Question 1

In a three-tier architecture, only the presentation tier will actually read and write data.

Accepted Answer

In a three-tier architecture, the presentation tier is responsible for displaying the data to the user, the application tier handles the business logic and processing of data, and the data tier stores and manages the data. All three tiers may read and write data, depending on the specific requirements of the application.

Question 2

Whenever inheritance is used, the subclass must always fit into a "has-a" relationship with the base class. _________________________

Accepted Answer

When inheritance is used, the subclass fits into an "is-a" relationship with the base class, not a "has-a" relationship.

Question 3

Inheritance allows one class to gain ____ from another class.

Accepted Answer

A,C

Question 4

The ____ tier is a tier within the three-tier structure into which programs are divided.

Accepted Answer

The answer of The ____ tier is a tier within...

Question 5

The ____ property should be tested to ensure that a masked textbox contains characters for the entire mask area.

Accepted Answer

The MaskFull property should be tested to ensure that a masked textbox contains characters for the entire mask area. This property determines whether all required character positions have been entered in the control. If MaskFull returns true, then the user has entered all required characters and the input can be accepted.

Question 6

The SelectedIndex property of a ComboBox object will contain the value ____ if a selection has been made.

Accepted Answer

The SelectedIndex property of a ComboBox object contains the index of the selected entry in the drop-down list. Since the index of the first entry in the list is 0, the value of SelectedIndex will be 0 if the first entry is selected. However, the SelectedIndex property will only contain a meaningful value if a selection has been made. If no selection has been made, the value of SelectedIndex will be -1. Therefore, option A is incorrect. Option D is also incorrect since the SelectedIndex property is an integer value, not a Boolean value. Option C is the correct choice as it indicates that the property will contain the index value of the selected entry in the drop-down list.

Question 7

When a program becomes large and complex, the necessary process is often divided into _______.

Accepted Answer

The answer of When a program becomes large and complex,...

Question 8

Data access tier is another name for the presentation tier. _________________________

Accepted Answer

The data access tier is responsible for retrieving and manipulating data from the database, while the presentation tier is responsible for presenting the data to the user through a graphical user interface. They are two separate tiers in the three-tier architecture.

Question 9

The code in a constructor procedure executes after any other code in the object. _________________________

Accepted Answer

before

Question 10

The TabIndex property determines which object on a form receives the focus when the user presses the ____ key.

Accepted Answer

The TAB key moves the focus to the next control on the form based on the order of the TabIndex property. Therefore, setting the TabIndex for each control in the desired order can help improve the user's navigation and form usability.

Question 11

In a three-tier architecture, only the persistence classes will actually ____ data.

Accepted Answer

The answer of In a three-tier architecture, only the persistence...

Question 12

To use a three-tier structure for a program, you must divide the processing into ____.

Accepted Answer

A three-tier architecture typically consists of a presentation tier, application tier, and data tier. The application tier, also known as the logic tier or middle tier, is where the processing is divided into classes, which make up the business logic of the application. The presentation tier handles the user interface, while the data tier deals with database management. Therefore, C is the correct choice as it directly relates to the application tier.

Question 13

The MaskFull property will return a value of ____ if the mask area of a masked textbox is not completely filled.

Accepted Answer

The MaskFull property will return a value of False if the mask area of a masked textbox is not completely filled.

Question 14

Concatenation is a major contributor to reliable and robust programs. _________________________

Accepted Answer

Encapsulation

Question 15

The WriteLine procedure will ____.

Accepted Answer

The answer of The WriteLine procedure will ____.
...

Question 16

In a three-tier architecture, the ____ tier contains the classes that display information and accept user input.

Accepted Answer

The presentation tier is responsible for presenting data to the user and accepting user input. This tier contains the user interface components such as forms, screens, and reports.

Question 17

In a three-tier architecture, the business tier contains the ____ that must occur to fulfill the requirements of the program.

Accepted Answer

The answer of In a three-tier architecture, the business tier...

Question 18

To specify the sequence of objects (like those in the accompanying figure) that will be selected when the TAB key is pressed, the ____ property is used.

Accepted Answer

The TabIndex property is used to specify the sequence in which objects are selected when the TAB key is pressed. This property allows for customization of the tab order in a form or control.

Question 19

____ is a major contributor to reliable and robust programs.

Accepted Answer

Encapsulation is a technique of wrapping the data members and methods under a single unit. It is one of the fundamental principles of object-oriented programming that helps in achieving data abstraction and information hiding. Encapsulation ensures that the internal state of the object is protected from the outside world and can only be accessed through a public interface. This makes the programs more robust and reliable, as the internal details of the object are hidden and cannot be accidentally modified by other parts of the program.

Question 20

In a ComboBox object, the SelectedIndex property will contain a value of ____ if no selection has been made.

Accepted Answer

If no selection has been made in the ComboBox object, the SelectedIndex property will contain a value of -1.

Quiz 11: Multiple Classes and Inheritance