one question
Counts a single question in a test, quiz, interview, or similar setting. Often used with counters or in phrases like 一問一答.
試験は全部で十問あります。一問目は簡単です。
The exam has ten questions in total. The first question is easy.
一問一答形式で進めましょう。
Let's proceed in a question-and-answer format.
I barely managed to solve one question within the time limit.
This test is worth five points per question.
He calmly answered the next question.
質問 is the general word for 'a question' in any context, while 一問 specifically counts a single question as one unit, as in a quiz or exam.
一問 (いちもん, one question) and 一門 (いちもん, a family/clan or school of thought) are pronounced identically but refer to completely different things.
一問 (one question) is pronounced identically to 一文 but means something entirely different, referring to a question rather than money or a character.
question-and-answer format; answering each question in turn
Compound of 一 (one) and 問 (question, problem). The reading いちもん follows standard on'yomi.