This topic is covered here.
This is the corresponding quiz.
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After this start, which (if any) of the shown hands are appropriate for 1NT by South?
West North East South (You) Pass 1 
1 
1NT 1)
Q1054 
54 
Q1032 KJ2
2)
A2 K765 Q432 765
3)
87 Q102 K732 K765
4)
AJ2 Q5 108765 J42
Choose One:1. -None of them
2. -All of them
3. -Only one of them
4. -Two of them
5. -Three of them
Answer: 4Two of them -- #1 and #4
#1- Normal 1NT bid with spades stopped
#2 - Better to use a Negative Double to show the 4 hearts
#3 - No Spade stopper (I would raise to 2 as the least of evils)
#4 - 1NT is the best description (more accurate than 2)Your result so far: -
After this start, which (if any) of the shown hands are appropriate for 2NT by South?
West North East South (You) Pass 1 1 2NT 1)
542 A5 Q1032 KQ32
2)
K2 KJ65 Q102 Q1097
3)
A876 Q102 K7 Q765
4)
AJ2 KQ5 Q765 Q42
Choose One:1. -None of Them
2. -All of Them
3. -1 of Them
4. -2 of Them
5. -3 of Them
Answer: 3Only Hand #2 is acceptable.
#1) This hand is better suited to a diamond raise (cuebid 2 or raise to 3--however your partnership shows an invitational raise). This is a better description than 2NT with only Ax as a stopper and great diamond support.
#2) Perfect.
#3) A Negative Double with 4 spades is a better choice.
#4) Too strong for an invitational 2NT. The correct bid is 3NT.Your result so far: -
After this start, which (if any) of the shown hands are appropriate for 3NT by South (nobody vulnerable)?
West North East South (You) Pass Pass 3 3NT? 1)
A105 K4 Q103 AKQJ9
2)
AQ42 K765 A AK87
3)
AKQ Q1032 32 KQJ9
4)
K Q52 K5 AKQ9875
Choose One:1. -All of Them.
2. -None of Them.
3. -1 of Them.
4. -2 of Them.
5. -3 of Them.
Answer: 4Hands #1 and #4 are appropriate for a 3NT overcall.
#1) Sure, you'll need something in dummy to make it, but with 19HCP and a diamond stopper, you are the one to bid notrump.
#2) Sure, you have diamonds stopped, but a Takeout Double is the correct action.
#3) No diamond stopper. Make a Takeout Double.
#4) Yes--3NT. If you don't bid it, who will? A good partner will have just enough help (and even if he doesn't, the opponents might no find the right defense).Your result so far: -
After this start, which (if any) of the shown hands are appropriate for 2NT by South?
West North East South (You) Pass 1 Pass 1 Pass 2 Pass 2NT? 1)
Q10543 K2 32 J1087
2)
AKJ7 KJ5 Q32 865
3)
KQJ1087 Q102 32 K5
4)
AQJ92 A5 J105 J42
Choose One:1. -All of Them.
2. -None of Them.
3. -1 of Them.
4. -2 of Them.
5. -3 of Them.
Answer: 2None of Them.
#1) Too weak. Just pass 2.
#2) Too strong. Bid 3NT.
#3) Too spade-oriented. Bid 3 Invitational.
#4) Too strong and too wrong. Bid the 4th suit (2) and await developments (you can always bid notrump later).Your result so far: -
None vul. After this start, which (if any) of the shown hands are appropriate for 3NT by South?
West North East South (You) 2 2 3 3NT 1)
Q1054 A4 Q1032 872
2)
A2 KQ10 Q432 K865
3)
Q7 A2 KJ932 K1065
4)
J2 K5 J8765 K842
Choose One:1. -All of Them
2. -None of Them
3. -1 of Them
4. -2 of Them
5. -3 of Them
Answer: 3One of Them (#2)
#1) A raise to 3 is the best choice.
#2) 3NT is perfect.
#3) 3NT is possible, but with a shaky stopper and nice suit playability, a Responsive Double is best.
#4) Not enough for anything but a Pass.Your result so far: -
With which of these hands is it ok to open 1NT?
1)
Q10982 J2 AJ10 AK2
2)
AQ KJ53 AQ872 32
3)
54 K82 AK AJ8765
4)
KQ1098 AJ54 K8 K5
Choose One:1. -All of Them
2. -None of Them
3. -1 of Them
4. -2 of Them
5. -3 of Them
Answer: 53 of Them (1, 2 and 3).
Reminder: Opening 1NT does NOT promise stoppers in every suit.
1. Sure, we have 15 points and a balanced hand. We run into a rebid problem if we open 1
. 2. Yes, we have a rebid problem again if we open 1
and partner bids 1 or 1NT. 3. Yes, 1NT is a better description than opening 1
and jumping to 3. We wouldn't be happy playing 3 opposite a small singleton if partner has a 5 or 6 card major. 4. No, we don't have a rebid problem here. If we open 1
, we can rebid 2 later or make a game try if partner raises. Your result so far: