Quiz - C# Mastery Hub

1 What is a class in C#?

A blueprint or template for creating objects

A variable that stores data

A method that performs calculations

A type of loop

2 What is an object in C#?

A class that contains methods

An instance of a class

A type of variable

A method that returns a value

3 Which keyword is used to create an object in C#?

create

new

object

instance

4 What is a field in a C# class?

A method that returns data

A variable declared inside a class

A property that validates data

A constructor that initializes data

5 What is the purpose of a property in C#?

To store data without validation

To provide controlled access to fields with get and set accessors

To create methods that return data

To define the constructor of a class

6 What is an auto-implemented property in C#?

A property that requires manual backing field implementation

A property where the compiler automatically generates the backing field

A property that cannot be modified

A property that only has a getter

7 What does the 'init' accessor do in a property?

Allows the property to be set only during object initialization

Makes the property read-only

Makes the property write-only

Allows the property to be set at any time

8 What is a method in C#?

A block of code that performs a specific task

A variable that stores data

A type of class

A property that validates data

9 What is method overloading in C#?

Having multiple methods with the same name but different parameters

Having methods with different names

Having methods in different classes

Having methods that return different types

10 What is the purpose of the 'params' keyword in C#?

To define a parameter as optional

To allow a method to accept a variable number of arguments

To make a parameter read-only

To pass parameters by reference

11 What is a constructor in C#?

A method that is called when an object is created

A method that is called when an object is destroyed

A property that initializes data

A field that stores data

12 What is constructor chaining in C#?

Calling multiple constructors in sequence

One constructor calling another constructor in the same class using : this()

Creating multiple objects with the same constructor

Inheriting constructors from a base class

13 What is encapsulation in C#?

Hiding internal data and exposing only what's needed

Creating multiple methods with the same name

Inheriting from a base class

Sharing data between classes

14 Which access modifier makes a member accessible only within the same class?

public

private

protected

internal

15 What is the purpose of the 'protected' access modifier?

Allows access only within the same class

Allows access within the same class and derived classes

Allows access anywhere in the same assembly

Allows access from anywhere

16 What is inheritance in C#?

A class inheriting properties and methods from another class

A class inheriting from multiple classes

A class inheriting from an interface

A method inheriting from another method

17 Which keyword is used to call a base class constructor in C#?

base

this

super

parent

18 What is the purpose of the 'sealed' keyword in C#?

To prevent a class from being inherited

To prevent a method from being overridden

To make a class abstract

To make a method virtual

19 What is polymorphism in C#?

The ability to have many forms

The ability to have many classes

The ability to have many methods

The ability to have many objects

20 What is the difference between 'virtual' and 'override' in C#?

'virtual' allows a method to be overridden, 'override' replaces the method implementation

'virtual' replaces the method, 'override' allows a method to be overridden

They are the same thing

'virtual' is used for properties, 'override' is used for methods

21 What is an abstract class in C#?

A class that cannot be instantiated and can contain abstract methods

A class that can only be inherited

A class that contains only static methods

A class that cannot be inherited

22 What is an interface in C#?

A contract that defines methods without implementation

A class that contains implementation

A type of abstract class

A method that can be overridden

23 What is the main difference between an abstract class and an interface?

Abstract classes can have implementation, interfaces cannot (before C# 8)

Abstract classes cannot be inherited, interfaces can

Interfaces can have fields, abstract classes cannot

There is no difference

24 What is the difference between static and instance members in C#?

Static members belong to the class, instance members belong to objects

Static members belong to objects, instance members belong to the class

They are the same thing

Static members can only be used in static classes

25 When should you use static methods?

When the method doesn't need access to instance data

When the method needs access to instance data

When you want to create multiple instances

When you want to override the method

26 What are generics in C#?

A way to define classes and methods with type parameters

A way to create objects without types

A type of collection

A way to avoid type safety

27 What is the purpose of generic constraints in C#?

To restrict the types that can be used as type arguments

To make generics faster

To allow any type to be used

To create multiple instances

28 What does the 'S' in SOLID stand for?

Single Responsibility Principle

Simple Responsibility Principle

Static Responsibility Principle

System Responsibility Principle

29 What does the 'O' in SOLID stand for?

Open/Closed Principle

Object-Oriented Principle

Overriding Principle

Optimization Principle

30 What does the 'L' in SOLID stand for?

Liskov Substitution Principle

Linear Substitution Principle

Logical Substitution Principle

Language Substitution Principle

31 What does the 'I' in SOLID stand for?

Interface Segregation Principle

Interface Substitution Principle

Implementation Segregation Principle

Inheritance Segregation Principle

32 What does the 'D' in SOLID stand for?

Dependency Inversion Principle

Dependency Integration Principle

Direct Inversion Principle

Data Inversion Principle

Classes & OOP Quiz