Formal Logic Quiz 3
1. According to our text, Modus Tollens is:
a) the claim that if something implies another, then in the presence of that thing (i.e. the antecedent) the other thing (i.e. consequent) must occur.
b) the claim that an affirmation of the antecedent must result in an affirmation of the consequence.
c) the claim that a denial of the antecedent permits us to deny, infer or deduce the denial or negation of the consequent.
d) the claim that an affirmation of the consequence must lead to an affirmation of the antecedent.
e) none of the above.
2. According to our text, you commit the fallacy of affirming the consequence, when you:
a) claim that a denial or negation of the consequence permits us to deny or infer/deduce the denial or negation of the antecedent.
b) claim that if one of the disjuncts (components) in a disjunction (either-or statement) is false, then the other must be true.
c) claim that an affirmation of the consequence must lead to an affirmation of the antecedent.
d) claim that if something implies another, then in the presence of that thing (i.e. the antecedent) the other thing (i.e. consequent) must occur.
e) do none of the above.
3. According to our text, "If you have HIV, you will get AIDS; and if you get AIDS, you will die. So if you have HIV, you will die." is an example of:
a) Modus Ponens.
b) Modus Tollens.
c) a Disjunctive Syllogism.
d) a Hypothetical Syllogism.
e) none of the above.
4. ABC News 20/20 reports on 10/20/99 that the use of cell phones is sufficient for getting cancer; but you don't use cell phones, so you should not be concerned that you'll get cancer.
a) This argument, above, is valid.
b) This argument, above, is invalid.
c) This argument, above, is neither valid nor invalid.
d) This sentence, above, is not an argument.
e) None of the above is correct.
5. A federal advisory panel today urged college and university freshmen to get vaccinated against bacterial meningitis, a rare infection that can kill a healthy person within hours; because if they are vaccinated, it is effective against most strains of meningococcal meningitis that circulate in the United States, and we want to fight effectively against these forms of bacterial meningitis. (Atlanta, Oct. 20 1999)
a) This argument, above, is valid.
b) This argument, above, is invalid.
c) This argument, above, is neither valid nor invalid.
d) This sentence, above, is not an argument.
e) None of the above is correct.
Go back to Quiz Page: Page of Quizzes