Virtual 70-483 Exam Questions 2021

NEW QUESTION 1
You are creating a class named Employee. The class exposes a string property named EmployeeType. The following code segment defines the Employee class. (Line numbers are included for reference only.)

The EmployeeType property value must be accessed and modified only by code within the Employee class or within a class derived from the Employee class.
You need to ensure that the implementation of the EmployeeType property meets the requirements. Which two actions should you perform? (Each correct answer represents part of the complete solution. Choose two.)

• A. Replace line 05 with the following code segment: protected get;
• B. Replace line 06 with the following code segment: private set;
• C. Replace line 03 with the following code segment: public string EmployeeType
• D. Replace line 05 with the following code segment: private get;
• E. Replace line 03 with the following code segment: protected string EmployeeType
• F. Replace line 06 with the following code segment: protected set;

Answer: BE

Explanation: protected string EmpType { get; private set;}
This is a quite common way to work with properties within base classes. Incorrect:
Not D: Cannot be used because of the internal keyword on line 03.

NEW QUESTION 2
You are creating an application that manages information about zoo animals. The application includes a class named Animal and a method named Save.
The Save() method must be strongly typed. It must allow only types inherited from the Animal class that uses a constructor that accepts no parameters.
You need to implement the Save() method. Which code segment should you use?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: C

Explanation: The condition new() ensures the empty/default constructor and must be the last condition.
When you define a generic class, you can apply restrictions to the kinds of types that client code can use for type arguments when it instantiates your class. If client code tries to instantiate your class by
using a type that is not allowed by a constraint, the result is a compile-time error. These restrictions are called constraints. Constraints are specified by using the where contextual keyword. http://msdn.microsoft.com/en-us/library/d5x73970.aspx

NEW QUESTION 3
You are testing an application. The application includes methods named CalculateInterest and LogLine. The CalculateInterest() method calculates loan interest. The LogLine() method sends diagnostic messages to a console window.
The following code implements the methods. (Line numbers are included for reference only.)

You have the following requirements:
The CalculateInterest() method must run for all build configurations. The LogLine() method must run only for debug builds.
You need to ensure that the methods run correctly.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

• A. Insert the following code segment at line 01:#region DEBUGInsert the following code segment at line 10:#endregion
• B. Insert the following code segment at line 01: [Conditional("DEBUG")]
• C. Insert the following code segment at line 05:#region DEBUGInsert the following code segment at line 07:#endregion
• D. Insert the following code segment at line 10: [Conditional("DEBUG")]
• E. Insert the following code segment at line 01:#if DEBUGInsert the following code segment at line 10:#endif
• F. Insert the following code segment at line 10: [Conditional("RELEASE")]
• G. Insert the following code segment at line 05:#if DEBUGInsert the following code segment at line 07:#endif

Answer: DG

Explanation: D: Also, it's worth pointing out that you can use [Conditional("DEBUG")] attribute on methods that return void to have them only executed if a certain symbol is defined. The compiler would remove all calls to those methods if the symbol is not defined:
[Conditional("DEBUG")] void PrintLog() {
Console.WriteLine("Debug info");
}
void Test() { PrintLog();
}
G: When the C# compiler encounters an #if directive, followed eventually by an #endif directive, it will compile the code between the directives only if the specified symbol is defined. Unlike C and C++, you cannot assign a numeric value to a symbol; the #if statement in C# is Boolean and only tests whether the symbol has been defined or not. For example,
#define DEBUG
#if DEBUG
Console.WriteLine("Debug version");
#endif
Reference: http://stackoverflow.com/questions/2104099/c-sharp-if-then-directives-for-debug-vsrelease

NEW QUESTION 4
DRAG DROP
You are implementing a method that creates an instance of a class named User. The User class contains a public event named Renamed. The following code segment defines the Renamed event: Public event EventHandler<RenameEventArgs> Renamed;
You need to create an event handler for the Renamed event by using a lambda expression.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Answer:

Explanation:

NEW QUESTION 5
You are developing an application that will use multiple asynchronous tasks to optimize performance.
You create three tasks by using the following code segment. (Line numbers are included for reference only.)

