There will usually be 5 or 6 questions, of which 2 or 3 are directly related to your job, with the rest being how to organize your work, how you communicate with your boss and colleagues, how to react in some tricky situations. Remember to answer AS MUCH AS POSSIBLE. The interviewers are not allowed to prompt you to speak, and will not give you hints if you miss anything. Just remember, government interviews are not really interviews; rather they are oral response to examination questions, i.e. you sit for an exam but instead of writing down the answer, you just say them orally. It does not matter if you answer too much. In fact, the more detailed the better.