Climate Change Practice Questions
20 free Climate Change practice questions for the Static GK. Tap an option to answer — you get instant feedback, the correct answer, and a detailed explanation for every question.
Which of the following gases has the highest Global Warming Potential (GWP) over a 100-year period?
- A Carbon dioxide
- B Nitrogen trifluoride
- C Nitrous oxide
- D Sulfur hexafluoride
Correct answer: Sulfur hexafluoride
While carbon dioxide is the most abundant, sulfur hexafluoride ($SF_6$) has a GWP of approximately 23,500. This means it is thousands of times more effective at trapping heat in the atmosphere than $CO_2$.
What is the primary mechanism of the 'Greenhouse Effect'?
- A Atmospheric gases absorb outgoing longwave infrared radiation.
- B Atmospheric gases reflect incoming solar ultraviolet radiation.
- C The ozone layer traps heat from volcanic eruptions.
- D Oxygen molecules convert solar energy into thermal energy.
Correct answer: Atmospheric gases absorb outgoing longwave infrared radiation.
Greenhouse gases allow shortwave solar radiation to pass through but absorb the longwave infrared radiation emitted by the Earth's surface. This trapped energy warms the lower atmosphere.
The 'Albedo Effect' refers to which of the following phenomena?
- A The absorption of $CO_2$ by the oceans.
- B The reflectivity of a surface, such as ice or snow.
- C The shift in wind patterns due to El Niño.
- D The rise in global sea level caused by thermal expansion.
Correct answer: The reflectivity of a surface, such as ice or snow.
Albedo is a measure of how much light that hits a surface is reflected without being absorbed. Ice has a high albedo, reflecting most sunlight, while dark ocean water has a low albedo and absorbs more heat.
Which process is primarily responsible for the 'Ocean Acidification' observed alongside climate change?
- A Acid rain falling directly into the sea.
- B The melting of naturally acidic glaciers.
- C The absorption of excess atmospheric $CO_2$ by seawater.
- D Increased runoff of nitrogen-rich fertilizers from farmland.
Correct answer: The absorption of excess atmospheric $CO_2$ by seawater.
When $CO_2$ dissolves in seawater, it reacts with water to form carbonic acid ($H_2CO_3$). This lowers the pH of the ocean, making it difficult for calcifying organisms like corals and shellfish to build their skeletons.
What are 'Milankovitch Cycles'?
- A Changes in solar output every 11 years.
- B Patterns of ocean currents in the Atlantic.
- C The seasonal cycle of $CO_2$ levels measured at Mauna Loa.
- D Long-term variations in Earth's orbit and axial tilt.
Correct answer: Long-term variations in Earth's orbit and axial tilt.
Milankovitch cycles involve changes in Earth's eccentricity, axial tilt, and precession. These astronomical factors have historically triggered the onset and end of ice ages over tens of thousands of years.
Which of the following is a significant 'carbon sink' that naturally removes $CO_2$ from the atmosphere?
- A Boreal forests
- B Permafrost
- C Livestock farming
- D Concrete urban surfaces
Correct answer: Boreal forests
Forests act as carbon sinks by capturing atmospheric $CO_2$ through photosynthesis and storing it in biomass and soil. Protecting these ecosystems is a key strategy for climate mitigation.
The 'Keeling Curve' is a famous graph that tracks what environmental variable?
- A Global average temperature since 1880.
- B The concentration of atmospheric $CO_2$ since 1958.
- C The rate of Arctic sea ice loss per decade.
- D The frequency of Category 5 hurricanes in the Atlantic.
Correct answer: The concentration of atmospheric $CO_2$ since 1958.
The Keeling Curve shows a steady rise in atmospheric carbon dioxide levels measured at the Mauna Loa Observatory. It also displays a seasonal 'zigzag' pattern caused by the photosynthetic cycles of Northern Hemisphere forests.
Which sector is the largest contributor to global greenhouse gas emissions?
- A Transportation
- B Agriculture and livestock farming
- C Manufacturing and industry
- D Electricity and heat production
Correct answer: Electricity and heat production
The burning of coal, natural gas, and oil for electricity and heat is the largest single source of global emissions. Transitioning to renewable energy sources is essential to reduce this footprint.
What is the main concern regarding the thawing of 'Permafrost' in the Arctic?
- A It will lead to a significant decrease in global sea levels.
- B It releases stored methane and $CO_2$, amplifying warming.
- C It will sharply increase the Earth's surface albedo.
- D It will halt the flow of the Gulf Stream in the Atlantic.
Correct answer: It releases stored methane and $CO_2$, amplifying warming.
Permafrost contains vast amounts of ancient organic matter. As it thaws, microbes decompose this material, releasing methane and carbon dioxide, which further accelerates global warming.
The 2015 Paris Agreement aims to limit global warming to well below how many degrees Celsius above pre-industrial levels?
