C# MCQ,S

1) You are implementing a C# class that needs to provide different behaviors based on the type of objects it receives. Which feature of C# should you use to achieve this
polymorphic behavior?
Answer choices
Select an option
a) Abstract classes
Interfaces
Inheritance
Delegates
2) You are working on a C# project that requires sending email notifications. Which class or namespace should you use for email operations in C#?
Answer choices
Select an option
a) System.Net.Sockets
b) System.Net.WebSockets
c) System.Net.Mail
d) System.Net.Http

3) You are developing a C# application that needs to serialize objects into XML format. Which class or namespace should you use for XML serialization in C#?
Answer choices
Select an option
a) System.Text.RegularExpressions
b) System.Xml.Serialization
c) System.Xml.Linq
d) System.Web.Services
4) you are implementing a C# class that needs to perform resource cleanup when it is no longer needed. Which interface should your class implement to release
unmanaged resources?
Answer choices
Select an option
a) IDisposable
b) ICloneable
c) IComparable
d) IFormattable
5) You are working on a C# project that requires performing complex operations on collections of objects, such as filtering, sorting, and projecting. Which feature of C#
should you use to achieve this efficiently?
Answer choices
Select an option
LINQ (Language Integrated Query)
Delegates
Reflection
Attributes
6) You are developing a C# application that needs to perform asynchronous operations to avoid blocking the main thread. Which keyword should you
use to define an asynchronous method in C#?
Answer choices
Select an option
1) async
2)await
3)yield
4)defer

7) You are building a C# application that requires implementing custom exception classes to handle specific types of errors. Which class should your custom exception
classes derive from?
Answer choices
Select an option
Exception
ApplicationException
SystemError
Error
8) You are working on a C# project that requires encrypting and decrypting sensitive data. Which class or namespace should you use for cryptographic operations in C#?
Answer choices
Select an option 9) You are developing a C# application that needs to handle and manipulate large datasets efficiently.
Which feature of C# should you use to minimize memory usage and improve performance?
System.Security.Cryptography Answer choices
System.Net.Security Select an option
System.IO.Compression
System.Text.Encoding a) Disposable
b) interface Finalizers
c) Generics
d) Reflection

10) You are developing a C# application that requires efficient data access and manipulation. Which of the following options provides the best
performance for accessing data in a C# program? Answer choices Select an option1) Arrays 2) Lists 3) Dictionaries 4) HashSets

Answer: Arrays
11) Which of the following statements are correct about the C#.NET code snippet given below? (Choose all that apply)

int[ , ] nArr = {{10, 1, 8}, {2, 2, 6}};

Answer choices Select correct option(s)

1) nArr represents an array of 3 rows and 2 columns.

2) nArr.GetUpperBound(1) will yield 2.
3) nArr represents an array of 2 rows and 3 columns.
4) nArr.Length will yield 24.
5) nArr represents 1-D array of 5 integers. nArr.
6) GetUpperBound(0) will yield 1.

12) How would you write an enum variable called WeekDay with values for all week day names?
Answer choices
Select an option
1) enum WeekDay = [Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday]
2) enum WeekDay {"Sunday", "Monday ", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"}
3) enum WeekDay = { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday }
4) enum WeekDay { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday }

13) Which of the following statements about a String is correct?

Answer choices
Select an option
1) Memory for String is allotted on the stack.
2) Depending on the length of the String, it may be allotted on heap or stack.
3) A String object is created by using the statement String s1 = new String;
4) String is created on the heap.

14) Which of the following is NOT a looping structure in C#?

Answer choices
Select an option
1) for
2) while
3) Switch
4) do-while

15) What does the "this" keyword refer to in C#?

Answer choices
Select an option
1) The current object instance.
2) The base class.
3) The derived class.
4) The parent object.

