📘 Geography Optional – Objective Paper I (Prelims)
Page–9 : Oceanography & Marine Geography (PYQs with Answers)
Q1. The deepest part of the world’s oceans is:
A) Tonga Trench
B) Java Trench
C) Puerto Rico Trench
D) Mariana Trench
✅ Answer: D) Mariana Trench
Q2. Which layer of the ocean is most productive biologically?
A) Abyssal zone
B) Bathyal zone
C) Pelagic zone
D) Euphotic zone
✅ Answer: D) Euphotic zone
Q3. Ocean currents are primarily caused by:
A) Salinity differences only
B) Earth’s rotation only
C) Wind, temperature and density differences
D) Tides
✅ Answer: C) Wind, temperature and density differences
Q4. Which ocean current warms the western coast of Europe?
A) Labrador Current
B) Canary Current
C) Gulf Stream
D) Benguela Current
✅ Answer: C) Gulf Stream
Q5. El Niño is associated with changes in:
A) Indian Ocean only
B) Atlantic Ocean only
C) Pacific Ocean circulation
D) Arctic Ocean circulation
✅ Answer: C) Pacific Ocean circulation
Q6. The phenomenon of upwelling is important because it:
A) Raises sea level
B) Increases salinity
C) Brings nutrient-rich waters to surface
D) Causes cyclones
✅ Answer: C) Brings nutrient-rich waters to surface
Q7. Which ocean has the highest average salinity?
A) Pacific Ocean
B) Atlantic Ocean
C) Indian Ocean
D) Arctic Ocean
✅ Answer: B) Atlantic Ocean
Q8. Tsunamis are mainly caused by:
A) Cyclones
B) Volcanic eruptions on land
C) Submarine earthquakes
D) Strong ocean currents
✅ Answer: C) Submarine earthquakes
Q9. Which sea is known for the highest salinity?
A) Caspian Sea
B) Black Sea
C) Red Sea
D) Baltic Sea
✅ Answer: C) Red Sea
Q10. Continental shelves are important because they:
A) Are deepest parts of oceans
B) Have high fishing potential
C) Prevent tsunamis
D) Cause ocean currents
✅ Answer: B) Have high fishing potential
✅ End of Objective Paper–I | Page–9
Oceanography & Marine Geography Covered
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