- A 1.0°C
- B 3.5°C
- C 5.0°C
- D 2.0°C
Correct answer: 2.0°C
The Paris Agreement sets a goal to limit warming to well below 2.0°C, while pursuing efforts to limit the increase to 1.5°C. These targets are intended to prevent the most catastrophic impacts of climate change.
How does 'Thermal Expansion' contribute to sea-level rise?
- A Water molecules expand as they freeze into icebergs.
- B The addition of salt to the ocean increases its total volume.
- C Increased evaporation leads to denser, heavier ocean water.
- D Warmer water molecules occupy more space as they heat up.
Correct answer: Warmer water molecules occupy more space as they heat up.
As the oceans absorb about 90% of the excess heat from global warming, the water physically expands. This thermal expansion, along with the melting of land-based glaciers, is a primary driver of rising sea levels.
Which of these is considered a 'Proxy Record' used by scientists to study past climates before weather stations existed?
- A Polar ice cores
- B Satellite imagery
- C Weather balloon data
- D Tide gauges
Correct answer: Polar ice cores
Ice cores contain trapped air bubbles that preserve samples of the atmosphere from hundreds of thousands of years ago. By analyzing the chemistry of the ice and the air bubbles, scientists can reconstruct past temperatures and $CO_2$ levels.
What is the primary greenhouse gas emitted through agricultural activities like rice cultivation and cattle ranching?
- A Chlorofluorocarbons
- B Ozone
- C Sulfur dioxide
- D Methane
Correct answer: Methane
Methane ($CH_4$) is produced by enteric fermentation in livestock and by anaerobic bacteria in flooded rice paddies. Methane is a potent greenhouse gas with much higher heat-trapping ability than $CO_2$.
The 'IPCC' is the leading international body for the assessment of climate change. What does IPCC stand for?
- A Intergovernmental Panel on Climate Change
- B International Protocol for Climate Control
- C Integrated Program for Carbon Collection
- D Internal Policy on Climate Challenges
Correct answer: Intergovernmental Panel on Climate Change
The Intergovernmental Panel on Climate Change (IPCC) provides regular assessments of the scientific basis of climate change, its impacts, and options for adaptation and mitigation.
What occurs during 'coral bleaching' when ocean temperatures rise?
- A Corals expel the symbiotic algae living in their tissues.
- B Corals produce more pigment to protect themselves from heat.
- C Corals grow faster due to increased metabolic rates.
- D Corals dissolve due to the lack of oxygen in warm water.
Correct answer: Corals expel the symbiotic algae living in their tissues.
Stress from high temperatures causes corals to expel the colorful algae (zooxanthellae) that provide them with food. If the stress persists, the coral turns white and eventually dies of starvation.
Which of the following is an example of 'Climate Change Adaptation'?
- A Building sea walls to protect coastal cities from flooding.
- B Replacing a coal-fired power plant with an offshore wind farm.
- C Implementing a carbon tax on industrial emissions.
- D Planting trees to sequester carbon from the air.
Correct answer: Building sea walls to protect coastal cities from flooding.
Adaptation involves adjusting to the actual or expected effects of climate change. Building sea walls is a way to cope with rising sea levels, whereas the other options are examples of mitigation (reducing emissions).
Which gas is primarily responsible for the cooling effect sometimes seen after large volcanic eruptions?
- A Carbon dioxide
- B Sulfur dioxide
- C Water vapor
- D Methane
Correct answer: Sulfur dioxide
Volcanoes emit sulfur dioxide, which forms sulfate aerosols in the stratosphere. These particles reflect incoming sunlight back into space, causing a temporary cooling of the Earth's surface.
The term 'Anthropogenic' in the context of climate change refers to:
- A Natural variations in the sun's radiation intensity.
- B Environmental changes caused by human activity.
- C Climate patterns found in the deep ocean.
- D The study of ancient fossils in the Arctic.
Correct answer: Environmental changes caused by human activity.
Anthropogenic global warming refers to the increase in Earth's temperature specifically caused by human actions, such as burning fossil fuels, deforestation, and industrial agriculture.
Which region of the Earth is currently warming at a rate significantly faster than the global average?
- A The Sahara
- B The Amazon Rainforest
- C The Arctic region
- D The Australian Outback
Correct answer: The Arctic region
This phenomenon, known as 'Arctic Amplification,' is largely due to the loss of sea ice. As ice melts, it is replaced by darker water that absorbs more heat, leading to even faster warming in the polar region.
What is 'Negative Emissions' technology?
- A A way to count emissions that are naturally prevented by rain.
- B Technologies that remove $CO_2$ from the air and store it permanently.
- C A method of improving the combustion efficiency of coal-fired power plants.
- D The reduction of non-$CO_2$ gases like ozone.
Correct answer: Technologies that remove $CO_2$ from the air and store it permanently.
Negative emissions technologies, such as Direct Air Capture (DAC) or Bioenergy with Carbon Capture and Storage (BECCS), actively pull carbon out of the air. These are considered necessary to meet ambitious net-zero targets.