Unfortunately, most employers rely heavily on the interview rather than a hands on assessment of the skill required for the job. Yes, they are looking for reactions, but this is usually the only time your potential future boss will get to make an assessment of your job skills. Technical knowledge may be what they are looking for, or it could be the Human Resources department conducting the interviews, in which case they may no know any of the technical aspects of the job. Every company seems to do it differently.

If you technical knowledge is good, but you have trouble with the interview process, I would suggest some practice with friends. There are numerous web sites which are designed to help job seekers with interviewing and contain typical questions. Have your friends interview you, and get them to be tough on you. This is good rehearsal and will build confidence.

Next, go to more job interviews. You may not get the job, but the experience with the various processes used by different companies will also aid in confidence building. The education you will gain from this is priceless.

When answering questions, be direct and answer confidently. Do not "stare" into their eyes. Be polite and professional and do not come across as antagonistic, regardless of the questions asked. The interviewers have only a short interview to find out if you can do the job, will fit in with the company, didn't lie on your resume and that you will not be a liability to the company. While it may seem like a game, hiring good people is critical to any company. It is a shame that they rely so heavily on a short interview.