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UPSC 1999: If it is 10.00 a.m. I.S.T., then what would be the local time at Shillong on 92°E longitude?
(a)9.38 a.m.
(b)10.38 a.m.
(c)10.22 a.m.
(d)9.22 a.m.
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Not attemptedCorrect Answer: (b) 10.38 a.m.
Indian Standard Time (IST) is based on 82.5° E. Shillong at 92° E is 9.5° east of the IST meridian. Every degree of longitude represents 4 minutes of time, so the local time is 9.5 × 4 = 38 minutes ahead of IST. Therefore, when it is 10:00 a.m. IST, Shillong’s local time is 10:38 a.m.—option (b). ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-1999-solved-question-paper/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 1999 Geography question?▼
The correct answer is option (b): 10.38 a.m.. 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 1999, GS Paper 1, as Question 3. It falls under Geography > Astronomy & Earth–Sun System.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
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.