MCQs on Object-Oriented Programming in Perl | Perl

Explore the fundamentals of Object-Oriented Programming (OOP) in Perl. Dive into concepts like classes, objects, methods, and constructors to create scalable, modular, and reusable Perl code effortlessly.

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Introduction to OOP Concepts (10 Questions)

1. What does OOP stand for?
   A) Object-Oriented Programming
   B) Object Operational Processing
   C) Organized Object Programming
   D) Object-Oriented Processing
2. Which feature is central to OOP?
   A) Functional programming
   B) Encapsulation
   C) Inline scripts
   D) Regular expressions
3. What does encapsulation achieve in OOP?
   A) Combines data and methods into a single unit
   B) Increases code size
   C) Provides dynamic function calls
   D) Eliminates inheritance
4. Which OOP principle allows code reuse by creating subclasses?
   A) Polymorphism
   B) Encapsulation
   C) Inheritance
   D) Abstraction
5. What does polymorphism enable in Perl OOP?
   A) The same method name to perform different tasks
   B) Prevents function overloading
   C) Ensures type checking
   D) Disables inheritance
6. Which feature hides implementation details from users?
   A) Encapsulation
   B) Inheritance
   C) Polymorphism
   D) Abstraction
7. In Perl, OOP is implemented using what?
   A) Packages
   B) Classes
   C) Objects
   D) All of the above
8. Which keyword is used to create an instance of a class?
   A) new
   B) create
   C) initialize
   D) define
9. In Perl, which of the following is an example of a “class”?
   A) A package
   B) A module
   C) Both A and B
   D) A function
10. Which Perl pragma helps enforce strict OOP conventions?
    A) strict
    B) warnings
    C) strict::Object
    D) OOP::strict

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Creating Classes and Objects (10 Questions)

11. How is a class defined in Perl?
    A) Using the class keyword
    B) By creating a package
    C) Using the object keyword
    D) Using class and object together
12. What does the bless function do in Perl?
    A) Turns a reference into an object
    B) Initializes a class variable
    C) Imports a module
    D) Binds a function to a module
13. What is typically passed as the first argument to a method?
    A) Package name
    B) Class name or object reference
    C) Method name
    D) Module name
14. How do you create an object in Perl?
    A) $object = Class->new();
    B) $object = new Class();
    C) $object = bless {};
    D) All of the above
15. What data type does bless work with?
    A) Scalars
    B) Arrays
    C) Hashes or references
    D) Functions
16. In Perl, a constructor is typically implemented using which method?
    A) init
    B) build
    C) new
    D) create
17. How do you access an object method in Perl?
    A) $object->method();
    B) method->object();
    C) $object.method();
    D) call $object->method;
18. What is the purpose of @ISA in Perl OOP?
    A) Manages inheritance between classes
    B) Stores all object properties
    C) Defines encapsulation rules
    D) Enables method overloading
19. Which of the following is a valid object initialization in Perl?
    A) $self = {}; bless $self, $class;
    B) $self = \%data; bless $self;
    C) bless {};
    D) All of the above
20. How can you check if an object is an instance of a specific class?
    A) ref($object) eq 'Class';
    B) isa($object, 'Class');
    C) Class::is($object);
    D) object->isa('Class');

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Using Methods and Constructors (10 Questions)

21. Which is the default constructor name in Perl?
    A) build
    B) construct
    C) new
    D) initialize
22. What happens if a constructor is not explicitly defined?
    A) Perl throws an error
    B) Objects cannot be created
    C) No constructor is required in Perl
    D) Default constructor must be imported
23. How are methods defined in Perl?
    A) Using the sub keyword
    B) Using method keyword
    C) As anonymous functions
    D) By prefixing with @
24. How are private methods conventionally named in Perl?
    A) With a prefix _ (underscore)
    B) Using uppercase letters
    C) With a .priv suffix
    D) Enclosed in {}
25. What does $self represent in a method?
    A) The object or class the method is called on
    B) A reference to the method
    C) The data type of the class
    D) A variable storing method names
26. How do you override a method in Perl?
    A) Redefine it in a subclass
    B) Use @ISA to change method behavior
    C) Directly edit the superclass
    D) Call the parent method explicitly
27. Which of the following ensures that methods are inherited?
    A) The @EXPORT array
    B) The @ISA array
    C) Using use in the child class
    D) Defining all methods in the parent class
28. What does $object->can('method') do?
    A) Checks if the object has the specified method
    B) Executes the specified method
    C) Converts a method into a class variable
    D) Generates the method for the object
29. How do you call a parent class method from a subclass?
    A) SUPER::method()
    B) Parent::method()
    C) $self->method(SUPER)
    D) call SUPER->method()
30. Which module provides advanced OOP capabilities in Perl?
    A) Moose
    B) Moo
    C) Mouse
    D) All of the above

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Answers Table

QNo	Answer (Option with Text)
1	A) Object-Oriented Programming
2	B) Encapsulation
3	A) Combines data and methods into a single unit
4	C) Inheritance
5	A) The same method name to perform different tasks
6	D) Abstraction
7	D) All of the above
8	A) new
9	C) Both A and B
10	A) strict
11	B) By creating a package
12	A) Turns a reference into an object
13	B) Class name or object reference
14	D) All of the above
15	C) Hashes or references
16	C) new
17	A) $object->method();
18	A) Manages inheritance between classes
19	D) All of the above
20	A) ref($object) eq 'Class';
21	C) new
22	B) Objects cannot be created
23	A) Using the sub keyword
24	A) With a prefix _ (underscore)
25	A) The object or class the method is called on
26	A) Redefine it in a subclass
27	B) The @ISA array
28	A) Checks if the object has the specified method
29	A) SUPER::method()
30	D) All of the above