Paper 1 · Logical Reasoning
UGC NET December 2022 (12.03.2023) Shift-II (Management)
Which of the following statements are so related that if one of them is true the other must be false and vice-versa?
- All human beings are mortal
- Some human beings are mortal
- Some human beings are not mortal
- No human beings are mortal
A1 & 3 only ✓ Correct
B2 & 3 only
C3 & 4 only
D1 & 4 only
Correct answer: (A) 1 & 3 only — The answer is 1 and 3.
Explanation
★The answer is 1 and 3.
★Statement 1 is a universal affirmative, an A type proposition.
★Statement 3 is a particular negative, an O type proposition.
★An A proposition and its O proposition are contradictories.
★If one is true the other must be false and vice-versa.
★So statements 1 and 3 are the contradictory pair.
★So the answer is 1 and 3.
Want more like this? Create a free account to practise a full test, track your progress, and get spaced-repetition review.
Shared by Mcqkart · via Mcqkart.in