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ExamSprint Handbook
Question 1. Which concept defines the current geological epoch in which humans are the dominant force shaping Earth’s systems? A) Holocene B) Anthropocene C) Pleistocene D) Quaternary Answer: B Explanation: The Anthropocene denotes the era where human activities have become the primary driver of planetary change, distinguishing it from the Holocene. Question 2. The I = P × A × T equation is used to estimate environmental impact. What does “A” represent? A) Affluence (consumption per person) B) Agriculture output C) Atmospheric concentration of CO₂ D) Area of land used Answer: A Explanation: In I = PAT, “A” stands for affluence, reflecting per-capita consumption levels that amplify impact. Question 3. Which of the following regions has the highest per-capita CO₂ emissions as of the latest data? A) Sub-Saharan Africa B) South Asia C) North America D) Southeast Asia Answer: C
ExamSprint Handbook
Explanation: North America (especially the United States and Canada) has the highest per-capita CO₂ emissions due to energy-intensive lifestyles. Question 4. The primary chemical reaction that destroys ozone in the stratosphere involves which catalytic species? A) Nitrogen oxides (NOx) B) Chlorine atoms (Cl) C) Sulfur dioxide (SO₂) D) Methane (CH₄) Answer: B Explanation: Chlorine atoms released from CFCs catalytically break O₃ into O₂, driving ozone depletion. Question 5. The Montreal Protocol’s success is largely attributed to which of the following? A) Immediate bans on all greenhouse gases B) Strong industry participation and phased reductions C) Financial penalties imposed on developing nations D) Requirement for all nations to achieve net-zero emissions by 2020 Answer: B Explanation: The protocol’s phased, flexible approach and cooperation with manufacturers enabled rapid reductions of ODS. Question 6. Which greenhouse gas has the highest global warming potential (GWP) over a 100-year horizon? A) CO₂ B) CH₄
ExamSprint Handbook
A) The amount of CO₂ emitted per unit of electricity generated B) The total carbon stored in the fuel before combustion C) The ratio of carbon to hydrogen in the fuel molecule D) The speed at which carbon is sequestered in soils Answer: A Explanation: Carbon intensity measures CO₂ emissions per kilowatt-hour (kWh) of electricity produced. Question 10. Which renewable energy technology is most limited by geographic availability? A) Solar photovoltaic B) Onshore wind C) Hydropower D) Geothermal Answer: C Explanation: Hydropower requires sufficient water flow and suitable topography, limiting its global distribution. Question 11. Which mitigation approach involves capturing CO₂ from power plants and storing it underground? A) Carbon taxation B) Renewable portfolio standards C) Carbon Capture and Storage (CCS) D) Energy efficiency standards Answer: C Explanation: CCS directly removes CO₂ emissions at the source and injects them into geological formations.
ExamSprint Handbook
Question 12. Under the Paris Agreement, what does “NDC” stand for? A) National Development Council B) Net-Decarbonization Commitment C) Nationally Determined Contribution D) Non-Discriminatory Climate policy Answer: C Explanation: NDCs are each country’s pledged actions to reduce emissions and adapt to climate change. Question 13. Which pollutant is the primary precursor for ground-level ozone formation? A) Sulfur dioxide (SO₂) B) Nitrogen oxides (NOₓ) C) Particulate matter (PM₂.5) D) Carbon monoxide (CO) Answer: B Explanation: NOₓ reacts with VOCs under sunlight to produce tropospheric ozone. Question 14. Black carbon (soot) primarily contributes to climate warming by: A) Reflecting sunlight back to space B) Absorbing solar radiation and heating the atmosphere C) Catalyzing ozone formation in the stratosphere D) Reacting with methane to form CO₂ Answer: B
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C) Construction of dams D) Satellite communications Answer: B Explanation: Biodiverse ecosystems support pollinators, essential for many agricultural crops. Question 18. The “Sixth Extinction” refers to: A) The extinction of the dinosaurs 66 million years ago B) The ongoing, human-driven loss of species at unprecedented rates C) The loss of marine mammals due to whaling D) The disappearance of invasive species after control programs Answer: B Explanation: The term denotes the current rapid biodiversity loss caused largely by anthropogenic pressures. Question 19. Which Sustainable Development Goal (SDG) directly addresses climate action? A) SDG 2 – Zero Hunger B) SDG 6 – Clean Water and Sanitation C) SDG 13 – Climate Action D) SDG 15 – Life on Land Answer: C Explanation: SDG 13 is explicitly dedicated to taking urgent action to combat climate change. Question 20. Ocean acidification is caused primarily by:
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A) Increased runoff of nitrates from agriculture B) Uptake of atmospheric CO₂ by seawater forming carbonic acid C) Overfishing of calcifying organisms D) Rising sea surface temperatures Answer: B Explanation: Dissolution of CO₂ in seawater forms carbonic acid, lowering pH and affecting calcifying species. Question 21. Which of the following best characterizes the “carbon budget” concept? A) The total amount of carbon stored in the Earth’s crust B) The allowable cumulative CO₂ emissions to stay below a temperature threshold C) The yearly carbon emissions of a single country D) The amount of carbon captured by forests each year Answer: B Explanation: The carbon budget quantifies the total CO₂ that can be emitted while limiting warming to a specific target (e.g., 1.5 °C). Question 22. Which technology converts sunlight directly into electricity without moving parts? A) Concentrated solar power (CSP) B) Photovoltaic (PV) cells C) Wind turbines D) Biomass gasifiers Answer: B Explanation: PV cells use the photoelectric effect to generate electricity directly from sunlight.
