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Welcome to the Regular Expressions MCQs Page

Dive deep into the fascinating world of Regular Expressions with our comprehensive set of Multiple-Choice Questions (MCQs). This page is dedicated to exploring the fundamental concepts and intricacies of Regular Expressions, a crucial aspect of Formal Languages and Automata Theory. In this section, you will encounter a diverse range of MCQs that cover various aspects of Regular Expressions, from the basic principles to advanced topics. Each question is thoughtfully crafted to challenge your knowledge and deepen your understanding of this critical subcategory within Formal Languages and Automata Theory.

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Check out the MCQs below to embark on an enriching journey through Regular Expressions. Test your knowledge, expand your horizons, and solidify your grasp on this vital area of Formal Languages and Automata Theory.

Note: Each MCQ comes with multiple answer choices. Select the most appropriate option and test your understanding of Regular Expressions. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

Regular Expressions MCQs | Page 4 of 15

Explore more Topics under Formal Languages and Automata Theory

Q31.
Which of the following is true ?

a.

(01)*0 = 0(10)*

b.

(0+1)*0(0+1)*1(0+1) = (0+1)*01(0+1)*

c.

(0+1)*01(0+1)*+1*0* = (0+1)*

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q32.
Let the class of language accepted by finite state machine be L1 and the class of languages represented by regular expressions be L2 then

a.

L1=L2

b.

L1 U L2 = .*

c.

L1=L2

d.

None of the above

Discuss
Answer: (c).L1=L2
Q33.
Which of the following is not a regular expression?

a.

[(a+b)*-(aa+bb)]*

b.

[(0+1)-(0b+a1)*(a+b)]*

c.

(01+11+10)*

d.

(1+2+0)*(1+2)*

Discuss
Answer: (b).[(0+1)-(0b+a1)*(a+b)]*
Q34.
Regular expression are

a.

Type 0 language

b.

Type 1 language

c.

Type 2 language

d.

Type 3 language

Discuss
Answer: (a).Type 0 language
Q35.
Regular expressions are closed under

a.

Union

b.

Intersection

c.

Kleene star

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q36.
Regular expression (x/y)(x/y) denotes the set

a.

{xy,xy}

b.

{xx,xy,yx,yy}

c.

{x,y}

d.

{x,y,xy}

Discuss
Answer: (b).{xx,xy,yx,yy}
Q37.
Which of the following is same as the given DFA?

a.

(0+1)*001(0+1)*

b.

1*001(0+1)*

c.

(01)*(0+0+1)(01)*

d.

None of the mentioned

Discuss
Answer: (a).(0+1)*001(0+1)*
Q38.
Which of the given regular expressions correspond to the automata shown?

a.

(110+1)*0

b.

(11+110)*1

c.

(110+11)*0

d.

(1+110)*1

Discuss
Answer: (c).(110+11)*0
Q39.
Can the given state diagram be reduced?

a.

Yes

b.

No

c.

May be

d.

Can't say

Discuss
Answer: (a).Yes
Q40.
L is a regular Language if and only If the set of __________ classes of L is finite.

a.

Equivalence

b.

Reflexive

c.

Myhill

d.

Nerode

Discuss
Answer: (a).Equivalence
Page 4 of 15

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