C# Object-Oriented Programming Quiz

Welcome to the C# Object-Oriented Programming (OOP) Quiz! This quiz is designed to test your understanding of key concepts in object-oriented programming, specifically in C#. You’ll encounter questions on topics such as objects, classes, constructors, properties, access modifiers, static members, and more. These concepts are fundamental to writing clean, reusable, and maintainable code in C#. Take your time, think through each question carefully, and good luck on your journey to mastering object-oriented programming!

What is a static member in C#?

A member that is only accessible from derived classes.

A member that belongs to the class rather than any instance of the class.

A member that cannot be modified after initialization.

A member that can only be used within a loop.

None

What is a primary constructor in C#?

A constructor whose sole purpose is to assign provided parameters to class properties.

A constructor used for static class members.

A constructor that must be inherited by all derived classes.

A constructor that is executed only once during program execution.

None

What does the following constructor do?

public DemoClass(string name, int age) 
{
 this.name = name;
 this.age = age;
}

It assigns the name and age values to a static field.

It assigns the name and age parameters to the corresponding class fields using the this keyword.

It overrides the default constructor.

It creates a static instance of the class.

None

How do you define a finalizer in C#?

By using the new keyword.

By using the static keyword.

By using the this keyword.

By using the tilde (~) character followed by the class name.

None

What is the role of a finalizer in C#?

To create static members for a class.

To initialize fields when an object is created.

To clean up resources when an object is destroyed.

To handle inheritance between classes.

None

What is the this keyword used for in C#?

To override a method.

To access static members of the class.

To refer to the current instance of the class.

To call a method from another class.

None

What is the purpose of the constructor in the following C# code?

public BankAccount(string accountName, int accountNumber)
{
 _accountName = accountName;
 _accountNumber = accountNumber;
}

To initialize the _accountName and _accountNumber fields when a new BankAccount object is created.

To create an instance of the class with default values.

To display the bank account details.

To perform calculations for the bank account.

None

Which keyword is used to declare a method as a static method in C#?

protected

readonly

private

static

None

What is the purpose of a method in a C# class?

To perform specific tasks or operations within the class.

To define the access level of class members.

To allow inheritance from other classes.

To store data permanently in the class.

None

10.

What is the purpose of the readonly keyword in C#?

To make a field accessible only within its class.

To allow a field to be shared across all instances of a class.

To prevent modification of a field after it is initialized.

To create a property that has only a get accessor.

None

11.

How can a static method be accessed in C#?

By using the new keyword.

By creating an instance of the class first.

By calling it directly on the class without creating an instance.

By accessing it through an inherited class.

None

12.

What is an object in object-oriented programming?

A special data type used for storing complex numbers.

A collection of variables and functions stored in memory.

A self-contained module of functionality that can be reused in software applications.

A programming concept for managing large amounts of data.

None

13.

What does the dot notation in C# allow you to do?

Access members of a class or object.

Create an interface.

Declare a new class.

Loop through an array.

None

14.

How do you create an instance of a class in C#?

By calling the constructor directly without new.

Using the new keyword followed by the class name.

Using the class name followed by parentheses.

By using the class keyword.

None

15.

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

To handle inheritance between classes.

To initialize class fields when an object is created.

To modify static members of the class.

To destroy the object when it is no longer needed.

None

16.

What is the role of the get accessor in a property?

It prevents access to the private field.

It deletes the value stored in the field.

It assigns a value to the private field.

It returns the value of the associated private field.

None

17.

What is the difference between a field and a property in a C# class?

A property must be static, while a field must be instance-based.

A property can only hold numeric values, while a field can hold any data type.

A field is a variable declared directly in the class, while a property provides controlled access to a field.

A field is used only for methods, while a property is used for data.

None

18.

Which of the following is a public field in C#?

protected string name;

private string name;

internal string name;

public string name;

None

19.

How does a property in C# provide access to a private field?

By making the field public.

By using inheritance.

By declaring the field as static.

By using get and set accessors.

None

20.

What is data encapsulation in object-oriented programming?

The practice of restricting access to a class’s internal data by using private fields and public methods.

The process of inheriting from multiple classes.

The process of creating instances of a class.

The practice of making all class members public.

None

21.

Which access modifier allows unrestricted access to a class or its members?

internal

private

public

protected

None

22.

What is the relationship between a class and an object?

A class is an instance of an object.

A class is a blueprint that defines the structure and behavior of an object.

An object is a blueprint for creating multiple classes.

A class is a collection of objects.

None

Time’s up

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