You can use Kahoot to do multiple choice quizzes, polls, or discussions. Plus there are several thousand Public Kahoots that have already been shared that you can grab and use immediately with your students. I recommend you preview them first because some are a little PG-13 for students. They also have a seach filter to look for public kahoots.
Kahoot works on computers, iPads, iPods, and Smartphones. The teacher sees the question and the multiple choices. The students only see the four answer colors and a corresponding shape to choose by shape or color. Kahoots work best with an Interactive Board so the students can see them well. If you are using a public Kahoot, the teacher loads and starts the quiz and students enter the waiting room. Students login to kahoot.it and then enter a nickname. Once everyone is logged in at the waiting room, the teacher begins the Kahoot. You can add timers to the questions or just move on when everyone is finished. Try it out. My students beg to play Kahoot!