Question 1

The immediate inference in which subject and predicate are interchanged is known as:
A)conversion
B)obversion
C)contraposition
D)none of these

Accepted Answer

Conversion is the immediate inference process where the subject and predicate of a statement are interchanged, keeping the truth of the statement intact.

Question 2

The immediate inference in which the quality of a proposition is changed without change in the meaning is known as:
A)conversion
B)obversion
C)contraposition
D)none of these

Accepted Answer

Obversion is the logical operation that involves changing the quality of a proposition (from affirmative to negative, or vice versa) without altering its meaning.

Question 3

Two propositions having the same subject and predicate, differ in quality only, the opposed propositions are called:
A)contraries
B)sub-contraries
C)sub-alterns
D)contradictories

Accepted Answer

Contraries are propositions that have the same subject and predicate but differ in quality (one is affirmative and the other is negative).

Question 4

Two propositions having the same subject and predicate, differ in quantity only, the opposed propositions are called :
A)contraries
B)sub-contraries
C)sub-alterns
D)contradictories

Accepted Answer

The answer of Two propositions having the same subject and...

Question 5

Immediate inference in which from a given proposition another proposition having the contradictory of the given predicate as it's subject is inferred is called:
A)conversion
B)obversion
C)contraposition
D)none of these

Accepted Answer

Contraposition is a type of immediate inference in which the subject and predicate of a proposition are exchanged, and the quality of the proposition is changed from affirmative to negative or vice versa.

Question 6

The partial contrapositive of 'All dealers are producers':
A)no non-producers are dealers
B)no non-producers are non-dealers
C)all dealers are non-producers
D)all non-dealers are producers

Accepted Answer

The partial contrapositive of the statement "All dealers are producers" involves negating both the subject and the predicate but only reversing the roles of the original statement's predicate. Thus, "No non-producers are dealers" correctly reflects the partial contrapositive, as it negates both terms (dealers become non-dealers, producers become non-producers) without reversing their roles.

Question 7

The full contrapositive of 'All dealers are producers':
A)no non-producers are dealers
B)no non-producers are non-dealers
C)all dealers are non-producers
D)all non-dealers are producers

Accepted Answer

The answer of The full contrapositive of 'All dealers are...

Question 8

The partial contrapositive of 'No dealers are producers':
A)some non-producers are dealers
B)some non-producers are non- dealers
C)all dealers are non-producers
D)all non-dealers are producers

Accepted Answer

The partial contrapositive of 'No dealers are producers' is 'some non-producers are dealers'.

Question 9

The partial contrapositive of 'Some dealers are not producers':
A)some non-producers are dealers
B)some non-producers are non- dealers
C)all dealers are non-producers
D)all non-dealers are producers

Accepted Answer

The partial contrapositive of "Some dealers are not producers" involves flipping and negating the terms, leading to "Some non-producers are dealers."

Question 10

The full contrapositive of 'Some dealers are not producers':
A)some non-producers are dealers
B)some non-producers are not non- dealers
C)all dealers are non-producers
D)all non-dealers are producers

Accepted Answer

The answer of The full contrapositive of 'Some dealers are...

Question 11

Name the fallacy: Ram is my friend Mohan is Ram's friend Therefore, Mohan is my friend
A)fallacy of four terms
B)ambiguous major
C)ambiguous minor
D)ambiguous middle

Accepted Answer

The middle term, "Ram," is used in two different senses. In the first premise, it refers to Ram as my friend. In the second premise, it refers to Ram as Mohan's friend. This equivocation leads to the invalid conclusion that Mohan is my friend.

Question 12

Name the fallacy: No courageous creature flies The eagle is a courageous creature Therefore, the eagle does not fly
A)fallacy of four terms
B)ambiguous major
C)ambiguous minor
D)ambiguous middle

Accepted Answer

The answer of Name the fallacy: No courageous creature flies...

