Court rules on Section 336 and Hobby Drone registration
This week (5/19/17) A court ruled that section 336 of the 2012 FAA Authorization does not allow the FAA to impose hobby aircraft user registration or fines for failure to register. The FAA is likely to appeal the decision.
However, "correct" answers on the FAA exam relating to hobby drone registration requirements and fines will remain as before until or if FAA changes the exam. Keep that in mind when taking the FAA Remote Pilot Certification test.