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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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No Time Limit
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1. Which of the following methods help us to convert string type data into integers? Select any two.

A.
Convert.toInt32();
B.
Convert.Int32();
C.
int.parse();
D.
parse.int();

Correct Answers :

[A, C]

Explanation :

2. Suppose you’re implementing a method name “Show” that will be able to take an unlimited number of int arguments. How are you going to define its method signature?

A.
void Show(int[] arg)
B.
void Show(params int[] arg)
C.
void Show(int a)
D.
void Show(ref int a)

Correct Answers :

[B]

Explanation :

3. You’re developing an application that saves user’s information. The application includes the following code segment (line numbers included for reference).
01 public bool IsNull(string name)
02 {
03 return true;
04 }
You need to evaluate whether a name is null. Which code segment should you insert at line 03

A.
if (name = null)
{
return true;
}
B.
if (name == null)
{
return true;
}
C.
if (null)
{
return true;
}
D.
if (!name)
{
return true;
}

Correct Answers :

[B]

Explanation :

4. You need to use null-coalescing operator to make sure “name” variable must have a value not null. Select the right way to use null-coalescing operator in C#.

A.
string name = n ?? “No Name”;
B.
string name = “No Name” ?? null;
C.
string name = “No Name” ? null;
D.
string name = null ? “No Name”;

Correct Answers :

[A]

Explanation :

5. Which jump statement will you use to start the next iteration while skipping the current iteration of loop?

A.
Break
B.
Continue
C.
Goto
D.
Return

Correct Answers :

[B]

Explanation :

6. Suppose you’re developing an application that saves age value in integers.
int age = 22;
You’re asked to select the right code snippet for defining the extension method for age.

A.
class Extension
{
public static void ExtensionMethod(int i)
{
//...
}
}
B.
static class Extension {
public static void ExtensionMethod(int i)
{
//...
}
}
C.
static class Extension
{
public static void ExtensionMethod(this int i)
{
//...
}
}
D.
static class Extension
{
public static void ExtensionMethod(int i)
{
//...
}
}

Correct Answers :

[C]

Explanation :

7. Which operator is used to compare types?

A.
as
B.
is
C.
this
D.
?

Correct Answers :

[B]

Explanation :

8. Choose the right code segment for defining implicit type conversion for a Person class.

A.
class Person
{
public string name;
public int age;
public static implicit operator this[int i]
{
this.age = i;
return this;
}
}
B.
class Person
{
public string name;
public int age;
public static implicit operator Person(string n)
{
Person person = new Person { age = 0, name = n };
return person;
}
}
C.
class Person
{
public string name;
public int age;
public static implicit Person(string n)
{
Person person = new Person { age = 0, name = n };
return person;
}
}
D.
class Person
{
public string name;
public int age;
public static implicit operator Person(this string n)
{
Person person = new Person { age = 0, name = n };
return person;
}
}

Correct Answers :

[B]

Explanation :

9. Which operator is used to get instance data inside type definition?

A.
as
B.
is
C.
this
D.
?

Correct Answers :

[C]

Explanation :

10. Which type cannot be instantiated?

A.
enum type
B.
static type
C.
class type
D.
System.Object type

Correct Answers :

[B]

Explanation :

11. Suppose you are developing an application that includes the following code segment:
interface ICricket

{
void Play();
}
interface IFootball
{
void Play();
}

You need to implement both Play() methods in a derived class named Player that uses the Play() method of each interface.
Which two code segments should you use?

A.
class Player : ICricket, IFootball
{
void ICricket.Play()
{
//TODO:
}
void IFootball.Play()
{
//TODO:
}
}
B.
Player player = new Player();
((ICricket)player).Play();
((IFootball)player).Play();
C.
Player player = new Player();
player.Play();
D.
Player player = new Player();
player.Play(ICricket);
player.Play(IFootball);
E.
class Player : ICricket, IFootball
{
public void ICricket.Play()
{
//TODO:
}
public void IFootball.Play()
{
//TODO:
}
}

Correct Answers :

[A, B]

Explanation :

12. Suppose you are developing an application. The application has two classes named Player and Person.
The Player class must meet the following requirements:
1. It must inherit from the Person class.
2. It must not be inheritable by other classes in the application.
Which code segment should you use?

