C# Online Quiz – Level Beginner

Test your C# skills with mycodeblock.com Online Quiz. This quiz is designed to target beginner-level programmers.

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The quiz contains 20 questions, each correct answer will give you 1 point. To pass the quiz you need to score at least 70% i.e. 14 correct answers.

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QUIZ START

#1. Which of these can be used to concatenate two string objects in C#?

+=

+=

+

+

&&

&&

concat

concat

#2. Which of the following property of Array class checks whether the Array is readonly?

IsFixedSize

IsFixedSize

IsReadOnly

IsReadOnly

Length

Length

None of the above

None of the above

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

String

String

Long

Long

Boolean

Boolean

None of the above

None of the above

#4. When would you use a Dictionary rather than an Array type in your application?

when you need a jagged collection structure

when you need a jagged collection structure

when you need to store values of the same type

when you need to store values of the same type

when you need to store key-value pairs rather than single values

when you need to store key-value pairs rather than single values

when you need an ordered searchable list

when you need an ordered searchable list

#5. Data type of a variable declared using var will be assigned at ______.

Runtime

Runtime

Compile time

Compile time

Anytime

Anytime

Application Initialization time

Application Initialization time

#6. Which statement is true for boxing in C#.NET?

The process of converting value type to refrence type is called boxing.

The process of converting value type to refrence type is called boxing.

The process of converting refrence type to value type is called boxing.

The process of converting refrence type to value type is called boxing.

It is an explicit conversion process.

It is an explicit conversion process.

1 and 3

1 and 3

#7. Which of the following can be used to terminate a while loop and transfer control outside the while loop?

Exit while

Exit while

continue

continue

break

break

None of the above

None of the above

#8. Which of the statement for Static Class is true?

Static Class allows us to divide their properties, methods and events into multiple source files.

Static Class allows us to divide their properties, methods and events into multiple source files.

Static Class is created using the "Sealed" keyword.

Static Class is created using the "Sealed" keyword.

If we want to use Static Class then it must be inherited in a Sub Class.

If we want to use Static Class then it must be inherited in a Sub Class.

Static Class cannot be instantiated, in other words we cannot create an object of that class using the new keyword.

Static Class cannot be instantiated, in other words we cannot create an object of that class using the new keyword.

#9. What is an object in C#?

An instance of a class that includes fields, properties and methods

An instance of a class that includes fields, properties and methods

A class including its variables and functions

A class including its variables and functions

A primitive datatype that can be created only at compile time

A primitive datatype that can be created only at compile time

A value type that can only be used with an abstract class

A value type that can only be used with an abstract class

#10. What is the result of this code snippet? 1 > 2 ? "2 is greater than 1" : "1 is less than 2"

2 is greater than 1

2 is greater than 1

1 is less than 2

1 is less than 2

null

null

None of the above

None of the above

#11. Which of the following is the default access specifier of a class member function?

internal

internal

public

public

protected

protected

private

private

#12. When does the code inside the finally block be executed in a try-catch statement?

If there is an error, it won't execute at all.

If there is an error, it won't execute at all.

Between the try and catch blocks.

Between the try and catch blocks.

After the try and catch blocks.

After the try and catch blocks.

when the finally block overrides the catch block and executes in its place.

when the finally block overrides the catch block and executes in its place.

#13. In interface, which of the following access specifiers can be used?

public

public

private

private

protected

protected

None of the above

None of the above

#14. An array index always starts with _____.

1

1

0

0

-1

-1

none of the above

none of the above

#15. Which of the following is base namespace in the .NET Framework Class Library?

System.IO

System.IO

Object

Object

System.Base

System.Base

System

System

#16. Which code snippet declares an anonymous type named userData?

userData = new {name = "john", age = 32};

userData = new {name = "john", age = 32};

var userData = new {name = "john", age = 32};

var userData = new {name = "john", age = 32};

AType userData = new AType {name = "john", age = 32};

AType userData = new AType {name = "john", age = 32};

Anonymous userData = new Anonymous {name = "john", age = 32};

Anonymous userData = new Anonymous {name = "john", age = 32};

#17. Which of the following statements are not correct about Constructor in C#?

It always has the same name as the name of the class.

It always has the same name as the name of the class.

It cannot be overloaded.

It cannot be overloaded.

It can never return a value.

It can never return a value.

It can never be called explicitly.

It can never be called explicitly.

#18. Which operator can be used to compare two values?

=

=

==

==

++

++

!=

!=

#19. Is C# an alias of C++?

True

True

False

False

#20. Which of the following C# keywords has nothing to do with multithreading?

async

async

await

await

sealed

sealed

lock

lock

Finish

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