Object-Oriented Programming Quizzes for Sixth Form Computer Science

Question 1

In object-oriented programming, what is polymorphism and how does it enhance code reusability and adaptability?

Accepted Answer

Polymorphism enables objects of different classes to respond to the same message in unique ways, promoting code reusability and adaptability.

Answer

Polymorphism allows for creating multiple objects of the same class, enhancing code reusability.

Answer

Polymorphism enables objects to change their type during runtime, increasing code adaptability.

Question 2

In object-oriented programming, compare and contrast class-based and prototype-based programming paradigms. Discuss their key features, benefits, and drawbacks.

Accepted Answer

Class-based programming uses classes and inheritance, while prototype-based programming uses prototypes and delegation.

Accepted Answer

Class-based programming is statically typed, while prototype-based programming is dynamically typed.

Answer

Class-based programming is more efficient than prototype-based programming.

Answer

Class-based programming is more flexible than prototype-based programming.

Question 3

What is a key concept in object-oriented programming?

Accepted Answer

Data Hiding

Answer

Global Variables

Answer

Sequential Code

Answer

No Inheritance

Question 4

What is a potential drawback of object-oriented programming?

Accepted Answer

Increased code complexity

Answer

Increased code reusability

Answer

Improved code maintainability

Answer

Enhanced code security

Question 5

Which of the following is a potential drawback of object-oriented programming?

Accepted Answer

Increased complexity

Answer

Reusability

Answer

Maintainability

Answer

Improved performance

Question 6

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

Accepted Answer

Global variables

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 7

Which of the following is a disadvantage of object-oriented programming?

Accepted Answer

Increased code complexity

Answer

Increased code reusability

Answer

Improved code maintainability

Answer

Enhanced code readability

Question 8

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

Accepted Answer

Sequential execution

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 9

In object-oriented programming, which principle ensures data protection and security?

Accepted Answer

Data encapsulation

Answer

Procedural programming

Answer

Global variables

Question 10

Which characteristic is central to object-oriented programming?

Accepted Answer

Data Hiding

Answer

Unrestricted Global Variable Access

Answer

Exclusive Use of Procedural Programming Methods

Question 11

In Java, how do you declare a method with private access?

Accepted Answer

private void privateMethod() { }

Answer

public void privateMethod() { }

Answer

private void publicMethod() { }

Answer

public private voidMethod() { }

Question 12

Which of these is a core concept in object-oriented programming?

Accepted Answer

Encapsulation

Answer

Multiple inheritance

Answer

Sequential execution

Question 13

Which of the following is **not** a core principle of object-oriented programming?

Accepted Answer

Global Variables

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 14

What is a key characteristic of object-oriented programming?

Accepted Answer

Encapsulation

Answer

Recursion

Answer

Dynamic Typing

Question 15

In Java, what is the primary function of a class?

Accepted Answer

Defining a blueprint for creating objects

Answer

Storing both data and methods

Answer

Controlling the flow of program execution

Answer

Providing a user interface for the program

Question 16

What is a primary advantage of polymorphism in OOP?

Accepted Answer

Objects can behave differently based on their class

Answer

It reduces repeated code

Answer

It improves the readability of code

Answer

It simplifies the process of debugging

Question 17

What is the primary purpose of a constructor in Java?

Accepted Answer

Initializing an object when it is created

Answer

Destroying an object when it is no longer needed

Answer

Setting the values of an object's attributes

Answer

Providing default values for an object's attributes

Question 18

Which of the following is not a characteristic of object-oriented programming?

Accepted Answer

Recursion (functions calling themselves)

Answer

Encapsulation (hiding data)

Answer

Abstraction (hiding implementation details)

Answer

Inheritance (creating new classes from existing classes)

Question 19

What is the key distinction between a class and an object in OOP?

Accepted Answer

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

Answer

An object is a blueprint, while a class is an instance of that blueprint

Answer

A class and an object are the same thing

Answer

There is no difference between a class and an object

Question 20

What is the main purpose of using packages in Java?

Accepted Answer

Organizing and grouping related classes and interfaces

Answer

Hiding the implementation details of classes and interfaces

Answer

Providing a way to share code between different applications

Answer

Improving the performance of the application

Question 21

Which data structure is NOT commonly used in object-oriented programming?

Accepted Answer

Union

Answer

Array

Answer

Linked list

Answer

Hash table

Question 22

What term is used to refer to a function defined within a class?

Accepted Answer

Method

Answer

Attribute

Answer

Constructor

Answer

Property

Question 23

Which access modifier is used to limit access to an attribute from external classes?

