Most of these quizzes have a preamble to help the reader answer the questions.
This topic is just too voluminous to summarize in a paragraph or two, so you're on your own! I've written a whole book about it here.
Just click on the questions listed below and see how you do!
You might also consider getting Larry's book on Defense HERE or try Larry's Defense Webinar series which you can find HERE.
You're West and you hold:
87 
AK 
Q7654 
8762
What would you lead after this auction?
West North East South 1 Pass 2 Pass 4 Pass Pass Pass Choose One:1. -8
2. -A
3. -K
4. -8
5. -5
Answer: 3K
. When leading from ace-king doubleton, we reverse the order (normal lead against suit contacts is the ace from ace-king).Your result so far:You're West and you hold:
KQ2 QJ108 J2 Q874
What would you lead after this auction?
West North East South 1NT Pass 3NT Pass Pass Pass Choose One:1. -K
2. -Q
3. -8
4. -4
Answer: 2Q
. Safer than the KYour result so far:You're West and you hold:
Q32 82 J986 7653
What would you lead after this auction?
West North East South 1 1 2 Pass 4 Pass Pass Pass Choose One:1. -A
2. -J
3. -Q
4. -2
Answer: 42
. Lead partner's suit and low from three with honor.Your result so far:You're West and you hold:
J102 32 Q1087 Q765What would you lead after this auction?
West North East South 1 1 2 Pass 4 Pass Pass Pass Choose One:1. -2
2. -J
3. -7
4. -2
5. -5
Answer: 2J
. The normal card from a J10 "sequence."Your result so far:You're West and you hold:
Q9832 542 7654 2
What would you lead after this auction?
West North East South 1 1NT Pass 3NT Pass Pass Pass Choose One:1. -5
2. -3
3. -2
4. -6
Answer: 23
. Here, your suit is more tempting than partner's. Hope he doesn't have KQJ109 and a side ace. "Didn't you see me bid clubs?"Your result so far:You are West and you hold:
K54 32 AQ1082 742
What would you lead after this auction:
West North East South 1 Pass 1 Pass 2 All Pass Choose One:1. -42. -33. -A4. -A club
Answer: 4A club. When the opponents are playing in the declarer's second bid suit, you want to lead a trump unless you have a very very good reason not to. Here, you want to make sure declarer can't ruff diamonds in dummy.
Your result so far: