Question 1

Private fields of a base class can be accessed in a derived class

Accepted Answer

A) by calling Private methods declared in the base class 
B) by calling Public or Protected methods declared in the base class 
C) directly 
D) All of the above 
A) by calling Private methods declared in the base class 
B) by calling Public or Protected methods declared in the base class 
C) directly 
D) All of the above

Question 2

When a program creates a derived-class object,the Object constructor is the last constructor called and the first whose body finishes executing.

Accepted Answer

A) True 
 B)False

Question 3

Declaring an interface Protected allows for extra security precautions.

Accepted Answer

A) True 
 B)False

Question 4

Which is used to specify that a class will be implementing an interface?

Accepted Answer

A) Using 
B) : 
C) Implements 
D) Extends. 
A) Using 
B) : 
C) Implements 
D) Extends.

Question 5

When a derived class constructor calls its base class constructor,what happens if the base class's constructor does not assign a value to one of its instance variables?

Accepted Answer

A) a syntax error occurs 
B) a compile-time error occurs 
C) a run-time error occurs 
D) the instance variables are initialized to their default values 
A) a syntax error occurs 
B) a compile-time error occurs 
C) a run-time error occurs 
D) the instance variables are initialized to their default values

Question 6

An interface is typically used in place of a MustInherit class when there is no default implementation to inherit.

Accepted Answer

A) True 
 B)False

Question 7

Objects of abstract base classes can be instantiated.

Accepted Answer

A) True 
 B)False

Question 8

The _________ keyword is used to define methods within a MustInherit class that must be implemented in a derived class for that derived class to be concrete.

Accepted Answer

A) Overridable 
B) Abstract 
C) MustOverride 
D) MustImplement. 
A) Overridable 
B) Abstract 
C) MustOverride 
D) MustImplement.

Question 9

Polymorphism allows the addition of classes providing they were at least considered during program development.

Accepted Answer

A) True 
 B)False

Question 10

A class may implement only one interface.

Accepted Answer

A) True 
 B)False

Question 11

The ________ keyword is used to create an abstract class.

Accepted Answer

A) Polymorph 
B) Inherit 
C) Abstract 
D) MustInherit 
A) Polymorph 
B) Inherit 
C) Abstract 
D) MustInherit

Question 12

Consider the classes below:  
Which of the statements below is false?

Accepted Answer

A) Both variables a and b are instance variables. 
B) After the constructor for Class B executes,the variable a will have the value 7. 
C) After the constructor for Class B executes,the variable b will have the value 8. 
D) A reference to an object of Class A can be treated as a reference to an object of Class B. 
A) Both variables a and b are instance variables. 
B) After the constructor for Class B executes,the variable a will have the value 7. 
C) After the constructor for Class B executes,the variable b will have the value 8. 
D) A reference to an object of Class A can be treated as a reference to an object of Class B.

Question 13

The purpose of an interface is to:

Accepted Answer

A) provide similar objects with the same functionality,even though each will implement the functionality differently 
B) provide different objects with the same functionality,even though each will implement the functionality differently 
C) provide default implementations of methods and properties 
D) None of the above. 
A) provide similar objects with the same functionality,even though each will implement the functionality differently 
B) provide different objects with the same functionality,even though each will implement the functionality differently 
C) provide default implementations of methods and properties 
D) None of the above.

Question 14

An interface always should be used to specify data and services that will be provided by objects in a hierarchical relationship.

Accepted Answer

A) True 
 B)False

Question 15

The Protected members of a base class may be accessed in their class or any classes derived from that base class.

Accepted Answer

A) True 
 B)False

Question 16

If a class leaves one method in an interface undeclared,the class is implicitly declared by Visual Basic as a MustInherit class.

Accepted Answer

A) True 
 B)False

Question 17

When a request is made to use a derived-class-object method through a base-class reference,Visual Basic polymorphically chooses the correct overridden method in the derived class that is associated with the object.

Accepted Answer

A) True 
 B)False

Question 18

A class that implements an interface must define all methods and properties of that interface.

Accepted Answer

A) True 
 B)False

Question 19

All classes in Visual Basic have Object as either a direct or indirect base class.

Accepted Answer

A) True 
 B)False

Question 20

When a base class method is overridden in a derived class,it is common to have the derived class version call the base class version and then do some additional work.

Accepted Answer

A) True 
 B)False

Exam 10: Object-Oriented Programming: Inheritance

Private fields of a base class can be accessed in a derived class

When a program creates a derived-class object,the Object constructor is the last constructor called and the first whose body finishes executing.

Declaring an interface Protected allows for extra security precautions.

Which is used to specify that a class will be implementing an interface?

When a derived class constructor calls its base class constructor,what happens if the base class's constructor does not assign a value to one of its instance variables?

An interface is typically used in place of a MustInherit class when there is no default implementation to inherit.

Objects of abstract base classes can be instantiated.

The _________ keyword is used to define methods within a MustInherit class that must be implemented in a derived class for that derived class to be concrete.

Polymorphism allows the addition of classes providing they were at least considered during program development.

A class may implement only one interface.

The ________ keyword is used to create an abstract class.

Consider the classes below: Which of the statements below is false?

The purpose of an interface is to:

An interface always should be used to specify data and services that will be provided by objects in a hierarchical relationship.

The Protected members of a base class may be accessed in their class or any classes derived from that base class.

If a class leaves one method in an interface undeclared,the class is implicitly declared by Visual Basic as a MustInherit class.

When a request is made to use a derived-class-object method through a base-class reference,Visual Basic polymorphically chooses the correct overridden method in the derived class that is associated with the object.

A class that implements an interface must define all methods and properties of that interface.

All classes in Visual Basic have Object as either a direct or indirect base class.

When a base class method is overridden in a derived class,it is common to have the derived class version call the base class version and then do some additional work.

Introduction to Computers, the Internet and Visual Basic

Dive Into Visual Basic Express 2012 Express

Introduction to Visual Basic Programming

Introduction to Problem Solving and Control Statements

Problem Solving and Control Statements

Methods

Arrays

Files and Streams

Object-Oriented Programming: Classes and Objects

Introduction to Linq

Databases and LINQ to SQL

Web App Developing in Aspnet With Vb

Windows Forms Gui: a Deeper Look

Graphics and Multimedia

Exception Handling

Strings and Characters: a Deeper Look

Files and Streams

Xml and Linq to Xml

Windows 8 Ui Xaml

Windows 8 Graphics and Multimedia

Windows Phone 8 Case Study

Asynchronous Programming With Async and Await

Web App Development With Aspnet: a Deeper Look

Web Services

Windows Azure Cloud Computing Case Study

Visual Basic 2012 How to Program

Visual Basic 2012 How to Program

Data Structures and Generic Collections

Filters