Question 1

If you wish to remove a form from a project but you do not want to delete its file from the disk, first right-click on the form's entry in the Solution Explorer window, and on the pop-up menu, click ____________.
A) Hide Form Only
B) Remove From Project
C) Archive Form Data
D) Exclude From Project

Accepted Answer

The best choice is to click "Exclude From Project" as it removes the form from the project without deleting its file from the disk. This allows the file to remain on the disk for future use or reference, without cluttering up the project.

Question 2

Because classes are reference types, objects that are instances of a class are always passed by reference.

Accepted Answer

When an object of a class is passed as a parameter to a method or assigned to another variable, it is passed by reference. This means that changes made to the object within the method or by the new variable will affect the original object.

Question 3

A class's constructor must always use the private access modifier.

Accepted Answer

A class's constructor can have any access modifier (public, private, protected, or default) depending on the visibility and accessibility requirements of the class and its members.

Question 4

When a class's fields are hidden from outside code, its data is vulnerable to accidental corruption.

Accepted Answer

Hiding a class's fields from outside code (encapsulation) actually protects the data from accidental corruption by controlling access through methods.

Question 5

You should never declare a class in its own source file.

Accepted Answer

It is possible and common to declare a class in its own source file. This is known as a header file and is used to provide a class's interface to other parts of a program. However, it is generally good practice to define the implementation of the class in a separate source file.

Question 6

When a class contains a method that uses the public access modifier, the method can be called from code outside the class.

Accepted Answer

When a method is declared with public access modifier, it can be accessed by any code outside the class.

Question 7

A class is not an object but a description of an object.

Accepted Answer

A class is a blueprint or prototype for creating objects. It defines a set of attributes and methods that all objects of that class will have, but the class itself is not an actual object. It is only used to describe the attributes and behaviors of the objects that will be created from it.

Question 8

Suppose a project has a form named SummaryForm. Which one of the following statements creates an instance of the SummaryForm class and assigns it to a variable?
A) SummaryForm.ShowDialog();
B) SummaryForm = this.Form();
C) mySummaryForm = SummaryForm();
D) mySummaryForm = new SummaryForm();

Accepted Answer

To create an instance of the SummaryForm class, the keyword "new" must be used. Therefore, option D is the correct choice as it creates a new instance of the SummaryForm class and assigns it to the variable "mySummaryForm".

Question 9

In code that creates an instance of a class, you access the class object's properties in the same way you would access public variables.

Accepted Answer

In Python, class object's properties are accessed using dot notation, just like accessing public variables. So, in code that creates an instance of a class, you would access the class object's properties in the same way you would access public variables.

Question 10

A class's constructor header must specify a return type of void.

Accepted Answer

A constructor doesn't have a return type, not even void. It's simply declared with the same name as the class and is used to initialize the object's state.

Question 11

When a ____________ is displayed, no other form in the application can receive the focus until the form is closed.
A) static form
B) modal form
C) modeless form
D) primary form

Accepted Answer

A modal form is designed to be a blocking form that requires the user to respond to it before any other forms can receive focus. This makes it the best choice for situations where the user needs to provide input or make a decision before they can continue using the application. Static, modeless, and primary forms do not have this blocking behavior.

Question 12

If you want to show a form in modeless fashion, call its ____________.
A) this.Modeless method
B) Show method
C) ShowDialog method
D) PopUp method

Accepted Answer

The Show method is used to display a form in modeless fashion, meaning that the user can interact with the form and the rest of the application at the same time. The other options listed are not valid methods for displaying a form in modeless fashion.

Question 13

The ____________ displays a form on the screen, and it gives that form the focus.
A) this.Focus method
B) ShowDialog method
C) Activate method
D) NewForm method

Accepted Answer

The ShowDialog method displays a form on the screen and gives that form the focus. This is the best choice among the given options. The other options do not perform the same function as described in the question.

Question 14

When you create an object from a class, you use a reference variable to reference that object.

Accepted Answer

When creating an object from a class, a reference variable is used to reference that object.

Question 15

The same rules for naming variables apply to naming classes.

Accepted Answer

The same rules for naming variables also apply to naming classes. These rules include starting with a letter or underscore, using only letters, numbers, and underscores, and not using reserved words.

Question 16

The class header defines a class's fields, properties, and methods.

Accepted Answer

The class header typically includes the class name and access modifiers, but not the fields, properties, and methods. Those are defined within the class body.

Question 17

The name of a class's constructor is the same as the name of the class.

Accepted Answer

The name of a class's constructor is always the same as the name of the class.

Question 18

A property is a class member that behaves like a public field.

Accepted Answer

A property allows the outside code to read and write a private field of a class in a controlled manner, while it behaves like a public field.

Question 19

A ____________ allows the user to switch focus to another form while it is displayed.
A) modeless form
B) subsidiary form
C) modal form
D) minimized form

Accepted Answer

Modeless forms allow the user to switch focus to another form while it is displayed. Modal forms require the user to interact with it before they can switch to another form. Subsidiary forms are not a commonly used term and minimized forms refer to forms that have been minimized to the taskbar.

Question 20

Writing each class in its own separate file makes your code more organized and helps keep your source code files to a manageable size.

Accepted Answer

Writing each class in its own separate file is a recommended practice in programming to keep the code organized and easy to manage. It helps in modularity, reusability, and maintainability of the code.

Quiz 9: Classes and Multiform Projects

If you wish to remove a form from a project but you do not want to delete its file from the disk, first right-click on the form's entry in the Solution Explorer window, and on the pop-up menu, click ____________.