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C# .NET Quiz

There are 45 questions in this quiz. Good luck!
Passing grade is 70% = C.
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


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


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


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


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


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


7) A variable declared inside a method is called a________variable
       a) Static
       b) Private
       c) Local
       d) Serial
       e) b and d


8) Defining two methods with the same name but with different parameters is called.
       a) Loading
       b) Overloading
       c) Multiplexing
       d) Duplexing


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


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


11) String mystring; Creates a(n)
       a) Class
       b) Constructor
       c) Object
       d) a and b


12) An Event is
       a) The result of a users action
       b) result of a party
       c) code to force 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


14) Is it possible to pass methods as arguments for other methods without modification.
       a) True
       b) False


15) All interfaces must contain IDrivable
       a) True
       b) 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)


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


18) Every class directly or indirectly extends the______class.
       a) System
       b) Object
       c) Drawing
       d) Console


19) The concept of composition specifies that you can.
       a) Compose good code with C#
       b) Compose C# projects with different objects
       d) Reduce errors by remaining composed during programming
       e) all of the above


20) 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


21) 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);


22) All methods in an abstract base class must be declared abstract.
       a) True
       b) False


23) Methods that are declared abstract in the base class must show implementation at the time of declaration.
       a) True
       b) False


24) 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


25) 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


26) Classes declared with the sealed keyword cannot be base class.
       a) True
       b) False


27) A method_____an exception when that method detects that a problem has occured.
       a) Trys
       b) Catches
       c) Throws
       d) a and b


28) Exception objects are derived from the class.
       a) Try
       b) Catch
       c) Exception
       d) Event
       e) System


29) 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


30) A____block enclose the code that could throw an exception.
       a) Try
       b) Catch
       c) Exception
       d) Error
       e) a and b


31) 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


32) Synchronization is:
       a) the delaying of a thread until there is sufficient memory and work to keep it up
       b) making every thread start and end at the same time
       c) make each thread do the same thing
       d) have each thread start at the same time but not necessarily finish together
       e) wait until the required resources, that are used by other threads become available


33) In C# Thread.Sleep(time) measures time in:
       a) seconds
       b) milliseconds
       c) nanoseconds
       d) all of the above


34) When a thread returns from a WaitSleepJoin or Suspended state it returns to the:
       a) Unstarted state
       b) Stopped state
       c) Started state (now considering a part of the running state)
       d) Resume state


35) The ThreadPriority enumeration does not contain:
       a) Lowest
       b) Highest
       c) BelowNormal
       d) None of the above


36) The way of returning a thread from s suspended state is:
       a) Pulse
       b) PulseAll
       c) Interrupt
       d) Resume
       e) ReStart


37) 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


38) Class String and the Char structure found in the:
       a) System.Strings namespace
       b) System.Text namespace
       c) System.Chars namespace
       d) System namespace


39) 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


40) To create a string literal exclude escape sequence, use:
       a) !string
       b) @string
       c) #string
       d) $string


41) String indexers treat strings as:
       a) binary code
       b) 1 to string Length
       c) arrays of characters
       d) a character


42) 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


43) Concatenating with strings are done with:
       a) reserved words
       b) method calls
       c) operator overloading
       d) operator overloading and method calls


44) 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


45) 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);






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