University of Saskatchewan
PHIL 140.3 (T1T1)
Critical Thinking
IN-CLASS EXAM II
Instructor: B.G. Wiebe 
Location: 
Time: 
NAME:__________________________
Section One (1% each)
Identify the type of statement or the statement represented by the diagram.
 
1. 
a. Some B are not A 
b. All A are B 
c. Some A are B 
d. Some A are not B 
e. No B are A		 2. 
a. Some G are not H 
b. Some G are H 
c. No G are H 
d. All H are G 
e. All G are H
3. 
a. All S are P 
b. No S are P 
c. All P are S 
d. Some S are not P 
e. Some P are S		 4. 
a. Some M are not P 
b. Some P are not M 
c. No M are P 
d. All P are M 
e. All M are P 

5. A few planets can support life.
 
a. E b. A c. O d. I  e. None of the above.

6. At least two people are not in the class of people with bellybuttons.
 

a. Universal-affirmative b. Universal-negative c. Particular-negative
d. Particular-affirmative e. None of the above

7. Only the lonely know the way I feel tonight.
 
a. E b. A c. O d. I  e. None of the above.

8. John of the Beatles is dead.
 

a. Universal-affirmative b. Universal-negative c. Particular-negative
d. Particular-affirmative e. None of the above

9. A prisoner will be executed, unless the rebels resume fighting.
 

a. Conjunction b. Hypothetical c. Disjunction
d. Biconditional e. None of the above

10. Adam was born of woman, or he would have no bellybutton.
 

a. Conjunction b. Hypothetical c. Disjunction
d. Biconditional e. None of the above
Section Two (2% each)
11. In this statement: Crows are birds.
 
a. Only the predicate is distributed  b. Both are distributed c. Only the subject is distributed
d. Neither are distributed e. None of the above

12. In this statement: No evidence which could verify whether Adam had a bellybutton can be found.
 

a. Only the predicate is distributed  b. Both are distributed c. Neither are distributed
d. Only the subject is distributed e. None of the above

13. Correctly diagram this argument. All M are P. Some S are M. So some S are P.
 

a. b. c. d.
e. None of the above

14. This diagram shows which conclusion to be valid?


 
a. All P are S b. All S are P c. No S are P d. Some S are P e. Some S are not P

Suppose you know that this statement is False: All meat sold at Safeway is non-irradiated. What do you then know about the following?

15. Some meat sold at Safeway is non-irradiated.
a. True b. Indeterminate c. False d. All of the above e. None of the above

16. Some non-irradiated meat is meat sold at Safeway.
a. True b. Indeterminate c. False d. All of the above e. None of the above

17. No meat sold at Safeway is irradiated.
a. True b. Indeterminate c. False d. All of the above e. None of the above

Suppose that you know this statement is True: Some musicians are depressing. What do you then know about the following?

18. Every depressing person is a musician.
a. True b. Indeterminate c. False d. All of the above e. None of the above

19. No depressing person is a musician.
a. True b. Indeterminate c. False d. All of the above e. None of the above

20. Some musician is not non-depressing.
a. True b. Indeterminate c. False d. All of the above e. None of the above

Section Three (4% each)
In the following : Rule 1 refers to the rule that the middle term must be distributed at least once. 
Rule 2 refers to the rule that any term distributed in the conclusion must be distributed in its premise. 
Rule 3 refers to the rule that there must not be 2 negative premises. 
Rule 4 refers to the rule that there must be a negative premise for a negative conclusion and vice versa.

21. Any syllogism of the form IEO-3 is
a. Breaking Rule 1 b. Breaking Rule 2 c. Breaking Rule 3 d. Breaking Rule 4 e. Valid

22. None who leave Plato's cave can look at the sun. All who leave Plato's cave are good at predicting the movements of shadows. So some who can look at the sun are not good at predicting the movements of shadows. This argument has which form?
a. EAO-2 b. AEO-3 c. EAO-3 d. AEO-2 e. AEE-4

23. Test this argument using the diagram method: All prisoners have broken the law. None who have broken the law are trustworthy. So some prisoners are not trustworthy.

24. Suppose that it is false that some valid arguments are non-convincing. What do we then know about: "No convincing things are valid arguments"?
a. True b. Indeterminate c. False d. All of the above e. None of the above

25. Suppose that it is false that some Beatles fans are Stones fans. What do we then know about: "Some non-Stones-fans are Beatles fans"?
a. True b. Indeterminate c. False d. All of the above e. None of the above

26. Any syllogism in the form AOE-2 is
a. Breaking Rule 2 b. Breaking Rule 4 c. Breaking Rule 1 d. Breaking Rule 3 e. Valid

27. Any syllogism of the form AAO-1 is
a. Breaking Rule 4 & 2 b. Breaking Rule 3 & 4 c. Breaking Rule 3 d. Breaking Rule 1 & 2 e. Valid

28. I am happy only if grass is pink with purple polka dots. Since grass is not pink with purple polka dots, it follows that I'm not happy. This argument is
 

a. Invalid as it denies an antecedent b. Valid as it denies a consequent c. Valid as it affirms an antecedent
d. Invalid as it affirms a disjunct e. Valid as it affirms a consequent

29. Any syllogism of the form AOO-4 is diagrammed how?
 

a. b. c. d. e.

