.NET Framework MCQ: .NET Framework Multiple Choice Questions and Answers

.NET Framework MCQ with answers and explanations for placement tests and job interviews. These solved .NET Framework MCQ are useful for the campus placement for all freshers including Engineering Students, MCA students, Computer and IT Engineers, etc.

Our .NET Framework MCQ ( .NET Framework multiple Choice Questions ) focuses on all areas of the .NET Framework and its concept. We will regularly update the quiz and most interesting thing is that questions come in a random sequence. So every time you will feel new questions.

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.NET Framework MCQ

.NET Framework MCQ: .NET Framework Multiple Choice Questions and Answers

1 / 44

Assuming y is a value type, which is an example of boxing?

y = (int)thisObject;

int y = 3;

y = (int)thisObject=;3;

object thisObject = y;

2 / 44

Which is a set of features that extends the query capabilities of the .NET language syntax by adding sets of new standard query operators that allow data manipulation, regardless of the data source?

XML

LINQ

XAML

3 / 44

Which of the following selects an anonymous type?

select new { a.Country, a.Region }

select a

select a.Country, a.Region

select { a.Country, a.Region }

4 / 44

Which choice creates an 8-tuple containing prime numbers that are less than 20?

var primes = Tuple.Create(2, 3, 5, 7, 11, 13, 17, 19);

var primes = Tuple.Create(2, 3, 5, 7, 11, 13, 17, 21);

var primes = Tuple.Make(2, 3, 5, 7, 11, 13, 17, 20);

var primes = Tuple.Make(2, 3, 5, 7, 11, 13, 17, 19);

5 / 44

___ pattern works as a bridge between two incompatible interfaces? // wording in question is maybe changed?

Adapter

Bridge

Singleton

Builder

6 / 44

Which is NOT true about lambda statements?

A statement lambda cannot return a value. <= Correct

If a statement lambda has a return value, it has to use a return statement.

A statement lambda requires using curly braces.

A statement lambda can have more than one statement.

7 / 44

When you define an abstract method, how do you use it in a derived class?

Abstract methods cannot be used in derived classes.

In your derived class, overload the method.

In your derived class, override the method.

In your derived class, declare the method as virtual.

8 / 44

What happens when you concatenate two strings?

You cannot concatenate strings in .NET.

The second string object is modified so it contains the concatenated strings.

A third string object is created containing the concatenated strings.

The first string object is modified so it contains the concatenated strings.

9 / 44

When break is used inside two nested for loops, does control come out of the inner for loop or the outer for loop?

It breaks from only the outer loop.

It breaks from all loops.

It breaks from only the inner loop.

It breaks from the outer loop after the second iteration.

10 / 44

You want to include language elements in a program. Which design pattern best fits this objective?

Interpreter

Command

Bridge

Decorator

11 / 44

What is the difference between a stack and queue?

Queues process value types by a top-down hierarchy - first in, first out (FIFO). Stacks follow this principle and insert items from the lower end while deleting ones from the top - last in, first-out (LIFO).

Queues process value types by a top-down hierarchy-last in, first-out (LIFO). Stacks follow this principle and insert items from the lower end while deleting ones from the top-first in, first-out (FIFO).

Stacks process value types by a top-down hierarchy - last in, first-out (LIFO). Queues follow this principle and insert items from the lower end while deleting ones from the top - first in, first-out (FIFO)

Stacks process value types by a top-down hierarchy-first in, first out (FIFO). Queues follow this principle and insert items from the lower end while deleting ones from the top-last in, first-out (LIFO).

12 / 44

What is a namespace?

a group of generic collections—in a logical hierarchy by function—that enable you to access the core functionality you need in your applications

a group of methods—in a logical hierarchy by class—that enable you to access the core functionality you need in .NET

a group of assemblies—in a logical hierarchy by function—that enable you to access the core functionality you need in your applications

a group of classes, structures, interfaces, enumerations, and delegates—organized in a logical hierarchy by function that enable you to access the core functionality you need in your applications

13 / 44

What is CoreCLR?

CoreCLR is a component that allows the highest degree of control when coding; you can Abort(), Suspend() or Resume().

CoreCLR is the .NET execution engine that runs the source code. Special programs called compilers must rewrite it into MSIL.

CoreCLR is the .NET execution engine the runs the source code. Special programs called compilers must rewrite it into IL.

CoreCLR is the .NET execution engine in .NET Core that performs functions like garbage collection and compilation to machine code.

14 / 44

What is an abstract class in .NET?

