Selecting Students To Answer
Name students at random.
Use lollipop sticks with names on them.
Use the random name picker iPad app.
Methods
You don't just have to think about questioning, in the immediate Q and A way it might mostly be used.
Consider how you might use questions to promote discussions within small groups. For less confident learners, this method can work well as students are given the chance to discuss their answers with someone else before they respond to the whole class. It also enables wider interpretations to be explored.
Take a look at this video and set of activities to learn about questioning in a more active way.
http://teachertools.londongt.org/?page=questioningTechniques