UGC NET CS 2018 July - II Question 79

79. A knowledge base contains just one sentence, ∃x AsHighAs (x, Everest). Consider the
following two sentences obtained after applying existential instantiation.
(a) AsHighAs (Everest, Everest)
(b) AsHighAs (Kilimanjaro, Everest)
Which of the following is correct with respect to the above sentences ?

(1) Both sentence (a) and sentence (b) are sound conclusions.
(2) Both sentence (a) and sentence (b) are unsound conclusions.
(3) Sentence (a) is sound but sentence (b) is unsound.
(4) Sentence (a) is unsound but sentence (b) is sound.

Answer: 4

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UGC NET CS 2018 July - II Question 78	UGC NET CS 2018 July - II Question 80