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The correct answer is option (b): a large wheel with earthen pots tied to the outer ends of its spokes. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
This question was asked in UPSC CSE Prelims 2025, GS Paper 1, as Question 13. It falls under Ancient History > Science & Technology.
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
UPSC has asked 7 questions from Science & Technology (under Ancient History) across multiple years. Visit the topic page to see the full list and year-wise trends.