The Question and Answer section for An Inspector Calls is a great resource to ask questions, find answers, and discuss the novel.
The Inspector's tone is open and inquisitive.... it might be seen as accusatory.
A middle-class family sits around a table, having just enjoyed a satisfying dinner, and the maid clears the table. The scene sets the expectation that this is going to be a family drama, maybe even a comedy, and the focus will be on this happy...
I'm sorry, I'm not quite sure what you mean. Birling should answer the Inspector thoroughly and honestly, including all details. He might want to speak with him privately if he is uncomfortable with his family and guest present.