Best Perl Test - 80+ MCQs: Perl test: Evaluate Your Perl Programming Skills with Perl Questions and Answers

1. How do you open a file in Perl for both reading and writing?

file_open()

openRW()

open() with 'rw' mode

open() with '+<' mode

2. In Perl, how do you create a constant variable?

const()

define()

constant()

readonly()

3. Explain the concept of Perl's 'tie::IxHash' module.

To tie variables to an ordered hash.

To manage XML data structures.

To create custom indexes for arrays.

To handle autovivification in Perl.

4. Explain the purpose of the 'wantarray' function in Perl.

To determine the number of elements in an array.

To check if an array is empty.

To examine the context of a function call.

To validate the return type of a subroutine.

5. What is the purpose of the 'given-when' construct in Perl?

Defines a subroutine

Switch statement for easier flow control

Iterates over elements of an array

Creates a hash table

6. Explain the purpose of the 'mro' module in Perl.

To manipulate regular expressions.

To manage multiple inheritance in Perl.

To provide access to system memory.

To handle file input/output operations.

7. In Perl, how do you declare an array?

@myArray

#myArray

$myArray

&myArray

8. What is the purpose of the 'elsif' statement in Perl?

To execute code when a condition is true

To handle errors

To execute code when a condition is false

To add an additional condition

9. How do you access command-line arguments in Perl?

@ARGV

$ARGV

%ARGV

&ARGV

10. What is the 'do' block used for in Perl?

To define a loop.

To execute an external command.

To include and run an external file.

To create a subroutine.

11. What is the purpose of the 'else' statement in Perl?

To execute code when a condition is true

To handle errors

To execute code when a condition is false

To break out of a loop

12. Explain the role of the 'XSLoader' module in Perl.

To load external modules dynamically.

To handle XML parsing in Perl.

To extend Perl's syntax.

To optimize regular expressions.

13. What is a closure in Perl, and how is it useful?

A closure is a function with no arguments.

A closure is a function that can access variables from its lexical scope even after that scope has finished execution.

A closure is a built-in Perl module for handling files.

A closure is a way to declare a class in Perl.

14. Which module is used for handling JSON in Perl?

JSON::Encode

PerlJSON

JSON::Parser

JSON::XS

15. Which Perl function is used for reading input from the standard input?

input()

readline()

scanf()

gets()

16. Which operator is used for string concatenation in Perl?

17. Which operator is used for logical AND in Perl?

and

18. In Perl, how do you get the current process ID?

$PID

$PROCESS_ID

getpid()

current_pid()

19. Which function is used for pattern matching in Perl?

search()

match()

regex()

20. What is the purpose of the 'use strict;' pragma in Perl?

Enforces strict type-checking

Allows lax variable naming

Enhances code performance

Disables error reporting

21. What is the purpose of the 'my' keyword in Perl?

To declare a variable

To print output

To perform mathematical operations

To define a function

22. What is the 'namespace::autoclean' module used for in Perl?

To manage namespaces in Perl.

To clean up the namespace of a module.

To create automatic namespaces.

To handle XML namespace declarations.

23. Explain the purpose of the 'IPC::Run' module in Perl.

To handle inter-process communication.

To run scripts in parallel.

To manage file input/output operations.

To handle XML parsing in Perl.

24. Explain the use of the 'POE' module in Perl.

To manage plain old data structures.

To handle post office events.

To enable parallel programming.

To create custom operators.

25. What is the purpose of the 'strict' pragma in Perl?

To enable strict typing

To enforce variable declaration

To allow runtime errors

To disable warnings

26. What is the significance of the 'bignum' pragma in Perl?

To handle big integer calculations.

To define a big number data type.

To control the precision of floating-point operations.

To convert strings to big numbers.

27. What is the purpose of the 'map' function in Perl?

Applies a transformation to each element of a list

Creates a new array

Calculates the square root of each element

Sorts elements in ascending order

28. Explain the concept of tied variables in Perl and provide a use case.

Tied variables are variables bound to a specific file.

Tied variables are used for dynamic scoping.

Tied variables are a form of autovivification.

Tied variables are variables associated with a specific class, enabling custom behavior for variable access.

29. What is the significance of the 'Perl::Critic' module in Perl development?

To critique and evaluate Perl code for best practices.

To handle criticism in Perl scripts.

To optimize regular expressions.

To provide a code coverage analysis.

30. Explain the purpose of the 'tie' and 'tied' functions in Perl.

To bind a variable to an object and retrieve its methods

To concatenate two strings

To create a linked list

To declare a variable as tied

31. How do you comment a single line in Perl?

# SingleLineComment

// SingleLineComment

-- SingleLineComment

/* SingleLineComment */

32. In Perl, how do you check if a file exists?

-e operator

-f operator

-d operator

-exists() function

33. Which module is commonly used for database access in Perl?

DBI

SQL::Access

PerlDB

Data::Database

34. What is the purpose of the 'sprintf' function in Perl?

Formats strings

Searches for a pattern in a string

Calculates square root

Sorts elements in ascending order

35. What is the significance of the 'autodie' pragma in Perl?

To automatically die when an error occurs.

To handle autovivification in Perl.

To create custom exceptions.

To optimize regular expressions.

36. What is the purpose of the 'rand' function in Perl?

Generates a random number

Calculates the square root of a number

Rounds a floating-point number

Finds the remainder of division

37. What is the purpose of the 'redo' statement in Perl?

To exit a loop

To restart the current iteration of a loop

To skip to the next iteration of a loop

To undo the last operation

38. How do you check the length of an array in Perl?

len()

size()

count()

scalar(@array)

39. In Perl, how do you open and read a file?

fread()

file_open()

open() and read()

open() and <>

40. What is the purpose of the 'next' statement in Perl?

To exit a loop

To skip to the next iteration of a loop

To jump to a specific line of code

To print a message

Perl MCQ Test 2