Which of the following DOES require a nazirite to perform the impurity shaving?
An olive-sized piece of corpse flesh is one of the twelve sources that require the nazirite to shave and restart (Halachah 2).
Question 2
A nazirite contracts tzara'at during his vow. What happens to his nazirite days?
All days of isolation and the seven days of post-purification counting are invalidated — his nazirite count resumes only after the second tzara'at shaving (Halachah 9).
Question 3
A nazirite and a kohen encounter an abandoned corpse with no one to bury it. Who should become impure?
The nazirite must become impure to bury the met mitzvah. The kohen's impurity prohibition is Rabbinic in this case while the nazirite's is Biblical, but the met mitzvah takes precedence (Halachah 13).
Question 4
Two nazirites — one with 30 days remaining and one with 100 days — encounter a met mitzvah. Who should become impure?
The one with fewer remaining days should become impure — he loses less of his completed vow time (Halachah 14).
Question 5
A nazirite touches utensils that were touching a corpse. Must he perform the impurity shaving?
Touching utensils in contact with a corpse does not require the nazirite to shave or restart his count (Halachah 8).