Accepted Answer

private

Answer

public

Answer

protected

Answer

final

Question 24

What is the primary purpose of the 'this' keyword in Java?

Accepted Answer

To refer to the current object

Answer

To access static members of the class

Answer

To call a constructor from another constructor

Answer

To pass the current object as an argument to a method

Question 25

What is the primary function of a constructor in OOP?

Accepted Answer

To initialize object properties

Answer

To describe object behavior

Answer

To create object instances

Answer

To delete objects

Question 26

What differentiates an abstract class from an interface in Java?

Accepted Answer

Abstract classes can have implemented methods, while interfaces cannot.

Answer

Interfaces can have implemented methods, while abstract classes cannot.

Answer

There is no difference between abstract classes and interfaces in Java.

Answer

Abstract classes can inherit from interfaces, but not vice versa.

Question 27

Which of the following is NOT an advantage of inheritance in OOP?

Accepted Answer

Increased memory consumption

Answer

Code reusability

Answer

Enhanced flexibility

Answer

Reduced code complexity

Question 28

What is the key difference between method overloading and method overriding?

Accepted Answer

Overloading occurs within the same class, while overriding occurs between parent and child classes.

Answer

Overriding occurs within the same class, while overloading occurs between parent and child classes.

Answer

There is no difference between method overloading and overriding.

Answer

Overloading allows multiple methods with the same name but different parameters, while overriding requires methods to have identical parameters.

Question 29

Which Java access modifier allows class members to be accessed from any class in the same package or any subclass?

Accepted Answer

Protected

Answer

Public

Answer

Private

Answer

Default

Question 30

What is the primary purpose of packages in Java?

Accepted Answer

To organize and group related classes and interfaces

Answer

To control access to classes and interfaces

Answer

To enhance performance

Answer

To avoid name conflicts

Question 31

What is the primary role of a constructor in C++?

Accepted Answer

To initialize object data members

Answer

To define object methods

Answer

To inherit properties from a parent class

Answer

To override virtual methods

Question 32

Which Java code snippet demonstrates inheritance?

Accepted Answer

public class Dog extends Animal {}

Answer

public class Animal implements Dog {}

Answer

public class Dog implements Animal {}

Answer

public class Animal extends Dog {}

Question 33

In Python, what is the distinction between a class and an object?

Accepted Answer

A class defines attributes and methods; an object is an instance of a class

Answer

An object defines attributes and methods; a class is a blueprint for creating objects

Answer

A class is an instance of an object; an object defines attributes and methods

Answer

An object is a blueprint for creating classes; a class defines attributes and methods

Question 34

Which access modifier limits class member accessibility to within the class itself?

Accepted Answer

private

Answer

public

Answer

protected

Answer

default

Question 35

What is the primary purpose of the 'this' keyword in Java?

Accepted Answer

To refer to the current object

Answer

To invoke a constructor from another constructor

Answer

To call a superclass method

Answer

To define a static method

Question 36

Which of the following is not a characteristic of polymorphism?

Accepted Answer

Early binding

Answer

Overloading

Answer

Overriding

Answer

Dynamic binding

Question 37

What is the main purpose of an abstract class in Java?

Accepted Answer

To define methods without implementations

Answer

To serve as a blueprint for concrete classes

Answer

To enforce inheritance

Answer

To create objects directly

Question 38

Which fundamental principle of object-oriented programming involves bundling data and methods together into a single unit?

Accepted Answer

Encapsulation

Answer

Polymorphism

Answer

Abstraction

Answer

Inheritance

Question 39

In OOP, which of the following is NOT a characteristic of a class?

Accepted Answer

Represents a specific instance of an object

Answer

Defines a blueprint for creating objects

Answer

Contains data and methods to operate on that data

Answer

Can inherit properties and behaviors from other classes

Question 40

The process of creating a new object from a class in OOP is known as:

Accepted Answer

Instantiating

Answer

Initialising

Answer

Constructing

Answer

Casting

Question 41

Which access modifier in OOP restricts the visibility of a member variable or method to within the class?

Accepted Answer

private

Answer

public

Answer

protected

Answer

default

Question 42

What is the primary purpose of inheritance in OOP?

Accepted Answer

To enable code and data reuse among classes

Answer

To create new classes with unique features

Answer

To define relationships between objects

Answer

To control the visibility of members in derived classes

Question 43

Which OOP concept describes the ability of an object to respond to different inputs in a customized manner?

Accepted Answer

Polymorphism

Answer

Encapsulation

Answer

Abstraction

Answer

Overloading

Question 44

What is the primary purpose of the 'super' keyword in Java?

