Question 1

"All dogs are diseased.John is a dog.Therefore,John went to the vet." Which of the following is true of the preceding argument?

Accepted Answer

A)  The argument is false. 
B)  The argument has a false conclusion because it has at least one false premise. 
C)  The argument is not deductively valid. 
D)  The argument is sound. 
A)  The argument is false. 
B)  The argument has a false conclusion because it has at least one false premise. 
C)  The argument is not deductively valid. 
D)  The argument is sound. C

Question 2

Which of the following is an example of a categorical syllogism?

Accepted Answer

A)  "If you take that road, you'll end up lost. So don't take that road." 
B)  "All men are mortal. Socrates is a man. Therefore, Socrates is mortal." 
C)  "Every crow I have ever seen is black. Therefore, all crows are black." 
D)  None of these answers is correct. 
A)  "If you take that road, you'll end up lost. So don't take that road." 
B)  "All men are mortal. Socrates is a man. Therefore, Socrates is mortal." 
C)  "Every crow I have ever seen is black. Therefore, all crows are black." 
D)  None of these answers is correct. B

Question 3

If a valid deductive argument has a true conclusion,then it must have all true premises.

Accepted Answer

A) True 
 B)False  False

Question 4

Which of the following is the primary concern of logic?

Accepted Answer

A)  truth 
B)  winning arguments 
C)  validity 
D)  All of these are equally of concern to logic. 
A)  truth 
B)  winning arguments 
C)  validity 
D)  All of these are equally of concern to logic.

Question 5

All deductive arguments have fewer than four premises.

Accepted Answer

A) True 
 B)False

Question 6

The following argument is valid: "If the moon is made of cheese,then we can eat the moon.We cannot eat the moon.Therefore,the moon is not made of cheese."

Accepted Answer

A) True 
 B)False

Question 7

Syllogisms are deductive arguments with two premises and a conclusion.

Accepted Answer

A) True 
 B)False

Question 8

Valid deductive arguments guarantee the truth of their conclusions.

Accepted Answer

A) True 
 B)False

Question 9

If an argument contains a premise that is just a definition,then the argument is invalid.

Accepted Answer

A) True 
 B)False

Question 10

Which of the following is a valid categorical syllogism?

Accepted Answer

A)  "Some animals are mammals. John is an animal. Therefore, John is a mammal." 
B)  "Some animals are mammals. John is a mammal. Therefore, John is an animal." 
C)  "No animals are plants. John is a mammal. Therefore, John is not a plant." 
D)  "No animals are plants. John is an animal. Therefore, John is not a plant." 
A)  "Some animals are mammals. John is an animal. Therefore, John is a mammal." 
B)  "Some animals are mammals. John is a mammal. Therefore, John is an animal." 
C)  "No animals are plants. John is a mammal. Therefore, John is not a plant." 
D)  "No animals are plants. John is an animal. Therefore, John is not a plant."

Question 11

The premise "All dog go to heaven" is a particular proposition.

Accepted Answer

A) True 
 B)False

Question 12

A conditional claim cannot be the conclusion of a valid argument.

Accepted Answer

A) True 
 B)False

Question 13

Which of the following is a valid deductive form of argument?

Accepted Answer

A) modus tollens 
B) affirming the consequent 
C) ad hominem 
D) These are all deductively valid forms of argument. 
A) modus tollens 
B) affirming the consequent 
C) ad hominem 
D) These are all deductively valid forms of argument.

Question 14

Arguments by elimination are a type of disjunctive syllogism.

Accepted Answer

A) True 
 B)False

Question 15

The following argument is valid: "Some dogs are robust.John is robust.Therefore,John is a dog."

Accepted Answer

A) True 
 B)False

Question 16

Which is true of the following argument: "All dogs are rabid.Some rabid things are mammals.Therefore,some dogs are mammals."

Accepted Answer

A)  The argument is sound. 
B)  The argument is valid. 
C)  The argument is both unsound and invalid. 
D)  None of these answers is correct. 
A)  The argument is sound. 
B)  The argument is valid. 
C)  The argument is both unsound and invalid. 
D)  None of these answers is correct.

Question 17

Who is Bo Dietl?

Accepted Answer

A)  a highly decorated police officer known for his investigative expertise. 
B)  the discoverer of an important form of deductive reasoning known as "Dietl's Method". 
C)  a mathematician who discovered the type of deductive argument known as an argument based on mathematics. 
D)  None of these answers is correct. 
A)  a highly decorated police officer known for his investigative expertise. 
B)  the discoverer of an important form of deductive reasoning known as "Dietl's Method". 
C)  a mathematician who discovered the type of deductive argument known as an argument based on mathematics. 
D)  None of these answers is correct.

Question 18

A valid deductive argument always has a true conclusion.

