The Indian Standard Time (IST) remains how much ahead from Greenwich Mean Time (GMT) ? 

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  1. 05½ hours
  2. 06 hours
  3. 05 hours 
  4. More than one of the above
  5. None of the above

Answer (Detailed Solution Below)

Option 1 : 05½ hours
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Detailed Solution

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The correct answer is '05½ hours ahead of GMT'.

Key Points

  • Indian Standard Time (IST) and Greenwich Mean Time (GMT):
    • Indian Standard Time (IST) is the time observed throughout India and Sri Lanka.
    • IST is calculated from the Allahabad Observatory, located at 82.5° E longitude.
    • Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London.
    • IST is exactly 5 hours and 30 minutes ahead of GMT.
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