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Regular expression a/b denotes which of the following set?

{a}

{

{a,b}

{ab}

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Which of the following problems occur?

i) Does a given program ever produce an output?
ii) If L is a CFL, then is L



            
                                                            
                            
                            A
                            
                                i, ii, iii, iv                            
                        
                                            
                            
                            B
                            
                                i, ii                            
                        
                                            
                            
                            C
                            
                                ii, iii, iv                            
                        
                                            
                            
                            D
                            
                                iii, iv                            
                        
                                                

            
                Correct Answer: D
                i) Is a variation of Turing Machine Halting problem and it is undecidable.



        
            
            
                            
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                MCQ            
            
        

        
            
                2.
                For any DFA state {qi,qj
            

            
                                                            
                            
                            A
                            
                                True                            
                        
                                            
                            
                            B
                            
                                False                            
                        
                                            
                            
                            C
                            
                                n>   
 Explanation : It the standard procedure to convert NFA to DFA.                            
                        
                                            
                            
                            D
                            
                                div class="v-slide-group__next v-slide-group__next--disabled">
 Explanation : It the standard procedure to convert NFA to DFA.                            
                        
                                                

            
                Correct Answer: A
                It the standard procedure to convert NFA to DFA.



        
            
            
                            
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                3.
                What is the relation between NFA-accepted languages and DFA accepted languages?
            

            
                                                            
                            
                            A
                            
                                >                            
                        
                                            
                            
                            B
                            
                                <                            
                        
                                            
                            
                            C
                            
                                <                            
                        
                                            
                            
                            D
                            
                                <=                            
                        
                                                

            
                Correct Answer: C
                The no of languages accepted by NFA and DFA is equal.
            
        

        
            
            
                            
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                4.
                Is empty string a valid input in Ndfa.
            

            
                                                            
                            
                            A
                            
                                True                            
                        
                                            
                            
                            B
                            
                                True                            
                        
                                            
                            
                            C
                            
                                >   
 Explanation : Empty strings can be inputted n a NDFA.                            
                        
                                            
                            
                            D
                            
                                iv class="v-slide-group__next v-slide-group__next--disabled">
 Explanation : Empty strings can be inputted n a NDFA.                            
                        
                                                

            
                Correct Answer: A
                Empty strings can be inputted n a NDFA.



        
            
            
                            
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                5.
                What is the complement of the language accepted by the NFA shown below? Assume ? = {a} and ? is the empty string.

            

            
                                                            
                            
                            A
                            
                                ?                            
                        
                                            
                            
                            B
                            
                                ?                            
                        
                                            
                            
                            C
                            
                                a                            
                        
                                            
                            
                            D
                            
                                {a, ?}                            
                        
                                                

            
                Correct Answer: B
                The given alphabet ? contains only one symbol {a} and the given NFA accepts all strings with any number of occurrences of 
            
        

        
            
            
                            
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