This article presents a compatibility analysis of search engines with the acquiring knowledge process. The motivation was determine the possibility of inconsistencies between results' selection criteria adopted by these tools and cognitive learning aspects. It was sought to identify the physiological and psychological processes that occur when we are acquiring knowledge and then it was evaluated possible inconsistencies with the search engines operations. As a result of research, it was noticed that popularity use in hierarchization of results diverges from cognitive characteristics of users and may impose difficulties for new knowledge acquisition.