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

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

inherit

final

sealed

abstract

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

function

method

def

public

3. What is 'LINQ' in C#?

A programming language for developing Windows applications.

A query language for querying databases in C#.

A tool for drawing user interfaces in C#.

A way to declare variables in C#.

4. Which C# data type is used to represent a single character?

char

string

byte

int

5. What is 'asynchronous programming' in C#?

A technique for running code sequentially.

A method for executing code in parallel.

A way to write code that can perform non-blocking operations and continue executing other tasks.

A way to optimize database queries in C#.

6. 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.

7. 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

8. What is the purpose of 'interface' in C#?

To define a contract that classes must implement.

To specify the access modifiers for class members.

To define a base class for inheritance.

To define namespaces in C#.

9. What is the purpose of the 'using' directive in a C# program?

To declare variables

To define classes

To import namespaces

To create objects

10. What keyword is used to define a method that does not return any value in C#?

void

null

none

empty

11. What is a 'delegate' in C#?

A pointer to a function.

A reference to a class instance.

A collection of key-value pairs.

A keyword for declaring variables.

12. What is the primary purpose of the 'using' statement in C#?

To define a new variable

To import namespaces

To create a loop

To declare a constant

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

static void myMethod() { }

void static myMethod() { }

public myMethod() { }

static public void myMethod() { }

14. In C#, which type of loop is best suited for iterating over arrays and collections?

for loop

while loop

do-while loop

switch loop

15. Which C# keyword is used to exit a loop prematurely?

break

continue

return

exit

16. Which C# operator is used to perform logical AND between two Boolean values?

17. What is the C# operator for multiplication?

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

public

private

protected

internal

19. What is the difference between 'sealed' and 'abstract' classes in C#?

'sealed' classes cannot be inherited, while 'abstract' classes are meant to be inherited and cannot be instantiated.

'sealed' classes are meant to be inherited and cannot be instantiated, while 'abstract' classes cannot be inherited.

'sealed' classes and 'abstract' classes are the same in C#.

There is no such thing as 'sealed' or 'abstract' classes in C#.

20. What is 'polymorphism' in C#?

A technique for encrypting data in C#.

A design principle that allows objects of different types to be treated as objects of a common base type.

A method for overloading operators in C#.

A way to define multiple constructors in a class.

21. What is the C# syntax for a switch statement?

switch (condition) { case 1: break; default: break; }

if (condition) { } else { }

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

while (i < 10) { }

22. 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

23. What is the syntax for a single-line comment in C#?

// This is a comment

# This is a comment

-- This is a comment

/* This is a comment */

24. In C#, what is the purpose of the 'StringBuilder' class?

To define variables

To build strings efficiently

To create loops

To perform mathematical operations

25. What is the purpose of the 'this' keyword in C#?

To create a new instance of a class

To reference the current instance of a class

To declare a constant

To define a new variable

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

create

new

instance

instantiate

27. How do you declare a variable in C#?

var myVar = 10;

int myVar = 10;

float myVar;

string myVar = 'Hello';

28. What does C# stand for?

C Sharp

C Plus

C Hash

C Number

29. How do you define a constant value in C#?

const myValue = 10;

constant myValue = 10;

var myValue = 10;

readonly myValue = 10;

30. Which C# keyword is used to indicate that a method can be overridden in a derived class?

override

virtual

abstract

sealed

31. Which C# keyword is used to exit a method without returning a value?

break

return

exit

continue

32. What is the purpose of the 'base' keyword in C#?

It is used to access the base class's constructor.

It is used to define a base class for inheritance.

It is used to access the base class's static members.

It is used to specify access modifiers for class members.

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

char

string

character

letter

34. What is the purpose of 'extension methods' in C#?

To extend the duration of method execution.

To add new methods to existing types without modifying their source code.

To optimize the performance of methods in C#.

To create methods with variable numbers of parameters.

35. What is the C# operator for logical AND?

36. What is 'reflection' in C#?

It is a feature that allows classes to inherit from multiple base classes.

It is a technique for creating dynamic objects at runtime.

It is a mechanism for examining and interacting with the metadata of types, objects, and assemblies.

It is a way to implement garbage collection in C#.

37. What is the purpose of the 'break' statement in a switch statement in C#?

To exit the switch statement

To continue to the next case

To skip the current case

To return a value

38. Which C# data type is used to store decimal numbers with high precision?

int

double

decimal

float

39. What is the purpose of the 'using' statement in C# when working with resources like files or database connections?

To declare a variable

To import namespaces

To create an object

To ensure proper resource cleanup

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

To perform arithmetic operations

To check the type of an object

To define a new variable

To create an array

C# MCQ Test 2