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
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.
ace beats all
No. Four-of-a-kind does not beat a flush of any kind.
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.
yes
No, Ace is the highest card in the deck and a two is the lowest.
No.