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Total Questions 20
Each question carry 1 mark
Must answer all the questions (otherwise report card will not be generated)
If you dont want to take a test, simply click the check answers button and view all the answers with explanations
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1. You have the following code:
int[] Marks = new int[] { 59, 24, 40, 100, 35, 75, 90 };
You need to get all the marks that are greater than 60. Which code snippet should you use?

A.
var query = Marks.Take(60);
B.
var query = Marks.Where(s => s > 60);
C.
var query = Marks.Any(s => s > 60);
D.
var query = from p in Marks
where p > 60
select p;

Correct Answers :

[B, D]

Explanation :

2. In order to perform a query, a data source must be implemented by:

A.
Enumerable or Queryable
B.
Enumerable and Queryable
C.
IEnumerable or IQueryable
D.
IEnumerable and IQueryable

Correct Answers :

[C]

Explanation :

3. You have developed an application which displays the list of students. You need to display 10 students at a time, and so on. Which code snippet would you use for this purpose?

A.
public static IEnumerable<int> Page(IEnumerable<int> source, int page, int pageSize)
{
return source.Skip((page - 1) * pageSize).Take(pageSize);
}
B.
public static IEnumerable<int> Page(IEnumerable<int> source, int page, int pageSize)
{
return source.Skip((page - 1) * page).Take(pageSize);
}
C.
public static IEnumerable<int> Page(IEnumerable<int> source, int page, int pageSize)
{
return source.Take((page - 1) * page).Skip(pageSize);
}
D.
public static IEnumerable<int> Page(IEnumerable<int> source, int page, int pageSize)
{
return source.Take((page - 1) * pageSize).Skip(pageSize);
}

Correct Answers :

[A]

Explanation :

4. An application includes an object that performs a long-running process. You need to ensure that the garbage collector does not release the object's resources until the process completes. Which garbage collector method should you use?

A.
WaitForFullGCComplete()
B.
WaitForFullGCApproach()
C.
KeepAlive() // ans
D.
WaitForPendingFinalizers()

Correct Answers :

[C]

Explanation :

5. Suppose you're writing an application that uses unmanaged resource. You've implemented an IDisposable interface to manage the memory of unmanaged resource. When implementing Dispose method, which method should you use to prevent garbage collector from calling the object's finalizer?

A.
GC.SuppressFinalize(this)//ans
B.
GC.SuppressFinalize(true)
C.
GC.WaitForFullGCApproach()
D.
GC.WaitForPendingFinalizers()

Correct Answers :

[A]

Explanation :

6. You're instantiating an unmanaged resource; which of the following statements would you use to instantiate an unmanaged resource so that its Dispose method shall always call automatically?

A.
if-else{}
B.
try/catch
C.
using()
D.
switch()

Correct Answers :

[C]

Explanation :

7.Suppose an application has a method name PrintAsterisk() that prints asterisks on a screen continuously. The method runs on a Task separate from the user interface. The application includes the following code. (Line numbers are included for reference only.)

01. static void PrintAsterisk(CancellationToken token)
02. {
03. while(!token.IsCancellationRequested)
04. {
05. Thread.Sleep(100);
06. Console.Write(" *");
07. }
08.
09. }
10. private static void Main()
11. {
12. var tokenSource = new CancellationTokenSource();
13. var task = Task.Run(() => PrintAsterisk(tokenSource.Token));
14. Console.WriteLine("Press [Enter] to stop printing Asterisk");
15. Console.ReadLine();
16.
17. task.Wait();
18. }

You need to ensure that the application stop printing the Asterisk on screen when the user presses the Enter key. Which code segment should you insert at line 16?

A.
tokenSource.Token.Register( () => tokenSource.Cancel() );
B.
tokenSource.Cancel(); Ans
C.
tokenSource.IsCancellationRequested = true;
D.
tokenSource.Dispose();

Correct Answers :

[B]

Explanation :

8. Suppose an application uses multiple asynchronous tasks to optimize performance. The application will be deployed in a distributed environment. You need to get the result of an asynchronous task from a web service. The data will later be parsed by a separate task. Which code segment should you use?

A.
protected async void StartTask()
{
string result = await GetData();
...
}
public Task<string> GetData()
{
...
}
B.
protected async void StartTask()
{
string result = await GetData();
...
}
public async Task<string> GetData()
{
...
}
C.
protected async void StartTask()
{
string result = GetData();
...
}
public Task<string> GetData()
{
...
}
D.
protected async void StartTask()
{
string result = async GetData();
...
}
public Task<string> GetData()
{
...
}

Correct Answers :

[B]

Explanation :

9. Identify a correct way to implement locking.

A.
//lockthis, is a private static variable of type object.
lock (lockthis)
{
...
}
B.
lock (new object())
{
...
}
C.
lock ()
{
...
}
D.
lock (this)
{
...
}

Correct Answers :

[A]

Explanation :

The first field after the preamble and Start Frame Delimiter (SFD) is the destination MAC address. The destination MAC address is always first because switches need to make forwarding decisions upon reading the destination MAC address.

10. An application uses multiple asynchronous tasks to optimize performance. You create three tasks by using the following code segment. (Line numbers are included for reference only.)

01. private void MultipleTasks()
02. {
03. Task[] tasks = new Task[]
04. {
05. Task.Run(()=>Thread.Sleep(2000)),
06. Task.Run(()=>Thread.Sleep(3000)),
07. Task.Run(()=>Thread.Sleep(1000)),
08. };
09.
10. ...
11. }

You need to ensure that the MultipleTasks () method waits until all three tasks complete before continuing. Which code segment should you insert at line 09?

