Regular expressions are

Related MCQs

• Let P be a regular language and Q be context-free language such that Q ∈ P. (For example, let P be the language represented by the regular expression p*q* and Q be {pnqn n∈ N}). Then which of the following is ALWAYS regular?
• Let the class of language accepted by finite state machine be L1 and the class of languages represented by regular expressions be L2 then
• Let S and T be language over ={a,b} represented by the regular expressions (a+b*)* and (a+b)*, respectively. Which of the following is true?
• A language is represented by a regular expression (a)*(a + ba). Which of the following strings does not belong to the regular set represented by the above expression?
• Which of the following are decidable? 1) Whether the intersection of two regular language is infinite. 2) Whether a given context free language is regular. 3) Whether two push down automata accept the same language. 4) Whether a given grammar is context free.
• Languages are proved to be regular or non regular using pumping lemma.
• If G is a simple connected 3-regular planar graph where every region is bounded by exactly 3 edges, then the edges of G is
• If G is a simple connected 3-regular planar graph where every region is bounded by exactly 3 edges, then the edges of G is
• P, Q, R are three languages. If P & R are regular and if PQ=R, then
• Which of the following is true with respect to Kleene’s theorem? 1 A regular language is accepted by a finite automaton. 2 Every language is accepted by a finite automaton or a turingmachine.