Regarding project plan,charter,closing process

1,Where we update project plan?

2.What is the next step after project charter

a.identify risks or Project scope statement

3.Differrence between quality control and quality assurance

4.In direct and indirect cost of projects which cost is constant and which one changes?

5.What is the final out come of Cause and effect diagram

a.Minor cause or mean cause or root cause

6.What is differnce beteern primary,seconday and internal,external stock holders

7.what is the out of closing process

admis closure or lessen learned

Please answer above questions