Object-Oriented Programming for Year 9 ICT: Interactive Quizzes and Learning

Question 1

In OOP, what is the key distinction between a method and a data member?

Accepted Answer

Methods represent actions or operations that can be performed on objects, while data members store data or information associated with objects.

Answer

Data members represent actions or operations that can be performed on objects, while methods store data or information associated with objects.

Answer

There is no fundamental difference between methods and data members in OOP.

Answer

Methods can only be defined in parent classes, while data members can only be defined in child classes.

Question 2

Which of the following concepts in OOP allows objects of different classes to respond to the same method call in a manner specific to their own class?

Accepted Answer

Overriding: Redefining a method inherited from a parent class with different implementation.

Answer

Overloading: Defining multiple methods with the same name but different parameters.

Answer

Inheritance: Creating new classes with added capabilities based on existing classes.

Answer

Encapsulation: Bundling data and methods together into a single unit.

Question 3

In OOP, what is the key difference between an abstract class and an interface?

Accepted Answer

Abstract classes can have implemented methods, while interfaces cannot.

Answer

Interfaces can have implemented methods, while abstract classes cannot.

Answer

Abstract classes and interfaces can both have implemented methods.

Answer

Abstract classes and interfaces cannot have implemented methods.

Question 4

In object-oriented programming, which concept enables objects of one class to inherit the properties and methods of another class?

Accepted Answer

Inheritance

Answer

Encapsulation

Answer

Composition

Answer

Polymorphism

Question 5

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

Accepted Answer

To initialize the properties of a newly created object

Answer

To create a new instance of the class

Answer

To inherit properties from a parent class

Answer

To handle events

Question 6

What is the primary goal of unit testing in software development?

Accepted Answer

To test individual units of code to ensure they function as expected

Answer

To test the entire system to ensure it meets requirements

Answer

To debug and fix errors in the code

Answer

To create documentation for the code

Question 7

What is the term for the ability of an object to take on different forms or behaviors depending on its context?

Accepted Answer

Polymorphism

Answer

Encapsulation

Answer

Method overriding

Answer

Interface implementation

Question 8

In object-oriented programming, how are objects linked in a linked list data structure, and how do we access specific objects within the list?

Accepted Answer

Objects are connected using references, allowing us to access specific objects by following these references.

Answer

Objects are stored in contiguous memory locations, and we can directly access any object using its index.

Answer

Objects are linked using pointers, and we can directly access any object in the list using its unique identifier.

Question 9

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

Accepted Answer

Procedural decomposition

Answer

Encapsulation

Answer

Inheritance

Answer

Modularity

Question 10

Which access modifier restricts class attributes and methods to be accessible only within the class itself?

Accepted Answer

private

Answer

public

Answer

protected

Answer

default

Question 11

What is the correct term for creating a new class that inherits properties and methods from an existing class?

Accepted Answer

Inheritance

Answer

Composition

Answer

Encapsulation

Answer

Polymorphism

Question 12

Which of the following is NOT a commonly used design pattern in OOP?

Accepted Answer

Procedural

Answer

Singleton

Answer

Observer

Answer

Builder

Question 13

Explain the fundamental difference between a class and an object in OOP.

Accepted Answer

A class is a blueprint for creating objects, while an object is a specific instance of that class

Answer

An object is a blueprint for creating classes, while a class is a specific instance of that object

Answer

A class and an object are the same thing

Answer

There is no difference between a class and an object

Question 14

Which of the following is a key feature of polymorphism in OOP?

Accepted Answer

The ability for objects of different classes to respond to the same message in different ways

Answer

The ability for objects to inherit properties and methods from other objects

Answer

The ability for objects to be created and destroyed dynamically

Answer

The ability for objects to have multiple states

Question 15

In Object-Oriented Programming (OOP), which feature enables different methods within a class to share the same name but have unique sets of parameters?

Accepted Answer

Method Overloading

Answer

Method Overriding

Answer

Polymorphism

Question 16

In object-oriented programming, what does an object typically represent?

Accepted Answer

A real-world entity with properties and behaviors

Answer

A collection of data and methods

Answer

A blueprint for creating objects

Answer

A set of instructions for the computer

Question 17

Which of the following is NOT an advantage of object-oriented programming?

Accepted Answer

Simplicity

Answer

Encapsulation

Answer

Reusability

Answer

Modularity

Question 18

What is the main purpose of inheritance in object-oriented programming?

Accepted Answer

To reuse code and functionality from existing classes

Answer

To create new classes with different attributes

Answer

To create new classes with similar attributes

Answer

To prevent access to protected data members

Question 19

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

Accepted Answer

To define a contract that classes must implement

Answer

To create new classes with different attributes

Answer

To reuse code and functionality from existing classes

Answer

To provide a way to access private data members

Question 20

What are the key characteristics of object-oriented programming?

Accepted Answer

Encapsulation, inheritance, and polymorphism

Answer

Inheritance

Question 21

In object-oriented programming, what is a class?

Accepted Answer

A blueprint or template for creating objects

Answer

A set of instructions that can be executed

Question 22

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

Accepted Answer

Increased complexity

Answer

Improved maintainability

Question 23

What is the purpose of a constructor in Java?

