2 added 40 characters in body
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Yes, this is inassuming 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.

Yes, this is in 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.

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.

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Yes, this is in 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.