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1.
Which is not an officially-recognized U.S. Federal holiday?
2.
Which is not an officially-recognized U.S. Federal holiday?
3.
Which is not an officially-recognized U.S. Federal holiday?
4.
Which is not an officially-recognized U.S. Federal holiday?
5.
Which is not an officially-recognized U.S. Federal holiday?
Birthday of Martin Luther King, Jr.
✓
6.
Which is not an officially-recognized U.S. Federal holiday?
7.
Which is not an officially-recognized U.S. Federal holiday?
8.
Which is not an officially-recognized U.S. Federal holiday?
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Which is not an officially-recognized U.S. Federal holiday?
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Which is not an officially-recognized U.S. Federal holiday?
11.
Which is not an officially-recognized U.S. Federal holiday?
You should really remove this one as both answers ARE correct - an ambiguity like this where no one without access the the Office of Personal Management could be expected to know what's written there and where the two names both refer to the VERY SAME holiday not different days (and you know it) is a trifle vindictive don't you think? (I'd also question your use of the city name "Colombo" in your capitals quiz - it's still the exact same city it was before and is still the capital).
To be honest, it was the Presidents' Day/Washington's Birthday paradox that gave me the idea for this quiz. While I wouldn't necessarily characterize the inclusion of this question as "vindictive," I can certainly see how it could be considered a trick question. Therefore, not wanting to alienate my tens of fans, I have gone ahead and removed "Presidents' Day" from this quiz entirely.
Your second point regarding the inclusion of "Colombo" in the Spot the Imposter - World Capitals quiz is equally valid and I have now removed it as well.
These two questions can now join the "Nambia/Gambia/Zambia" question from my Spot the Imposter - Countries of the World #1 quiz as banished questions. Perhaps if I get enough of those I can put together a rouge's gallery of my worst "Spot the Imposter" questions.