It can be a follow up to fulfilling other requirements such as spending a certain amount of time in the country to qualify for applying for citizenship.
Among European countries, written citizenship tests are in place in the UK, Netherlands, Austria, Denmark, Estonia, Germany, Latvia, and Lithuania.
According to a 2018 survey by the Institute for Citizens & Scholars, less than one third of Americans could pass a multiple choice citizenship test, with the majority of respondents failing to choose the correct number of Supreme Court justices and the opponents of the United States in World War II.
[5] The Australian citizenship test consists of 20 multiple-choice questions, 15 of which must be answered correctly to pass, and has been in place since 2007.
After the written test, applicants do a face-to-face interview with an Australian Immigration and Border Protection officer.