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

public
private
internal
protected

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

To define a constant value
To define a variable that is shared among all instances
To define a method that cannot be overridden
To define a method that is specific to an instance

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What is the default value of an uninitialized bool variable in C#?

TRUE
FALSE
null
undefined

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What is the extension of a .NET assembly?

.dll
.exe
Both
.com

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

To provide a handle to a thread
To prevent multiple threads from accessing a resource
To release a thread from waiting
To end the execution of a thread

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Which of these classes allows a collection to grow or shrink dynamically?

Array
LinkedList
List
ArrayList

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

To define a new method
To override a base class method
To allow a method to be overridden
To prevent a method from being overridden

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Which of the following statements is true about .NET assembly?

It is always a DLL
It is always an EXE
It can be either DLL or EXE
It is a namespace

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Which of the following is true about 'const' keyword in C#?

The value can be changed at runtime
The value cannot be changed at runtime
It defines a method
It defines a variable that can be changed

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What is the main advantage of using properties in C#?

Type safety
Performance
Encapsulation
None of the above

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Which of the following is a value type in .NET?

System.String
System.Collections.ArrayList
System.Int32
System.Object

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Which of the following is NOT a .NET data provider?

SQL Server
OLE DB
XML
Oracle

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What does the 'finally' block do in exception handling?

It executes only when an exception occurs
It executes only when no exception occurs
It executes regardless of an exception
It stops the execution of the catch block

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Which of the following is true about 'ref' keyword in C#?

It allows passing a value by reference
It allows passing a reference by value
It allows passing a value by value
It allows passing a reference by reference

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How do you mark a method as asynchronous in C#?

Using the 'async' keyword
Using the 'await' keyword
Using the 'thread' keyword
Using the 'task' keyword

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

To hide a method
To define a new method
To override a base class method
To extend a class

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Which keyword is used to overload a method in C#?

override
new
overload
extends

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Which of these is a valid statement to define a nullable type?

int? num
Nullable<int> num
Both
None

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How do you prevent a class from being inherited in C#?

By using the 'sealed' keyword
By using the 'final' keyword
By using the 'static' keyword
By using the 'readonly' keyword

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Which of the following is true about an abstract class?

It can be instantiated
It cannot be inherited
It can contain abstract methods
It cannot contain non-abstract methods

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

To pass an unknown number of parameters
To define optional parameters
To define named parameters
To define output parameters

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Which of the following classes is immutable?

String
StringBuilder
List
Dictionary

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What is the maximum size of a Decimal in C#?

4 bytes
8 bytes
16 bytes
32 bytes

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What is the base class for all exceptions in .NET?

System.Exception
System.ApplicationException
System.SystemException
System.Runtime.InteropServices.ExternalException

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

String is mutable
StringBuilder is immutable
StringBuilder is mutable
Both are immutable

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Which of the following is NOT a valid access modifier in C#?

public
protected internal
internal protected
private

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How do you define a read-only property in C#?

public int MyProperty { get; }
public int MyProperty { get; set; }
public readonly int MyProperty { get; }
public int MyProperty { get { return _myProperty; } }

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

To create a lambda expression
To define a delegate
To return multiple values from a method
To simplify the implementation of an iterator

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

To check the type of an object
To cast an object to a different type
To compare two objects
To define a new type

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What is the use of 'throw' keyword in C#?

To catch an exception
To create an exception
To throw an exception
To log an exception

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