30. One's eyes are not both used to the bright light of day and used to the dim shadows of the cave. The prisoners' eyes in Plato's cave are not used to the bright light of day, so they are used to the dim shadows of the cave. This argument is
 

a. Invalid as it denies a disjunct b. Invalid as it denies an antecedent c. Valid as it denies a conjunct
d. Invalid as it denies a conjunct e. Valid as it affirms a disjunct
Section Four (5% each)
31. Which diagram represents this argument? Some students are protesters. Some protesters are not serious. Therefore some students are not serious.
 
a. b. c. d. e.

32. Which is the correct truth table for this argument? Water is a liquid and water is not a liquid. Thus God
exists. A: Water is liquid B: God exists
 

a. b. c. d.
A
B
~A
A & ~A
B
T
T
F
T
T
F
T
T
T
T
T
F
F
T
F
F
F
T
T
F
 
 
 
invalid
 
 
A
B
~A
A & ~A
B
T
T
F
F
T
F
T
T
F
T
F
F
T
F
F
T
F
F
F
F
 
 
 
invalid
 
 
A
B
~A
A & ~A
B
T
T
F
F
T
F
T
T
F
T
T
F
F
F
F
F
F
T
F
F
 
 
 
invalid
 
 
A
B
~A
A & ~A
B
T
T
F
F
T
F
T
T
F
T
T
F
F
F
F
F
F
T
F
F
 
 
 
valid
 
 
e. All of the above.

Consider this extended argument: Fish have gills. Since no mammals can breath under water, they cannot be fish.

33. The second step can be analyzed as a categorical syllogism with this assumed premise:

34. The first step can be analyzed as a categorical argument with this assumed premise: 35. The extended argument as a whole is 36. Which is the correct truth table for this argument?
a. 
M
N
O
M v N
N & O
(N & O) É M
~M
~O
~O & N
T
T
T
T
T
T
F
F
F
F
T
F
T
F
T
T
T
T
T
F
T
T
F
T
F
F
F
F
F
T
F
F
T
T
F
F
T
T
F
T
F
T
F
T
T
F
T
T
T
T
F
T
F
F
T
F
F
T
F
T
F
T
F
F
F
F
F
F
T
T
T
F
 
 
 
 
 
invalid
 
 
 
 		 c. 
M
N
O
M v N
N & O
(N & O) É M
~M
~O
~O & N
T
T
T
T
T
T
F
F
F
F
T
T
T
T
F
T
F
F
T
F
T
T
F
T
F
F
F
F
F
T
F
F
T
T
F
F
T
T
F
T
F
T
F
T
T
F
T
F
T
F
T
T
T
T
T
F
F
T
F
T
F
T
F
F
F
F
F
F
T
T
T
F
 
 
 
 
 
invalid
 
 
 
 
b. 
M
N
O
M v N
N & O
(N & O) É M
~M
~O
~O & N
T
T
T
T
T
T
F
F
F
F
T
T
F
T
F
T
F
F
T
F
T
F
F
T
F
F
F
F
F
T
F
F
T
T
F
F
T
T
F
T
F
T
F
T
T
F
T
F
F
F
T
T
T
T
T
F
F
F
F
T
F
T
F
F
F
F
F
F
T
T
T
F
 
 
 
 
 
valid
 
 
 
 		 d. 
M
N
O
M v N
N & O
(N & O) É M
~M
~O
~O & N
T
T
T
T
T
T
F
F
F
F
T
T
T
T
F
T
F
F
T
F
T
T
F
T
F
F
F
F
F
T
F
F
T
T
F
F
T
T
F
T
F
T
F
T
T
F
T
F
T
F
T
T
T
T
T
F
F
T
F
T
F
T
F
F
F
F
F
F
T
T
T
F
 
 
 
 
 
valid
 
 
 
 
e. 
M
N
O
M v N
N & O
(N & O) É M
~M
~O
~O & N
T
T
T
T
T
T
F
F
F
F
T
T
T
T
T
T
F
F
T
F
T
T
F
F
F
F
F
F
F
T
F
F
T
T
F
F
T
T
F
T
F
F
F
T
T
F
T
F
T
F
T
T
T
T
T
F
F
T
F
F
F
T
F
F
F
F
F
F
T
T
T
F
 
 
 
 
 
invalid
 
 
 
 
 The End

ANSWERS:

1. e 2. b 3. a 4. a  5. d 6. c 7. b 8. a 9. b 10. c
11. c 12. b 13. d 14. e 15. b 16. b 17. c  18. b 19. c 20. a
21. b 22. b 23. a 24. c 25. a 26. a 27. a 28. b 29. a 30. d
31. b  32. d 33. b  34. a 35. e 36. d