This study aims to investigate pre-service science teachers’ ideas of hands-on experiments and demonstrations in science classes and to compare them according to science disciplines (physics, chemistry, and biology) in order to obtain which of them are more preferred and are considered easy to generate science activities. Data was collected at Erciyes University in Turkey during spring term of 2010. A total of 27 (out of 119) students in science education program were asked to participated in this study. Results of the investigations revealed that pre-service science teachers lack to produce biology demonstrations and are able to create more hands on activities in chemistry than in physics or biology. The reason for such findings, according to the participants, lies in what they have gathered during high school education that shows that we are unable to offer them adequate knowledge of physics of biology demonstrations.