16) What is the output of the following code snippet? 17) What will be the output of the code snippet below?
int x = 5;
int y = 3; int row, column;
int result = x % y; int[,] arr = new int[2, 2];
Console.WriteLine(result);
for (row = 0; row < 2; ++row)
Answer choices {
Select an option for (column = 0; column < 2; ++column)
1) 2 {
2) 1 arr[row, column] = row * 17 + column * 17;
3) 0
4) 3 Console.Write(arr[row, column] + " ");
}
}

Answer choices
Select an option
1) 0 0 34 34
2) 0 17 17 34
3) 0 0 0 0
4) 17 17 0 0
18) Which of the following is the correct way of declaring a char array?
char[] ch1 = new char[5];
char[] ch2 = new char[] { 'a','b','c','d','e'};
char[] ch3 = { 'a', 'b', 'c', 'd', 'e' };
var[] ch4 = { 'a', 'b', 'c', 'd', 'e' };
Answer choices
Select an option
1) 1,2,3
2) 1,3,4
3) 1,2
4) All of the above.

19) What is the output of the following code snippet?

class IndexerList
{
public IndexerList (int count)
{
for (int i = 0; i <= 3; i++)
{
array.Add(0);
}
}
}
ArrayList array = new ArrayList();
public object this[int index]
{
get
{
if (index < 0 || index >= array.Count) { return null; } else { return (array[index]); } } set { array[index] = value; } } public int Count { get; set; } } class
Program { static void Main(string[] args) { IndexerList list1 = new IndexerList (3); list1[0] = "123"; list1[1] = "abcd"; list1[2] = "wxyz"; int nCount = 2;
for (int i = 0; i <= nCount; i++) Console.WriteLine(list1[i]); Console.ReadLine(); } }

Answer choices
Select an option
1) 123 abcd wxyz
2) Compile-time error
3) Runtime error
4) 0

20) What is the output of the following program?

int n1 = 1, n2 = 3, n3 = 3;
switch (n1 + n2 + n3)
{
case 0: case 2: case 4: ++n1; n3 += n2; break; case 1: case 3: case 5:
--n1; n3 -= n2; break; default: n1 += n2; break; }
Console.WriteLine(n1 + "\n" + n2 + "\n" + n3);
Answer choices
Select an option
1) 5,3,3
2) 4,3,3
3) 2 4,3,2
4) 4, 3, 2

21) Which of the following are value types? 22) Which is the correct declaration for a nullable integer?
(Choose all that apply) Answer choices

Answer choices Select correct option(s)

Select correct option(s)
a. Nullable(int) i = null;
1) string b. Nullable<int> i = null;
2) int c. int i = null;
3) Decimal d. int<Nullable> i = null;
4) System.Drawing.Point
23) Which of these pieces of code will give error while compiling?
(Choose all that apply)
Answer choices

Select correct option(s)

a. var vTemp = null;

b. string strVal = null; var tmp = strVal;
c. var strNull = (string)null;
d. var v = new object();

24) Which of the following would allow an implicit conversion?

(Choose all that apply)

Answer choices

Select correct option(s)

a. Int16 to Int32
b. Int 32 to Int 16
c. Int16 to double
d. Double to Int16

25) Which of the following statements are correct? (Choose all that apply)
a) It is possible to assign values of any type to variables of type object.
b) When a value type is converted to object, it is known as boxing.
c) When an object is converted to a value type, it is known as boxing.
d) Boolean variable cannot be assigned to null. When a value type is boxed, an entirely new object must be allocated and constructed.
Answer choices
Select correct option(s)
a. 2, 5
b. 1, 5
c. 2,4
d. 3, 4
26) Which of the following statements is correct about Bitwise | operator? (Choose all that apply)
Answer choices
Select correct option(s)
a. The | operator can be used to put OFF a bit.
b. The | operator can be used to Invert a bit.
c. The | operator can be used to check whether a bit is OFF.
d. The | operator can be used to put ON a bit.

27) Which of the following is NOT a valid C# data type?

Answer choices
Select correct option(s)
a) int
b) float
c) double
d) string[]

28) What keyword is used to define a constant variable in C#?

