This paper presents an analysis of multiple questions which occurred in Korean oral proficiency interviews. The data for the analysis of multiple questions come from a corpus of approximately two hours of Korean oral proficiency interview questions and tasks. Attention is placed on the sequential places of multiple questions with the goal of identifying functions of both vertical multiple questions, and horizontal multiple questions. Horizontal multiple questions are reveled to be placed delicate situation where the possibility of misunderstanding or mishearing may be high. In this case, to elicit an appropriate answer from the interviewee, the interviewer presents horizontally arranged subsequent question versions. Vertical multiple questions are in contrast revealed to be placed according to immediate interviewee's uptake.