Yeah
Yes.
No, a hand with 2, ace, king, queen, and jack is not considered a straight in poker because it does not have five consecutive cards in numerical order.
Yes, Jack, Queen, King, Ace, 2 is not considered a straight in poker. A straight in poker is a sequence of five consecutive cards in any suit.
yes. it also beats any "3 of a kind"
ace wins
ace beats all
An ace-high straight flush, otherwise is known as a royal flush, is beat only by five of a kind. This is only possible in games with wildcards.
No. Four-of-a-kind does not beat a flush of any kind.
yes
It depends on the game. Which cards 'beat' others will be defined by the rules of the card game, whichever it is. Many games do not use the joker at all. Others, such as Canasta, treat it as a wild card. In Euchre, it is the highest ranked card.
No.
yes