C# mcq(multiple choice) question with answers

C# is a modern, object-oriented programming language developed by Microsoft. It is widely used for developing Windows desktop applications, video games, and mobile applications, as well as web applications and services using the .NET framework. C# features strong typing, automatic memory management, and supports both imperative and functional programming paradigms. It also has built-in support for LINQ (Language Integrated Query) and asynchronous programming.

1. What is the correct syntax for declaring a string in C#?

string s = "Hello World!";

String s = "Hello World!";

string = "Hello World!";

String = "Hello World!";

2. What is the correct syntax for declaring an array in C#?

int numbers = {1, 2, 3, 4};

int[] numbers = {1, 2, 3, 4};

array numbers = {1, 2, 3, 4};

Array numbers = {1, 2, 3, 4};

4. What is the access modifier for a class member that can only be accessed within the same class?

public

private

protected

internal

5. What is the correct syntax for declaring a method in C#?

Function MyMethod() {}

MyMethod void() {}

method MyMethod() {}

void MyMethod() {}

6. What is the correct syntax for a for loop in C#?

for (int i = 0; i < 10; i++)

for i = 0 to 10

for i = 0, i < 10, i++

for i = 0; i <= 10; i += 1

7. What is the purpose of the "using" keyword in C#?

To import a namespace

To create a new object

To define a method

To declare a variable

8. What is the value of a nullable int in C# when it has no value assigned to it?

Null

None of these

9. What is the difference between a value type and a reference type in C#?

Value types are stored on the heap, while reference types are stored on the stack

Value types cannot be null, while reference types can

Reference types cannot be null, while value types can

Value types are stored on the stack, while reference types are stored on the heap

10. What is the purpose of the "var" keyword in C#?

To declare a dynamic type

To declare a constant value

To declare a variable with its type inferred at compile time

To declare a null value

11. What is the difference between the "continue" and "break" keywords in C#?

Break moves to the next iteration of a loop, while continue exits the loop completely

Continue moves to the next iteration of a loop, while break exits the loop completely

Both continue and break exit the loop

Both continue and break move to the next iteration of a loop

12. What is the correct syntax for declaring an integer in C#?

int x = 10;

integer x = 10;

Int x = 10;

Integer x = 10;

13. How do you declare a constant in C#?

int const x = 10;

x = const int 10;

const int x = 10;

const x = int 10;

14. What is the correct syntax for declaring a while loop in C#?

While (condition) {}

(condition) while {}

While {} (condition)

while (condition) {}

15. What is the correct syntax for creating an object in C#?

objectName ClassName = new ClassName();

ClassName objectName = new ClassName();

ClassName = new objectName();

ObjectName class = new ClassName();

16. What is the correct syntax for declaring a switch statement in C#?

Switch (expression) {}

switch (expression) {}

(expression) switch {}

Switch {} (expression)

17. How do you access elements of an array in C#?

arr[index]

arr.index

arr(index)

arr{index}

18. What is the output of the following code?

int x = 10;
int y = x++;
Console.WriteLine(y);

None of these

19. What is the output of the following code?

string str1 = "Hello";
string str2 = "Hello";
if (str1 == str2)
{
    Console.WriteLine("Equal");
}
else
{
    Console.WriteLine("Not Equal");
}

Error

Equal

Not Equal

None of these

20. Which of the following is a valid method to convert a string to an integer in C#?

string.ToInt32(string)

int(string)

int.Parse(string)

Convert.ToInt32(string)

C# mcq(multiple choice) question with answers

C# MCQ (Multiple Choice Question) with answers