A question-and-answer format in which each question is answered in turn; Q&A.
授業では先生が学生に一問一答で確認していった。
In class, the teacher checked the students by asking questions one by one.
面接は一問一答形式で進められた。
The interview proceeded in a question-and-answer format.
テレビのクイズ番組で出場者が一問一答で問題に答えた。
Contestants on the TV quiz show answered the questions one by one.