As with any production line, Tesla sometimes requires its employees to perform repetitive tasks. While remaining an equal opportunity employer regardless of disability, the interviewer is trying to determine if you will be a top performer while enduring physically challenging work. Additionally, they've taken considerable measures to ensure they "evolved the way we define safety, developed internal tools to drive execution, actively sought worker improvement suggestions, and established a more structured EHS&S audit program to identify safeguards and drive operational excellence throughout all areas of the business." Be honest with the hiring manager about any limitations you might have. Be confident and positive about your willingness to perform and put in your all.