Paper 1 · Logical Reasoning
UGC NET June 2023 (21.06.2023) Shift-I
In a square of opposition, if the proposition No animals with horns are carnivores is false, which of the following codes is correct? A. Some animals with horns are carnivores is true. B. Some animals with horns are not carnivores is true. C. All animals with horns are carnivores is false. D. All animals with horns are carnivores is undetermined.
- Some animals with horns are carnivores is true
- Some animals with horns are not carnivores is true
- All animals with horns are carnivores is false
- All animals with horns are carnivores is undetermined
A1 & 4 only ✓ Correct
B1 & 3 only
C2 & 3 only
D2 & 4 only
Correct answer: (A) 1 & 4 only — The correct codes are that the particular affirmative is true and the universal affirmative is undetermined, so the answer is 1 and 4.
Explanation
★The correct codes are that the particular affirmative is true and the universal affirmative is undetermined, so the answer is 1 and 4.
★The given E proposition, no animals with horns are carnivores, is false.
★Its contradictory is the I proposition, some animals with horns are carnivores.
★Since the E proposition is false, its contradictory I proposition is true, matching item 1.
★The truth of the E proposition does not fix the truth of the A proposition.
★So all animals with horns are carnivores remains undetermined, matching item 4.
★So the correct codes are items 1 and 4.
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