Yes, you can mark survey question as required.
1. While adding Survey Question in select Tickets section make sure to check mark box under Required field.
2. Click on save to apply changes.
Now in registration page survey question will be marked as required.
In Case,if you don’t want to mark survey question as required,
1. Edit survey question
2. Right next to ticket under Required uncheck box.
3. Click on save to apply changes.