GATE CSE 2016 Set 1 | Push Down Automata and Context Free Language Question 20 | Theory of Computation

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GATE CSE 2016 Set 1

MCQ (Single Correct Answer)

-0.3

Which of the following languages is generated by the given grammar? $$$S \to aS|bS|\varepsilon $$$

$$\left\{ {{a^n}{b^m}|n,m \ge 0} \right\}$$

$$\left\{ {w \in \left\{ {a,b} \right\}{}^ * |w} \right.$$ has equal number of $$a’s$$ and $$\left. {b's} \right\}$$

$$\left\{ {{a^n}|n \ge 0} \right\} \cup \left\{ {{b^n}|n \ge 0} \right\} \cup \left\{ {{a^n}{b^n}|n \ge 0} \right\}$$

$${\left\{ {a,b} \right\}^ * }$$

GATE CSE 2011

MCQ (Single Correct Answer)

-0.3

The lexical analysis for a modern computer language such as java needs the power of which one of the following machine model in a necessary and sufficient sense?

Finite state automata

Deterministic pushdown automata

Non -deterministic pushdown automata

Turing machine

GATE CSE 2009

MCQ (Single Correct Answer)

-0.3

Which one of the following is FALSE?

There is a unique minimal $$DFA$$ for every regular language

Every $$NFA$$ can be converted to an equivalent $$PDA$$

Complement of every context free language is recursive

Every non deterministic $$PDA$$ can be converted to an equivalent deterministic $$PDA$$

GATE CSE 2009

MCQ (Single Correct Answer)

-0.3

$$S \to aSa\,\left| {\,bSb\,\left| {\,a\,\left| {\,b} \right.} \right.} \right.$$
The language generated by the above grammar over the alphabet $$\left\{ {a,\,b} \right\}$$ is the set of

All palindromes

All odd length palindromes

Strings that begin and with same symbol

All even length palindromes

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