Oceanography – Geography Optional PYQs (1995–2026)

Here are all 60 Oceanography questions asked in UPSC Geography Optional Paper I from 1995 to 2026, arranged under the 8 topics of the official syllabus. Within each topic the latest questions come first.

Each question ends with a code such as [2024/15m/3b] – the year, the marks, the word limit (where UPSC set one) and the question number in the paper.

3.1] Bottom topography of the Atlantic, Indian and Pacific Oceans

10 questions

1. How are seamounts and Guyots the same and different? Comment. [2026/10m/150w/1c]

2. With suitable sketches elaborate the bottom topography of the Indian Ocean. [2024/15m/2c]

3. Give a detailed account of bottom topography of the Pacific Ocean. [2021/15m/2b]

4. Describe the configuration of the Pacific Ocean floor. [2017/15m/2c]

5. Explain the scientifically sound methods of bathymetry and give an account of the bottom topography of the Atlantic Ocean. [2010/30m/4a]

6. Discuss the mid-Atlantic Ridge in terms of its origin, extent and relief. [2004/60m/4]

7. Present a concise account of bottom relief of the Indian Ocean. [2003/60m/4]

8. Write a short note on: Submarine canyons. [1999/20m/200w/2b]

9. Explain and illustrate the submarine relief of the Atlantic Ocean. [1998/60m/5]

10. Explain and illustrate the ocean floor topography and give a detailed account of the Mid-Atlantic Ridge. [1996/60m/5]

3.2] Temperature and salinity of the oceans; heat and salt budgets

6 questions

1. Discuss the hazards associated with rise of sea-surface temperature. [2021/10m/150w/1c]

2. Write a short note on: Different layers of ocean water above abyssal plain. [2012/12m/150w/1e]

3. Write a short note on: Salinity patterns in Indian Ocean. [2011/12m/150w/1c]

4. “Temperature, salinity and density differences in ocean water are the prime causes of ocean water circulation.” Elaborate. [2011/30m/4a]

5. Comment on marine heat budget and the oceanic Circulation system. [2009/30m/3b]

6. Write a short note on: T-S diagram. [2000/20m/200w/5a]

3.3] Ocean deposits

4 questions

1. Describe the characteristics of different types of pelagic deposits. [2015/10m/150w/1c]

2. Write a short note on: Ocean deposits. [2010/15m/200w/1b]

3. Discuss the different bases for classifying the ocean deposits and give a detailed account of pelagic Deposits of the Oceans. [2007/60m/3]

4. Write a short note on: Pelagic deposits. [2004/20m/200w/5b]

3.4] Waves, currents and tides

13 questions

1. Discuss the potential consequences of the collapse of the Atlantic Meridional Overturning Circulation (AMOC) for the world. [2026/15m/2b]

2. What are the fundamental differences among ocean wave, ocean current and tide? [2025/10m/150w/1e]

3. How are ocean currents generated? Discuss their effects on coastal climates with special reference to the Pacific Ocean. [2023/15m/2c]

4. What is the relationship between ocean currents and global surface wind systems? Explain with examples how does the gyre in the Northern Hemisphere differ from the one in the Southern Hemisphere. [2022/15m/2c]

5. Explain the currents of the North Atlantic Ocean and their significant role in the climate of Western Europe. [2020/15m/2c]

6. How are ocean waves formed? Distinguish between a wave of oscillation and a wave of translation. [2019/15m/4c]

7. Discuss the impacts of ocean currents on air mass behaviour. [2017/10m/150w/1c]

8. “The relationship between the winds and the currents is best seen in the Indian Ocean.” Justify. [2016/15m/3b]

9. Illustrate the origin and nature of Sargasso Sea and Lagoon. [2014/10m/150w/1e]

10. Differentiate Storm Surges and Seiches. [2013/10m/150w/1b]

11. “Temperature, salinity and density differences in ocean water are the prime causes of ocean water circulation.” Elaborate. [2011/30m/4a]

12. Comment on marine heat budget and the oceanic Circulation system. [2009/30m/3b]

13. Write a short note on: Ocean currents of Northern Atlantic Ocean. [2006/20m/200w/5d]

3.5] Marine resources: biotic, mineral and energy resources

10 questions

1. What is deep-sea mining? What are the potential benefits and risks associated with it? [2025/15m/2b]

2. What is ocean ranching? How are aqua-cowboys related to such activities? [2023/10m/150w/1b]

3. Give an account of marine resources and their economic significance. How has marine pollution affected such resources? [2023/20m/4a]

4. Marine resources are economically very significant. Discuss citing suitable examples. [2020/10m/150w/1c]

5. Describe the potential marine energy resources with reference to their benefits, harvestibility and environmental impacts. [2018/20m/4a]

6. Bring out the various ecological problems associated with the exploitation and use of oceans and their resources. [2016/20m/4a]

7. Analyse the reasons for a comparatively poorer development of fishing grounds in tropical areas. [2013/15m/250w/7b]

8. Examine economic significance of the resources of the Continental Shelf of the Indian Ocean. [2009/30m/3a]

9. Write a short note on: Marine resources, biotic, mineral and energy resources. [1997/20m/200w/2b]

10. Write a short note on: Food from the sea. [1995/20m/200w/2c]

3.6] Coral reefs, coral bleaching

9 questions

1. When corals are affected by stress it causes them to turn completely white. Explain the reasons of such an occurrence. [2022/10m/150w/1d]

2. Discuss the concept of coral bleaching, its recovery and macroalgal regime shifts due to this process. [2020/15m/2b]

3. Distinguish between low energy coasts and coral coasts. [2017/10m/150w/1b]

4. Give an account of recent observations on coral bleaching with reference to Clive Wilkinson’s Report. [2014/15m/4c]

5. Compare the Subsidence and Glacial control theories on the formation of coral reefs. [2013/25m/400w/4a]

6. “Atolls present the most challenging explanation in the evolution of coral reefs.” Discuss. [2012/20m/250w/4c]

7. Describe the ideal conditions for coral reef formation and discuss the glacial control theory of coral reef formation. [2008/60m/4]

8. Write a short note on: Formation of coral reefs. [2001/20m/200w/5d]

9. Examine critically the theories of the formation of coral reefs and atolls. [1997/60m/5]

3.7] Sea-level changes

3 questions

1. Comment on: With suitable examples explain the factors causing sea level changes. [2024/10m/150w/1c]

2. Describe the causes and consequences of sea level changes. [2018/10m/150w/1c]

3. Write a short note on: Eustatic changes of Sea-level. [2007/20m/200w/5c]

3.8] Law of the sea and marine pollution

5 questions

1. Give an account of marine resources and their economic significance. How has marine pollution affected such resources? [2023/20m/4a]

2. Maritime security is being neglected. Indicate the major challenges and suggest solutions in the context of Law of the Sea. [2021/15m/3b]

3. Discuss Maritime Zones. [2016/10m/150w/1c]

4. Bring out the various ecological problems associated with the exploitation and use of oceans and their resources. [2016/20m/4a]

5. Give a critical account of reasons and consequences of marine pollution. [2014/15m/3c]

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Last updated: 30 October 2026