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Q58 (CDS-I/2021) Geography › Maps & Locations › Geographical lines and coordinates Answer Verified

Which one of the following longitudes is the standard meridian of India ?

Result
Your answer: —  Â·  Correct: B
Explanation

The standard meridian of India is 82°30' E longitude [2]. This specific longitude was selected because it lies roughly in the middle of the country's longitudinal extent, which stretches from approximately 68°7' E to 97°25' E [3]. By adopting this central meridian, India maintains a uniform time across the nation, preventing a two-hour time lag between the easternmost parts of Arunachal Pradesh and the westernmost parts of Gujarat [1]. The meridian passes close to Mirzapur in Uttar Pradesh [1]. Internationally, standard meridians are often chosen in multiples of 7°30' of longitude, and 82°30' E fits this criterion [1]. Consequently, Indian Standard Time (IST) is exactly 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT) [2].

Sources

  1. [1] INDIA PHYSICAL ENVIRONMENT, Geography Class XI (NCERT 2025 ed.) > Chapter 1: India — Location > INDIA – LOCATION > p. 2
  2. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 18: Latitudes and Longitudes > Indian Standard Time > p. 245
  3. [3] https://www.britannica.com/science/Indian-time-zone
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