A position analysis questionnaire is basically a very special kind of paper that helps people figure out what kind of work they do and what sort of skills they need for their job. It's like a quiz that asks lots of questions about how you spend your time and what kind of things you do.
For example, imagine you work in a store. The questionnaire might ask about how much time you spend stocking shelves, helping customers, and working the cash register. Then it might ask about what kind of skills you need, like being able to count money or lift heavy boxes.
By answering all these questions, the people in charge can understand better what kind of work you do and what kind of skills are really important for your job. This way, they can make sure that you have the support and resources you need to do your job well.