Asking questions is very important in the classroom. Not only does it help the teacher with involvement with the students, but it opens up the room to a debate and allows discussion. It is always important to give the students in your class the opportunity to promote curiosity. If they are too intimidated to raise their hand, then how can you know if they are understanding the material?
Everyone has their own ideas about a topic and it's healthy for students to give their opinion. As humans we've been dealing out our opinions for thousands of years and the classroom should be a practicing ground for students to speak their mind.