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UPSC 1997: If the earth's direction of rotation is reversed, what would be the IST when it is noon at the International Date Line?
(a)06.30 hrs
(b)05.30 hrs
(c)18.30 hrs
(d)17.30 hrs
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Not attemptedCorrect Answer: (c) 18.30 hrs
At present IST (82.5 ° E) is 5 h 30 m behind the local time at the International Date Line (180 °). If Earth’s rotation were reversed, time would progress in the opposite longitudinal order, making IST 6 h 30 m AHEAD of the Date Line. Hence, when it is 12:00 at the IDL, IST would read 18:30. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-1997-solved-question-paper/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 1997 Geography question?▼
The correct answer is option (c): 18.30 hrs. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Astronomy & Earth–Sun System question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1997, GS Paper 1, as Question 64. It falls under Geography > Astronomy & Earth–Sun System.
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 Astronomy & Earth–Sun System?▼
UPSC has asked 27 questions from Astronomy & Earth–Sun System (under Geography) across multiple years. Visit the topic page to see the full list and year-wise trends.