You need to ensure that the ProcessTasks() 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);

Answer: D

Explanation: The Task.WaitAll method (Task[]) waits for all of the provided Task objects to complete execution. Example:
// Construct started tasks
Task<int>[] tasks = new Task<int>[n]; for (int i = 0; i < n; i++)
{
tasks[i] = Task<int>.Factory.StartNew(action, i);
}
// Exceptions thrown by tasks will be propagated to the main thread
// while it waits for the tasks. The actual exceptions will be wrapped in AggregateException. try
{
// Wait for all the tasks to finish. Task.WaitAll(tasks);
// We should never get to this point
Console.WriteLine("WaitAll() has not thrown exceptions. THIS WAS NOT EXPECTED.");
}
Reference: Task.WaitAll Method (Task[]) https://msdn.microsoft.com/en-us/library/dd270695(v=vs.110).aspx

NEW QUESTION 6
You are evaluating a method that calculates loan interest. The application includes the following code segment. (Line numbers are included for reference only.)

When the loanTerm value is 5 and the loanAmount value is 4500, the loanRate must be set to 6.5 percent.
You need to adjust the loanRate value to meet the requirements. What should you do?

• A. Replace line 15 with the following code segment: loanRate = 0.065m;
• B. Replace line 07 with the following code segment: loanRate = 0.065m;
• C. Replace line 17 with the following code segment: interestAmount = loanAmount * 0.065m * loanTerm;
• D. Replace line 04 with the following code segment: decimal loanRate = 0.065m;

Answer: A

Explanation: Line 15 will be executed when the loanTerm value is 5.

NEW QUESTION 7
HOTSPOT
You have the following code:

For each of the following statements, select Yes if the statement is true. Otherwise, select No.

Answer:

Explanation: Explanation for second Answer
Events are multicast delegates and that one has a linked list to store the delegates in. The order of execution is always the same as they are inserted.

NEW QUESTION 8
DRAG DROP
You are developing an application by using C#. The application includes an array of decimal values named loanAmounts. You are developing a LINQ query to return the values from the array.
The query must return decimal values that are evenly divisible by two. The values must be sorted from the lowest value to the highest value.
You need to ensure that the query correctly returns the decimal values.
How should you complete the relevant code? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Answer:

Explanation: Note: In a query expression, the orderby clause causes the returned sequence or subsequence (group) to be sorted in either ascending or descending order.
Examples:
// Query for ascending sort. IEnumerable<string> sortAscendingQuery = from fruit in fruits
orderby fruit //"ascending" is default select fruit;
// Query for descending sort. IEnumerable<string> sortDescendingQuery = from w in fruits
orderby w descending select w;

NEW QUESTION 9
You are developing a class named Account that will be used by several applications.
The applications that will consume the Account class will make asynchronous calls to the Account class to execute several different methods.
You need to ensure that only one call to the methods is executed at a time. Which keyword should you use?

• A. sealed
• B. protected
• C. checked
• D. lock

Answer: D

Explanation: The lock keyword ensures that one thread does not enter a critical section of code while another thread is in the critical section. If another thread tries to enter a locked code, it will wait, block, until the object is released.
Reference: lock Statement (C# Reference) https://msdn.microsoft.com/en-us/library/c5kehkcz.aspx

NEW QUESTION 10
You are modifying an existing banking application.
The application includes an Account class and a Customer class. The following code segment defines the classes.

You populate a collection named customerCollection with Customer and Account objects by using the following code segment:

You create a largeCustomerAccounts collection to store the Account objects by using the following code segment:
Collection<Account> largeCustomerAccounts = new Collection<Account> ();
All accounts with a Balance value greater than or equal to 1,000,000 must be tracked. You need to populate the largeCustomerAccounts collection with Account objects. Which code segment should you use?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: C

NEW QUESTION 11
DRAG DROP
You are developing a C# console application that outputs information to the screen. The following code segments implement the two classes responsible for making calls to the Console object:

When the application is run, the console output must be the following text: Log started
Base: Log continuing Finished
You need to ensure that the application outputs the correct text.
Which four lines of code should you use in sequence? (To answer, move the appropriate classes from the list of classes to the answer area and arrange them in the correct order.)

Answer:

Explanation: Incorrect:
Not Box 4: logger.LogCompleted();
The output would incorrectly be “Completed”

NEW QUESTION 12
DRAG DROP
You have the following class. (Line numbers are included for reference only.)

You need to complete the doOperation method to meet the following requirements:
If AddNumb is passed as the operationName parameter, the AddNumb function is called. If SubNumb is passed as the operationName parameter, the SubNumb function is called.
Which code should you insert at line 16? Develop the solution by selecting and arranging the required code blocks in the correct order. You may not need all of the code blocks.