Answer choices
Select correct option(s)
a) var
b) readonly
c) const
d) static
29) The output of the following program would be
int i = -15;
for(; ;)
{
Console.WriteLine("{0}", i);
if (i >= -25)
{
i -= 5;
}
else break;
}
Answer choices

Select an option

a. Compile-time error
b. 15, 10, 5, 0, -5
c. -15, -20, -25, -30
d. None of the above

30) What is the output of the following code snippet:

class Control
{ static void Main(string[] args)
{ Control ctrl = new Program();
ctrl.FindOutput(); }
void PrintOutput ()
{ int num; for (num = 10; num <= 15; num++)
{ while (Convert.ToBoolean(num))
{ do { Console.WriteLine(1);
if (!Convert.ToBoolean(a >> 1)) break; }
while (Convert.ToBoolean(1)); break; } } } }

Answer choices
Select an option
a) 1 1 1 1…..infinite times
b) Exception
c) 0 0 0……infinite times
d) 1 1 1 1 1 1

31) What is the output of the following code snippet:

static void Main(string[] args)
{
int j = 25; string str = (j++ > 15) ? "Mumbai" : (j++ < 25) ? "Delhi" : "Chennai"; Console.WriteLine(str); }

Answer choices

Select an option

a. Compile-time error
b. Mumbai
c. Delhi
d. Chennai

32) What is the output of the following code?

var x; x = 10; Console.WriteLine(x);

Answer choices
Select an option

a. Run-time error
b. 10
c. Compile-time error
d. None of the above
33) What is the output of the following code?
int num1= -2; Int num2 = -1; if (Convert.ToBoolean(num1-- == --num2)) Console.WriteLine("If Condition is True"); else
Console.WriteLine("If Condition is False");

Answer choices
Select an option

a. If Condition is False
b. If Condition is True

34) What is the output of the following code snippet?

static void Main(string[] args) { int i = 1, j = 16; while (++i <= j--) { j++; } Console.WriteLine(i + " " + j); }
Answer choices
Select an option
a. 15, 14
b. 17, 15
c. 16, 15
d. 16, 14

35) Which of the following is an example of an access modifier in C#?

Answer choices

Select an option
a) this
b) base
c) sealed
d) private

36) What is the correct syntax for declaring a class in C#?

Answer choices
Select an option
a) class MyClass
b) new class MyClass
c) void class MyClass
d) MyClass class

37) What is the purpose of the "using" statement in C#?

Answer choices
Select an option
a) It imports namespaces.
b) It creates objects.
c) It defines variables.
d) It performs arithmetic operations.

38) What does the "static" keyword mean in C#?

Answer choices
Select an option
a) It specifies that a variable is constant.
b) It indicates a method can be called without creating an instance of the class.
c) It restricts access to a member within the same assembly.
d) It marks a class as abstract.

39) Which of the following variable names are allowed? (Choose all that apply)
Answer choices
Select correct option(s)

a. 6Emp_name
b. _Empname2
c. @stringEmpName
d. name-Emp
40) What does the acronym "C#" stand for?
Answer choices
Select correct option(s)

a) C Sharp
b) Computer Science
c) Common Syntax
d) Code Language
41) Which of the following modifiers can be used to prevent inheritance?

Answer choices
Select correct option(s)

a) Static
b) Constant
c) Sealed
d) final
42) Which Feature of OOP encourages the code reusability?

Answer choices
Select correct option(s)

a. is – a relationship
b. has – a relationship
c. Sealed class
d. static class

43) Which of the following statements is correct?

Answer choices
Select correct option(s)

a. Base class pointer cannot point to derived class.

b. Derived class pointer cannot point to base class.
c. Pointer to derived class cannot be created.
d. Pointer to base class cannot be created.

44) Which of the following statements are true of struct type in C#

Answer choices
Select correct option(s)

a. A structure is a reference type.

b. In structure, memory is allocated on heap.
c. Structures do not support inheritance.
d. Structure members cannot have null values.

45) Which of the following is the correct signature of overload “+” operator?