ExamSprint Handbook
Explanation: Hydrological shifts denote modifications in the water cycle, including rainfall distribution and extreme events. Question 26. Which of the following is a major advantage of nuclear power in a low-carbon energy mix? A) Zero radioactive waste B) Unlimited fuel supply C) High capacity factor and low operational emissions D) Rapid construction time comparable to solar farms Answer: C Explanation: Nuclear plants operate continuously (high capacity factor) and emit negligible CO₂ during operation. Question 27. Which of the following best describes “intermittency” in renewable energy? A) The tendency for renewable sources to cause grid instability at night B) The variable and non-continuous nature of generation from solar and wind C) The high cost of storing renewable electricity D) The legal restrictions on building renewable installations Answer: B Explanation: Intermittency refers to the fluctuation of output due to weather and daylight cycles. Question 28. The “Keeling Curve” is a graph that tracks: A) Global temperature anomalies since 1880 B) Atmospheric CO₂ concentration at Mauna Loa Observatory C) Sea-level rise measured by satellite altimetry
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D) Ozone hole size over Antarctica Answer: B Explanation: The Keeling Curve shows the steady rise in CO₂ measured at Mauna Loa, evidencing anthropogenic emissions. Question 29. Which factor most strongly influences the radiative forcing of a greenhouse gas? A) Molecular weight B) Atmospheric concentration and infrared absorption characteristics C) Solubility in water D) Reactivity with ozone Answer: B Explanation: Radiative forcing depends on how much of the gas is present and how effectively it absorbs IR radiation. Question 30. The “Paris Agreement” aims to limit global warming to well below which temperature increase above pre-industrial levels? A) 1 °C B) 1.5 °C C) 2 °C D) 3 °C Answer: B Explanation: The agreement’s long-term goal is to keep warming “well below 2 °C” and pursue efforts to limit it to 1.5 °C. Question 31. Which of the following best explains why methane (CH₄) is a potent greenhouse gas despite its shorter atmospheric lifetime than CO₂?
ExamSprint Handbook
Question 34. Which of the following best describes the “tragedy of the commons” in environmental economics? A) Overuse of shared resources because individual users act in self-interest B common property rights are protected by strict legislation C) Collective action always leads to sustainable outcomes D) Private ownership eliminates resource depletion Answer: A Explanation: The tragedy of the commons explains how common-pool resources are overexploited when users ignore collective impacts. Question 35. Which of the following is a major source of nitrous oxide (N₂O) emissions? A) Coal combustion in power plants B) Agricultural fertilizer application C) Landfill methane capture systems D) Oceanic absorption of CO₂ Answer: B Explanation: Synthetic and manure-based nitrogen fertilizers release N₂O during nitrification and denitrification. Question 36. The “CH₄ leakage” problem in natural gas systems primarily undermines which climate mitigation strategy? A) Transition to coal-based power B) Use of biofuels in aviation C) Substituting natural gas for coal to reduce CO₂ emissions D) Implementing carbon capture at power plants
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Answer: C Explanation: If methane leaks exceed a certain threshold, the climate benefit of switching from coal to natural gas disappears. Question 37. Which of the following best characterizes “energy efficiency”? A) Generating more energy from the same fuel source B) Reducing the amount of energy required to provide the same service C) Storing excess renewable energy for later use D) Increasing the carbon intensity of a fuel Answer: B Explanation: Energy efficiency means achieving identical output while consuming less energy. Question 38. Which of the following is the most abundant greenhouse gas emitted by human activities? A) Methane (CH₄) B) Nitrous oxide (N₂O) C) Carbon dioxide (CO₂) D) Water vapor (H₂O) Answer: C Explanation: CO₂ accounts for roughly 76 % of total anthropogenic GHG emissions by weight. Question 39. The “thermal expansion” contribution to sea-level rise is caused by: A) Melting of Antarctic ice sheets B) Warming of ocean water, increasing its volume
