The article on this topic is here.
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Which (there is only one) auction below by South guarantees a balanced hand (4-3-3-3, 4-4-3-2 or 5-3-3-2):
A)
West North East South Pass 1 
Pass 1NT B)
West North East South Pass 1 
Pass 1NT C)
West North East South Pass 2 
Pass 3NT D)
West North East South Pass 1 Pass 3NT Choose One:1. -A
2. -B
3. -C
4. -D
Answer: 4D) None of the first 3 auctions guarantee a balanced hand.
Your result so far: -
Which (there is only one) auction below by South guarantees a balanced hand (4-3-3-3, 4-4-3-2 or 5-3-3-2):
A)
West North East South 1 3 Pass 3NT B)
West North East South 3 3 Pass 3NT C)
West North East South Pass 3 Pass 3NT D)
West North East South Pass 1 Pass 3NT Choose One:1. -A
2. -B
3. -C
4. -D
Answer: 4D) -- A raise to 3NT (assuming it isn't conventional) shows a balanced hand (no singletons or voids).
In A), the 3NT bidder could have, say: KQ108 KJ1087 Q 
AQ2.
In B), the 3NT bidder could have, say: 3 KQ10 KQJ107 J1096.
In C), the 3NT bidder could have, say: K2 -- AKQJ10876 QJ3.
Your result so far: -
With which hand (only 1) should South bid 2NT in this auction:
West North East South 1 Pass 1 2 Pass 2NT 1)
J1093 KQ54 A 7642?
2)
K1076 Q653 J1096 2?
3)
KQ7 Q1076 KJ2 1093?
4)
J10982 K876 K42 2?
Choose One:1. -Hand 1
2. -Hand 2
3. -Hand 3
4. -Hand 4
Answer: 3#3 is a perfect 2NT bid.
#1 is better suited for a raise (via a 2
or 2 cuebid)
#2 and #4 are not strong enough.Your result so far: -
Identify the one (only one) auction below where South could easily be unbalanced (no jokes, please):
1)
West North East South 2NT 2)
West North East South 1 Pass 3NT 3)
West North East South 2 Pass 3NT 4)
West North East South 1 Double Pass 1NT Choose One:1. -Hand 1
2. -Hand 2
3. -Hand 3
4. -Hand 4
Answer: 3On Hands 1,2 and 4, South should be balanced.
On Hand 3, South could easily have something like:
2 KQJ KQJ1098 AK10.
Your result so far: -
On this auction:
West North East South 1 1 ? With which hand below (only 1) should you, South, bid 3NT?
1)
KJ98 A32 QJ87 K2?
2)
KJ KJ93 AJ107 J32?
3)
QJ6 QJ6 QJ76 Q54?
4)
A K32 KQ108765 Q43?
Choose One:1. -Hand 1
2. -Hand 2
3. -Hand 3
4. -Hand 4
Answer: 2With #1, A negative double is better.
With #3, South isn't strong enough for 3NT
With #4, South is unbalanced and should bid 2Your result so far: -
With which hand below should you, South, bid 2NT.
None vulnerable. The auction starts:
West North East South 1 2 ? 1)
KQ1093 4 AJ5 KJ32
2)
Q105 54 KQ1092 KJ103)
98 A76 Q9852 AJ10
4)
A73 4 10876 KQ1087
Choose One:1. -Hand 1
2. -Hand 2
3. -Hand 3
4. -Hand 4
Answer: 22. 2NT on this auction shows 11-12 with a club stopper. Only hand 2 fits that description. With 1, you should bid 2
. With hand 3, you should make a cuebid raise of hearts by bidding 3. On hand 4, you should pass, hoping partner balances with a takeout double. This is sometimes called a penalty pass or trap pass. Your result so far: