Hot Question activity plugin is just updated to a new version for Moodle 2.7 and allows you to collect questions from students in and out of classroom.
Hot question activity can be used by the teacher to let the students post questions/feedback or suggestions about the course which can be rated by other students. The post getting maximum votes will float at the top of the list giving you the popular questions at a glance.
The best thing about the Hot question activity is that the students can even post the question as an anonymous user making it easier to ask their queries and post quality feedback.
You can download the latest version of the Hot Question activity from the Moodle plugins database here – https://moodle.org/plugins/mod_hotquestion
What are the other ways you are using to get feedback from your students? Do let us know in the comments below.