Increasing vehicles
Answer: C
24. Fossil fuels include:
A) Wood and paper
B) Coal, oil, and natural gas
C) Sunlight
D) Water
Answer: B
25. Climate change is primarily driven by:
A) Natural winds
B) Earthquakes
C) Increased greenhouse gases
D) Ocean tides
Answer: C
26. Which country is among the largest emitters of greenhouse gases globally?
A) Iceland
B) Nepal
C) China
D) Sri Lanka
Answer: C
27. The greenhouse effect is similar to the warming inside a:
A) Refrigerator
B) Microwave
C) Glass greenhouse
D) Freezer
Answer: C
28. Which practice can reduce carbon footprint?
A) Using public transport
B) Burning plastic
C) Cutting trees
D) Using more coal
Answer: A
29. The term “carbon footprint” refers to:
A) Foot size
B) Carbon stored in soil
C) Total greenhouse gas emissions caused by an individual or activity
D) Coal mining process
Answer: C
30. Which atmospheric process allows sunlight to enter but traps heat?
A) Reflection
B) Conduction
C) Greenhouse effect
D) Photosynthesis
Answer: C