C# Developer Test
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This is a C# test. The test contains 40 questions and you have 30 minutes to solve them.
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- 1.
A local variable ...
- A.
Can be used anywhere in the program
- B.
Is declared within a method
- C.
Must accept a class
- D.
Represent a class object
Correct Answer
B. Is declared within a method -
- 2.
An instance variable ...
- A.
Is an object of a class
- B.
Represents an attribute of an object
- C.
Is a method of a class
- D.
A and c
Correct Answer
B. Represents an attribute of an object -
- 3.
Private Button print = new Button();
- A.
Creates a button control
- B.
Initializes a button control
- C.
Instantiates button control
- D.
A and b
- E.
A and c
Correct Answer
E. A and c -
- 4.
An instance method ...
- A.
Represents the behavior of an object
- B.
Represents the attribute of an object
- C.
Represents another class
- D.
A and b
Correct Answer
A. Represents the behavior of an object -
- 5.
A Constructor ...
- A.
Is used to create objects
- B.
Must have the same name as the class it is declared within
- C.
Maybe overloaded
- D.
B and c
- E.
All of the above
Correct Answer
E. All of the above -
- 6.
Class Test: Form { }
- A.
Creates the class Test : Form
- B.
Creates the class Test that inherits the class Form
- C.
Creates the class form that inherits the class Test
- D.
A and b
Correct Answer
B. Creates the class Test that inherits the class Form -
- 7.
A variable declared inside a method is called a________variable
- A.
Static
- B.
Private
- C.
Local
- D.
Serial
- E.
B and d
Correct Answer
C. Local -
- 8.
Defining two methods with the same name but with different parameters is called.
- A.
Loading
- B.
Overloading
- C.
Multiplexing
- D.
Duplexing
Correct Answer
B. Overloading -
- 9.
Find any errors in the following BankAccount constructor: Public int BankAccount() { balance = 0; }
- A.
Name
- B.
Formal parameters
- C.
Return type
- D.
No errors
Correct Answer
C. Return type -
- 10.
In the body of a method, C# uses the variable named_____to refer to the current object whose method is being invoked.
- A.
Call
- B.
This
- C.
Do
- D.
That
Correct Answer
B. This -
- 11.
String mystring; Creates a(n)
- A.
Class
- B.
Constructor
- C.
Object
- D.
A and b
Correct Answer
C. Object -
- 12.
An Event is ...
- A.
The result of a users action
- B.
Result of a party
- C.
Code to force users action
Correct Answer
A. The result of a users action -
- 13.
A delegate defines ...
- A.
A Wahsington representative
- B.
A class that encapsulates methods
- C.
A means of passing arrays into methods
- D.
A substitue for an inherited method
Correct Answer
B. A class that encapsulates methods -
- 14.
Is it possible to pass methods as arguments for other methods without modification.
- A.
True
- B.
False
Correct Answer
A. True -
- 15.
All interfaces must contain IDrivable.
- A.
All interfaces must contain IDrivable
- B.
True
- C.
False
Correct Answer
C. False -
- 16.
What is the proper header for a class that intends to use an interface?
- A.
Class MyClass IFace
- B.
Class MyClass ; IFace
- C.
Class MyClass : IFace
- D.
Class MyCalss {IFace}
- E.
Class MyCalss(IFace)
Correct Answer
C. Class MyClass : IFace -
- 17.
In order for a class to use an interface, it must ...
- A.
Inherit the properties of the interface
- B.
Contain the same methods as the interface
- C.
Create an interface objects
- D.
A and b
- E.
All of the above
Correct Answer
E. All of the above -
- 18.
Every class directly or indirectly extends the______class.
- A.
System
- B.
Object
- C.
Drawing
- D.
Console
Correct Answer
B. Object -
- 19.
Polymorphism occurs when the methods of the child class.
- A.
Override the parent class methods but maintain the implementation
- B.
Maintain the same return type and arguments as the parent class, but implement it differently
- C.
Have different return types and arguments than the parent class
- D.
Are Virtual
Correct Answer
B. Maintain the same return type and arguments as the parent class, but implement it differently -
- 20.
To output the value of multidimensional array, Console.WriteLines(___)
- A.
MyArray[1][3];
- B.
MyArray[1.3];
- C.
MyArray{1}{3};
- D.
MyArray(1),(3);
Correct Answer
A. MyArray[1][3]; -
- 21.
