You don’t need to seem perfect in the interview to get hired. Don’t try. Be human!
If you seem fake, or if you try too hard to give “perfect” answers, the hiring manager might not be able to get a real sense of what your strengths and weaknesses are. And if they can’t tell, that will prevent you moving forward in the interview process.
An interviewer may ask how you perceive his company's position in its industry, who the firm's competitors are, what its competitive advantages are, and how it should best go forward. For this reason, avoid trying to thoroughly research a dozen different industries. Focus your job search on just a few industries instead.
Employers judge you heavily based on the questions you ask. Running out of questions before you’ve met everyone, or saying, “I don’t have any questions,” can cost you the job.
Asking “bad” questions can cost you the job too. Do your research and ask questions that will show your strength and not your weakness.