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UPSC 2012: Consider the following factors : 1. Rotation of the Earth 2. Air pressure and wind 3. Density of ocean water 4. Revolution of the Earth Which of the above factors influence the ocean currents?
(a)1 and 2 only
(b)1, 2 and 3
(c)1 and 4
(d)2, 3 and 4
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Not attemptedCorrect Answer: (b) 1, 2 and 3
Ocean currents are driven mainly by the Earth’s rotation (Coriolis force), surface winds/air-pressure belts, and horizontal/vertical differences in water density produced by temperature–salinity contrasts. The planet’s revolution around the Sun does not create any force that acts on ocean water, so factor 4 is irrelevant. Hence factors 1, 2 and 3 influence currents. ([testbook.com](https://testbook.com/questions/upsc-world-geography-questions--65cf2568ee035535342b6430?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 2012 Geography question?▼
The correct answer is option (b): 1, 2 and 3. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Oceanography question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 2012, GS Paper 1, as Question 45. It falls under Geography > Oceanography.
What is the difficulty level of this UPSC question?▼
This question is rated "moderate". It requires sound conceptual understanding of the topic.
How many UPSC Prelims questions have been asked from Oceanography?▼
UPSC has asked 21 questions from Oceanography (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.