Post Office GK Quiz Questions is an free online section of PO system. This quiz provides you the knowledge by which you can face your PO interview and also can get good marks in PO competitive examination and entrance tests. Know how PO system worked before the advent of postal and ZIP codes. Know the cool and interesting PO facts. This quiz also has the basic general knowledge PO questions that every person should know. Know about for which countries PIN codes are written in begining. Where is first mailbox of world ? In which country, the world’s highest post office is located ? Which country has most widely distributed post office system ? What is the official language of Universal Postal Union ? Did you know that private mail service was legalized in England in 1635. Just after this in 1650's, the term "post office" has been used in the same country. Did you know that Pin Numbers were first introduced in Ukraine in December 1932. Check your knowledge about the various Mail services of world by playing this quiz trivia. Score high in this quiz and place your name in the home page of BriskInfo. The name will be displayed who has a high grand total in all quiz sections.