If your voice assistant can connect to your home security system (both Alexa and Gemini for Home usually can), then you can ask them if your security system is armed or not. That's useful if you aren't at home and someone is making a surprise visit to your house, or if you are arming your system manually and can't remember if it's on or not.
This is a useful question when you're installing or upgrading any kinds of smoke detectors in your home, whether a single device or a DIY security system. I found certain voice assistants were better than others at this question. Gemini for Home was the most useful, tapping into a government site and giving specific information on exactly where the state required homes to install smoke alarms. In fact, Gemini's summary was so long first-time users might find all the info overwhelming, which is why it may be helpful to use a web search for a question like this. Siri gave some helpful info, but