What is the correct way to implement the Dispose pattern in C# for resource cleanup?

The correct answer is A: Implement IDisposable with Dispose method and destructor. The proper Dispose pattern implements IDisposable and uses a finalizer/destructor as a safety net, following the recommended pattern in C#.

Which statement about method overloading in C# is correct?

The correct answer is B: Methods can have the same name if they differ in parameter types or count. Method overloading requires different parameter types, count, or order. Return type alone is not enough. C# fully supports overloading.

In C# 10+, what is the purpose of the 'file-scoped type' modifier?

The correct answer is A: To restrict type visibility to the current file only. The 'file' access modifier (C# 11+) restricts type visibility to the file it's declared in, improving encapsulation at the file level.

Which LINQ method should you use to transform each element of a collection into a new form?

The correct answer is B: Select(). Select() is the LINQ method that projects each element to a new form, similar to map in functional programming languages.

A developer creates an abstract class Account with an abstract method CalculateInterest(). Two derived classes SavingsAccount and CurrentAccount implement this method differently. This scenario best demonstrates which OOP principle?

The correct answer is C: Polymorphism. This is polymorphism - the ability of different derived classes to override the same abstract method with different implementations. While abstraction is also involved, polymorphism is the primary principle being demonstrated.

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C# Programming

C# and .NET for campus placement

76 Q 4 Topics Take Mock Test

Difficulty: All Easy Medium Hard 21–30 of 76

Topics in C# Programming

All Basics & Syntax 100 OOP in C# 100 Collections 71 ASP.NET Basics 19

Q.21 Easy OOP in C#

In C#, what is the primary purpose of using an interface?

A To provide complete implementation of methods

B To define a contract that classes must implement

C To create a concrete object directly

D To restrict inheritance to a single class

Correct Answer: B. To define a contract that classes must implement

EXPLANATION

Interfaces in C# define a set of method and property declarations that implementing classes must provide, establishing a contract without implementation details.

Test

Q.22 Easy OOP in C#

Which of the following is NOT a pillar of OOP in C#?

A Inheritance

B Polymorphism

C Encapsulation

D Compilation

Correct Answer: D. Compilation

EXPLANATION

The four pillars of OOP are Inheritance, Polymorphism, Encapsulation, and Abstraction. Compilation is a language feature, not an OOP principle.

Test

Q.23 Easy OOP in C#

In C#, what is the correct syntax to implement multiple interfaces in a class?

A class MyClass : Interface1, Interface2 { }

B class MyClass implements Interface1, Interface2 { }

C class MyClass : Interface1 : Interface2 { }

D class MyClass inherits Interface1, Interface2 { }

Correct Answer: A. class MyClass : Interface1, Interface2 { }

EXPLANATION

C# uses colon (:) to implement interfaces, and multiple interfaces are separated by commas. The 'implements' keyword is used in Java, not C#.

Test

Q.24 Easy OOP in C#

Which keyword is used to create a class that cannot be instantiated in C#?

A sealed

B abstract

C static

D readonly

Correct Answer: B. abstract

EXPLANATION

The 'abstract' keyword prevents instantiation of a class and forces derived classes to implement abstract members, establishing a contract for subclasses.

Test

Q.25 Easy OOP in C#

What is the primary purpose of encapsulation in OOP?

A To increase code execution speed

B To hide internal implementation details and control access to data

C To reduce memory consumption

D To allow multiple inheritance

Correct Answer: B. To hide internal implementation details and control access to data

EXPLANATION

Encapsulation bundles data and methods together, hiding internal implementation and controlling access through public interfaces, improving maintainability and security.

Test

Q.26 Easy ASP.NET Basics

What does MVC stand for in ASP.NET MVC?

A Model-View-Controller

B Module-Virtual-Component

C Multi-View-Cache

D Main-Variable-Class

Correct Answer: A. Model-View-Controller

EXPLANATION

MVC (Model-View-Controller) is an architectural pattern separating data (Model), presentation (View), and business logic (Controller).

Test

Q.27 Easy ASP.NET Basics

In ASP.NET Core, what is the purpose of the appsettings.json file?

A To store application configuration settings

B To define database schema

C To configure IIS settings

D To manage user authentication only

Correct Answer: A. To store application configuration settings

EXPLANATION

appsettings.json stores application configuration like connection strings, logging levels, and custom settings.

Test

Q.28 Easy ASP.NET Basics

What does CLR stand for in the context of .NET?

A Common Language Runtime

B Compiled Language Resolver

C Common Library Resource

D Core Language Repository

Correct Answer: A. Common Language Runtime

EXPLANATION

CLR (Common Language Runtime) is the virtual machine that executes .NET code, managing memory, security, and type safety.

Test

Q.29 Easy ASP.NET Basics

Which of the following is the latest version of ASP.NET as per 2024-2025?

A ASP.NET Framework 4.8

B ASP.NET Core 8.0

C ASP.NET MVC 5

D ASP.NET Web Forms

Correct Answer: B. ASP.NET Core 8.0

EXPLANATION

ASP.NET Core 8.0 is the latest unified platform as of 2024-2025, replacing the older ASP.NET Framework.

Test

Q.30 Easy ASP.NET Basics

What is the primary purpose of ASP.NET in web development?

A A server-side framework for building dynamic web applications

B A client-side scripting language

C A database management system

D A markup language for creating web pages

Correct Answer: A. A server-side framework for building dynamic web applications

EXPLANATION

ASP.NET is a server-side web application framework developed by Microsoft for building dynamic, interactive web applications.

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