Q. Recursively enumerable languages are not closed under:

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Q. Grammar that produce more than one Parse tree for same sentence is:

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Q. Automaton accepting the regular expression of any number of a ‘ s is:

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Q. Grammars that can be translated to DFAs:

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Q. The language accepted by a Push down Automata:

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Q. Given the following statements:

(i) Recursive enumerable sets are closed under complementation.
(ii) Recursive sets are closed under complements.

Which is/are the correct statements?

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Q. Assume statements S1 and S2 defined as:

S1: L2-L1 is recursive enumerable where L1 and L2 are recursive and recursive enumerable respectively. S2: The set of all Turing machines is countable.

Which of the following is true?

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Q. A context free language is called ambiguous if

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Q. Which of the following statement is false?

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Q. The context free grammar S → A111|S1, A → A0 | 00 is equivalent to

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Q. The context free grammar S → SS | 0S1 | 1S0 | ɛ generates

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Q. Which of the following statement is false?

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Q. Push down automata accepts which language

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Q. A regular Grammar is a

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Q. A CFG is closed under

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Q. Which of these does not belong to CFG ?

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Q. A language is regular if and only if

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Q. Regular grammar is

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Q. Give a production grammar that specified language L = {a^i b^2i >= 1}

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Q. The production Grammar {S->aSbb, S->abb} is

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