Ultimate C Sharp Test - 79+ MCQs: C# test: Evaluate Your Skills with C# Questions and Answers

1. Which C# keyword is used to define a method in a class?

function

method

def

public

2. How do you define a static method in a C# class?

static void myMethod() { }

void static myMethod() { }

public myMethod() { }

static public void myMethod() { }

3. What is 'generics' in C#?

A way to define classes with generic parameters.

A technique for optimizing memory usage in C#.

A method for overriding base class methods.

A way to define custom attributes.

4. What is the entry point of a C# program?

main()

start()

entry()

Main()

5. Which C# keyword is used to indicate that a class cannot be inherited from?

inherit

final

sealed

abstract

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

'ref' parameters are passed by reference and must be initialized before being passed to a method, while 'out' parameters are also passed by reference but can be uninitialized.

'ref' parameters are passed by value and must be initialized before being passed to a method, while 'out' parameters are passed by reference.

'ref' parameters are used for value types, while 'out' parameters are used for reference types.

There is no difference between 'ref' and 'out' parameters in C#.

7. What is the C# syntax for creating a new instance of a class?

new myClass();

create myClass();

instantiate myClass();

instance myClass();

8. What is the purpose of the 'finally' block in a try-catch-finally statement?

To catch exceptions

To handle errors

To execute code regardless of whether an exception is thrown or not

To define variables

9. Which of the following is a reference type in C#?

int

double

string

array

10. In C#, what keyword is used to define a class?

class

define

struct

new

11. What is 'boxing' and 'unboxing' in C#?

Boxing is the process of converting a value type to a reference type, and unboxing is the reverse operation.

Boxing is the process of converting a reference type to a value type, and unboxing is the reverse operation.

Boxing and unboxing are techniques for optimizing memory usage in C#.

Boxing and unboxing are used for handling exceptions in C#.

12. Which C# data type is used to store a single character?

char

string

character

letter

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

It is used for declaring variables.

It defines a namespace for a class.

It ensures that resources are properly disposed of when no longer needed.

It specifies access modifiers for class members.

14. How do you define a property in a C# class?

property myProperty { get; set; }

int myProperty { }

function myProperty() { }

var myProperty = 10;

15. What is the purpose of the 'try', 'catch', and 'finally' blocks in C#?

To define loops

To declare variables

To handle exceptions

To create conditions

16. Which keyword is used to define a class in C#?

function

class

method

interface

17. In C#, what keyword is used to create an instance of a class?

create

new

instance

instantiate

18. What is the C# operator for subtraction?

19. What is the purpose of the 'volatile' keyword in C#?

It indicates that a variable cannot be modified.

It specifies a variable's data type.

It ensures that variable access is synchronized between multiple threads.

It defines a constant value.

20. Which C# keyword is used to handle exceptions?

try

catch

throw

exception

C# MCQ Test 4