Question 13

Name the fallacy: No man is made of paper All pages are men Therefore,No pages are made of paper
A)fallacy of four terms
B)ambiguous major
C)ambiguous minor
D)ambiguous middle

Accepted Answer

The answer of Name the fallacy: No man is made...

Question 14

Name the fallacy: All men are mortal All dogs are mortal Therefore, All men are dogs
A)undistribute middle
B)ambiguous major
C)ambiguous minor
D)ambiguous middle

Accepted Answer

The fallacy is "undistributed middle" because the middle term "mortal" is not distributed properly between the two premises, leading to a faulty conclusion that does not logically follow.

Question 15

Name the fallacy: Some intelligent persons are wise No wise persons are king Therefore, Some kings are not intelligent
A)undistributed middle
B)illicit major
C)illicit minor
D)ambiguous middle

Accepted Answer

The answer of Name the fallacy: Some intelligent persons are...

Question 16

Identify the fallacy: All men are mortal All men are intelligent Therefore, All intelligent persons are mortal
A)undistributed middle
B)illicit major
C)illicit minor
D)ambiguous middle

Accepted Answer

The answer of Identify the fallacy: All men are mortal...

Question 17

No Indians are ungrateful All Indians are religious Therefore ,No religious person is ungrateful
A)undistributed middle
B)illicit major
C)illicit minor
D)ambiguous middle

Accepted Answer

The answer of No Indians are ungrateful All Indians are...

Question 18

Identify the fallacy: All girls are shy This boy is shy Therefore , This boy is girl
A)undistributed middle
B)illicit major
C)illicit minor
D)ambiguous middle

Accepted Answer

The fallacy is "undistributed middle" because the middle term "shy" is not distributed in either the major or minor premise, leading to a faulty conclusion that does not logically follow from the premises.

Question 19

Identify the fallacy: Al college teachers are graduates He is not a college teacher Therefore , He is not a graduate
A)undistributed middle
B)illicit major
C)illicit minor
D)ambiguous middle

Accepted Answer

The fallacy is "illicit major" because the major term (graduate) is not distributed in the major premise but is distributed in the conclusion, leading to an invalid inference.

Question 20

Identify the fallacy: All cows are quadrupeds No dogs are cows Therefore , No dogs are quadrupeds
A)undistributed middle
B)illicit major
C)illicit minor
D)ambiguous middle

Accepted Answer

The answer of Identify the fallacy: All cows are quadrupeds...

Quiz 5: Logical Reasoning Fallacies

The immediate inference in which subject and predicate are interchanged is known as:

The immediate inference in which the quality of a proposition is changed without change in the meaning is known as:

Two propositions having the same subject and predicate, differ in quality only, the opposed propositions are called:

Two propositions having the same subject and predicate, differ in quantity only, the opposed propositions are called :

Immediate inference in which from a given proposition another proposition having the contradictory of the given predicate as it's subject is inferred is called:

The partial contrapositive of 'All dealers are producers':

The full contrapositive of 'All dealers are producers':

The partial contrapositive of 'No dealers are producers':

The partial contrapositive of 'Some dealers are not producers':

The full contrapositive of 'Some dealers are not producers':

Name the fallacy: Ram is my friend Mohan is Ram's friend Therefore, Mohan is my friend

Name the fallacy: No courageous creature flies The eagle is a courageous creature Therefore, the eagle does not fly

Name the fallacy: No man is made of paper All pages are men Therefore,No pages are made of paper

Name the fallacy: All men are mortal All dogs are mortal Therefore, All men are dogs

Name the fallacy: Some intelligent persons are wise No wise persons are king Therefore, Some kings are not intelligent

Identify the fallacy: All men are mortal All men are intelligent Therefore, All intelligent persons are mortal

No Indians are ungrateful All Indians are religious Therefore ,No religious person is ungrateful

Identify the fallacy: All girls are shy This boy is shy Therefore , This boy is girl

Identify the fallacy: Al college teachers are graduates He is not a college teacher Therefore , He is not a graduate

Identify the fallacy: All cows are quadrupeds No dogs are cows Therefore , No dogs are quadrupeds