Polls are an excellent way to break up online teaching and add some interactivity to your session. Zoom has tools for polls in their paid version and Google Meet will be adding features to their Enterprise version. There are also 3rd-party tools that allow you to conduct polls.

Third-Party Polls

NOTE: I haven't tested these. As always, give these apps a try in order to choose the one that best suits what you are trying to achieve.

Mentimeter - http://www.mentimeter.com/

Polls Everywhere - https://polleverywhere.com/ - free for up to 25 participants