One of my favorite sayings is, “Unspoken expectations are unmet expectations.” If you want participants to ask questions, take notes, engage in conversation, etc. communicate those expectations prior to the call, and again at the beginning. Zoom calls really seem to clam people up, so encourage them to break out of their shell. If it suits the tone of your meeting, consider adding incentives. For example, if this is a training meeting, host a quick trivia round at the end. Winner gets a Starbucks gift card, half day Friday, or some company swag!