You do read your Soaring Magazine, I hope?
September issue. Answers are: Question 1: C; Question 2: C; Question 3: E; Question 4: D.
Answer Question 5: D. Th e optimum bank angle and airspeed to lose the least amount of energy (altitude) in a completed turn for ALL gliders is 45ยบ of bank and an airspeed equal to the level flight minimum sink speed (for the current operating weight) plus 18.9% ( approximately 20%).
If you don’t still have your copy you can read it here. https://magazine.ssa.org/viewer?y=2021&m=9&p=38&o=0&q=
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Stay tuned for more brain teasers to come.
Steve