Socrative is maybe not the best of names but it offers some useful tools to tutors to use in a class. At the beginning you can have some quizzes for them to do -
On logging in the tutor is allocated a 'room' number. Students enter that on their devices and will then get to see the quiz or whatever that is provided there. A nice feature is the way that the teacher can display the live results of the quizzes and also have them sent as a spreadsheet by e-
and it expects students to include their name as Surname, First name which, together with the title, says something about the team behind this! I guess the way people enter names can be changed, though, and may just be a demo thing. t.socrative.com and m.socrative.com are the mobile sites for tutors and students respectively. You can play around yourself with two devices and pretend to be a student or get the wife and kids to help check that it all works as you want.
It seems to work on a pc or mobile device quite happily with a clear interface actually best viewed on a mobile as the content tends to stretch across a normal screen and look a bit strange.
There are additional options for creating quizzes using a template that can be downloaded so the tutor can take their time setting up more detailed quizzes and answers in their own time rather than on-
It hasn't the most intuitive of interfaces -