Classes and Objects: A Comprehensive Guide for Beginners

Question 1

Which of the following is a key advantage of using classes and objects in programming?

Accepted Answer

Code reusability

Accepted Answer

Improved maintainability

Answer

Reduced memory usage

Answer

Faster program execution

Question 2

Which of these is a key principle of object-oriented programming?

Accepted Answer

Data hiding

Answer

Sequential execution

Answer

Extensive use of global variables

Answer

Focus on top-down design

Question 3

In object-oriented programming, what is the primary purpose of encapsulation?

Accepted Answer

Protecting data from unauthorized access outside the class

Answer

Allowing external access to private data

Answer

Combining data and methods into a single entity

Question 4

In object-oriented programming, what is the purpose of inheritance?

Accepted Answer

Subclasses can inherit and expand on the features and behaviors of their parent class.

Answer

Parent classes can inherit attributes and methods from their subclasses.

Answer

Inheritance is used to create new classes that have no relation to existing classes.

Question 5

When creating an object, how are attributes and methods linked to each instance?

Accepted Answer

Attributes and methods are defined in the class and inherited by each instance.

Answer

Attributes and methods are individually created and assigned to each instance.

Answer

Attributes are inherited, while methods are assigned to each instance.

Question 6

In object-oriented programming, what is the primary purpose of attributes?

Accepted Answer

Attributes are used to define the unique characteristics and properties of individual objects.

Answer

Attributes are solely responsible for data storage within objects.

Answer

Attributes play no significant role in object-oriented programming.

Question 7

What is the primary function of a class in object-oriented programming?

Accepted Answer

To define a template for creating objects

Answer

To store data specific to individual objects

Answer

To specify actions that can be performed on objects

Answer

To create instances of objects

Question 8

Which of the following is NOT an access modifier in the Java programming language?

Accepted Answer

restricted

Answer

public

Answer

private

Answer

protected

Question 9

What is the key difference between a constructor and a method in object-oriented programming?

Accepted Answer

Constructors are invoked when an object is created, while methods are called later.

Answer

Methods are invoked when an object is created, while constructors are called later.

Answer

Constructors have a return type, while methods do not.

Answer

Methods have a return type, while constructors do not.

Question 10

What is the purpose of polymorphism in object-oriented programming?

Accepted Answer

To allow objects to respond differently to the same message

Answer

To prevent objects from responding to the same message

Answer

To ensure that all objects respond to the same message in the same way

Answer

To limit the number of messages that an object can respond to

Question 11

What is the primary purpose of the `main` method in a Java program?

Accepted Answer

To define the starting point of the program

Answer

To store the core logic of the program

Answer

To handle input and output operations

Answer

To create objects and invoke their methods

Question 12

What is the main distinction between a loop and a conditional statement?

Accepted Answer

A loop executes a block of code repeatedly, while a conditional statement executes a block of code only if a certain condition is met.

Answer

A conditional statement executes a block of code repeatedly, while a loop executes a block of code only if a certain condition is met.

Answer

Loops and conditional statements serve the same purpose and can be used interchangeably.

Answer

Loops are used for iteration, while conditional statements are used for selection.

Question 13

Which of the following is **NOT** a fundamental characteristic of object-oriented programming?

Accepted Answer

Flattening data into structures

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 14

Explain the fundamental difference between a class and an object in object-oriented programming.

Accepted Answer

A class is a blueprint or template, while an object is a specific instance of that template

Answer

An object is a blueprint or template, while a class is a specific instance of that template

Answer

A class and an object are essentially the same concept

Answer

An object can exist independently of a class, but a class cannot exist without an object

Question 15

Which of the following options is **NOT** a recognized type of polymorphism in object-oriented programming?

Accepted Answer

Variable overriding

Answer

Method overriding

Answer

Method overloading

Answer

Constructor overloading

Question 16

In Java programming, what is the primary purpose of the 'this' keyword?

Accepted Answer

To refer to the current object within a method or constructor

Answer

To refer to the parent class of the current object

Answer

To refer to the child class of the current object

Answer

To refer to the superclass of the current object

Question 17

In object-oriented programming, what is the term for a blueprint or template used to create objects?

Accepted Answer

Class

Answer

Object

Answer

Method

Answer

Interface

Question 18

Which of the following is considered a data member of a class?

Accepted Answer

Attribute

Answer

Method

Answer

Constructor

Answer

Parameter

Question 19

What is the term for the process of creating an instance of a class?

Accepted Answer

Instantiation

Answer

Inheritance

Answer

Encapsulation

Answer

Polymorphism

Question 20

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

Accepted Answer

To initialize object state

Answer

To define object behaviour

Answer

To provide access to class members

Answer

To create new instances of the class

Question 21

Which of the following is NOT a benefit of using classes and objects?

Accepted Answer

Increased complexity

Answer

Encapsulation

Answer

Reusability

Answer

Improved maintainability

Question 22

What is the primary purpose of polymorphism in object-oriented programming?

Accepted Answer

To allow objects to exhibit different behaviours based on their class

Answer

To restrict access to class members

Answer

To create new instances of classes

Answer

To define the behaviour of objects