This isn't exclusive to Persians. South Asians ask the obvious questions like are you going out? When they hear the door open, or did you come home? when opened from outside. Are you reading, eating, watching TV, etc.
I have another one. Every time I was about to leave home, my mom would ask: where are you going son? And I'd answer: I'm going outside mom. And she'd be satisfied by this answer! 😂