Correct Answer: (d) Addis Ababa (Ethiopia)
Solution:London, Lisbon and Accra in Ghana are close to Greenwich Meridian. But, Addis Ababa is Situated on the eastern part of Africa (i.e., longitude 38.74 E). So, Addis Ababa has a different clock time than that of London, Lisbon and Accra.
Standard Time is the time that is set uniformly within a region by law or general usage. It is calculated using the mean solar time at the time zone's central meridian. A time zone is an area of the earth where consistent standard time should be maintained for commercial, social, and transportation needs. The world time zone was formed by relating longitude and the rotation of the earth. The Prime Meridian is the centre of the time zone, extending from 7% W and 7% E longitudes.
Number of Time Zones: The 24-hour time zone system was developed so that all the time zones should be referred to in terms of Greenwich Mean Time (each zone for one hour of the day).
Time Zone Adoption: Some nations have more than one standard time because of their extensive longitudinal history. For example, France has the most time zones (13), primarily due to its various territories around the world.