Question 1

A method must be declared __________ for it to be overridden by derived classes.

Accepted Answer

B

Question 2

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

Accepted Answer

In Visual Basic, every class inherits from Object, either directly or indirectly through other classes. This is because Object is the root of the class hierarchy in .NET.

Question 3

Which of the following pairs demonstrates the "is-a" relationship?

Accepted Answer

The pair "baseball, sport" demonstrates the "is-a" relationship because baseball is a type of sport. A car contains an engine but is not a type of engine, while a book may have a table of contents but is not a type of table of contents.

Question 4

To avoid duplicating code (and possibly errors),use ________,rather than ________.

Accepted Answer

Inheritance allows code to be reused and avoids the need to duplicate code. The "copy-and-paste" approach, on the other hand, can lead to errors and requires any changes to be manually updated in multiple locations.

Question 5

__________ is a form of xe "code reuse"xe "software reuse"software reuse in which a new class is created quickly and easily by absorbing an existing class's members and customizing them with new or modified capabilities.

Accepted Answer

Inheritance is a form of software reuse where a new class is created by absorbing an existing class's members and customizing them with new or modified capabilities. This allows for code reuse and saves time in development.

Question 6

A base class's constructors are inherited into its derived classes.

Accepted Answer

Constructors are never inherited-they are specific to the class in which they are declared.

Question 7

Which of the following could be a base class for class Computer?

Accepted Answer

"Machine" is the most general term that encompasses all the components of a computer, such as the CPU, motherboard, RAM, and other peripherals. Hard-drive, software, and keyboard are all specific components that could be part of a computer, but they are not as general as the term "machine".

Question 8

An advantage of inheritance is that:

Accepted Answer

Inheritance allows objects of a derived class to be treated as objects of their base class. This is advantageous because it allows for code reuse and helps to simplify the program structure. While A and B are technically true statements about inheritance, they do not represent the most significant advantage of inheritance.

Question 9

A base class may have only one derived class.

Accepted Answer

A base class may have many derived classes.

Question 10

A derived class can add its own instance variables,Shared variables,properties and methods,and it can customize methods and properties it inherits.

Accepted Answer

A derived class can add its own instance variables, shared variables, properties, and methods, and it can also override or customize the methods and properties it inherits from its base class.

Question 11

Every class in Visual Basic except __________ extends an existing class.

Accepted Answer

Every class in Visual Basic except Object extends an existing class. The Object class is the root of the Visual Basic class hierarchy and is the superclass of all other Visual Basic classes.

Question 12

A base class is more specific than its derived class and represents a more specialized group of objects.

Accepted Answer

A derived class is more specific than its base class and represents a more specialized group of objects.

Question 13

Inheritance is represented by a(n)_________ relationship.

Accepted Answer

Inheritance is represented by an "is-a" relationship, where a subclass is a specialized version of a superclass.

Question 14

Which of the following is not a base/derived class relationship?

Accepted Answer

A sailboat and a tugboat are not related in a base/derived class relationship as they do not share a common hierarchy of characteristics and functionality.

Question 15

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the __________ class,and the new class is the __________ class.

Accepted Answer

The existing class is often referred to as the base class or superclass, while the new class is referred to as the derived class or subclass. Therefore, option D is the correct choice.

Question 16

A class inherited from two or more levels up in the hierarchy is known as a(n) .

Accepted Answer

An indirect base class is a class that is inherited from two or more levels up in the hierarchy. This means that it is not a direct parent class, but rather a grandparent or higher level ancestor class that is inherited through a chain of inheritance. A direct base class, on the other hand, is the immediate parent class. The term superclass can be used to refer to any class higher up in the hierarchy, regardless of whether it is a direct or indirect base class. Therefore, the best choice is A) indirect base class.

Question 17

The default implementation of method ToString of Object returns a String representing ________.

Accepted Answer

The answer of The default implementation of method ToString of...

Question 18

Polymorphism enables you to conveniently xe "program in the general"program "in the general" rather than "xe "program in the specific"in the specific."

Accepted Answer

Polymorphism allows you to use the same code to work with different types of objects, so you can write more generic and reusable code instead of coding for specific types.

Question 19

Which of the following pairs demonstrates the "has-a" relationship?

Accepted Answer

A "has-a" relationship is when one object contains or is composed of another object. A house "has-a" window.

Question 20

The class hierarchy begins with class __________.

Accepted Answer

The class hierarchy typically begins with class Object in most object-oriented programming languages, including Java and C#.

Quiz 10: Object-Oriented Programming: Inheritance

A method must be declared __________ for it to be overridden by derived classes.

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

Which of the following pairs demonstrates the "is-a" relationship?

To avoid duplicating code (and possibly errors) ,use ,rather than .

__________ is a form of xe "code reuse"xe "software reuse"software reuse in which a new class is created quickly and easily by absorbing an existing class's members and customizing them with new or modified capabilities.

A base class's constructors are inherited into its derived classes.

Which of the following could be a base class for class Computer?

An advantage of inheritance is that:

A base class may have only one derived class.

A derived class can add its own instance variables,Shared variables,properties and methods,and it can customize methods and properties it inherits.

Every class in Visual Basic except __________ extends an existing class.

A base class is more specific than its derived class and represents a more specialized group of objects.

Inheritance is represented by a(n) _________ relationship.

Which of the following is not a base/derived class relationship?

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the class,and the new class is the class.

A class inherited from two or more levels up in the hierarchy is known as a(n) .

The default implementation of method ToString of Object returns a String representing ________.

Polymorphism enables you to conveniently xe "program in the general"program "in the general" rather than "xe "program in the specific"in the specific."

Which of the following pairs demonstrates the "has-a" relationship?

The class hierarchy begins with class __________.

Quiz 10: Object-Oriented Programming: Inheritance

A method must be declared __________ for it to be overridden by derived classes.

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

Which of the following pairs demonstrates the "is-a" relationship?

To avoid duplicating code (and possibly errors) ,use ________,rather than ________.

__________ is a form of xe "code reuse"xe "software reuse"software reuse in which a new class is created quickly and easily by absorbing an existing class's members and customizing them with new or modified capabilities.

A base class's constructors are inherited into its derived classes.

Which of the following could be a base class for class Computer?

An advantage of inheritance is that:

A base class may have only one derived class.

A derived class can add its own instance variables,Shared variables,properties and methods,and it can customize methods and properties it inherits.

Every class in Visual Basic except __________ extends an existing class.

A base class is more specific than its derived class and represents a more specialized group of objects.

Inheritance is represented by a(n) _________ relationship.

Which of the following is not a base/derived class relationship?

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the __________ class,and the new class is the __________ class.

A class inherited from two or more levels up in the hierarchy is known as a(n) .

The default implementation of method ToString of Object returns a String representing ________.

Polymorphism enables you to conveniently xe "program in the general"program "in the general" rather than "xe "program in the specific"in the specific."

Which of the following pairs demonstrates the "has-a" relationship?

The class hierarchy begins with class __________.

To avoid duplicating code (and possibly errors) ,use ,rather than .

When creating a class,rather than declaring completely new members,you can designate that the new class inherits the members of an existing class.The existing class is called the class,and the new class is the class.