Be strong in what you have mentioned in resume. They go into depth if you are certified and have intern or project project experience in few technologies. It finally depends on the knowledge that is possessed by panel member. i got a person who is very good at frond end web dev so asked few difficult questions in html and css. Also asked to write code for few operations on webpage in html css and js. So, be carefull with what you mentioned in your resume. Even you are strong in other topics, there will chance to loose if u r not good answering what you have mentioned resume.