问 is a phono-semantic compound written with the 口 (kǒu) "mouth" character inside the 门 (mén) radical. 问 is a common Chinese character found in many words related to the action of asking, such as: 问题 (wèn tí) “Question”, 问津 (wèn jīn) “Show Interest”, 询问 (xún wèn) “ask” and 访问 (fǎng wèn) “to Interview”.
The Chinese idiom 问一知二 (wèn yī zhī èr) “ask one, know two”, means the more you ask, the more you know and is used to describe a wise, well-informed person.