Answer choices
Select correct option(s)

a) public Test operator + (Test tst1, Test tst2)

b) public abstract operator + (Test tst1, Test tst2)
c) public static Test operator + (Test tst1, Test tst2)
d) All of the above
46) Which of the following can the methods of a class differ, to be treated as overloaded methods? Choose all that apply.

Answer choices
Select correct option(s)

a. Types of arguments
b. Return type of the methods
c. No. of arguments
d. order of arguments
47) Which of the following statements are true of an abstract class?

Answer choices
Select correct option(s)

a. It is possible to create an object of the abstract class; it must be inherited.

b. You can have abstract as well as non-abstract members in an abstract class.
c. You must declare at least one abstract method in the abstract class.
d. An abstract class is always public.
48) Which of the following members of a class can be declared as virtual in C#?
Static methods
Fields
Properties
Methods
Events.

Answer choices
Select correct option(s)

a) 1,4,2

b) 3,4,5

c) 2,3,4

d) 1,4,5

49) Which of the following statements are true of abstract class and interface?

Answer choices
Select correct option(s)

a. abstract class are to be used if we need to increase reusability in our design.

b. Interfaces support better forward compatibility
c. Abstract method can be used for objects that are closely related whereas interfaces can be used to provide functionality to unrelated classes
d. Interfaces can be used where it is required to define big functions
e. If multiple versions of a component is required abstract classes can be used

50) Which of the following statements are true?

Answer choices
Select correct option(s)

a. A class can implement multiple interfaces.

b. Structures cannot be inherited but it can implement an interface.
c. An interface can contain static data.
d. A class that implements an interface can explicitly implement members of that interface
e. All of the above

51) Which of the following methods is used to append data to an existing file in C#?

a) File.AppendText()
b) File.WriteText()
3) File.AppendAllLines()
4) File.AddText()

52) Which method in C# is used to create a new file?

a) File.New()
b) File.Create()
c) File.Make()
d) File.Generate()

53) A C# application needs to write large amounts of data to a file. What would be the most efficient way to append data to the file?

a) Use File.WriteAllText()
b) Use StreamWriter with the Append option
c) Use File.AppendAllLines()
d) Use File.CreateText()
54) What happens if you try to access a key in a Dictionary<TKey, TValue> that does not exist?

a) A new key-value pair is added

b) The Dictionary returns null
c) A KeyNotFoundException is thrown
d) The Dictionary returns an empty string
55) Which collection should be used when you need to ensure that elements are stored in a first-in, first-out (FIFO) order?

1) ArrayList
2) Stack
3) Queue
4) SortedList

56) A file processing application in C# needs to read data from a file, process it, and write the results to a new file. Which approach would ensure
that the application handles large files efficiently?

1) Read the entire file into memory, process it, and then write the output.
2) Use a StreamReader to read and process the file line by line.
3) Use File.ReadAllLines() and File.WriteAllLines() for reading and writing.
4) Copy the file first, then process the copy.
57) In C#, which method would you use to check if a file exists before attempting to open it?

1) File.Exists()
2) File.Check()
3) File.IsAvailable()
4) File.Ready()

58) Which generic collection in C# is most appropriate for storing a list of items with fast access using an index?

1) List<T>
2) Dictionary<TKey, TValue>
3) Queue<T>
4) Stack<T>

59) Which method is used to copy an existing file to a new file in C#?

1) File.CopyFile()
2) File.Copy()
3) File.Duplicate()
4) File.Replicate()

60) You are tasked with managing a collection of employee records where each employee has a unique ID. Which collection would you choose, and
why?

1) ArrayList - Because it allows for easy addition and removal of records.

2) Dictionary<int, Employee> - Because it allows quick lookups using the unique ID as the key.
3) Queue<Employee> - Because it ensures FIFO order when processing employees.
4) Stack<Employee> - Because it allows LIFO order when processing employees.

61) Which non-generic collection in C# is best suited for key-value pair storage?

1) ArrayList
2) HashTable
3) Stack
4) Queue

62) Which collection in C# is inherently synchronized and thread-safe?

