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

1. Which function is used to sort an array in Perl?

array_sort()

sort()

order()

arrange()

2. 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.

3. 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

4. Explain the concept of XS in Perl and its use cases.

XS stands for 'eXtended Scripting' and is used for adding JavaScript code to Perl.

XS is a cross-scripting technique in Perl.

XS is a technology for extending Perl with C or C++ code.

XS is a module for handling XML in Perl.

5. What does CGI stand for in Perl programming?

Common Gateway Interface

Computer Graphics Interface

Code Generation Instruction

Conditional Global Invocation

6. 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.

7. What is the purpose of the 'Data::Dumper' module in Perl?

To serialize data structures.

To compress files.

To calculate the size of a file.

To generate random data.

8. In Perl, how do you check if a key exists in a hash?

key_exists()

exists() function

has_key()

defined()

9. 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.

10. Which operator is used for conditional execution in Perl?

? :

if else

switch case

&& ||

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

JSON::Encode

PerlJSON

JSON::Parser

JSON::XS

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

and

13. 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.

14. 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.

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

fread()

file_open()

open() and read()

open() and <>

16. What is the role of the 'Algorithm::Permute' module in Perl?

To handle permutations and combinations.

To optimize regular expressions.

To manage file input/output operations.

To create custom sorting algorithms.

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

@ARGV

$ARGV

%ARGV

&ARGV

18. How do you merge two hashes in Perl?

hash_concat()

merge_hashes()

hash_union()

%hash1, %hash2

19. Which operator is used for exponentiation in Perl?

20. Explain the concept of Perl's 'taint mode' and its significance.

Taint mode is a security feature that prevents execution of untrusted code.

Taint mode is used for validating HTML documents.

Taint mode is a type of lexical scoping in Perl.

Taint mode is a module for handling file input/output operations.

Perl MCQ Test 4