An abstract class provides a partial implementation for functionality and some abstract or virtual members that must be implemented by the inheriting entities. It can declare fields too.

An abstract class allows developers to create new classes that reuse, extend, and modify the behavior defined in other classes.

An abstract class is responsible for keeping track of what is actually executing and where each executing thread is.

An abstract class declares a contract or behavior that implementing classes require. It may declare only properties, methods, and events with no access modifiers. All the declared members must be implemented.

15 / 44

What is the difference between a SDK (software development kit) and runtime in .NET Core?

The SDK is the "virtual machine" that hosts and runs the application and abstracts all the interaction with the operating system; the runtime usually includes documentation and other help files.

The runtime is the virtual machine that hosts and runs the application and abstracts all the interaction with the operating system; the SDK usually includes documentation and other help files.

The runtime compiles code along with the CLR; the SDK usually includes documentation and other help files

The SDK compiles code along with the CLR; the runtime usually includes documentation and other help files.

16 / 44

What is the difference between System.String and string?

string is used for fied-size strings in C#, while System.String is used for all the strings.

There is no such class as System.String.

There is none—string is an alias for System. String.

System.String is a VB.NET data type, while string is a C# type.

17 / 44

You want to encapsulate a command request as an object. Which design pattern best fits this objective?

Command

Iterator

Facade

Observer

18 / 44

Which group contains all official types of JIT compilations?

Pre-JIT, Quick-JIT, Coll-JIT

Before-JIT, Quick-JIT, Cool-JIT

Pre-JIT, Quick-JIT, Normal-JIT

Pre-JIT, Econo-JIT, Normal-JIT

19 / 44

Where should you store connection string information?

in any file within the namespace of the program

in the view

in configuration files

in the database

20 / 44

Which statement describes a Dispose method?

It defines an execution environment for program code and manages the CLR

It belongs to the IDisposable interface and is used to free resources, such as network connection and files.

It is partially method-compiled code library for use in deployment, versioning, and security.

It is used for encapsulation of collections tied to functions of a class and object.

21 / 44

What is CIL?

Formerly known as MSIL, CIL is a programming language that NET developers use. It represents the lowest possible level for a language that humans can still read.

CIL is an object-oriented programming language that is a partially compiled code that .NET developers will then compile to native machine code.

CIL is used to convert a value type to an object type.

CIL is a compiled code library that Microsoft developed as an open specification. Developers use it for security, versioning, and deployment purposes.

22 / 44

What is a delegate?

A delegate is an object or collection initializer that adds flexibility, readability and maintainability in C#.

A delegate in .NET is similar to a function pointer in C or C++. Using a delegate allows the programmer to encapsulate a reference to a method inside a delegate object.

A delegate is a collection initializer that adds flexibility, readability and maintainability in .NET.

A delegate is an extension method. Using a delegate allows the programmer to add flexibility, readability and maintainability in .NET.

23 / 44

What does CAS stand for and what does it do?

CAS stands for Code Application Secrets and it enables users to restrict, on a very granular level, what hidden code can do according to a level of trust for an application.

CAS stands for Code Access Secrets and it enables users to restrict, on a very granular level, what hidden code can do according to a level of trust.

CAS stands for Cognitive Access Security and it enables users to restrict security logic manipulation.

CAS stands for Code Access Security and it enables users to restrict, on a very granular level, what managed code can do according to a level of trust.

24 / 44

When should a developer use the .NET Standard class library project type?

when you want to increase the .NET API surface area your library can access, and allow only .NET Core apps to be compatible with your library

when you want to increase the number of apps that are compatible with your library, and decrease the .NET API surface area your library can access

when you want to decrease speed but have more features

when you want to increase compilation speed and have fewer features

25 / 44

What is the purpose of CLR?

CLR performs various operations such as security checks, spell checks, assembly loading, and thread management. It provides a secure execution environment for the internet.

CLR sets the rules developers must use for the components that are interlanguage compatible. CLR is reusable across all the .NET-compliant languages.

CLR is a compiler that converts Intermediate Language to a native code.

CLR performs various operations such as memory management, security checks, assembly loading, and thread management. It also provides a secure execution environment for applications.

26 / 44

You want to add responsibilities to object dynamically. Which design pattern best fit this objective?

Decorator

Bridge

Singleton

Facade

27 / 44

You want to create a class of which only a single instance can exist. Which design pattern best fits this objective?

Adapter

Singleton

Bridge

Decorator

28 / 44

Which is NOT true about a read-only variable?

At runtime, its value is evaluated.

It can be either static or an instance member.

It can be initialized at declaration only.