1) ArrayList
2) HashTable
3) List<T>
4) Queue<T>

63) Which method is used to remove a file from the filesystem in C#?

1) File.Delete()
2) File.Remove()
3) File.Destroy()
4) File.Clear()
64) You need to store a collection of elements where duplicates are not allowed, and order does not matter. Which C# collection should you use?

1) List<T>
2) HashSet<T>
3) Dictionary<TKey, TValue>
4) Queue<T>

65) In a multi-threaded C# application, which collection would be safest to use without additional synchronization?

1) ArrayList
2) List<T>
3) ConcurrentDictionary<TKey, TValue>
4) Queue<T>

66) Which sorting algorithm repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order?

1) Bubble Sort
2) Insertion Sort
3) Selection Sort
4) Quick Sort

67) You are tasked with implementing a search function in a large, unsorted dataset that changes frequently. Which algorithm would you choose
and why?

1) Linear Search, because it does not require sorting the dataset.

2) Binary Search, because it is faster with sorted data.
3) Bubble Sort, to sort the dataset before searching.
4) Insertion Sort, because it can handle frequent changes.

68) Which attribute in C# is used to indicate that a method can be overridden by derived classes?

1) [Sealed]
2) [Abstract]
3) [Override]
4) [Virtual]

69) Which sorting algorithm is the most efficient in the average case among the following?

1) Bubble Sort
2) Selection Sort
3) Insertion Sort
4) Merge Sort

70) You are optimizing a sorting algorithm for a dataset where the number of elements is small, and the array is already mostly sorted. Which
algorithm should you choose, and why?

1) Bubble Sort, because it can efficiently handle nearly sorted data.

2) Selection Sort, because it selects the smallest element.
3) Insertion Sort, because it is efficient with nearly sorted data.
4) Merge Sort, because it is the fastest in general.

71) During a code review, you notice that a fellow developer used a binary search algorithm on an unsorted list. What should be your
recommendation and why?

1) Suggest sorting the list before using binary search, as it requires sorted data.
2) Recommend switching to linear search, as it works on unsorted data.
3) Advise using bubble sort before the binary search for better performance.
4) Propose using merge sort instead of binary search.

72) You need to implement a function that filters and processes a collection of data asynchronously in C# 8.0. Which feature would be most
appropriate?

1) Async Streams, to handle asynchronous data processing.

2) Tuples, to manage multiple return values.
3) Switch Expressions, for concise conditional logic.
4) Pattern Matching, to filter data efficiently.
73) Which searching algorithm divides the dataset in half with each comparison?

1) Linear Search
2) Binary Search
3) Bubble Sort
4) Selection Sort
74) In which scenario is a linear search algorithm preferred over a binary search?

1) The list is sorted.

2) The list is unsorted.
3) The list contains many elements.
4) The list is in descending order.

75) What is the main advantage of using tuples in C# 7.0?

1) They provide a way to define anonymous types.

2) They enable methods to return multiple values.
3) They replace arrays in data structures.
4) They simplify pattern matching.

76) While implementing a new feature using C# 8.0, you encounter a situation where a reference type might be null. Which feature would you use
to handle this, and how?

1) Nullable Reference Types, by explicitly marking the variable as nullable.

2) Local Functions, to encapsulate the null-check logic.
3) Tuples, to return a default value in case of null.
4) Pattern Matching, to check for null values.
77) What is the key difference between async streams introduced in C# 8.0 and traditional IEnumerable?

1) Async streams do not support LINQ operations.

2) Async streams return elements asynchronously.
3) IEnumerable can handle exceptions, but async streams cannot.
4) Async streams are only available in .NET Core.
78) Which of the following is a new feature introduced in C# 7.0?

1) Nullable Reference Types

2) Local Functions
3) Async Streams
4) Switch Expressions

79) Which of the following is not a benefit of using pattern matching in C# 7.0?

1) Reduces the need for casting

2) Simplifies complex conditional logic
3) Eliminates the need for exception handling
4) Enhances code readability

80) In C# 8.0, which feature helps handle potentially null reference types more effectively?

