Q. The parse tree below represents a rightmost derivation according to the grammar S → AB, A → aS|a, B → bA. Which of the following are right-sentential forms corresponding to this derivation?

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Q. The grammar G: S → SS | a | b is ambiguous. Check all and only the strings that have exactly two leftmost derivations in G.

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Q. For the following grammar, Identify all the unit pairs.

S → A | B | 2 A → C0 | D B → C1 | E C → D | E | 3 D → E0 | S E → D1 | S

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Q. Which of the following is not regular?

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Q. If L1 and L2 are regular languages is/are also regular language(s).

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Q. If P & R are regular languages and also given that if PQ=R, then

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Q. Which of the following conversion is not possible (algorithmically)?

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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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