Kim Belknap is doing a presentation for our social studies in-service later this week on PollEverywhere which allows the teacher to quiz students using a phone (doesn't have to be a smartphone) or a laptop. Above is how you do it. Kim has also created a how-to sheet here.
Another way to quiz students is using Quizlet which lets students create flashcards for smartphones or laptops or you can use the many ones others have created. Just search for your topic and your type of test.
Quizlet for Teachers from Quizlet on Vimeo.