Socrative is a tool for assessing students by the uses the following formats:
Teacher access: https://www.socrative.com/
Student access: https://b.socrative.com/login/student/
Overview video of Socrative
(2 min 00 secs)
7 minute tutorial on how to create a quiz.
Create a quiz by uploading the questions from a spreadsheet.
(3 min 17 secs)