Monday, 1 April 2019

UGC NET Computer Science July 2018 - II Question 34

Question 34
34. Pushdown automata can recognize language generated by ______ .

Options:
  1. (1) Only context free grammar
  2. (2) Only regular grammar
  3. (3) Context free grammar or regular grammar
  4. (4) Only context sensitive grammar
Answer: (3) Context free grammar or regular grammar

Explanation Question 34
  • Turing Machine recognises ALL
  • Linear Bounded Automata recognises context sensitive grammar, Context free grammar, regular grammar
  • Push down automata recognises Context free grammar, regular grammar
  • Finite Automata recognises only regular grammar
So, Push down automata reconize regular as well as context free grammar.

So, Option (3) is correct answer.

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