The legal name of the country, the four nations it contains, and why "Britain" and "the UK" are not interchangeable.
What is the UKLondon, Edinburgh, Cardiff and Belfast — the seats of government for the four nations.
What is the UKHow three saints' crosses combine to form the flag of the United Kingdom — and why Wales is missing.
What is the UKSt George, St Andrew, St Patrick and St David — and the dates each is celebrated across the UK.
What is the UKHow many people live in each nation, the latest census results, and how the population has changed.
What is the UKEnglish, Welsh, Scottish Gaelic, Irish, Ulster Scots and the place each holds in modern Britain.
What is the UKPound sterling, the symbols, the notes and coins, and why Scotland and Northern Ireland print their own banknotes.
What is the UKThe Severn, the Thames, Ben Nevis, Snowdon and Scafell Pike — geographic facts that come up in the test.
What is the UKThe Lake District, the Peak District, Snowdonia and Britain's 15 protected landscapes.
What is the UKBirmingham, Manchester, Leeds, Glasgow and the country's other regional centres.
What is the UKWhy the Channel Islands and the Isle of Man are linked to the King but are not part of the UK.
What is the UKGibraltar, the Falkland Islands and the 14 territories that remain under UK sovereignty.
What is the UKWhy Britain is one of the most ethnically diverse societies in Europe and the modern history that shaped it.
What is the UKChristianity, Islam, Hinduism, Sikhism, Judaism, Buddhism — and the role of the Church of England.
What is the UKEngland's established church, the role of the monarch as Supreme Governor, and how it differs from the Church of Scotland.
What is the UKScotland's national Presbyterian church and how it differs from the Church of England.
What is the UKThe UK's second-largest religion, where it is most concentrated, and how British Muslims practise their faith.
What is the UKThe faith of around one million UK residents, the festival of Diwali, and where British Hindus live.
What is the UKThe faith founded by Guru Nanak, the role of the gurdwara, and Vaisakhi.
What is the UKA Jewish community of around 270,000, the synagogue, Hanukkah and the festivals of the Jewish year.
What is the UKThe faith of around a quarter of a million UK residents, Buddhist temples, and Wesak.
What is the UKA maritime climate shaped by the Atlantic — mild, wet and famously unpredictable.
What is the UKHow the English Channel has shaped British history and how the Channel Tunnel connects Britain to mainland Europe.
What is the UKWhy agriculture only employs about 1% of the workforce yet still shapes the British landscape.
What is the UKBelfast and Derry/Londonderry — the urban heart of the smallest UK nation.
What is the UKCoal, ports, canals and a mild climate — the geography that powered the Industrial Revolution.
What is the UKThe voluntary association of 56 countries with historical ties to Britain, headed by the King.
What is the UKA short history of the UK's membership of the EU, the 2016 referendum, and the post-Brexit relationship.
What is the UKHow the UK is one of five permanent members of the UN Security Council and a founding member of NATO.
Hand-picked guides, explainers and official references our readers ask about most often. We update this list as new resources go live.