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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 9 of 15

Explore more Topics under Formal Languages and Automata Theory

Q81.
Which of the following is not a step in elimination of states procedure?

a.

Unifying all the final states into one using e-transitions

b.

Unify single transitions to multi transitions that contains union of input

c.

Remove states until there is only starting and accepting states

d.

Get the resulting regular expression by direct calculation

Discuss
Answer: (b).Unify single transitions to multi transitions that contains union of input
Q82.
Which of the following methods is suitable for conversion of DFA to RE?

a.

Brzozowski method

b.

Arden’s method

c.

Walter’s method

d.

All of the mentioned

Discuss
Answer: (a).Brzozowski method
Q83.
State true or false:
Statement: The state removal approach identifies patterns within the graph and removes state, building up regular expressions along each transition.

a.

true

b.

false

c.

may be

d.

none of the mentioned

Discuss
Answer: (a).true
Q84.
The behaviour of NFA can be simulated using DFA.

a.

always

b.

never

c.

sometimes

d.

none of the mentioned

Discuss
Answer: (a).always
Q85.
It is suitable to use ____________ method/methods to convert a DFA to regular expression.

a.

Transitive Closure properties

b.

Brzozowski method

c.

State elimination method

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q86.
State true or false:
Statement: For every removed state, there is a regular expression produced.

a.

true

b.

false

c.

may be

d.

can't say

Discuss
Answer: (a).true
Q87.
Is it possible to obtain more than one regular expression from a given DFA using the state elimination method?

a.

Yes

b.

No

c.

may be

d.

can't say

Discuss
Answer: (a).Yes
Q88.
A regular language over an alphabet a is one that can be obtained from

a.

union

b.

concatenation

c.

kleene

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q89.
Regular expression {0,1} is equivalent to

a.

0 U 1

b.

0 / 1

c.

0 + 1

d.

All of the mentioned

Discuss
Answer: (d).All of the mentioned
Q90.
Precedence of regular expression in decreasing order is

a.

* , . , +

b.

. , * , +

c.

. , + , *

d.

+ , a , *

Discuss
Answer: (a).* , . , +
Page 9 of 15

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