A.
sealed class Player : Person
{
//TODO:
}
B.
abstract class Player : Person
{
//TODO:
}
C.
private class Player : Person
{
//TODO:
}
D.
partial class Player : Person
{
//TODO:
}

Correct Answers :

[A]

Explanation :

13.Suppose you’re creating a class named Player. The class exposes a string property named HitSpeed. Here is the code snippet of Player class.

01. class Player
02. {
03. public int HitSpeed
04. {
05. get;
06. set;
07. }
08. }

The HitSpeed property must meet the following requirements:
1. The value must be accessed by code within the Player class.
2. The value must be accessed to derived classes of Player.
3. The value must be modified only by code within the Player class.
You need to ensure that the implementation of the EmployeeType property meets the requirements.
Which code segment you should replace at line 05. And 06.?

A.
Replace line 05. with "public get;"
Replace Line 06. With "private set;"
B.
Replace line 05. with "protected get;"
Replace Line 06. With "private set;"
C.
Replace line 05. with "internal get;".
Replace Line 06. With "internal protected set;"
D.
Replace line 05. with "internal protected get;".
Replace Line 06. With "internal set;"

Correct Answers :

[B]

Explanation :

14. Is the following method “Display” considered to be overloaded?
class Person
{
public void Display()
{
//
}
public int Display()
{
//
}
}

A.
Yes
B.
No

Correct Answers :

[B]

Explanation :

15. How do you encapsulate an array of integers into an indexer? You must choose the right code segment.

A.
private int[] array;
public int this[int index]
{
get { return array[index]; }
set { array[index] = value; }
}
B.
private int[] array;
public int this(int index)
{
get { return array[index]; }
set { array[index] = value; }
}
C.
private int[] array;
public int[] this[int index]
{
get { return array; }
set { array[index] = value; }
}
D.
private int[] array; private int index;
public int this
{
get { return array[index]; }
set { array[index] = value; }
}

Correct Answers :

[A]

Explanation :

16. You are developing a game that allows players to collect from 0 through 1,000 coins. You are creating a method that will be used in the game. The method includes the following code. (Line numbers are included for reference only.)

01 public string FormatCoins(string name, int coins)
02 {
03
04 }

The method must meet the following requirements:
• Return a string that includes the player name and the number of coins.
• Display the number of coins without leading zeros if the number is 1 or greater.
• Display the number of coins as a single 0 if the number is 0.
You need to ensure that the method meets the requirements. Which code segment should you insert at line 03?

A.
return string.Format("Player {0}, collected {1} coins", name, coins.ToString("###0"));
B.
return string.Format("Player {0}, collected {1:000#} coins", name, coins.ToString());
C.
return string.Format("Player {name}, collected {coins.ToString('###0')} coins");
D.
return string.Format("Player {0}, collected {1:D3} coins", name, coins);

Correct Answers :

[D]

Explanation :

17. The following code is boxed into object o.
double d = 34.5;
object o = d;
You’re asked to cast "object o" into "int "".

A.
int i = (int)o;
B.
int i = (int)(double)o;
C.
int i = (int)(float)(double)o;
D.
int i = (float)o;

Correct Answers :

[C]

Explanation :

18. Suppose you’re developing an application which stores a user’s browser history. Which collection class will help to retrieve information of the last visited page?

A.
ArrayList
B.
Queue
C.
Stack
D.
HashTable

Correct Answers :

[C]

Explanation :

19. Suppose you’re writing a class that needs a delegate who can refer a method(s) of two input string parameters and return an integer value. Choose the right delegate from the following options.

A.
Action<int, string, string>
B.
Func<string, string, int>
C.
Predicate<int, string, string>
D.
EventArgs<int, string, string>

Correct Answers :

[B]

Explanation :

20. You are implementing a method that creates an instance of a class named Person. The Person class contains a public event named Die. The following code segment defines the Die event:
Public event EventHandler Die;
You need to create an event handler for the Die event by using a lambda expression.

A.
Person person = new Person();
person.Die = (s, e) => { /*Method Body*/};
B.
Person person = new Person();
person.Die -= (s, e) => { /*Method Body*/};
C.
Person person = new Person();
person.Die += (s, e) => { /*Method Body*/};
D.
Person person = new Person();
person.Die += () => { /*Method Body*/};

Correct Answers :

[C]

Explanation :

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