Yes, this is a pretty standard PMM interview question. When I ask, I am typically looking to see if the candidate understands product launch and go-to-market fundamentals. I'm also interested in which parts of the launch they led (i.e. was it a specific marketing channel or soup-to-nuts?).
I also like to ask different variations of this question, like "tell me about a product launch that did not go well and you had to get back on track" because let's be honest, not every launch goes exactly the way we plan :)
Well, the question of "What is Product Marketing" Could mean different things at different companies, but my answer is that we provide the voice of the market and the voice of the customer internally to the product manager so we can build products that resonate with our audience, and we are the voice of the product externally providing the appropriate messaging and positioning to go to market.