## Square-of-opposition

 Question 1
If the proposition “All men are not mortal” is true then which of the following inferences is correct ? Choose from the code given below :
1. “All men are mortal” is true.
2. “Some men are mortal” is false.
3. “No men are mortal” is doubtful.
4. “All men are mortal” is false.
 A 1, 2 and 3 B 2, 3 and 4 C 1, 3 and 4 D 1 and 3
Logical-Reasoning       Square-of-opposition       2012 June UGC NET Paper 1
Question 1 Explanation: Question 2
If the statement ‘some men are honest’ is false, which among the following
statements will be true. Choose the correct code given below:
(i) All men are honest
(ii) No men are honest
(iii) Some men are not honest.
(iv) All men are dishonest.
 A (i), (ii) and (iii) B (ii), (iii) and (iv) C (i), (iii) and (iv) D (ii), (i) and (iv)
Logical-Reasoning       Square-of-opposition       2013 June UGC NET Paper 1
 Question 3
By which of the following proposition, the proposition “wise men are hardly afraid of death” is contradicted?
 A Some wise men are afraid of death. B All wise men are afraid of death. C No wise men is afraid of death. D Some wise men are not afraid of death.
Logical-Reasoning       Square-of-opposition       2014 December UGC NET Paper 1
Question 3 Explanation:
Option ‘B’ is suitable contradicted to given proposition.
 Question 4
If two propositions having the same subject and predicate terms are such that one is the denial of the other, the relationship between them is called
 A Contradictory B Contrary C Sub-contrary D Sub-alteration
Logical-Reasoning       Square-of-opposition       2013 December UGC NET Paper 1
 Question 5
If two propositions cannot both be false but may both be true, what is the relation between the two propositions ?
 A Contrary B Sub-contrary C Sub-alternation D Contradictory
Logical-Reasoning       Square-of-opposition       2013 September UGC NET Paper 1
Question 5 Explanation:
Subcontrary:- Two prepositions can be true, but cannot be false.
 Question 6
What is equivalent of the statement ‘All atheists are pessimists’ ?
 A All non-pessimists are nonatheists. B All non-atheists are nonpessimists. C All pessimists are atheists. D None of the above.
Logical-Reasoning       Square-of-opposition       2013 September UGC NET Paper 1
Question 6 Explanation: Question 7
If two propositions having the same subject and predicate terms can both be true but cannot both be false, the relation between those two propositions is called
 A contradictory B contrary C subcontrary D subaltern
Logical-Reasoning       Square-of-opposition       2014 June UGC NET Paper 1
Question 7 Explanation:
Subcontrary:- Denoting the preposition can be true but cannot be false.
There are 7 questions to complete.

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