Theoretical Computer Science MCQ : Regular Language - Pumping lemma, Closure properties of regular Languages : Link3
Theoretical Computer Science MCQ & Answers
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Q.1. ===Consider the languages L1 = \phi and L2 = {a}. Which one of the following represents L1 L2* U L1*
A. {ε}
B. {ε, a}
C. 𝛟
D. a*
Q.2. Given the language L = {ab, aa, baa}, which of the following strings are in L*?
1) abaabaaabaa
2) aaaabaaaa
3) baaaaabaaaab
4) baaaaabaa
A. 1, 2 and 3
B. 2, 3 and 4
C. 1, 2 and 4 D. 1, 3 and 4
Q.3. The set of all string over {a, b} of even length is represented by the regular expression-----
A. (ab+aa+bb+ba)*
B. (a+b)*(a*+b)*
C. (a+b)* D. (ab+ba)*
Q.4. L={a^2n | n>=1} is represented by the regular expression--------
A. (aa)*
B. a*
C. aa*a
D. a*a*
Q.5. Which of the following operation can be applied on regular expressions?
A. Union
B. Concatenation
C. Closure
D. All of the above
Q.6. Regular expressions are used to represent which language?
A. Recursive language
B. Regular language
C. Context free language
D. All of the above.
Q.7. The set of all strings over ∑ = {0,1} in which all strings that beings and ends with 0 is--------
A. 0(0+1)0
B. 00
C. 00(0+1)0
D. 00(0+1)11
Q.8. The set of all strings over ∑ = {a,b} in which all strings that starts with and ends with same letter is--------
A.[a(a+b)*b + b(a+b)*a]
B. [a(a+b)*a + b(a+b)*b]
C. a(a+b)*a
D. b(a+b)*b
Q.9. Which of the following does the given Mealy machine represents?
A. 1’s Complement
B. 2’s Complement
C. 10’s Complement
D. 9’s Complement
Q.10. The number of elements present in the ε-closure(A) in the given diagram.
A. 1
B. 2
C. 3
D. 4
Q.11. Which of the following will not be accepted by the following DFA?
A. ababaabaa
B. abbbaa
C. abbbaabb D. abbaabbaa
Q.12. Which among the following is the missing transition in the given DFA?
L= {xϵ∑= {a, b} | x starts with a and ends with b}
A. δ (q0, a) =q0
B. δ (F, a) =D
C. δ (F, a) =q1
D. δ (q1, a) =D
Q.13. Reverse of a DFA can be formed by----
A. using PDA
B. making final state as non-final
C. making final as starting state and starting state as final state
D. None of the above.
Q.14. The language accepted by this DFA is---
A. b*ab*ab*ab*
B. (a+b)*
C. b*a(a+b)*
D. b*ab*ab*
Q.15. The minimum state automaton equivalent to the below FSA has the following number of states----
A. 1
B. 2
C. 3 D. 4