Accepted Answer

To initialise an object when it is created

Answer

To define the behaviour of an object

Question 24

What is the purpose of a class in OOP?

Accepted Answer

To define a blueprint for creating objects with specific properties and behaviors

Answer

To store data and methods that can be shared among multiple objects

Answer

To create instances of objects that can interact with each other

Answer

To handle user input and output

Question 25

What is the relationship between a parent class and its child class in OOP?

Accepted Answer

The child class inherits properties and methods from the parent class

Answer

The parent class inherits properties and methods from the child class

Answer

The classes are independent and do not share any共通点

Answer

The child class shares the same memory space as the parent class

Question 26

What is the primary purpose of a constructor in OOP?

Accepted Answer

To initialize an object's state upon its creation

Answer

To create an object and allocate memory for it

Answer

To define the object's class and its properties

Answer

To store the object's data and methods

Question 27

Which concept is considered a fundamental building block in OOP?

Accepted Answer

Classes and objects

Answer

Functions and procedures

Answer

Variables and arrays

Answer

Loops and conditionals

Question 28

How are classes and objects related in OOP?

Accepted Answer

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

Answer

An object defines the blueprint, while a class is a specific instance of that blueprint

Answer

They are completely unrelated concepts

Answer

They are interchangeable terms

Question 29

Which of the following is a fundamental characteristic of object-oriented programming (OOP)?

Accepted Answer

Encapsulation

Answer

Sequential execution

Answer

Imperative syntax

Answer

Declarative programming

Question 30

In object-oriented programming, what is the primary role of a class?

Accepted Answer

To serve as a blueprint for creating objects with defined attributes and behaviors

Answer

To perform mathematical operations

Answer

To control the flow of a program's execution

Answer

To store data in a structured format

Question 31

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

Accepted Answer

Instantiation

Answer

Inheritance

Answer

Encapsulation

Answer

Polymorphism

Question 32

Which of the following is NOT considered an advantage of using object-oriented programming?

Accepted Answer

Increased code complexity

Answer

Improved code reusability

Answer

Increased flexibility

Answer

Enhanced maintainability

Question 33

In the context of OOP, what is a specialized type of object that inherits from a more general type of object called?

Accepted Answer

Subclass

Answer

Superobject

Answer

Interface

Answer

Instance

Question 34

What is the key difference between inheritance and composition in OOP?

Accepted Answer

Inheritance creates an 'is-a' relationship, while composition creates a 'has-a' relationship.

Answer

Inheritance can be used for multiple inheritance, while composition cannot.

Answer

Inheritance is static, while composition is dynamic.

Question 35

What is the main purpose of a constructor in an object-oriented program?

Accepted Answer

To initialise an object's attributes

Answer

To control the flow of execution

Answer

To define an object's methods

Answer

To inherit attributes from a parent class

Question 36

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

Accepted Answer

To allow objects to respond differently to the same message

Answer

To improve code efficiency

Answer

To enforce data encapsulation

Answer

To restrict access to specific methods

Question 37

Which of the following is a recommended best practice when designing object-oriented programs?

Accepted Answer

Follow the SOLID principles

Answer

Minimize the use of abstraction

Answer

Avoid using inheritance

Answer

Use only static methods

Question 38

What is the relationship between a superclass and a subclass in object-oriented programming?

Accepted Answer

A superclass is a parent class, while a subclass is a child class

Answer

A superclass is static, while a subclass is dynamic

Answer

A superclass contains methods, while a subclass contains attributes

Answer

A superclass is abstract, while a subclass is concrete

Question 39

What is the main function of an interface in object-oriented programming?

Accepted Answer

To define a contract that a class must implement

Answer

To prevent access to specific methods

Answer

To provide multiple inheritance

Answer

To enhance code efficiency

Question 40

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

Accepted Answer

Initializing the object's state

Answer

Terminating the object's execution

Answer

Defining the object's behavior

Answer

Declaring the object's variables

Question 41

Which of the following modifiers can be applied to class members to restrict access?

Accepted Answer

private

Answer

protected

Answer

static

Answer

public

Question 42

What is the difference between a class and an object?

Accepted Answer

A class is a blueprint, an object is an instance

Answer

A class is a property, an object is a function

Answer

A class is a method, an object is a data type

Answer

A class is an object, an object is a class

Question 43

Which of the following is an example of inheritance?

Accepted Answer

A Dog class inheriting from an Animal class

Answer

A Printer class using a Scanner class

Answer

A Teacher class having a Student class as a member variable

Answer

A Book object containing a Page object

Question 44

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

Accepted Answer

Enabling objects to respond to different method calls differently

Answer

Improving program efficiency

Answer

Enhancing code reusability

Question 45

Which of the following is NOT a valid data type in Java?

Accepted Answer

StringArray

Answer

int

Answer

String

Answer

boolean

Question 46

What is the output of the following Java code: System.out.println(5 + 3 * 2);

Accepted Answer

11

Answer

51

Answer

8

Answer

10

Question 47

Which of the following is a valid loop structure in Java?

Accepted Answer

for

Answer

while

Answer

loop

Answer

repeat

Question 48

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

Accepted Answer

It is the entry point of the program

Answer

It handles the program's input and output

Answer

It initializes the program's variables

Answer

It defines the program's user interface