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A) Government policies that respond to climate change impacts B) Processes that amplify or dampen the original climate forcing C) Public opinion surveys on climate science D) The time lag between emissions and temperature rise Answer: B Explanation: Climate feedbacks are mechanisms (e.g., water-vapour, albedo changes) that modify the climate response. Question 43. Which of the following pollutants is most directly linked to cardiovascular mortality in urban populations? A) Ozone (O₃) B) Particulate matter ≤2.5 μm (PM₂.5) C) Sulfur dioxide (SO₂) D) Carbon monoxide (CO) Answer: B Explanation: Fine particulate matter penetrates deep into lungs and bloodstream, increasing cardiovascular risk. Question 44. Which of the following best explains why “renewable portfolio standards” (RPS) are used by governments? A) To set a minimum price for electricity B) To require a certain percentage of electricity to come from renewable sources C) To subsidize fossil fuel extraction D) To mandate nuclear power plant construction Answer: B Explanation: RPS policies compel utilities to procure a defined share of renewable energy.
ExamSprint Handbook
Question 45. The “IPCC Working Group I” focuses on: A) Impacts, adaptation, and vulnerability B) Mitigation of climate change C) The physical science basis of climate change D) Socio-economic aspects of climate policy Answer: C Explanation: Working Group I assesses the scientific evidence of climate change (physics, observations, models). Question 46. Which of the following is a significant driver of agricultural greenhouse gas emissions? A) Use of drip irrigation B) Application of nitrogen-based fertilizers C) Mechanized harvesting with electric tractors D) Crop rotation with legumes Answer: B Explanation: Synthetic nitrogen fertilizers release N₂O, a potent GHG, during their life cycle. Question 47. Which of the following best describes “climate justice”? A) Ensuring all nations have equal carbon emissions B) Recognizing that climate impacts and responsibilities are distributed unequally and addressing fairness C) Prioritizing economic growth over environmental protection D) Implementing a single global carbon tax rate
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C) Lead poisoning D. Hearing loss Answer: A Explanation: Ozone irritates the respiratory tract, worsening asthma and COPD. Question 51. Which of the following best explains the concept of “planetary boundaries”? A) Legal limits on national carbon emissions B) Thresholds in Earth system processes that, if crossed, could lead to undesirable environmental change C) Economic trade-offs between development and conservation D) Borders between countries with different climate policies Answer: B Explanation: Planetary boundaries identify safe operating limits for critical Earth system functions. Question 52. The primary mechanism by which forests sequester carbon is: A) Direct conversion of CO₂ into methane B) Photosynthetic fixation of CO₂ into biomass C) Emission of volatile organic compounds that trap heat D) Reflecting sunlight to cool the atmosphere Answer: B Explanation: Through photosynthesis, trees absorb CO₂ and store carbon in wood, leaves, and soil. Question 53. Which of the following is NOT a characteristic of a “low-carbon” energy system?
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A) High reliance on fossil fuel combustion without carbon capture B) Significant share of renewables C) Electricity generation with minimal CO₂ emissions per kWh D) Integration of energy efficiency measures Answer: A Explanation: High fossil-fuel use without mitigation contradicts a low-carbon system. Question 54. Which of the following best describes “adaptive capacity” in climate change contexts? A) The ability of ecosystems to resist any change B) The potential of societies to adjust to climate impacts and reduce vulnerability C) The speed at which greenhouse gases are removed from the atmosphere D) The rate of technological innovation in renewable energy Answer: B Explanation: Adaptive capacity reflects resources, institutions, and knowledge that enable effective adaptation. Question 55. Which of the following is a major contributor to the formation of secondary organic aerosols (SOA) in the atmosphere? A) Direct emissions of black carbon from diesel engines B) Oxidation of volatile organic compounds (VOCs) emitted by vegetation and industry C) Emission of sulfur dioxide from coal plants D) Release of methane from wetlands Answer: B Explanation: VOC oxidation leads to low-volatility products that condense into SOA, influencing air quality and climate.