Accepted Answer

To invoke the constructor of the superclass

Answer

To access the members of the superclass

Answer

To override methods of the superclass

Answer

To create a new instance of the superclass

Question 45

In object-oriented programming, which concept allows a subclass to inherit attributes and methods from a parent class?

Accepted Answer

Inheritance

Answer

Abstraction

Answer

Composition

Answer

Aggregation

Question 46

What is the primary purpose of a constructor in Java?

Accepted Answer

To initialize an object's state upon creation

Answer

To destroy an object

Answer

To modify an object's existing state

Answer

To return a reference to the newly created object

Question 47

Which of the following data types is appropriate for an object reference variable in Java?

Accepted Answer

Object

Answer

primitive type (e.g., int, float)

Answer

String

Answer

array

Question 48

Which of the following best exemplifies polymorphism in Java?

Accepted Answer

Overriding methods in a derived class to provide specialized behavior

Answer

Creating multiple objects from different subclasses of a common superclass

Answer

Using abstract classes to define a common interface for unrelated classes

Answer

Implementing multiple interfaces in a single class

Question 49

What is the primary function of an interface in Java?

Accepted Answer

To provide a blueprint for concrete classes to implement

Answer

To create new data types

Answer

To facilitate multiple inheritance

Answer

To enforce encapsulation

Question 50

In C++, what is the fundamental distinction between a class and an object?

Accepted Answer

A class is a template, while an object is an instance of that template.

Answer

A class is a concrete entity, while an object is an abstract concept.

Answer

A class is static, while an object is dynamic.

Answer

There is no distinction between a class and an object.

Question 51

Which of the following is a **disadvantage** of object-oriented programming (OOP)?

Accepted Answer

Increased complexity

Answer

Reusability

Answer

Maintainability

Question 52

In object-oriented programming, what is the main advantage of using inheritance?

Accepted Answer

Reusing code

Answer

Shortening development time

Answer

Making programs run faster

Answer

Enhancing program security

Question 53

Which of the following is NOT a key feature of object-oriented programming?

Accepted Answer

Emphasis on step-by-step procedures

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 54

Which of the following is NOT a core principle of object-oriented programming?

Accepted Answer

Recursion

Answer

Encapsulation

Answer

Inheritance

Answer

Polymorphism

Question 55

In Java, which keyword is used to define a class?

Accepted Answer

class

Answer

interface

Answer

abstract

Answer

object

Question 56

What is the primary purpose of using the 'extends' keyword in an object-oriented language?

Accepted Answer

To create a new class that inherits properties and behaviors from an existing class

Answer

To create an interface that extends another interface

Answer

To create an abstract class that extends a concrete class

Answer

To create a method that overrides a method in the parent class

Question 57

Which access modifier allows access to members of a class from within its own package?

Accepted Answer

default

Answer

public

Answer

protected

Answer

private

Question 58

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

Accepted Answer

A constructor initializes an object when it is created, while a method performs specific actions on an existing object

Answer

A method initializes an object when it is created, while a constructor performs specific actions on an existing object

Answer

Constructors and methods are essentially the same thing

Answer

Methods can initialize objects, but constructors cannot

Question 59

Which of the following is a disadvantage of object-oriented programming?

Accepted Answer

Increased complexity

Answer

Reusability

Answer

Maintainability

Answer

Improved performance

Question 60

What is the key distinction between a method and a constructor in OOP?

Accepted Answer

A constructor is invoked during object creation, while a method is invoked on existing objects.

Answer

A constructor can accept arguments, unlike methods.

Answer

A method can return a value, whereas a constructor cannot.

Answer

There is no difference between a method and a constructor.

Question 61

In OOP, what is the primary function of an interface?

Accepted Answer

To establish a contract that classes must adhere to, defining method signatures but not implementations.

Answer

To store data and methods related to a specific concept or entity.

Answer

To represent a tangible, real-world object.

Answer

To restrict access to sensitive data.

Question 62

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

Accepted Answer

To refer to the current object within a method or constructor.

Answer

To invoke a constructor from another constructor.

Answer

To access static members of a class.

Answer

To pass an object as an argument to a method.

Question 63

Which of the following is NOT a characteristic of object-oriented programming (OOP)?

Accepted Answer

Global variables

Answer

Encapsulation

Answer

Inheritance

Answer

Modularity

Question 64

Which of the following is a key feature of object-oriented programming?

Accepted Answer

Encapsulation

Answer

Recursion

Answer

Dynamic typing