C# Quizs

In the C# Quiz Section, every question carries 2 marks. If any question is wrong then 2 marks will be deducted.

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C# Quiz

1 / 50

What does the 'Console.WriteLine()' method do in C#?

Reads input from the console

Writes output to the console

Clears the console screen

Pauses the console application

2 / 50

In C#, what is the purpose of the 'using' statement?

Declares a variable

Defines a loop

Includes a namespace

Creates an object

3 / 50

Which of the following is a value type in C#?

string

int

Array

List

4 / 50

What is the default access modifier for class members in C#?

private

public

protected

internal

5 / 50

In C#, what is the significance of the 'readonly' keyword?

Denote that a method cannot be overridden

Indicate that a variable's value cannot be changed after initialization

Specify that a class cannot be inherited

Mark a class as thread-safe

6 / 50

How can you achieve multiple inheritances in C#?

Use the 'extends' keyword

Use the 'implements' keyword

C# doesn't support multiple inheritances

Use the 'inherits' keyword

7 / 50

How can you declare a constant in C#?

const int x = 5;

readonly int x = 5;

static int x = 5;

final int x = 5;

8 / 50

How can you implement a custom exception in C#?

Inherit from the 'System.Exception' class

Use the 'throw' keyword with a string parameter

Declare a static method named 'Exception'

Utilize the 'CustomException' attribute

9 / 50

How can you implement a singleton pattern in C#?

Use the 'sealed' keyword on the class

Make the constructor private and provide a static method to retrieve the instance

Declare a static variable and initialize it in the class constructor

Use the 'final' keyword on the class

10 / 50

How does C# handle method overloading?

By allowing methods with the same name but different parameter types

By limiting the number of parameters in each method

By preventing methods with the same name

By restricting the return types of overloaded methods

11 / 50

How does C# handle multiple exceptions in a single catch block?

C# does not support multiple exceptions in a single catch block

Catch block can handle any exception type without specifying

Use a comma-separated list of exception types

Use nested try-catch blocks for each exception type

12 / 50

How does C# support polymorphism?

Through method overloading and method overriding

Only through method overloading

Only through method overriding

By using the 'sealed' keyword

13 / 50

How does the 'async' keyword affect a method in C#?

Makes the method asynchronous

Synchronizes the method with the main thread

Specifies that the method is abstract

Marks the method as deprecated

14 / 50

How does the 'using' statement contribute to resource management in C#?

It frees up memory space

It automatically disposes of resources when they go out of scope

It allocates additional resources

It prevents resource leaks

15 / 50

How does the 'using' statement simplify resource management in C#?

Automatically disposes of resources when they go out of scope

Allocates additional memory for resources

Prevents resource leaks by using garbage collection

Explicitly frees up memory space

16 / 50

How is a 'struct' different from a 'class' in C#?

Structs support inheritance, while classes do not

Structs are reference types, while classes are value types

Structs are immutable, while classes are mutable

Structs can have default constructors, while classes cannot

17 / 50

How is exception handling implemented in C#?

try-catch-finally

if-else

switch-case

do-while

18 / 50

How is a delegate different from an event in C#?

Delegates are used for multithreading, while events are not

Delegates can have multiple subscribers, while events cannot

Events are used for multithreading, while delegates are not

Delegates are static, while events are instance-specific

19 / 50

How is the 'sealed' keyword used in C#?

To prevent a class from being instantiated

To indicate that a class cannot be inherited

To hide the implementation details of a class

To make a class abstract

20 / 50

How is the 'var' keyword used in C#?

Declare a variable with an inferred type

Specify a variable as a variant type

Create a variable with a constant value

Define a variable with a dynamic type

21 / 50

How is the 'yield return' statement used in C#?

To exit a loop prematurely

To generate a sequence of values lazily

To yield control to another thread

To initiate an asynchronous operation

22 / 50

In C#, what is the 'base' keyword used for?

Access the base class members

Declare a base variable

Initialize the base class

Specify a base condition in a loop

23 / 50

What does the 'var' keyword represent in C#?

Variable

Variant

Value

Dynamic type

24 / 50

What is the 'this' keyword used for in C#?

Reference the current instance of a class

Reference the base class

Create a new instance of a class

Define a constant value

25 / 50

What is the difference between 'HashSet' and 'List' in C#?

HashSet allows duplicate elements, while List does not

List is unordered, while HashSet is ordered

HashSet can store only integers, while List can store any data type

List is faster for searching elements

26 / 50

What is the difference between 'IEnumerable' and 'IQueryable' in C#?

