In Scrabble if you use all your letters to make up a word, do you get an extra points?
Yes, assuming you have a full hand of seven tiles. From the rules:


  BINGO! If you play seven tiles on a turn, it's a Bingo. You score a premium of 50 points after totaling your score for the turn.


If you have fewer than 7 tiles at the end of the game, playing them all doesn't get you this bonus.