All methods in an abstract base class must be declared abstract.
- A.
True
- B.
False
Correct Answer
B. False -
- 22.
Methods that are declared abstract in the base class must show implementation at the time of declaration.
- A.
True
- B.
False
Correct Answer
B. False -
- 23.
The code public class B : A { }
- A.
Defines a class that inherits all the methods of A
- B.
Defines a class that inherits the public and protected methods of A only
- C.
Errors
- D.
A and b
Correct Answer
B. Defines a class that inherits the public and protected methods of A only -
- 24.
Assuming that public class B : A { public B(int i) :base(i) { } } compiles and runs correctly, what can we conclude about the constructors in the class A?
- A.
One constructor takes an argument of type i
- B.
There is only a default constructor
- C.
One constructor takes an arguments of the type int
- D.
A and b
Correct Answer
C. One constructor takes an arguments of the type int -
- 25.
Classes declared with the sealed keyword cannot be base class.
- A.
True
- B.
False
Correct Answer
A. True -
- 26.
A method_............_an exception when that method detects that a problem has occured.
- A.
Trys
- B.
Catches
- C.
Throws
- D.
A and b
Correct Answer
C. Throws -
- 27.
An abstract class ...
- A.
May contain instance variables
- B.
May contain constructors
- C.
May extend another class
- D.
A and b
- E.
All of the above
Correct Answer
E. All of the above -
- 28.
A ____ block enclose the code that could throw an exception.
- A.
Try
- B.
Catch
- C.
Exception
- D.
Error
- E.
A and b
Correct Answer
A. Try -
- 29.
A Thread is:
- A.
An object that allows computer multitasking
- B.
An object that wraps itself with other threads
- C.
A deprecated object that is no longer used
Correct Answer
A. An object that allows computer multitasking -
- 30.
In C# Thread.Sleep(time) measures time in:
- A.
Seconds
- B.
Milliseconds
- C.
Nanoseconds
- D.
All of the above
Correct Answer
B. Milliseconds -
- 31.
When a thread returns from a WaitSleepJoin or Suspended state it returns to the:
- A.
Unstarted state
- B.
Stopped state
- C.
Started state
- D.
Resume state
Correct Answer
C. Started state -
- 32.
The way of returning a thread from s suspended state is:
- A.
Pulse
- B.
PulseAll
- C.
PulseAll
- D.
Resume
- E.
ReStart
Correct Answer
D. Resume -
- 33.
In order to lock/unlock an object use the:
- A.
Lock and Unlock methods
- B.
Enter and Exit methods
- C.
Close and Open methods
- D.
Close and Allow methods
Correct Answer
B. Enter and Exit methods -
- 34.
Class String and the Char structure found in the:
- A.
System.Strings namespace
- B.
System.Text namespace
- C.
System.Chars namespace
- D.
System namespace
Correct Answer
D. System namespace -
- 35.
A String literal is a:
- A.
Only contains one character
- B.
Contains numbers rather than letters
- C.
Sequence of characters in double quotation marks
- D.
Contains exactly its variable name and nothing else
Correct Answer
C. Sequence of characters in double quotation marks -
- 36.
To create a string literal exclude escape sequence, use:
- A.
!string
- B.
@string
- C.
#string
- D.
$string
Correct Answer
B. @string -
- 37.
String indexers treat strings as:
- A.
Binary code
- B.
1 to string Length
- C.
Arrays of characters
- D.
A character
Correct Answer
C. Arrays of characters -
- 38.
If an IndexofAny method is passed an array of characters it:
- A.
Finds the first occurrence of each letter in the string
- B.
Searches for the first occurrence of any of the characters in the string
- C.
Will search for the first occurrence of the sequence of characters
- D.
Generates an error
Correct Answer
B. Searches for the first occurrence of any of the characters in the string -
- 39.
If two StringBuilder objects contain the same string then
- A.
They represent the same meory location
- B.
The are two different objects
- C.
If one changes, so will the other
- D.
None of the above
Correct Answer
B. The are two different objects -
- 40.
The proper way to convert a string to all lowercase is:
- A.
String = string.ToLower(string);
- B.
ToLower(string);
- C.
String.ToLower();
- D.
String.ToLower(string);
Correct Answer
C. String.ToLower(); -
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Current Version
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Feb 19, 2013Quiz Edited by
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Jul 03, 2012Quiz Created by
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