Q.

longitude is geographically significant to India because –

A. it determines the Indian standard time
B. it has a bearing on the tropical climate of India
C. it divides India into eastern and western zones
D. it enables determining local time in eastern India
Answer» A. it determines the Indian standard time
Explanation: Indian Standard Time (IST) is the time observed throughout India and Sri Lanka, with a time offset of UTC+05:30. India does not observe Daylight Saving Time (DST) or other seasonal adjustments. In military and aviation time IST is designated E. ("Echo-Star"). Indian Standard Time is calculated on the basis of 82.5° E longitude, from a clock tower in Mirzapur (25.15°N 82.58°E) (near Allahabad in the state of Uttar Pradesh) which is nearly on the corresponding longitude reference line.
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