1) Pattern Matching
2) Local Functions
3) Nullable Reference Types
4) Tuples

80) In C# 8.0, which feature helps handle potentially null reference types more effectively?

1) Pattern Matching
2) Local Functions
3) Nullable Reference Types
4) Tuples
81) Which of the following is not a feature of asynchronous programming in C#?

1) Async methods can be awaited.

2) Async methods block the main thread.
30 Async methods can return Task or Task<T>.
4) Async methods allow non-blocking operations.

82) In C#, which keyword allows you to define a method parameter that will return data back to the caller?

1) ref
2) out
3) in
4) var

83) During a code review, you find that a developer used reflection to access a private field in a class. What should be your recommendation and
why?

1) Suggest using public properties instead, as reflection can bypass encapsulation.

2) Recommend leaving the code as is because reflection is necessary for accessing private members.
3) Advise using the dynamic keyword to access the field instead of reflection.
4) Propose modifying the field to be public for easier access
84) Which delegate type should you use when a method does not return a value?

1) Func
2) Predicate
3) Action
4) EventHandler
85) Which of the following methods is used to inspect metadata using reflection in C#?

1) GetType()
2) ToString()
3) GetHashCode()
4) Equals()

86) In which scenario would you use the ref keyword in C#?

1) When you want to pass a variable by value.

2) When you need to modify the argument passed into the method.
3) When you want to pass a read-only parameter.
4) When you want to define an anonymous method.

87) You are implementing a multi-threaded application in C#. Which approach would you choose to safely update a shared resource across
multiple threads?

1) Use the lock statement to synchronize access to the resource.

2) Use Task.Run to execute the operation asynchronously.
3) Use reflection to inspect the state of the resource.
4) Use out parameters to pass the resource between threads.

88) Which of the following is a key characteristic of a delegate in C#?

1) Delegates are value types.

2) Delegates cannot point to multiple methods.
3) Delegates are type-safe function pointers.
4) Delegates can only be used with static methods.

89) What is the main purpose of using lambda expressions in C#?

1) To create complex data structures.

2) To write inline expressions or anonymous methods.
3) To define new types at runtime.
4) To perform complex mathematical operations
90) A method in your application needs to perform a long-running computation while keeping the UI responsive. Which feature of C# would you
use?

1) Use async and await to run the computation asynchronously.

2) Use reflection to inspect the progress of the computation.
3) Use lambda expressions to simplify the computation logic.
4) Use multicast delegates to distribute the computation across methods.

91) You are asked to refactor a method that contains repetitive type-specific logic. How would you optimize this using generics?

1) Create a generic method that can handle different types without duplication.
2) Use reflection to dynamically determine the types at runtime.
3) Use delegates to pass the specific logic as parameters.
4) Implement threading to handle each type separately.

92) Which of the following is a benefit of using Func delegates in C#?

1) They can return any type of value.

2) They are limited to methods with no parameters.
3) They simplify exception handling.
4) They cannot be used with lambda expressions.
93) You need to create a method that filters a list of objects based on a specific condition. Which delegate would you use, and why?

1) Func, because it allows returning a value based on the condition.

2) Action, because it allows for executing a method without returning a value.
3) Predicate, because it is specifically designed for filtering with a boolean condition.
4) EventHandler, because it is used for handling events.

94) What is the main advantage of using generic methods in C#?

1) They can store values of any data type.

2) They allow you to create type-safe methods that work with any data type.
3) They simplify the code by eliminating the need for method overloading.
4) They are more efficient than non-generic methods.
95) What is the advantage of using multicast delegates in C#?

1) They can store multiple values of different types.

2) They allow a delegate to call multiple methods in a single invocation.
3) They reduce memory usage by combining multiple methods into one.
4) They can only be used with static methods.

96) In unit testing, what is the purpose of the [Test] attribute in NUnit?

1) To skip the test case

2) To mark a method as a unit test that NUnit will run
3) To assert the test case
4) To log test results to a file

97) You are tasked with testing a method that calculates discounts based on user membership levels. Which of the following strategies would you use to
ensure comprehensive test coverage?

