Indian Standard Time (IST) is ahead of Greenwich Mean Time (GMT) by _______.

Correct option is D

Correct Answer: (d) 5 h, 30 min
Explanation: Indian Standard Time (IST) is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT). IST is calculated based on the 82.5°E longitude, which passes through the city of Mirzapur in Uttar Pradesh. This longitude is chosen because it lies approximately in the middle of India, ensuring a uniform time standard for the entire country.
Key Facts about IST:
· IST is the official time zone of India.
· The 82.5°E longitude corresponds to a time offset of +5:30 hours from GMT.
· IST does not observe daylight saving time.
· The time difference remains constant throughout the year.
Information Booster:
· Greenwich Mean Time (GMT) is the reference time zone from which all other time zones are calculated.
· India's time zone falls in the UTC+5:30 offset.
· The concept of IST was officially adopted on 1 January 1906.
· Neighboring countries such as Sri Lanka also follow the same time offset as IST.
· The IST longitude (82.5°E) runs close to Mirzapur, ensuring that IST is centrally located for the entire country.