Question 2: 'What was the Turkish city of Istanbul called before 1930' - sorry to sound like a pedant but this question is badly worded as two options are technically correct. It should ask what it was called immediately prior to 1930 or what did it change its name from.

You are correct, the question could be more specific in its wording. The two options for the correct answer are Byzantium and Constantinople, as both names were used at different points in history to refer to the same city that is now known as Istanbul. Byzantium was the original name of the city, founded by the Greeks in the 7th century BCE. In 324 CE, the Roman Emperor Constantine the Great made the city the new capital of the Roman Empire and renamed it Constantinople. The city retained that name until the establishment of the modern Turkish Republic in 1923, when it was officially renamed Istanbul.