Nebraska Cornhuskers
the Florida gators
There was no official "NCAA Football Championship" though #1 Texas defeated #2 Navy 28-6 in the Cotton Bowl to win the 1963 national championship by virtue of the AP and UPI polls.
No, Temple has never won a NCAA National Championship.
If you mean NCAA championship game, and if you mean in division 1, sorry to say, there is no such thing. The NCAA does not have a championship format in Div. One. They leave it to bowls and polls. If you mean the POLL championship back in the early nineties, that kind of doesn't count either, because of the fifth-down play against Mizzou. Sorry.
1939
The Florida Gators defeated the Florida State Seminoles 52-20 to win the 1996 NCAA National Championship.
No team every team lost at least 1 game
Oklahoma in 2000 ranked 19
Yes
Yes
North Dakota State (NDSU) won the NCAA Division I Football Championship on January 10, 2015 by a score of 29 to 27. The game was against Illinois State and was played in Frisco, Texas.