Would you pass an introductory logic class?

The great philosopher and mathematician Rene Descartes is quoted as saying: "Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have." Similarly, most people believe they have a fully adequate understanding of basic logic and reasoning, yet many studies have shown that the majority of people often fail even the most elementary logic tests.

I suppose you consider yourself to be an exception to this rule. Do you have what it takes? Can you spot a logical fallacy on sight? Do you know the difference between a valid argument and a sound argument? The results of this quiz will give you an indication of whether you could indeed pass an introductory logic course.

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1. Suppose the statement "Disco sucks" is true. Which of the following statements is necessarily untrue?
Disco does not suck.
Disco does not suck or New Wave is awesome.
Disco sucks and rock is dead.
I can't decide which is more wrong!
2. Which of the following is a logical contradiction?
It is raining and it is not raining.
Pigs can fly or birds can play poker.
It is Monday or it is not Monday.
What's a contradiction?
3. Given the premise, "Nobody likes to eat brussels sprouts", which of the following is a valid deduction?
Nobody eats brussels sprouts.
Nobody likes to eat brussels sprouts and pigs can fly.
Everyone does not like to eat brussels sprouts or pigs can fly.
What's a deduction?
4. Given the premises "Elvis is living" and "Elvis is not living", which of the following is a valid conclusion?
Pigs can fly.
Elvis is awesome.
If it's not Scottish, it's crap.
All of the above.
None of the above.
I still don't know what a deduction is.
5. Suppose it is the case that everyone on planet Golibor has either blue hair or green hair. Which of the following is necessarily true?
If Gelgamar is an Golibor, then Gelgamar has blue hair.
Everyone with green hair is from Golibor.
Goliborians are dead sexy.
There exists no Goliborian whose hair is neither blue nor green.
All of the above.
6. Suppose it is the case that nobody who hates The Venture Bros. is cool. Which of the following necessarily follows?
If Jim hates the Venture Bros. then Jim is not cool.
If Lisa is not cool then Lisa hates The Venture Bros.
If Jessica is cool then Jessica does not hate The Venture Bros.
If Conrad does not hate the Venture Bros. then Conrad is cool.
A and C only.
B and D only.
7. If the sun rose late, then it rained this morning. If this is true, then what is necessarily not true?
The sun rose late and it rained this morning.
The sun did not rise late and it rained this morning.
The sun did not rise late and it did not rain this morning.
The sun rose late and it did not rain this morning.
8. If you drink coffee, then you have coffee fever. If this is true, which of the following is a valid conclusion?
If you have coffee fever then you drink coffee.
If you don't drink coffee, then you don't have coffee fever.
You don't drink coffee or you have coffee fever.
You have coffee fever and you're going to die.
You don't have coffee fever and pigs can fly.
9. Suppose it is snowing if and only if it is cold outside. Which of the following could logically be the case?
It is cold and it is not snowing.
it is not cold and it is snowing.
It is not cold and it is not snowing.
It is cold and it is snowing.
All of the above.
C and D only.
10. If it is between 1 and 6 am then I am asleep, unless it is a Saturday. Which of the following could you logically deduce?
If I am asleep, then it is between 1 and 6 am.
If I am asleep, then it is not a Saturday.
If it is a Saturday, then I am not asleep.
I must be stay up late on Friday nights.
None of the above.
11. Consider the following argument: War is wrong unless it is approved by the UN. If war is initiated by the US, and the UN has not approved it, then people are justified in demonstrating against the US. The UN has not approved war. Therefore, people are justified in demonstrating against the US and opposing all war. Is this a valid argument?
Yes.
No.
I have no idea... when did politics come into it?
12. President Bush broke the law if he ate raw babies. But he didn't eat raw babies. Consequently, he didn't break the law. Is this a valid argument?
Yes.
No.
I think it is in my best interests to remain silent with regards to my political views.

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