That depends completely on contestant knowledge. Most categories are easy to experts on the subjects and hard for people with little knowledge of the category.
The final Jeopardy category was New Sportsnew sportsNew Sports is the Jeopardy final category for April 12 2010New Sports is the Jeopardy final category for April 12 2010
Opera was the final Jeopardy category
The final Jeopardy category was Toys
The final Jeopardy Category was Sainthood
The Final Jeopardy category for August 10 2010 was Architecture
The Final Jeopardy category was Historical Phases
The final Jeopardy category was Telecommunications Terminology
The Final Jeopardy category for September 17 2010 was Rivers
Celebrity namesCelebrity Names is the Jeopardy Final Category for April 7 2010.
Animated MoviesAnimated Movies was the final jeopardy category on March 24 2010Animated Movies was the final jeopardy category on March 24 2010
The Final Jeopardy category for June 17 2010 was Americana
The Final Jeopardy category for July 7 2010 was Geography