Question 1
(1) South makes the first bid.  The dealer always makes the first bid.

Question 2
(2) West declares.  The first person in a partnership to bid a particular strain plays the hand if that strain becomes the final contract.

Question 3
(3) North makes the opening lead.  The player that makes the opening lead is the one that sits to Declarer's left.

Question 4
(4) North-South, playing in a major suit, make 120 points below the line for making the contract and 30 above the line for their one overtrick.

Question 5
(1) North-South make 100 points below the line for making 3NT, 90 points for three overtricks above the line, and 700 points for having won the second game of a "fast rubber" (a rubber in which the opposing side won no games).

Question 6
(2) 4 is the required contract to make game.  Each trick bid and made in a successful major suit contract is worth 30 points, thus 4 beats the game requirement by 20 points.

Question 7
(4) East-West make 100 points for defeating the doubled contract by one trick.

Question 8
(4) 4X is worth the most because a doubled contract doubles the points scored below the line and givers bonuses for overtricks above the line if successful.  In this case making the contract is worth 240 points below the line.  Other hands would score more points above the line for making slam.

Question 9
(1) The doubled contract doubles the value of tricks below the line for 40 points, each overtrick taken is worth 200 points for being vulnerable above the line, and 50 points are awarded above the line for making a doubled contract.

Question 10
(3) 40 points are scored below the line for making 1NT.  However, this gives them the total 100 points for game, and since the opponents have not won a game, 700 points for a fast rubber is added to the winning side's total.