Paper 1 · Logical Reasoning
UGC NET December 2022 (22.02.2023) Shift-I
Which of the following statements are contradictory to each other? A. All objects are perishable. B. Some objects are not perishable. C. Some objects are perishable. D. No objects are perishable.
- All objects are perishable
- Some objects are not perishable
- Some objects are perishable
- No objects are perishable
A1 & 4 only
B2 & 4 only
C3 & 4 only ✓ Correct
D1 & 3 only
Correct answer: (C) 3 & 4 only — The contradictory pair is C and D, so the answer is 3 and 4.
Explanation
★The contradictory pair is C and D, so the answer is 3 and 4.
★Contradictory statements cannot both be true and cannot both be false.
★Statement C is the particular affirmative, some objects are perishable.
★Statement D is the universal negative, no objects are perishable.
★The particular affirmative and the universal negative are exact contradictories.
★So if one is true the other must be false, and vice versa.
★So the contradictory pair is items 3 and 4.
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