As a native speaker of Northeastern US English, I would normally only add please after a question if I was asking for a specific favor or for an object from the person I am questioning.
Can you pass me that wrench, please?
Could you let me know when he arrives, please?
But it is not used when asking simple factual questions, matters of opinion, or idiomatic phrases:
Has he arrived yet, please?
Do you like those new tools, please?
How are you, please?
To put it briefly, "please" is used when one asks a question which solicits a favor. In the questions that have been struck out, one solicits a piece of information (and not a favor).