Sunrise in eastern Arunachal Pradesh would be about how many hours before the sunrise in western Gujarat?
- A.One hour
- B.Two hours
- C.Three hours
- D.Four hours
Correct answer
Explanation
The correct answer is B, Two hours. India stretches across about 30 degrees of longitude, and every degree makes a difference of four minutes in local time.
India's longitudinal extent is from about 68°7' E in western Gujarat to about 97°25' E in eastern Arunachal Pradesh, a span of nearly 30 degrees. The Earth turns 360 degrees in 24 hours, that is one degree in four minutes. So 30 degrees means about 120 minutes, and the Sun rises in eastern Arunachal roughly two hours before it rises in western Gujarat. To avoid such differences, India uses a single Indian Standard Time based on the 82°30' E meridian, which passes near Mirzapur in Uttar Pradesh and is 5 hours 30 minutes ahead of GMT.
A is wrong: one hour would mean only about 15 degrees of longitude, half of India's span. C is wrong: three hours would need about 45 degrees. D is wrong: four hours would need about 60 degrees, far more than India's width.
Exam tip: One degree of longitude equals four minutes; India spans about 30 degrees, so about two hours; IST is set on 82°30' E.
Practice Questions
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- A.3-4-1-2
- B.4-2-1-3
- C.3-4-2-1
- D.2-3-4-1
Show answer
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