Question 1

The class is the portion of the class that is visible to the application programmer.
A) form
B) design
C) control
D) interface

Accepted Answer

The class represents the interface that is visible to the application programmer, therefore the correct answer is interface (option D). The other options (form, design, control) refer to specific aspects of graphical user interfaces and are not directly related to programming classes.

Question 2

Which of the following statements will remove an object referred to by the object variable NewStudent?
A) NewStudent = String.Empty
B) NewStudent = Nothing
C) NewStudent.Delete
D) Remove.NewStudent

Accepted Answer

Setting an object variable to Nothing removes the reference to the object, thereby making it available for garbage collection. The other choices are not valid syntax for removing an object.

Question 3

Which of the following operators determines if two object variables reference the same object?
A) =
B) IsEqual
C) Is
D) SameAs

Accepted Answer

The "Is" operator determines if two object variables reference the same object. The "=" operator is for assignment and the "IsEqual" and "SameAs" operators do not exist in Python.

Question 4

A constructor is a method named _found inside the class.
A) New
B) Constructor
C) Finalizer
D) the same as the class name

Accepted Answer

The answer of A constructor is a method named _found...

Question 5

The _property is used to get the number of items in a collection.
A) accumulator
B) enumerator
C) index
D) count

Accepted Answer

The count property is specifically used to get the number of items in a collection. The accumulator is used to accumulate values while iterating through a collection. The enumerator is used to iterate through a collection one item at a time. The index is used to access a specific item in a collection.

Question 6

You access public members of a class object with _.
A) the getData method
B) the access operator
C) the dot operator
D) a public module

Accepted Answer

In Python, the dot operator (.) is used to access the public members of a class object.

Question 7

Which method is used to create a new item in a collection?
A) Store
B) Insert
C) Add
D) Create

Accepted Answer

The "Add" method is commonly used to create a new item in a collection, such as adding an element to a list or a set in various programming languages.

Question 8

An instance of a class is also called ____.
A) a tangible entity
B) an object
C) a method
D) a property

Accepted Answer

An instance of a class is commonly referred to as an object. This is because when a class is instantiated or created, it becomes an object with its own set of properties and methods. Choices A, C, and D are incorrect because a tangible entity refers to something physical, a method is a function that performs actions, and a property is a value stored within an object.

Question 9

Which of the following displays a message box saying "I have been created" every time a new instance of the class ShowMe is created?
A) Public Class ShowMe MessageBox.Show"I have been created")
End Class
B) Public Class ShowMe Public Sub Constructor)
MessageBox.Show"I have been created")
End Sub
End Class
C) Public Class ShowMe Public Sub Create)
MessageBox.Show"I have been created")
End Sub
End Class
D) Public Class ShowMe Public Sub New)
MessageBox.Show"I have been created")
End Sub
End Class

Accepted Answer

The correct syntax for a class constructor, which is called when a new instance of the class is created, is to use the keyword "New". Therefore, the correct code to display a message box saying "I have been created" every time a new instance of the ShowMe class is created is:

Public Class ShowMe 
   Public Sub New() 
      MessageBox.Show("I have been created") 
   End Sub 
End Class

Question 10

A variable declared inside a class is also known as a .
A) member variable
B) static variable
C) hidden variable
D) global variable

Accepted Answer

A variable declared inside a class is commonly referred to as a member variable as it belongs to and is accessed within the scope of the class. Static variables are declared with the static keyword and have a different scope and behavior. Hidden variables and global variables are not accurate terms to describe a variable declared inside a class.

Question 11

Which of the following displays a window that lets you browse the classes available to your project?
A) Component Browser
B) Class Browser
C) Object Browser
D) Module Browser

Accepted Answer

The Object Browser in development environments like Visual Studio allows you to browse, search, and inspect the classes, methods, properties, and other components available in your project or referenced libraries.

Question 12

Object-oriented programming is a way of designing and coding applications such that interchangeable software can be used to build larger programs.
A) controls
B) structures
C) components
D) languages

Accepted Answer

Object-oriented programming involves creating software components that can be reused and combined to form larger programs. These components are designed with specific functionalities and can be easily integrated with other components to create the desired application. These components are known as objects or software components.

Question 13

The hiding of data and procedures inside a class is achieved through a process called ___.
A) data enclosing
B) encapsulation
C) modularization
D) components

Accepted Answer

Encapsulation is the process of hiding the internal details of an object and protecting its state from outside interference. This is achieved by placing data and procedures inside a class, which ensures that only the methods within the class can directly access and modify the data. This helps in creating more secure and robust code. The other options are not related to the concept of encapsulation.

Question 14

Client programs can query _to get values, but they cannot modify them.
A) Read-Only properties
B) Get/Set properties
C) Private methods
D) Public properties

Accepted Answer

Read-Only properties allow the client programs to query and retrieve values, but they cannot change them. Therefore, it fits the given statement perfectly as the client can only read the values but not modify them. Get/Set properties, on the other hand, allow both reading and modifying the values. Private methods are not publicly accessible and cannot be used by client programs. Public properties can be both read and modified by client programs.

Question 15

All of the following statements are true about the .NET garbage collection utility except .
A) The garbage collector is a utility program that removes objects from memory that are no longer needed.
B) As the amount of available memory decreases, the garbage collector removes unreferenced objects more often.
C) The garbage collector removes an object from memory immediately when the last reference to it has been removed.
D) The system uses an algorithm to determine when it should periodically remove unused objects.

Accepted Answer

The answer of All of the following statements are true...

Question 16

A function that is a member of a class is called _.
A) a module
B) a method
C) a component
D) an element

Accepted Answer

A function that is a member of a class is called a method. A method is a behavior associated with the object or class. It can be called by the object or class to perform an action or return a value.

Question 17

Class members declared with this access specifier are like private members, except they may be accessed by methods and property procedures in derived classes.
A) Private
B) Public
C) Protected
D) SubClass

Accepted Answer

The access specifier described in the question is "Protected". Protected members can only be accessed in the derived class or subclass by methods and property procedures. Private members are only accessible within the same class, and public members can be accessed by any class. SubClass is not a valid access specifier.

Question 18

The following statements are true about user-defined collections except .
A) indexes for collections start at 0
B) collections can grow dynamically as items are inserted and removed
C) collections hold a variety of different objects
D) you can access the individual items in a collection using the Item property

Accepted Answer

In many programming languages and frameworks, user-defined collections typically have indexes that start at 1, not 0. This is especially true in environments like VBA (Visual Basic for Applications) and some database-related languages. Options B, C, and D are generally true about user-defined collections: they can grow dynamically, hold different types of objects, and allow access to individual items, often through properties like `Item`.

Question 19

What happens when an object variable goes out of scope?
A) The object may be removed from memory by the garbage collector.
B) The object may be referred to using the dot operator.
C) An exception error will be generated.
D) The object becomes accessible again when the variable comes back into scope.

Accepted Answer

When an object variable goes out of scope, it means that the variable is no longer accessible in the current block of code. At this point, the object may be removed from memory by the garbage collector to free up space for other objects.

Question 20

When creating a ToString method to return a string representation of the data stored in an object, you must .
A) override the ToString method, which is inherited from the built-in Object class
B) add a Protected ToString method to the class
C) do nothing as the ToString method automatically performs this for each class
D) a ToString method is a reserved word that cannot be added to a class

Accepted Answer

The ToString method is inherited from the built-in Object class, but it does not return a meaningful representation of the data stored in an object. Therefore, overriding the ToString method allows you to define a custom string representation for your class.

Quiz 12: Classes, Collections, and Inheritance

The class is the portion of the class that is visible to the application programmer.

Which of the following statements will remove an object referred to by the object variable NewStudent?

Which of the following operators determines if two object variables reference the same object?

A constructor is a method named _found inside the class.

The _property is used to get the number of items in a collection.

You access public members of a class object with _.

Which method is used to create a new item in a collection?

An instance of a class is also called ____.

Which of the following displays a message box saying "I have been created" every time a new instance of the class ShowMe is created?

A variable declared inside a class is also known as a .

Which of the following displays a window that lets you browse the classes available to your project?

Object-oriented programming is a way of designing and coding applications such that interchangeable software can be used to build larger programs.

The hiding of data and procedures inside a class is achieved through a process called ___.

Client programs can query _to get values, but they cannot modify them.

All of the following statements are true about the .NET garbage collection utility except .

A function that is a member of a class is called _.

Class members declared with this access specifier are like private members, except they may be accessed by methods and property procedures in derived classes.

The following statements are true about user-defined collections except .

What happens when an object variable goes out of scope?

When creating a ToString method to return a string representation of the data stored in an object, you must .