Paper 1 · Logical Reasoning
UGC NET December 2023 (19.12.2023) Shift-II
If the statement 'All trucks are polluting vehicles' is given as false, then which of the following statements can be immediately inferred to be true?
ASome trucks are polluting vehicles
BSome trucks are not polluting vehicles ✓ Correct
CNo trucks are polluting vehicles
DNo polluting vehicles are trucks
Correct answer: (B) Some trucks are not polluting vehicles — From the false universal, the answer is that some trucks are not polluting vehicles.
Explanation
★From the false universal, the answer is that some trucks are not polluting vehicles.
★All trucks are polluting vehicles is a type A universal affirmative.
★If a type A statement is false, its contradictory type O must be true.
★The type O statement is some trucks are not polluting vehicles.
★Contradictories always have opposite truth values.
★The other options do not follow necessarily from A being false.
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