The clock is maintained by a certified NFL official. He or she takes cues to start and stop the clock from the referee.
Yes. Not only does the clock stop for touchdowns, but for any score.
5 YARD PENALTY
After the first down the clock doesn't not stop running.
i think so
No. Not in the NFL, only in college football
There is an official timekeeper at each NFL game and he coordinates with the referees.
No, unless there was a penalty or a player went out of bounds.
No. That's only a college-football rule.