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.

Created by: Athena
  1. Suppose the statement "Disco sucks" is true. Which of the following statements is necessarily untrue?
  2. Which of the following is a logical contradiction?
  3. Given the premise, "Nobody likes to eat brussels sprouts", which of the following is a valid deduction?
  4. Given the premises "Elvis is living" and "Elvis is not living", which of the following is a valid conclusion?
  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?
  6. Suppose it is the case that nobody who hates The Venture Bros. is cool. Which of the following necessarily follows?
  7. If the sun rose late, then it rained this morning. If this is true, then what is necessarily not true?
  8. If you drink coffee, then you have coffee fever. If this is true, which of the following is a valid conclusion?
  9. Suppose it is snowing if and only if it is cold outside. Which of the following could logically be the case?
  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?
  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?
  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?

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