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C# - Test Drive...!!

Prashant Singh R 20 questions 5.0 (1 rating)

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1What must be different between two overloads of a method?
1. AEITHER the number of parameters OR the return type of each method overload
2. BThe names of the method overloads
3. CEITHER the number of parameters OR the type of at least one parameter
4. DEITHER the number of parameters OR the type of at least one parameter OR the return type of each method overload
5. EEITHER the names of the method overloads OR their return types
2Which operator would you use to attach a handler to an event?
1. A=
2. B=+
3. C+=
4. D=>
5. E->
3Which of the following is a syntactically correct way to declare and initialize an array of "int"?
1. Avar x = new int[]{1, 2, 3};
2. Bint[] x = int[] {1, 2, 3};
3. Cint[3] x = new int{1, 2, 3};
4. Dvar x = new {1, 2, 3};
4Consider this implementation of an enumerator.
If this is enumerated, at what point will the message "In finally block!" be written to the console?
1. AIt won't, the yield return bypasses the finally block.
2. BOnce, after the first item in the enumeration has been returned.
3. CThree times, once after returning each item in the enumeration.
4. DOnce, after the enumeration is complete.
5Name an advantage of passing a parameter to a method by reference, compared to passing by value
1. APassing by reference protects the data in the caller from inadvertant changes to the parameter value inside the called method.
2. BIf the method throws an exception, passing by reference preserves more information in the stack trace.
3. CIf the parameter is large, passing by reference saves data copying and can therefore be quicker.
4. DPassing by reference allows the method to safely execute on multiple threads simultaneously without risk of corrupting the data in the parameter.
6In the following code, [System.Web.Services.WebMethod] is an example of which C# language feature?
1. AFunctional Property
2. BWebMethod
3. CAttribute
4. DMethod-Setting
7What is the main problem with the following code?
1. AThe variable "ex" has been declared twice in the same context.
2. BThe variable "ex" is not used in the last catch block.
3. COnly one "catch" block can be associated with each "try" block.
4. DThe last "catch" block is unreachable.
8Write the following LINQ query using method syntax.
1. Avar shortNames = names.Where(name => name.Length < 4)
  .OrderBy(name => name);
2. Bvar shortNames = names.Where(name.Length < 4)
  .OrderBy(x);
3. Cvar shortNames = names.Where(this.Length < 4)
  .OrderBy(this);
4. Dvar shortNames = names.Where(this.Length < 4)
  .OrderBy(this)
  .Select(this);
9What is the full name of the "type" that is represented by keyword "long"?
1. ASystem.Int64
2. BSystem.Long64
3. CSystem.Int
4. DSystem.Int32
5. ESystem.Long
10What does the "params" keyword do when used in a method parameter list?
1. AGuides the compiler in which overload of a method to choose
2. BAllows arguments of any type to be passed to a method
3. CAllows individual arguments to be omitted, with default values supplied, when calling the method
4. DAllows a variable number of arguments to be used when a method is called

11What happens when the below code is executed?

public interface ICar
{ public int getspeed(); }
1. ASucceed
2. BCompile error
3. CWarning
12class Car
{
public void DescribeCar()
{
ShowDetails();
}
public virtual void ShowDetails()
{
System.Console.WriteLine("Standard transportation.");
}
}

class ConvertibleCar : Car
{
public new void ShowDetails()
{
System.Console.WriteLine("A roof that opens up.");
}
}

class Minivan : Car
{
public override void ShowDetails()
{
System.Console.WriteLine("Carries seven people.");
}
}

public static void TestCars1()
{

Car car1 = new Car();
car1.DescribeCar();
ConvertibleCar car2 = new ConvertibleCar();
car2.DescribeCar();
Minivan car3 = new Minivan();
car3.DescribeCar();
}
1. AStandard transportation
  Standard transportation
  Standard transportation
2. BStandard transportation
  A roof that opens up.
  Carries seven people.
3. CStandard transportation
  Standard transportation
  Carries seven people.
13On the whole, which types can you inherit from ?
1. AAny struct or class that is not marked as sealed
2. BAny class that is not marked as sealed
3. CAny class
4. DAny type except for the C# built-in types (int, bool, string, etc.)
14Which of these shows the correct way to declare an extension method on "string" called "WordCount()" ?
1. Apublic static int WordCount (string str) : this str
  { /* ... */ }
2. Bpublic static extension int WordCount (string, string str)
  { /* ... */ }
3. Cpublic extension int string.WordCount(this string str)
  { /* ... */ }
4. Dpublic static int WordCount (this string str)
  { /* ... */ }
15What is the visibility of the "CurrentSpeed" property in the following code ?
public class Automobile
{ double CurrentSpeed {get; set;} }
1. AProtected internal
2. BProtected
3. CInternal
4. DPublic
5. EPrivate
16Consider the following code.
Which of the following is true about the inner "userResponse" declaration?
1. AIt will cause a compiler error because the name conflicts with the first userResponse declaration
2. BIt will not allocate a new variable, but will instead overwrite the contents of the outer userResponse variable.
3. CIt will cause a compiler error because you cannot declare local variables inside a foreach loop.
4. DIt will cause the outer userResponse variable to be hidden within the foreach loop.
17What does this code illustrate?
1. AA generic collection
2. BA generic method
3. CA generic constraint
4. DA generic type
18How can you "modify" the "Manager" constructor declaration so that it passes its parameter to the "Employee" constructor
1. Apublic Manager(string name) : base(name)
  {
  base.ctor(name)
  /* ... */
  }
2. Bpublic Manager(string name) : Employee(name)
  { /* ... */}
3. Cpublic Manager(string name) : base(name)
  { /* ... */}
4. Dpublic Manager(string name)
  {
  Employee(name)
  /* ... */
  }
19What will be the execution result of the following code ?
1. A"Hello World!" is displayed in the text block on button click
2. B"Hello World!" is displayed in the text block on button click, after 1 second.
3. C"Hello World!" is never displayed in the text block
4. D"Hello World!" is displayed in the text block on button click, after 10 seconds
20What will be the execution result of this code (in the console) ?
1. APrints values from 1 to 10
2. BPrints "10" - ten times
3. CThrows a compiler error - as del() is not a method
4. DPrints "1" - ten times
5. EThrows a compiler error - as C# "List" cannot have methods in it

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Description: A small test drive - to evaluate a few important concepts from C#
Author: Prashant Singh R
Language: English
Views: 251
Tags: c#evaluationoopsengineeringpmp
Rating: 5.0 out of 5 · 1 rating
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C# - Test Drive...!!

Questions in this quiz (20)

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