A.
task.WaitFor(3);
B.
tasks.Yield();
C.
tasks.WaitForCompletion();
D.
Task.WaitAll(tasks);

Correct Answers :

[D]

Explanation :

11. Which of the following methods is used to run a LINQ query in parallel?

A.
AsParallel();
B.
RunParallel();
C.
ToParallel();
D.
Parallel();

Correct Answers :

[A]

Explanation :

12. You have to develop an application for an organization which reads the file and displays the content of a file. Which code snippet will properly fulfill your requirement?:

A.
string fileContent = "";
StreamReader reader = new StreamReader("data.txt");
fileContent = reader.ReadToEnd();
reader.Close();
B.
string fileContent = "";
StreamReader reader = null;
using (reader = new StreamReader("data.txt"))
{
fileContent = reader.ReadToEnd();
}
C.
string fileContent = "";
try
{
StreamReader reader = new StreamReader("data.txt");
fileContent = reader.ReadToEnd();
}
catch
{
}
D.
string fileContent = "";
StreamReader reader = new StreamReader("data.txt");
fileContent = reader.ReadToEnd();

Correct Answers :

[A, B]

Explanation :

13.You need to read a file from a web server and save the content of the file locally. Which code snippet will more preferable?:

A.
WebRequest request = WebRequest.Create(remoteFileUri);
WebResponse response = request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
StreamWriter writer = new StreamWriter("localFile.txt");
writer.Write(reader.ReadToEnd());
B.
WebRequest request = WebRequest.Create(remoteFileUri);
WebResponse response = request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
StreamWriter writer = new StreamWriter("localFile.txt");
writer.Write(reader.ReadToEnd());
writer.Close();
reader.Close();
response.Close();
C.
WebResponse response = null;
WebRequest request = WebRequest.Create("");
using (response = request.GetResponse())
{
StreamReader reader = new StreamReader(response.GetResponseStream());
StreamWriter writer = new StreamWriter("localFile.txt");
writer.Write(reader.ReadToEnd());
}
D.
WebResponse response = null;
StreamReader reader = null;
WebRequest request = WebRequest.Create("");
using (response = request.GetResponse())
reader = new StreamReader(response.GetResponseStream());
StreamWriter writer = new StreamWriter("localFile.txt");
writer.Write(reader.ReadToEnd());

Correct Answers :

[B]

Explanation :

14. You are working on an application that reads the file named “sample.txt”. Your application takes care of the following points when it reads the sample.txt file.

It does not make changes to the "sample" file.
It must allow other processes to access the "sample" file.
It must not throw an exception if the "sample" file does not exist.
Which code snippet should you choose to take care of said points about sample.txt?:

A.
var read = File.Open("sample.txt", FileMode.Open, FileAccess.Read, FileShare.Read);
B.
var read = File.Open("sample.txt", FileMode.OpenOrCreate, FileAccess.Read, FileShare. ReadWrite);
C.
var read = File.Open("sample.txt", FileMode.Open, FileAccess.ReadWrite, FileShare.Read);
D.
var read = File.Open("sample.txt", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);

Correct Answers :

[B]

Explanation :

15. You are developing an application that retrieves Person type data from the Internet using JSON. You have written the following function for receiving the data so far:
serializer.Deserialize<Person>(json);
Which code segment should you use before this function?

A.
DataContractJsonSerializer serializer = new DataContractJsonSerializer(typeof(Person));
B.
DataContractSerializer serializer = new DataContractSerializer(typeof(Person));
C.
JavaScriptSerializer serializer = new JavaScriptSerializer();
D.
NetDataContractSerializer serializer = new NetDataContractSerializer();

Correct Answers :

[C]

Explanation :

16. You need to store a large amount of data in a file. Which serializer would you consider better?

A.
XmlSerializer
B.
DataContractSerializer
C.
DataContractJsonSerializer
D.
BinaryFormatter
E.
JavaScriptSerializer

Correct Answers :

[D]

Explanation :

17. You want to serialize data in Binary format but some members don’t need to be serialized. Which attribute should you use?

A.
XmlIgnore
B.
NotSerialized
C.
NonSerialized
D.
Ignore

Correct Answers :

[C]

Explanation :

18. You want to retrieve data from Microsoft Access 2013, which should be read-only. Which class you should use?

A.
SqlDataAdapter
B.
DbDataAdapter
C.
OleDbDataReader
D.
SqlDataReader

Correct Answers :

[C]

Explanation :

19. Suppose you created the ASMX Web Service named SampleService. Which class you would use to create the proxy for this service?

A.
ampleServiceSoapClient
B.
SampleService
C.
SampleServiceClient
D.
SampleServiceSoapProxy

Correct Answers :

[A]

Explanation :

20. Choose the correct code snippet/snippets for insert query (insert code snippet of C#, syntax vise):

A.
SqlConnection con=new SqlConnection(“ConectionString”);
SqlCommand cmd=new SqlCommand(insertQuery,con);
Con.open();
Cmd.ExecuteNonQuery();
Con.close();
B.
Using(SqlConnection con=new SqlConnection(“ConectionString”))
{
SqlCommand cmd=new SqlCommand(insertQuery,con);
Cmd.ExecuteNonQuery();
}
C.
SqlConnection con=new SqlConnection(“ConectionString”);
Using( SqlCommand cmd=new SqlCommand(insertQuery,con))
{
Con.open();
Cmd.ExecuteNonQuery();
}
D.
Using(SqlConnection con=new SqlConnection(“ConectionString”))
{
SqlCommand cmd=new SqlCommand(insertQuery,con);
Con.Open();
Cmd.ExecuteNonQuery();
}

Correct Answers :

[A, D]

Explanation :

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