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Logic 101 Practice Test: Informal Fallacies
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An informal fallacy is a defect in the content of an argument, rather than the form. To identify an informal fallacy, you need to pay attention to the meaning of the content.  Here are some examples of informal fallacies: False dilemma: A false dilemma is when something is falsely claimed to be an "either/or" situation, when in fact there is at least one additional option. Slippery slope: The slippery slope fallacy suggests that an action will trigger a chain of events and culminate in a subsequent unwanted event. Appeal to ignorance: An appeal to ignorance is when an argument is taken as... Show more
Logic 101 Practice Test: Informal Fallacies
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25 Questions

1. The idea that fast food is unhealthy is a lot of hooey. Why, 90% of America eats fast food.
2. If cleaner cars are produced, then there will be fewer greenhouse gasses. There will be fewer greenhouse gasses. Therefore, cleaner cars will be produced.
3. Either Honda or Nissan makes the Altima. But it isn't Honda. Therefore Nissan makes the Altima.
4. Philosopher Peter Singer argues for the right to kill handicapped newborn babies. But Singer is a disgusting irreligious crypto Nazi who is sometimes described as the most dangerous man in the world today. Obviously his arguments are nonsense.
5. The U.S. has a right to eradicate dictatorships wherever it finds them. Dictators crush the right of self governance given by God to all of his children. Dictators suppress liberty and freedom. They sacrifice the lives of their people to satisfy their own corrupt aims and desires. Dictators are vile monsters! They embody the power of Satan wherever they dwell. Down with dictatorships everywhere!
6. This cherry pie is delicious. Therefore, every ingredient in this pie is delicious.
7. Harry shouldn't be thrown out of college for cheating. He's been on academic probation for the past year, and this has caused terrible stress. The poor guy hasn't been able to sleep at night, he can't keep his food down, and he's constantly sick with worry about his future. Surely you can find it in your hearts to give him a second chance.
8. The Bible is unquestionably true because deep in my heart I feel that it is.
9. Aspirin is an analgesic drug, and it is appropriately purchased over the counter. Morphine, like aspirin, is an analgesic drug. Therefore, it would be appropriate that morphine be available over the counter.
10. Every component in this boat is made of rust-proof material. Therefore, the entire boat is rust-proof.
11. My dear, you shouldn't hesitate a minute before buying a new mink coat. Real fur is in right now, and a full mink is the ultimate in fashion. It tells the whole world that you have exquisite taste and the financial means to express it.
12. A spokesman for the government has argued that our insistence on a twelve percent increase in pay for steel workers is inflationary. But the government's own actions are far more inflationary than ours. The government just gave a fifteen percent increase to every single employee of the giant federal bureaucracy.
13. Sylvia is a wonderful ice skater. But every ice skater is a person. Therefore, Sylvia is a wonderful person.
14. Shortly after retiring from his job, Mr. Lopez had a heart attack and died. The same thing happened to Mrs. Harris. I think the message is clear: Whatever you do, never retire from your job.
15. In a random poll of 400 students from Belview College, 72 percent said that they own a digital camera. Therefore, probably most Belview students own a digital camera.
16. Nobody has ever proved that the ready availability of guns causes an increase in the number of murders and robberies. Hence, we conclude that the availability of guns has no effect on the frequency of these crimes.
17. Jordan argues against alcohol abuse in fraternities. What a hypocrite! When Jordan was a student he was the biggest binge drinker on campus. His arguments are a joke.
18. The sign on the restaurant wall says 'No Smoking Rules Enforced.' Therefore, we can probably smoke, since the smoking rules aren't enforced.
19. Professor Harris gives a number of reasons why we should turn off our cell phones during class. It appears that Harris is one of those Luddites who are opposed to technology altogether. No laptops, no iPods, no digital camerasthat's what Harris wants. But that's just ridiculous. Thus, it's clear that Harris is wrong.
20. You should never buy your child a goldfish, because next it will be a hamster and then a rabbit. After that the kid will scream for a cat, and then a dog. Next it will be a horse, then a water buffalo, and finally an elephant. The cost of pet food will drive you to the poor house.
21. Witness Clark testified that he saw the defendant emerge from the burgled house with an expensive camera. But, members of the jury, you should reject this testimony because Clark suffers from brain damage, and he has trouble remembering things accurately.
22. Professor Wilson argues that it is absolutely wrong for students to plagiarize their work. But who is she to talk? I have it on good evidence that Wilson plagiarized her own work when she was a student.
23. Eddie, one of your friends was asking about you the other day. He wanted to know if you were still having sex with 14-year-old girls. What should I tell him the next time I see him? Are you still doing it?
24. Poor Scooter Libby should never have been sent to jail for lying to a grand jury. Scooter is an honorable man. He devoted his whole life to working for his country. One administration after another asked for his help. And Scooter was always there, ready to serve. Scooter deserved a medalnot jail time.
25. The Northern Express railway train is headed north. Therefore, every car on that train is headed north.

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