Socrative is a multiplayer quiz application that allows users to log in either from a computer or mobile device and compete in races or just practice quizzes. A community teaching account has already been created and can be used by navigating to:

https://b.socrative.com/login/teacher/

And using the login information below.

Username: admin@sfdcstudy.org

Password: SFstudytime

Only one teacher from your group should be active at any given time. Select the activity you would like to do and select the question bank you would like to use. Once you are ready have your friends join you at:

https://b.socrative.com/login/student/ and enter the room ID:  15JSR5DL

As the teacher just start the quiz.