1) Write a single test case for the most common membership level.
2) Write multiple test cases, including edge cases like the highest and lowest membership levels.
3) Use only positive test cases to confirm the method works under normal conditions.
4) Skip testing edge cases, as they are unlikely to occur.

98) Which of the following is true about test fixtures in NUnit?

1) They must contain at least one [Test] method.

2) They can only contain one [Test] method.
3) They do not support setup or teardown methods.
4) They can only be used with MSTest.
99) What is the primary purpose of unit testing in software development?

1) To test the entire system end-to-end

2) To ensure that individual units or components of a program work as intended
3) To validate the performance of the software
4) To check the security vulnerabilities in the code

100) When mocking a dependency in a unit test, what is the primary purpose of using a mocking framework like Moq?

1) To replace a real object with a controlled substitute to test the interaction between objects
2) To test the actual database operations
3) To create complex UI elements
4) To generate random data for tests

101) Which assertion method would you use to verify that two values are equal in a unit test?

1) Assert.IsTrue()
2) Assert.IsNull()
3) Assert.AreEqual()
4) Assert.Fail()

102) Which of the following is a popular unit testing framework for .NET?

1) JUnit
2) NUnit
3) Selenium
4) TestNG

103) In Test-Driven Development (TDD), what is the correct sequence of steps?

1) Write code, Write test, Refactor

2) Write test, Write code, Refactor
3) Refactor, Write code, Write test
4) Write code, Refactor, Write test

104) During a code review, a tester points out that your unit tests are tightly coupled to the implementation details of the code. What should you do to
improve the tests?

1) Refactor the tests to focus on the public API of the code rather than internal implementation details.
2) Increase the number of assertions in each test.
3) Add more mocking to simulate the implementation details.
4) Write tests that directly access private fields and methods.

105) What is the purpose of the [SetUp] attribute in a unit test?

1) To define a method that runs after each test

2) To set up a condition that skips the test
3) To define a method that runs before each test
4) To teardown any setup after the test is complete

106) You need to verify that a method throws an exception when invalid data is provided. Which NUnit assertion would you use, and why?

1) Assert.Throws, because it checks that a specific exception is thrown.

2) Assert.AreEqual, because it verifies that the exception message matches.
3) Assert.IsTrue, because it confirms the method returns a boolean.
4) Assert.Catch, because it captures all exceptions for further inspection.

107) What is the difference between Assert.Throws and Assert.Catch in NUnit?

1) Assert.Throws only catches unhandled exceptions, while Assert.Catch can catch all exceptions.
2) Assert.Throws verifies that an exception is thrown, while Assert.Catch captures the exception for further inspection.
3) Assert.Throws is for async methods, while Assert.Catch is for sync methods.
4) There is no difference; they are interchangeable.
108) You are working on a Test-Driven Development (TDD) project. After writing a failing test and then implementing the code to pass the test, what is
your next step?

1) Delete the test case since it has passed.

2) Refactor the code to improve its structure while ensuring the test still passes.
3) Move on to the next feature without changing anything.
4) Add more assertions to the test case.

109) Which attribute is used to run a specific test multiple times with different input values in NUnit?

1) [TestCase]
2) ) [TestFixture
3) [Repeat]
4) [Retry]

110) A developer wrote a unit test that passes when run individually but fails when run as part of a test suite. What could be a possible reason?

1) The test depends on the order of execution.

2) The test is too complex to run in a suite.
3) The test framework does not support suite execution.
4) The test is not configured with a proper timeout.

111) What is a key difference between .NET Core and .NET Framework?

1) .NET Framework is open-source, while .NET Core is not.

2) .NET Core supports Windows Forms, while .NET Framework does not.
3) .NET Core is cross-platform, while .NET Framework is Windows-only.
4) .NET Core does not support cloud-based development.

112) You are building a .NET Core application where the requirement is to serve static files like images, CSS, and JavaScript. Which approach should
you use to meet this requirement?

