Geography · Standard Time, GMT & World Time Zones
The concept being tested: Longitudinal extent of nations and International Date Line.
Consider the following countries: I. United Kingdom II. Denmark III. New Zealand IV. Australia V. Brazil How many of the above countries have more than four time zones?
The count of time zones must include every dependency and outlying territory a country administers, not just its contiguous mainland. The United Kingdom, Denmark, New Zealand and Australia each cross this four-zone threshold: the UK through territories such as the British Indian Ocean Territory and Pitcairn Islands, Denmark through Greenland's several offsets and the Faroe Islands, New Zealand through the Cook Islands, Niue, Tokelau, the Chatham Islands and the Ross Dependency, and Australia through Lord Howe Island's half-hour offset plus external territories like Norfolk Island and the Australian Antarctic Territory. Brazil, however, uses exactly four zones, from UTC-5 in Acre to UTC-2 at Fernando de Noronha, so it does not clear the "more than four" bar. That leaves four qualifying countries, matching Only four.
What UPSC was testing
UPSC is testing whether aspirants count only a country's mainland time zone or correctly extend the count to overseas territories and outlying islands, since it is exactly those dependencies that push the United Kingdom, Denmark, New Zealand and Australia past four while Brazil, with no such territories, stays capped at four.
How often this comes up
This concept has appeared 3 times in UPSC Prelims General Studies Paper I between 2015 and 2025 — in 2018 and 2025.
The option-by-option autopsy for this question — why each of the other three is wrong, and which neighbouring concept each one was built from — is in the app.