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Q56
(IAS/1994)
Geography › Maps & Locations › Geographical lines and coordinates
Answer Verified
When it is noon along 82° 30' E longitude along what degree of longitude it will be 6.30 am ?
Result
Your answer:
—
·
Correct:
C
Explanation
82°30′E is the Indian Standard Meridian and is 5 hours 30 minutes ahead of Greenwich Mean Time (GMT = 0°) [1]. If it is 12:00 noon at 82°30′E, the time at Greenwich will be 5.5 hours earlier, i.e. 06:30 a.m. The relationship between longitude and time is 15° per hour of time difference; 5.5 hours equals 5.5 × 15° = 82.5° or 82°30′, which is exactly the difference between 82°30′E and 0° longitude [2]. Therefore, when it is noon at 82°30′E, it is 6:30 a.m. at 0° (Prime Meridian). Option 3 is correct.
Sources
- [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 18: Latitudes and Longitudes > Indian Standard Time > p. 245
- [2] Exploring Society:India and Beyond. Social Science-Class VI . NCERT(Revised ed 2025) > Chapter 1: Locating Places on the Earth > Understanding Time Zones > p. 20
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