The basis of deciding the standard time of any place is–

The Indian Standard Time Meridian does not pass through

How much is the difference between Indian Standard Time (I.S.T.) and Greenwich Mean Time (G.M.T.)?

Which one of the following longitudes is the standard meridian of India ?

Standard Indian Time (Meridian Longitude 82° 30') passes through which of the following towns?

The local time of a place is 6.00 AM when the Greenwich Mean Time (GMT) is 3:00 AM, what is the longitude of the place?