'IEnumerable' is used for in-memory collections, while 'IQueryable' is used for database queries

'IQueryable' is used for in-memory collections, while 'IEnumerable' is used for database queries

Both are used interchangeably and have no significant difference

'|Enumerable' is used for asynchronous operations, while 'IQueryable' is used for synchronous operations

27 / 50

What is the difference between 'ref' and 'out' parameters in C#?

'ref' parameters must be initialized before use, while 'out' parameters do not

'out' parameters must be initialized before use, while 'ref' parameters do not

Both 'ref' and 'out' parameters are used for the same purpose

'ref' is used for value types, while 'out' is used for reference types

28 / 50

What is the difference between 'StringBuilder' and 'String' in C#?

StringBuilder is immutable, while String is mutable

StringBuilder is faster for concatenating strings

String is faster for concatenating strings

StringBuilder is used for mathematical operations

29 / 50

What is the purpose of the 'Action' delegate in C#?

Represent a method with parameters and return type

Handle exceptions in a method

Provide a mechanism for late binding

Create an asynchronous operation

30 / 50

What is the purpose of the 'async' and 'await' keywords in C#?

Define asynchronous methods

Synchronize threads

Handle exceptions

Create anonymous functions

31 / 50

What is the purpose of the 'Indexer' in C#?

Access elements in a collection using square bracket notation

Create an index for a database table

Implement a binary search algorithm

Define the starting index of an array

32 / 50

What is the purpose of the 'dynamic' keyword in C#?

Define a dynamic array

Declare a dynamic variable

Specify a dynamic exception

Delay the execution of a method

33 / 50

What is the purpose of the 'Dispose' method in C#?

Release unmanaged resources

Initialize a new object

Sort elements in a collection

Convert a string to uppercase

34 / 50

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

Checks if two objects are the same

Checks if an object is of a certain type

Checks if a variable is initialized

Checks if a condition is true

35 / 50

What is the purpose of the 'lock' statement in C#?

Create a thread-safe singleton

Declare a constant value

Synchronize access to a shared resource

Define a recursive function

36 / 50

What is the purpose of the 'nameof' operator in C#?

Retrieve the name of a variable

Determine the type of an object

Get the name of a method

Check if a namespace is defined

37 / 50

What is the purpose of the 'LINQ' in C#?

Manipulate XML documents

Write platform-specific code

Query and manipulate collections of objects

Define database schema

38 / 50

What is the purpose of the 'Lazy<T>' class in C#?

Delay the execution of a method

Lazily initialize an object

Create a thread-safe singleton

Handle exceptions in a lazy manner

39 / 50

What is the purpose of the 'nameof' operator in C#?

Retrieve the name of a variable

Determine the type of an object

Get the name of a method

Check if a namespace is defined

40 / 50

What is the purpose of the 'nameof' operator in C#?

Retrieve the name of a variable

Determine the type of an object

Get the name of a method

Check if a namespace is defined

41 / 50

What is the purpose of the 'Nullable<T>' struct in C#?

Represent a non-nullable value type

Enable value types to be assigned a value of 'null'

Define a nullable reference type

Create an instance of a class

42 / 50

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

Define optional parameters in a method

Pass a variable number of arguments to a method

Specify access modifiers for a method

Create an array of parameters

43 / 50

What is the purpose of the 'partial' keyword in C#?

Define a partial class or interface

Specify a partially abstract class

Create a partially initialized object

Partially execute a method

44 / 50

What is the purpose of the 'StringSplitOptions.RemoveEmptyEntries' parameter in the 'string.Split()' method?

Removes leading and trailing whitespaces

Removes empty entries from the resulting array

Splits the string into lines

Converts the string to uppercase

45 / 50

What is the purpose of the 'Thread.Sleep()' method in C#?

Stop the execution of a thread

Pause the execution of a program

Delay the execution of the current thread for a specified time

Terminate a thread

46 / 50

What is the purpose of the 'using static' directive in C#?

Include a static class

Create an instance of a class

Include static members of a class directly without specifying the class name

Use static variables without initialization

47 / 50

What is the purpose of the 'using' directive in C#?

Include a library or namespace

Declare a variable

Define a class

Allocate memory

48 / 50

What is the purpose of the 'yield' keyword in C#?

Stop the execution of a method

Delay the execution of a method

Generate a sequence of values

Handle exceptions

49 / 50

Which of the following is used for garbage collection in C#?

delete

free

Dispose()

GC.Collect()

50 / 50

Which of the following statements about interfaces in C# is true?

Interfaces can contain fields

A class can implement multiple interfaces with the same method signature

Interfaces can have access modifiers

Interfaces can have constructors

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The average score is 55%

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