If it is 12.00 Noon in India, on which meridian will it be 7.00 am of the same day ?
- A.7.5 degree E. Longitude
- B.7.5 degree W. Longitude
- C.75 degree E. Longitude
- D.75 degree W. Longitude
Correct answer
Explanation
The correct answer is A, 7.5 degree E. Longitude. Indian Standard Time is based on 82.5° E, and a place 5 hours behind lies 75° to the west of it, at 82.5° − 75° = 7.5° E.
The Earth turns 360° in 24 hours, so local time changes by one hour for every 15° of longitude, or four minutes per degree. Noon in India and 7 am at the other place differ by 5 hours. Five hours equal 5 × 15° = 75°. Since the other place has an earlier time, it lies to the west of India's standard meridian, which passes near Mirzapur in Uttar Pradesh. Moving 75° west from 82.5° E brings us to 7.5° E, a meridian that passes through parts of Europe and Africa.
B is wrong because 7.5° W would be 90° west of IST, or six hours behind. C is wrong because 75° E is only 7.5° from IST, a difference of 30 minutes. D is wrong because 75° W is more than ten hours behind India.
Exam tip: 15° = 1 hour, 1° = 4 minutes; IST meridian 82.5° E is 5 hours 30 minutes ahead of GMT.
Practice Questions
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