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.

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 6 of 15

Explore more Topics under Formal Languages and Automata Theory

01

Basics of Automata Theory

02

Finite Automata

03

DFA Minimization

04

Context Free Grammars

05

Regular Languages

06

Push Down Automata

07

Context Free Languages

08

Introduction to Turing Machines

09

Undecidability and Intractable Problems

Q51.

P, O, R be regular expression over ∑, P is not ε, then
R=Q + RP has a unique solution:

Q*P

QP*

Q*P*

(P*O*) *

Discuss

Answer: (b).QP*

Q52.

Arden’s theorem is true for:

More than one initial states

Null transitions

Non-null transitions

None of the mentioned

Discuss

Answer: (c).Non-null transitions

Q53.

The difference between number of states with regular expression (a + b) and (a + b) * is:

Discuss

Answer: (a).1

Q54.

In order to represent a regular expression, the first step to create the transition diagram is:

Create the NFA using Null moves

Null moves are not acceptable, thus should not be used

Predict the number of states to be used in order to construct the Regular expression

None of the mentioned

Discuss

Answer: (a).Create the NFA using Null moves

Q55.

(0+ε) (1+ε) represents

{0, 1, 01, ε}

{0, 1, ε}

{0, 1, 01 ,11, 00, 10, ε}

{0, 1}

Discuss

Answer: (a).{0, 1, 01, ε}

Q56.

The minimum number of states required to automate the following Regular Expression:
(1) *(01+10) (1) *

Discuss

Answer: (a).4

Q57.

Regular Expression denote precisely the ________ of Regular Language.

Class

Power Set

Super Set

None of the mentioned

Discuss

Answer: (a).Class

Q58.

Which of the following is correct?
Statement 1: ε represents a single string in the set.

Statement 2: Ф represents the language that consist of no string.

Statement 1 and 2 both are correct

Statement 1 is false but 2 is correct

Statement 1 and 2 both are false

There is no difference between both the statements, ε and Ф are different notation for same reason

Discuss

Answer: (a).Statement 1 and 2 both are correct

Q59.

The appropriate precedence order of operations over a Regular Language is

Kleene, Union, Concatenate

Kleene, Star, Union

Kleene, Dot, Union

Star, Union, Dot

Discuss

Answer: (c).Kleene, Dot, Union

Q60.

Regular Expression R and the language it describes can be represented as:

R, R(L)

L(R), R(L)

R, L(R)

All of the mentioned

Discuss

Answer: (c).R, L(R)

Page 6 of 15

Welcome to the Regular Expressions MCQs Page

Regular Expressions MCQs | Page 6 of 15

Explore more Topics under Formal Languages and Automata Theory

Basics of Automata Theory

Finite Automata

DFA Minimization

Context Free Grammars

Regular Languages

Push Down Automata

Context Free Languages

Introduction to Turing Machines

Undecidability and Intractable Problems

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