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 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.

A member that is only accessible from derived classes.

None

What is a primary constructor in C#?

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

A constructor that is executed only once during program execution.

A constructor that must be inherited by all derived classes.

A constructor used for static class members.

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 creates a static instance of the class.

It overrides the default constructor.

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

None

How do you define a finalizer in C#?

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

By using the new keyword.

By using the static keyword.

By using the this keyword.

None

What is the role of a finalizer in C#?

To clean up resources when an object is destroyed.

To create static members for a class.

To initialize fields when an object is created.

To handle inheritance between classes.

None

What is the this keyword used for in C#?

To override a method.

To call a method from another class.

To refer to the current instance of the class.

To access static members of the 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 create an instance of the class with default values.

To display the bank account details.

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

To perform calculations for the bank account.

None

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

static

protected

readonly

private

None

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

To perform specific tasks or operations within the class.

To allow inheritance from other classes.

To define the access level of class members.

To store data permanently in the class.

None

10.

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

To prevent modification of a field after it is initialized.

To create a property that has only a get accessor.

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

To make a field accessible only within its class.

None

11.

How can a static method be accessed in C#?

By creating an instance of the class first.

By accessing it through an inherited class.

By using the new keyword.

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

None

12.

What is an object in object-oriented programming?

A special data type used for storing complex numbers.

A programming concept for managing large amounts of data.

A collection of variables and functions stored in memory.

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

None

13.

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

Loop through an array.

Declare a new class.

Create an interface.

Access members of a class or object.

None

14.

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

Using the class name followed by parentheses.

By using the class keyword.

By calling the constructor directly without new.

Using the new keyword followed by the class name.

None

15.

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

To destroy the object when it is no longer needed.

To initialize class fields when an object is created.

To modify static members of the class.

To handle inheritance between classes.

None

16.

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

It prevents access to the private field.

It assigns a value to the private field.

It returns the value of the associated private field.

It deletes the value stored in the field.

None

17.

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

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

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#?

public string name;

protected string name;

internal string name;

private string name;

None

19.

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

By using get and set accessors.

By making the field public.

By using inheritance.

By declaring the field as static.

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 practice of making all class members public.

The process of creating instances of a class.

The process of inheriting from multiple classes.

None

21.

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

internal

protected

private

public

None

22.

What is the relationship between a class and an object?

A class is a collection of objects.

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.

None

Time’s up

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