MCQ Exam Test

Q1

What does the attr_accessor method do in Ruby OOP?

A Creates constructor methods
B Creates only a writer method
C Creates only a reader method
D Creates both reader and writer methods for class attributes

Q2

What does the term "object" refer to in OOP?

A A method in a class
B A variable in a class
C An instance of a class
D A module in a class

Q3

What is the purpose of the include keyword in Ruby classes?

A To create a new instance
B To define a new method
C To inherit from another class
D To mix in methods from a module into a class

Q4

What is the significance of the initialize method in Ruby classes?

A It defines class variables
B It defines class methods
C It is automatically called when a new object is created and allows initialization of instance variables
D It defines instance methods

Q5

What is the main advantage of using OOP principles in programming?

A Modularity and reusability
B Improved performance
C Simplicity and ease of use
D Reduced memory usage

Q6

What is the main principle behind object-oriented programming?

A Polymorphism
B Encapsulation
C Objects
D Inheritance

Q7

What does polymorphism allow in OOP?

A Objects of the same class to have different methods
B Objects of different classes to be treated as objects of a common superclass
C Objects of the same class to be treated as objects of different classes
D None of the above

Q8

What does the term "class" refer to in OOP?

A A variable in an object
B A method in an object
C An instance of an object
D A blueprint for creating objects

Q9

What does inheritance allow in OOP?

A A class to override instance methods
B A class to access private methods
C A class to be instantiated
D A class to inherit properties and behaviors from another class

Q10

Which OOP principle promotes reusability and reduces redundancy in code?

A Inheritance
B Abstraction
C Polymorphism
D Encapsulation

Q11

What is the purpose of the super keyword in Ruby OOP?

A Returns the superclass
B Calls the same method in the superclass
C Initializes a superclass object
D None of the above

Q12

Which OOP principle emphasizes the hiding of implementation details and showing only necessary features?

A Polymorphism
B Encapsulation
C Abstraction
D Inheritance

Q13

What does the term "inheritance" mean in Object-Oriented Programming?

A A mechanism by which a class can create multiple instances of another class
B A mechanism by which a class can hide implementation details from another class
C A mechanism by which a class can inherit properties and behaviors from another class
D A mechanism by which a class can override methods from another class

Q14

What is the purpose of the attr_accessor method in Ruby classes?

A To define constructor methods for class attributes
B To define only a writer method for class attributes
C To define both reader and writer methods for class attributes
D To define only a reader method for class attributes

Q15

What is the primary purpose of a constructor in a Ruby class?

A To initialize instance variables
B To define class methods
C To create new instances of the class
D To define getter and setter methods

Q16

In Ruby, which keyword is used to define a private method?

A private def
B def method.private
C def private
D private

Q17

What is the purpose of inheritance in OOP?

A To hide the implementation details
B To allow a class to inherit properties and behaviors from another class
C To restrict access to certain methods
D None of the above

Q18

Which concept in Object-Oriented Programming allows objects of different classes to be treated as objects of a common superclass?

A Encapsulation
B Inheritance
C Abstraction
D Polymorphism

Q19

What is polymorphism in OOP?

A The ability to hide implementation details
B The ability to restrict access to certain methods
C The ability for objects of different classes to be treated as objects of a common superclass
D The ability to create multiple instances

Q20

What is the significance of the attr_writer method in Ruby classes?

A Defines only reader methods for class attributes
B Defines only writer methods for class attributes
C Defines constructor methods for class attributes
D None of the above

Q21

Which concept in OOP allows objects to exhibit multiple behaviors based on their types or class?

A Abstraction
B Inheritance
C Encapsulation
D Polymorphism

Q22

Which concept in OOP promotes reusability and reduces redundancy in code?

A Encapsulation
B Polymorphism
C Abstraction
D Inheritance

Q23

What is the difference between attr_reader, attr_writer, and attr_accessor in Ruby?

A attr_reader defines both reader and writer methods, attr_writer defines only reader methods, and attr_accessor defines only writer methods
B attr_reader defines both reader and writer methods, attr_writer defines only writer methods, and attr_accessor defines only reader methods
C attr_reader defines only writer methods, attr_writer defines both reader and writer methods, and attr_accessor defines only reader methods
D attr_reader defines only reader methods, attr_writer defines only writer methods, and attr_accessor defines both

Q24

What is the purpose of the self keyword in Ruby?

A Refers to the current instance of the class
B Refers to the superclass of the class
C Refers to the class itself
D Refers to the class constructor

Q25

What is the purpose of abstraction in OOP?

A To hide the complex implementation details and only show the necessary features
B To expose all the implementation details
C To restrict access to public methods
D To define class methods

ruby - Part 23

What does the attr_accessor method do in Ruby OOP?

What does the term "object" refer to in OOP?

What is the purpose of the include keyword in Ruby classes?

What is the significance of the initialize method in Ruby classes?

What is the main advantage of using OOP principles in programming?

What is the main principle behind object-oriented programming?

What does polymorphism allow in OOP?

What does the term "class" refer to in OOP?

What does inheritance allow in OOP?

Which OOP principle promotes reusability and reduces redundancy in code?

What is the purpose of the super keyword in Ruby OOP?

Which OOP principle emphasizes the hiding of implementation details and showing only necessary features?

What does the term "inheritance" mean in Object-Oriented Programming?

What is the purpose of the attr_accessor method in Ruby classes?

What is the primary purpose of a constructor in a Ruby class?

In Ruby, which keyword is used to define a private method?

What is the purpose of inheritance in OOP?

Which concept in Object-Oriented Programming allows objects of different classes to be treated as objects of a common superclass?

What is polymorphism in OOP?

What is the significance of the attr_writer method in Ruby classes?

Which concept in OOP allows objects to exhibit multiple behaviors based on their types or class?

Which concept in OOP promotes reusability and reduces redundancy in code?

What is the difference between attr_reader, attr_writer, and attr_accessor in Ruby?

What is the purpose of the self keyword in Ruby?

What is the purpose of abstraction in OOP?

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