Giving impromptu question from the teacher is one of the ways to create an interaction between students and teacher. It can help students to be active in learning activities. Questions are the most powerful teaching strategy to enhance interaction in teaching and learning process. This research was intended to investigate the impact of impromptu question from the teacher in teaching and learning process at English Education Department of Universitas Muhammadiyah Yogyakarta (EED of UMY). There were two purposes of this research. The first purpose was to reveal the students experience in giving the impromptu question. The second purpose was to investigate the impacts of impromptu question from the teacher based on the student's perception at EED of UMY. This research was conducted using qualitative research method. The participants were three students who have experience in teaching and learning processes at EED of UMY. The participants are students from batch 2013. They were asked about their experience in the interview. The interview session was recorded, transcribed then analyzed using a coding procedure. This research some ways in giving impromptu question, there are: starting the class, discussing new material, reviewing students’ learning, giving chance for students to share their opinion, and evaluating students’ learning. Then, the researcher investigated students’ perception about the impacts of the impromptu question to answer the second research question. There are positive and negative impacts of impromptu question that are implemented in ii teaching and learning process. The positive impacts of impromptu questions include: motivating students to study at home, understanding more about the subject, having more preparation, and increasing students’ soft skill. In negative impacts of impromptu question, there are three points that showed the feeling of the students: feeling nervous when there is no class preparation, feeling confused when answering questions and feeling afraid of answering the question in English.