UPSC CSE Prelims
Latitude and Longitude Previous Year Questions (PYQs)
Practice solved questions for Latitude and Longitude with detailed step-by-step solutions, key insights, and trend analysis for UPSC CSE PRELIMS.
Solved Previous Year Questions
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Consider the following statements:
I. Anadyr in Siberia and Nome in Alaska are a few kilometers from each other, but when people are waking up and getting set for breakfast in these cities, it would be different days.
II. When it is Monday in Anadyr, it is Tuesday in Nome.
Which of the statements given above is/are correct?
Detailed Explanation:
Correct Answer: ✅ Option 1 (I only)
Anadyr (Russia) and Nome (Alaska, USA) are located on opposite sides of the International Date Line (IDL). Although they are geographically close, crossing the IDL results in a change of calendar date. Therefore, people in these cities can experience the same part of the day but on different dates.
✅ Statement I is Correct: Anadyr and Nome are separated by the International Date Line, so they can have similar clock times but different calendar dates.
❌ Statement II is Incorrect: Anadyr is ahead of Nome. If it is Monday in Anadyr, it would still be Sunday in Nome, not Tuesday.
Short Notes: International Date Line (IDL)
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The International Date Line lies roughly along 180° longitude.
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Crossing the IDL from west to east subtracts one day.
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Crossing the IDL from east to west adds one day.
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The IDL is not perfectly straight; it bends to avoid splitting countries and island groups.
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Russia and Alaska are separated by the Bering Strait and the IDL.
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Places close to each other geographically can have different calendar dates due to the IDL.
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The IDL is important for global travel, communication, and timekeeping.
Among the following cities, which one lies on a longitude closest to that of Delhi?
Detailed Explanation:
Answer: Option 1 — Bengaluru
Delhi is located at approximately 77.10°E longitude, and among the given options, Bengaluru (77.59°E) lies closest to this longitude with a difference of only about 0.49°. Hyderabad (78.49°E), Nagpur (79.09°E), and Pune (73.86°E) are all farther away from Delhi's longitude.
📝 Short Notes: Longitudes of Major Indian Cities
| City | Longitude | Difference from Delhi |
|---|---|---|
| Delhi | 77.10°E | - |
| Bengaluru | 77.59°E | 0.49° |
| Hyderabad | 78.49°E | 1.39° |
| Nagpur | 79.09°E | 1.99° |
| Pune | 73.86°E | 3.24° |
- Bengaluru and Delhi nearly share the same longitudinal line, making them closest in east-west positioning.
- Pune lies significantly west of Delhi, while Hyderabad and Nagpur lie progressively east.
- Understanding longitude positions helps in determining time zones and relative geographical positioning of cities.
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