Q. Identify the language which is not context - free.

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Q. The context-free languages are closed for:

(i) Intersection                          (ii) Union
(iii) Complementation             (iv) Kleene Star

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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. In parallel algorithm design, the process of grouping tasks into larger tasks in order to improve performance:

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Q. Recursive Descent Parsers are a type of:

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Q. If language L={0,1}*, then the reversed language L^R =

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Q. Let r = a(a + b)*, s = aa*b and t = a*b be three regular expressions.
Consider the following:

(i) L(s) ⊆ L(r) and L(s) ⊆ L(t)
(ii) L(r) ⊆ L(s) and L(s) ⊆ L(t)

Choose the correct answer from given below:

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Q. Consider the language L given by

L = {2^(nk) ∣ k>0, and n is non-negative integer number}

The minimum number of states of finite automaton which accepts the language L is

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Q. The number of substrings that can be formed from string given by

a d e f b g h n m p

is

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Q. Consider the following two languages:

L1 = {x ∣ for some y with ∣y∣ = 2^∣x∣,xy ∈ L and L is regular language}
L2 = {x ∣ for some y such that ∣x∣ = ∣y∣, xy ∈ L and L is regular language}

Which one of the following is correct?

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Q. Consider the following languages:

L1 = {a^(n+m) b^n a^m ∣ n,m ≥ 0}
L2 = {a^(n+m) b^(n+m) a^(n+m) ∣ n,m ≥ 0}

Which of the following is correct?

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Q. Consider R to be any regular language and L1, L2 be any two context-free languages. Which of the following is correct?

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Q. Consider the following problems:

(i) Whether a finite state automaton halts on all inputs?
(ii) Whether a given context free language is regular?
(iii) Whether a Turing machine computes the product of two numbers?

Which one of the following is correct?

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Q. Which of the following problems is decidable for recursive languages (L)?

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Q. Consider the following grammar G:

S → A ∣ B
A → a ∣ c
B → b ∣ c
where {S, A, B} is the set of non-terminals, {a, b, c,} is the set of terminals.

Which of the following statement(s) is/are correct?
S1: LR(1) can parse all strings that are generated using grammar G.
S2: LL(1) can parse all strings that are generated using grammar G.

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Q. The grammar S → (S) ∣ SS ∣ ϵ is not suitable for predictive parsing because the grammar is

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Q. Two finite state machines are said to be equivalent if they:

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Q. A pushdown automata behaves like a Turing machine when the number of auxiliary memory is:

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Q. Pushdown automata can recognize language generated by ................

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