It can be initialized in either the constructor or the declaration.

29 / 44

Which code do you use if you want to trigger a garbage collection in .NET?

Garbage.CleanUp();

System.GC.Clear();

System.GC.Collect();

Garbage.Collect();

30 / 44

You want to separate object construction from its representation. Which design pattern best fits this objective?

Adapter

Bridge

Singleton

Builder

31 / 44

What do code contracts do?

Code contracts are data structures that can operate on demand per requirements.

Code contracts provide a way to specify preconditions, postconditions, and object invariants in your code.

Code contracts contain definitions for a group of related functionalities that a class or a struct can implement.

Code contracts contain data structures for a group of related functionalities that a class or a struct can implement.

32 / 44

What is Kestrel?

an iOS web server initially that was later designed to work with .NET Core

a cross-platform web server ASP.NET Core that is included by default in ASP.NET Core project templates** <= Correct

a cross-platform, open-source web server that starts up web APIs

a free and open-source cross-platform web server software that can communicate with IIS

33 / 44

When would you use asynchronous actions?

to release the quest thread of a I/O operation

to capture the request thread of a I/O operation

to avoid blocking the request thread while waits for an I/O operation

to block the request thread if it waits for an I/O operation

34 / 44

What makes a strong-named assembly?

an assembly with the version specified

a signed assembly

an assembly with culture information

an assembly with the name marked as important

35 / 44

How can you recieve form data without a model binder in a controller action?

public IFormResult ReceivedDataByRequest() { string theName = Request.Forms["theName"]; return View(); }

public IActionResult ReceivedDataByRequest() { string theName = Request.Forms["theName"]; return View(); }

public IFormResult ReceivedDataByRequest() { string theName = Request.Form["theName"]; return View(); }

public IActionResult ReceivedDataByRequest() { string theName = Request.Form["theName"]; return View(); }

36 / 44

Why would you use ahead-of-time (AOT) compilation?

You can deliver a faster startup time, especially in big applications where much code executes on startup.

You have a slow processor.

You have little memory and disk space

The JIT compiler does not have to do a lot of disk I/O actions, which are quite expensive.

37 / 44

What is a thread?

A single operation that does not return a value and that usually executes asynchronously

the basic unit to which an operating system allocate processor time

a series of related tasks or methods that together turn inputs into outputs

a program that is running on your computer

38 / 44

What is the Common Type System (CTS)?

the component of CLR in which .NET Framework provides support for several languages since it contains a type system that is common with all the languages

the component of CLI in which .NET Framework provides support for several languages since it contains a type system that is common with all the languages

the component of CLR that allows you to map the content of a file to the logical address of an application

the component of CLR that enables you to run multiple versions of an application or component and CLR on the same computer at the same time

39 / 44

What is the namespace for caching information in .NET?

System.Data.Caching;

All.System.Caching;

System.Runtime.Caching;

System.Compiler.Caching;

40 / 44

Which is NOT true about a constant variable?

At compile time, the value is evaluated.

Only at declaration can it be initialized.

At runtime, its value is evaluated.

It cannot be static.

41 / 44

Why would Pre-JIT be used by the .NET Framework?

to compile only the methods that are called at runtime and store those methods in cache after execution

to compile complete source code into native code in a single compilation cycle during deployment of the application

to compile only the methods that are called at runtime and then store them in cache for one minute

to compile only the methods that are called at runtime and remove them from memory after execution

42 / 44

What is the single responsibility principle?

Software entities should be open for extension, but closed for modification.

Entities must depend on abstractions, not on concrete implementations.

Objects in a program should be repleaceble with instances of their subtypes without altering the correctness of that programm.

A class should have only a single responsibility - that is, only changes to one part of the software's specification should be able to affect the specification of the class.

43 / 44

What is the dependency inversion principle?

bjects in a program should be replaceable with instances of their subtypes without altering the correctness of that program.

A class should have only a single responsibility—that is, only changes to one part of the software's specification should be able to affect the specification of the class.

Software entities should be open for extension, but closed for modification.

Entities must depend on abstractions, not on concrete implementations. <= Correct

44 / 44

What is an interface in .NET?

An interface provides a partial implementation for functionality and some abstract or virtual members that must be implemented by the inheriting entities. It can declare fields too.

An interface is responsible for keeping track of what is actually executing and where each executing thread is.

An interface allows developers to create new classes that reuse, extend, and modify the behavior defined in other classes.

An interface declares a contract or behavior that implementing classes require. It may declare only properties, methods, and events with no access modifiers. All the declared members must be implemented.

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