Q. The context free languages are closed under:

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Q. Given Grammar G1:
S->aSb

S->e

Grammar G2:

R->cRd

R->e

If L(G)=L(G1) U L(G2), the number of productions the new starting variable would have:

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Q. Context free languages are not closed under:

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Q. Which of the following is incorrect?
There exists algorithms to decide if:

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Q. If the start symbol is one of those symbols which produce no terminal through any sequence, the CFL is said to be

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Q. Using the pumping constant n, If there is a string in the language of length between _____ and ____ then the language is infite else not.

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Q. Which of the following is/are CFL not closed under?

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Q. If L1 and L2 are context free languages, L1-L2 are context free:

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Q. A___________ is context free grammar with atmost one non terminal in the right handside of the production.

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Q. There is a linear grammar that generates a context free grammar

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Q. The following format of grammatical notation is accepted by which of the following:
AB->CD

A->BC or

A->B or

A->a

where A, B, C, D are non terminal symbols and a is a terminal symbol.

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Q. Every Kuroda Normal form grammar generates ___________

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Q. Which of the following can generate Unrestricted grammars?

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Q. Given a grammar in GNF and a derivable string in the grammar with the length n, any ___________will halt at depth n.

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Q. Which of the following grammars is similar to Floyd Normal form?

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Q. Which among the following can parse a context free grammar?

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Q. The standard version of CYK algorithm operates only on context free grammars in the following form:

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Q. The __________ running time of CYK is O(n^3 .|G|)
where n is the length of the parse string and |G| is the size of the context free grammar G.

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Q. Which of the following is true for Valiants algorithm?

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Q. Which among the following is a correct option in format for representing symbol and expression in Backus normal form?

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