Accepted Answer

A) True 
 B)False

Question 19

Which of the following best describes a hypothetical syllogism?

Accepted Answer

A) a hypothesis that is confirmed by observation 
B) a deductive argument with two premises,at least one of which is a hypothetical claim 
C) a generalization about a scientific hypothesis 
D) a deductive argument with a conclusion that is a hypothetical claim 
A) a hypothesis that is confirmed by observation 
B) a deductive argument with two premises,at least one of which is a hypothetical claim 
C) a generalization about a scientific hypothesis 
D) a deductive argument with a conclusion that is a hypothetical claim

Question 20

Which of the following is a sound argument?

Accepted Answer

A)  "If the moon is made of cheese, then Barack Obama is the president of Mexico. The moon is made of cheese. Therefore, Barack Obama is the president of Mexico." 
B)  "Either Turkey is a country or New York is a country. New York is not a country. So Turkey must be a country." 
C)  "I have seen millions of black crows. Therefore, all crows must be black". 
D)  "If the Earth is flat, then John Kerry is president of the United States. The Earth is not flat. Therefore, John Kerry is not president of the United States." 
A)  "If the moon is made of cheese, then Barack Obama is the president of Mexico. The moon is made of cheese. Therefore, Barack Obama is the president of Mexico." 
B)  "Either Turkey is a country or New York is a country. New York is not a country. So Turkey must be a country." 
C)  "I have seen millions of black crows. Therefore, all crows must be black". 
D)  "If the Earth is flat, then John Kerry is president of the United States. The Earth is not flat. Therefore, John Kerry is not president of the United States."

"All dogs are diseased.John is a dog.Therefore,John went to the vet." Which of the following is true of the preceding argument?

Which of the following is an example of a categorical syllogism?

If a valid deductive argument has a true conclusion,then it must have all true premises.

Which of the following is the primary concern of logic?

All deductive arguments have fewer than four premises.

The following argument is valid: "If the moon is made of cheese,then we can eat the moon.We cannot eat the moon.Therefore,the moon is not made of cheese."

Syllogisms are deductive arguments with two premises and a conclusion.

Valid deductive arguments guarantee the truth of their conclusions.

If an argument contains a premise that is just a definition,then the argument is invalid.

Which of the following is a valid categorical syllogism?

The premise "All dog go to heaven" is a particular proposition.

A conditional claim cannot be the conclusion of a valid argument.

Which of the following is a valid deductive form of argument?

Arguments by elimination are a type of disjunctive syllogism.

The following argument is valid: "Some dogs are robust.John is robust.Therefore,John is a dog."

Which is true of the following argument: "All dogs are rabid.Some rabid things are mammals.Therefore,some dogs are mammals."

Who is Bo Dietl?

A valid deductive argument always has a true conclusion.

Which of the following best describes a hypothetical syllogism?

Which of the following is a sound argument?

Critical Thinking: Why Its Important?

Reason and Emotion

Language and Communication

Knowledge, Evidence, and Errors in Thinking

Informal Fallacies

Recognizing, Analyzing, and Constructing Arguments

Inductive Arguments

Ethics and Moral Decision Making

Marketing and Advertising

Mass Media

Science

Law and Politics

Filters

Exam 8: Deductive Arguments

"All dogs are diseased.John is a dog.Therefore,John went to the vet." Which of the following is true of the preceding argument?

Which of the following is an example of a categorical syllogism?

If a valid deductive argument has a true conclusion,then it must have all true premises.

Which of the following is the primary concern of logic?

All deductive arguments have fewer than four premises.

The following argument is valid: "If the moon is made of cheese,then we can eat the moon.We cannot eat the moon.Therefore,the moon is not made of cheese."

Syllogisms are deductive arguments with two premises and a conclusion.

Valid deductive arguments guarantee the truth of their conclusions.

If an argument contains a premise that is just a definition,then the argument is invalid.

Which of the following is a valid categorical syllogism?

The premise "All dog go to heaven" is a particular proposition.

A conditional claim cannot be the conclusion of a valid argument.

Which of the following is a valid deductive form of argument?

Arguments by elimination are a type of disjunctive syllogism.

The following argument is valid: "Some dogs are robust.John is robust.Therefore,John is a dog."

Which is true of the following argument: "All dogs are rabid.Some rabid things are mammals.Therefore,some dogs are mammals."

Who is Bo Dietl?

A valid deductive argument always has a true conclusion.

Which of the following best describes a hypothetical syllogism?

Which of the following is a sound argument?

Critical Thinking: Why Its Important?

Reason and Emotion

Language and Communication

Knowledge, Evidence, and Errors in Thinking

Informal Fallacies

Recognizing, Analyzing, and Constructing Arguments

Inductive Arguments

Ethics and Moral Decision Making

Marketing and Advertising

Mass Media

Science

Law and Politics

Filters