1) Configure the application to use the UseStaticFiles() middleware.

2) Embed the static files within assembly resources.
3) Host the static files on a CDN.
4) Create a separate controller to handle static files.

113) What does the following Razor Page code output when accessed?

@page
@model IndexModel
<h1>Hello, @Model.Message!</h1>

@functions {
public string Message { get; set; } = "ASP.NET Core";
}

1) Hello, ASP.NET Core!

2) Runtime Exception
3) Hello, World!
4) Compilation Error

114) A new developer on your team asks why .NET Core is chosen for cross-platform development instead of the traditional .NET Framework. Which
reason should you give?

1) .NET Core supports WinForms, which is not available in .NET Framework.

2) .NET Framework is deprecated in favor of .NET Core.
3) .NET Core is optimized for mobile application development.
4) .NET Core is lighter and can run on Linux, Windows, and macOS.

115) During a code review, you notice that a developer is manually writing response headers in a .NET Core application. What should be the correct
approach to manage response headers efficiently?

1) Use middleware to handle response headers globally.

2) Use Web.config to manage headers.
3) Continue manually writing headers as it gives more control.
4)Manage response headers in the controller's action methods.
116) How can you serve static files in an ASP.NET Core application?

1) By manually handling requests in controllers.

2) By enabling static file support in web.config.
3) By using the StaticFileServer class.
4) By using the UseStaticFiles() middleware.

117) What is middleware in ASP.NET Core?

1) A static file server.

2) A function that can process HTTP requests and responses.
3) A database connection handler.
4) A library that provides data access layers.

118) Which of the following is a benefit of using .NET Core?

1) Does not support asynchronous programming.

2) Requires less memory compared to .NET Framework.
3) Limited to Windows platform.
4) Requires Visual Studio to run.

119) public void Configure(IApplicationBuilder app)

{
app.Use(async (context, next) =>
{

await context.Response.WriteAsync("First Middleware");

await next.Invoke();
});
app.Run(async (context) =>
{
await context.Response.WriteAsync("Second Middleware");
});
}

1) Second Middleware
2) Second MiddlewareFirst Middleware
3) First MiddlewareSecond Middleware
4) First Middleware

120) You need to build a simple web application using .NET Core that should be portable across different operating systems. What steps will you take?

1) Use Windows-specific libraries for maximum performance.

2) Use .NET Framework to ensure compatibility.
3) Install .NET Core SDK and use Razor Pages or MVC for the application.
4) Install Visual Studio and build the application using ASP.NET Web Forms.

121) What will be the output of the following code?

public class Program

{
public static void Main(string[] args)
{
Console.WriteLine("Hello, .NET Core!");
}
}

1) Compilation Error
2) Hello, .NET Core!
3) Runtime Exception
4) Hello, World!
122) Which command is used to create a new .NET Core project?

1) dotnet new <template>

2) dotnet start
3) dotnet create project
4) dotnet new project

123) Your application is experiencing delays when serving large static files to users. What is a recommended approach to improve the performance?

1) Increase the server's CPU and memory.

2) Use asynchronous processing in the controller actions.
3) Compress the files before sending them to the client.
4) Enable caching for static files through middleware.

124) What is the result of accessing a Razor Page with this handler?
public class IndexModel : PageModel
{
public void OnGet()
{
ViewData["Message"] = "Welcome to Razor Pages";
}
}

1) Compilation Error
2) The page will show "Welcome to Razor Pages"
3) The page will not render anything.
4) The page will show "Hello, World!"

125) What will the following middleware do in an ASP.NET Core application?

public void Configure(IApplicationBuilder app)
{
app.Use(async (context, next) =>
{
await context.Response.WriteAsync("Middleware 1");
await next.Invoke();
});

app.Run(async (context) =>

{
await context.Response.WriteAsync("Middleware 2");
});
}

1) Outputs "Middleware 2".

2) Throws a runtime error.
3) Outputs "Middleware 1Middleware 2".
4) Outputs "Middleware 1".