Categorical Syllogism Exercises
Note: Answers will be provided upon request.
Practice Test I
From the list of possible conclusions provided, pick the one the makes the syllogism
valid. Write only the letter on the space provided before each number.
_____ 1. All public properties are for common use. Some roads are public properties.
a. Ergo, all roads are for common use.
b. Ergo, some roads are for common use.
c. Ergo, some roads are not for common use.
d. Ergo, no roads are for common use.
_____2. No plunderers are dignified persons. Some politicians are plunderers.
a. Ergo, some dignified persons are not politicians.
b. Ergo, some politicians are dignified persons.
c. Ergo, some politicians are not dignified persons.
d. Ergo, some dignified persons are politicians.
_____3. No bird is a fish. Some fish are sharks.
a. Ergo, some sharks are not birds
b. Ergo, some birds are not sharks.
c. Ergo, some sharks are birds.
d. Ergo, some birds are sharks.
_____4. All government officials are worthy of respect. However, some policemen are
government officials.
a. Ergo, some policemen are not worthy of respect.
b. Ergo, every policeman is worthy of respect.
c. Ergo, some policemen are worthy of respect.
d. Ergo, any policeman is not worthy of respect.
Note: Answers will be provided upon request.
Practice Test I
From the list of possible conclusions provided, pick the one the makes the syllogism
valid. Write only the letter on the space provided before each number.
_____ 1. All public properties are for common use. Some roads are public properties.
a. Ergo, all roads are for common use.
b. Ergo, some roads are for common use.
c. Ergo, some roads are not for common use.
d. Ergo, no roads are for common use.
_____2. No plunderers are dignified persons. Some politicians are plunderers.
a. Ergo, some dignified persons are not politicians.
b. Ergo, some politicians are dignified persons.
c. Ergo, some politicians are not dignified persons.
d. Ergo, some dignified persons are politicians.
_____3. No bird is a fish. Some fish are sharks.
a. Ergo, some sharks are not birds
b. Ergo, some birds are not sharks.
c. Ergo, some sharks are birds.
d. Ergo, some birds are sharks.
_____4. All government officials are worthy of respect. However, some policemen are
government officials.
a. Ergo, some policemen are not worthy of respect.
b. Ergo, every policeman is worthy of respect.
c. Ergo, some policemen are worthy of respect.
d. Ergo, any policeman is not worthy of respect.
