Multiple choice general knowledge

Which one of the following longitudes determines the Indian Standard Time?

  1. 85.5° E

  2. 82.5° E

  3. 84.5° E

  4. 86.5° E

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Indian Standard Time (IST) is calculated from 82.5° E longitude, which passes through Allahabad (Prayagraj). This meridian was chosen as it corresponds to the mean longitude of India, 5.5 hours ahead of GMT.