Answer:

Explanation: Note:
* target 2:
GetType() is a method you call on individual objects, to get the execution-time type of the object. Incorrect: typeof is an operator to obtain a type known at compile-time (or at least a generic type parameter). The operand of typeof is always the name of a type or type parameter - never an expression with a value (e.g. a variable). See the C# language specification for more details. Reference: What is the difference of getting Type by using GetType() and typeof()? http://stackoverflow.com/questions/11312111/when-and-where-to-use-gettype-or-typeof

NEW QUESTION 13
You are developing an application that uses multiple asynchronous tasks to optimize performance. The application will be deployed in a distributed environment.
You need to retrieve the result of an asynchronous task that retrieves data from a web service. The data will later be parsed by a separate task.
Which code segment should you use?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: B

Explanation: Example:
// Signature specifies Task<TResult>
async Task<int> TaskOfTResult_MethodAsync()
{
int hours;
// . . .
// Return statement specifies an integer result. return hours;
}
// Calls to TaskOfTResult_MethodAsync
Task<int> returnedTaskTResult = TaskOfTResult_MethodAsync(); int intResult = await returnedTaskTResult;
// or, in a single statement
int intResult = await TaskOfTResult_MethodAsync();
// Signature specifies Task
async Task Task_MethodAsync()
{
// . . .
// The method has no return statement.
}
// Calls to Task_MethodAsync
Task returnedTask = Task_MethodAsync(); await returnedTask;
// or, in a single statement await Task_MethodAsync();
Reference: Asynchronous Programming with Async and Await (C# and Visual Basic) https://msdn.microsoft.com/en-us/library/hh191443.aspx

NEW QUESTION 14
You are testing an application. The application includes methods named CalculateInterest and LogLine. The CalculateInterest() method calculates loan interest. The LogLine() method sends diagnostic messages to a console window.
The following code implements the methods. (Line numbers are included for reference only.)

You have the following requirements:
The Calculatelnterest() method must run for all build configurations. The LogLine() method must run only for debug builds.
You need to ensure that the methods run correctly.
What are two possible ways to achieve this goal? (Each correct answer presents a complete solution. Choose two.)

• A. Insert the following code segment at line 01:#region DEBUGInsert the following code segment at line 10:#endregion
• B. Insert the following code segment at line 10: [Conditional("DEBUG")]
• C. Insert the following code segment at line 05:#region DEBUGInsert the following code segment at line 07:#endregion
• D. Insert the following code segment at line 01:#if DE30GInsert the following code segment at line 10:#endif
• E. Insert the following code segment at line 01: [Conditional(MDEBUG")]
• F. Insert the following code segment at line 05:#if DEBUGInsert the following code segment at line 07:#endif
• G. Insert the following code segment at line 10: [Conditional("RELEASE")]

Answer: BF

Explanation: #if DEBUG: The code in here won't even reach the IL on release.
[Conditional("DEBUG")]: This code will reach the IL, however the calls to the method will not execute unless DEBUG is on.
http://stackoverflow.com/questions/3788605/if-debug-vs-conditionaldebug

NEW QUESTION 15
You plan to store passwords in a Windows Azure SQL Database database.
You need to ensure that the passwords are stored in the database by using a hash algorithm, Which cryptographic algorithm should you use?

• A. ECDSA
• B. RSA-768
• C. AES-256
• D. SHA-256

Answer: D

Explanation: Secure Hash Algorithm is a cryptographic hash function. Incorrect:
Not B: EDCA is an encryption algorithm. Not B: RSA is an encryption algorithm. Not C: AES is an encryption algorithm.
Reference: https://en.wikipedia.org/wiki/SHA-1

NEW QUESTION 16
DRAG DROP
You have a method that will evaluate a parameter of type Int32 named Status. You need to ensure that the method meets the following requirements:
If Status is set to Active, the method must return 1. If Status is set to Inactive, the method must return 0.
If Status is any other value, the method must return -1.
What should you do? (To answer, drag the appropriate statement to the correct location in the answer area. Each statement may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Answer:

Explanation: Example:
int caseSwitch = 1; switch (caseSwitch)
{
case 1:
Console.WriteLine("Case 1"); break;
case 2:
Console.WriteLine("Case 2"); break;
default: Console.WriteLine("Default case"); break;
}
Reference: switch (C# Reference) https://msdn.microsoft.com/en-us/library/06tc147t.aspx

NEW QUESTION 17
HOTSPOT
You have the following code.

For each of the following statements, select Yes if the statement is true. Otherwise, select No.

Answer:

Explanation: References: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/classes-andstructs/ inheritance

NEW QUESTION 18
DRAG DROP
You are developing a class named Temperature.
You need to ensure that collections of Temperature objects are sortable.
How should you complete the relevant code segment? (To answer, drag the appropriate code segments to the correct locations in the answer area. Each code segment may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.)

Answer:

Explanation: