Question 1

Which of the following is an accurate definition of the term object-oriented program?
A) An object-oriented program is a specific instance of a user-defined type.
B) An object-oriented program is an encapsulation of data and procedures that has properties and responds to methods.
C) An object-oriented program is populated with objects that hold data, have properties, respond to methods, and raise events.
D) An object-oriented program is a template from which objects are created.

Accepted Answer

Object-oriented programming (OOP) involves creating programs that are populated with objects. These objects are designed to hold data, have properties, respond to methods (functions or procedures), and can raise events to signal state changes or actions. This approach allows for more modular, scalable, and reusable code.

Question 2

Which one of the following statements does NOT accurately describe object-oriented programs?
A) they are populated with objects that don't have properties
B) they are populated with objects that hold data
C) they are populated with objects that respond to methods
D) they are populated with objects that raise events

Accepted Answer

This statement is incorrect as objects in an object-oriented program do have properties. The correct statements are B, C, and D, which accurately describe object-oriented programs. Objects in an object-oriented program hold data and respond to methods, and can also raise events.

Question 3

Which of the following is an example of a control object?
A) string variable
B) array
C) primary key
D) list box

Accepted Answer

A control object is a user interface element that allows users to interact with an application. A list box is a common control object that allows a user to select one or more items from a list. String variables, arrays, and primary keys are not control objects.

Question 4

Which procedure will set default values for member variables when an object is instantiated?
A) Form1_Load
B) Get property procedure
C) New
D) Set property procedure

Accepted Answer

The "New" procedure is used to create a new instance of an object and is responsible for initializing the member variables to their default values. A and D are event handling procedures for a form and property procedures respectively, and are not directly related to setting default values for member variables.

Question 5

Control objects and code objects share many things in common. Which of the following statements applies only to control objects (in other words, which of the following statements does not apply to code objects)?
A) these objects have properties
B) these objects are predefined and have physical manifestations
C) these objects respond to methods
D) these objects are an encapsulation of data and procedures that act on the data

Accepted Answer

Code objects are not predefined and do not have physical manifestations, unlike control objects.

Question 6

An object can be created in the Declaration section of a form's Code editor with a pair of statements of the form.

Accepted Answer

In the Declaration section of a form's Code editor, you can declare variables or objects but cannot instantiate them with a pair of statements. Object instantiation typically occurs within a procedure or function, not in the declaration section.

Question 7

Get property procedures are used to retrieve values of member variables.

Accepted Answer

Get property procedures are used to retrieve values of member variables.

Question 8

Which statement form below carries out a method?
A) objectName.propertyName = value
B) varName = objectName.propertyName
C) objectName.methodName(arg1, ...)
D) RaiseEvent eventName

Accepted Answer

Option C shows a method call which uses the object's methodName followed by its arguments. This indicates an action being performed on the object.

Question 9

Which of the following statements applies to code objects?
A) they are created from the Toolbox
B) they are predefined and have physical manifestations
C) they require the writing of a class block of code
D) they include objects of the type TextBox and ListBox

Accepted Answer

Code objects are created from writing and defining code blocks, specifically class blocks. They do not have physical manifestations like graphical objects created from the Toolbox, and TextBox and ListBox are examples of specific object types that may be used within a code object definition but not necessarily included in all instances of code objects.

Question 10

A class specifies the properties and methods that will be common to all objects that are instances of that class.

Accepted Answer

This statement is true. A class serves as a blueprint or template for creating objects, and all instances of a class will have the same properties and methods specified within the class definition.

Question 11

Which statement form below assigns a value to a property?
A) objectName.propertyName = value
B) varName = objectName.propertyName
C) objectName.methodName(arg1, ...)
D) RaiseEvent eventName

Accepted Answer

Assigning a value to a property requires using the syntax of assigning a value to an object's property, which is represented by the dot notation of objectName.propertyName.

Question 12

Which of the following is an accurate definition of the term class?
A) A class is a specific instance of a user-defined type.
B) A class is an encapsulation of data and procedures that has properties and responds to methods.
C) A class is populated with objects that hold data, have properties, respond to methods, and raise events.
D) A class is a template from which objects are created.

Accepted Answer

A class is a template or a blueprint from which objects are created. Option A is incorrect because an instance is an object created from a class. Option B describes the features of a class but does not give a specific definition. Option C describes objects within a class, not the class itself.

Question 13

Member variables in a class are normally specified as Private.

Accepted Answer

Member variables in a class are typically specified as private to encapsulate the data and prevent it from being accessed or modified directly.

Question 14

Set property procedures are used to assign values to member variables.

Accepted Answer

Set property procedures are indeed used to assign values to member variables, among other things.

Question 15

Which line of code will declare and create an instance of a new object variable called instructor using a class called Faculty?
A) Dim Faculty As instructor
B) Dim instructor As Faculty
C) Dim Faculty As New instructor
D) Dim instructor As New Faculty

Accepted Answer

The correct syntax to declare and create an instance of a new object in many programming languages, such as Visual Basic, is to use the "New" keyword followed by the class name. Therefore, "Dim instructor As New Faculty" correctly declares and creates an instance of the Faculty class.

Question 16

Which one of the following statements does NOT apply to object-oriented programming?
A) Object-oriented programming helps to prevent the complete rewriting of a program every time a minor change needs to be made.
B) Object-oriented programming makes use of the principle of "data hiding."
C) Object-oriented programming makes use of the encapsulation within an object of data and procedures that act on the data.
D) Object-oriented programming depends on the programmer having access to and understanding all of the code that contains the data and procedures that are encapsulated within an object.

Accepted Answer

Object-oriented programming does not necessarily depend on the programmer having access to and understanding all of the code that contains the data and procedures that are encapsulated within an object. In fact, one of the benefits of object-oriented programming is that it allows for modular programming and the ability to hide implementation details from other parts of the program, so that changes can be made to one part of the program without affecting other parts.

Question 17

Two instances of the same class may exist in a single program.

Accepted Answer

It is possible for two instances of the same class to exist in a single program, as long as they have been instantiated separately.

Question 18

Which statement form below assigns the value of a property to a variable?
A) objectName.propertyName = value
B) varName = objectName.propertyName
C) objectName.methodName(arg1, ...)
D) RaiseEvent eventName

Accepted Answer

To assign the value of a property to a variable, we use the syntax varName = objectName.propertyName. Option A assigns a value to a property of an object, Option C calls a method of an object, and Option D raises an event.

Question 19

The New event procedure is automatically invoked when an object is instantiated.

Accepted Answer

The New event procedure is automatically invoked when an object is instantiated.

Question 20

What is the purpose of the Get property procedure?
A) retrieve the value of a property
B) assign values
C) access private methods
D) verify the data

Accepted Answer

The Get property procedure is used to retrieve the value of a property. It is not used to assign values, access private methods, or verify the data.

Quiz 11: Object-Oriented Programming

Which of the following is an accurate definition of the term object-oriented program?

Which one of the following statements does NOT accurately describe object-oriented programs?

Which of the following is an example of a control object?

Which procedure will set default values for member variables when an object is instantiated?

Control objects and code objects share many things in common. Which of the following statements applies only to control objects (in other words, which of the following statements does not apply to code objects) ?

An object can be created in the Declaration section of a form's Code editor with a pair of statements of the form.

Get property procedures are used to retrieve values of member variables.

Which statement form below carries out a method?

Which of the following statements applies to code objects?

A class specifies the properties and methods that will be common to all objects that are instances of that class.

Which statement form below assigns a value to a property?

Which of the following is an accurate definition of the term class?

Member variables in a class are normally specified as Private.

Set property procedures are used to assign values to member variables.

Which line of code will declare and create an instance of a new object variable called instructor using a class called Faculty?

Which one of the following statements does NOT apply to object-oriented programming?

Two instances of the same class may exist in a single program.

Which statement form below assigns the value of a property to a variable?

The New event procedure is automatically invoked when an object is instantiated.

What is the purpose of the Get property procedure?