If you plan on using a large question bank with lots of simply-formatted questions such as multiple choice or true/false, you can streamline the process by importing them directly from a text file.
Moodle is very particular about the format of imported files. You need to follow the Aiken format precisely when creating your document. You must also save the file as a plain text file with UTF-8 encoding. A Word document will NOT work. Read more about the Aiken format.