Hi Giancarlo @SongieGP
No, you cannot (if I understand your question correctly); Circle Selecting Objects, doesn’t change the Active Object.
Same thing in Edit Mode, if you have an Active Vertex (or Edge, or Face), that will remain the Active Vertex (Edge/Face) when you use Circle Select and if there is no Active Vertex to begin with, Circle Select will not create one.
This will become important later on, because some Operations depend on having an Active Vertex.