On the lesson you would like to edit, select “Add Slide”, then select “Add Activity”. You will see an array of different activities you can include in your lessons. Select “Quiz”.
Give your quiz a title. Type in the questions and answers. You can move the order of the questions by dragging and dropping them.
Once you've added the questions and answers, click on the box right next to an answer to mark it as the correct one. You can mark more than one as correct. Hit “Save”.
Note that quizzes are automatically graded in your report.
Note: If you do not want to select any correct answers, then you should create a Poll. You can learn how to make one here.