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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