Question 1

A class that is not intended to be instantiated but is to be used only as a base class is called a(n) ____________.

Accepted Answer

A)  abstract class 
B)  dummy class 
C)  placeholder 
D)  entity class 
A)  abstract class 
B)  dummy class 
C)  placeholder 
D)  entity class

Question 2

Which one of the following is a class header indicating that we are defining a class named Amphibian, which is derived from the Animal class?

Accepted Answer

A)  Amphibian : Animal 
B)  Animal(Amphibian) 
C)  Animal->Amphibian 
D)  Amphibian extends Animal 
A)  Amphibian : Animal 
B)  Animal(Amphibian) 
C)  Animal->Amphibian 
D)  Amphibian extends Animal

Question 3

When designing an object-oriented program, the best approach is to define a base class to hold all the general data about a group of similar objects, and then define derived classes for each specific type of object.

Accepted Answer

A) True 
 B)False

Question 4

A class that is not abstract is sometimes called a(n) ____________.

Accepted Answer

A)  concrete class 
B)  base class 
C)  derived class 
D)  abstract class 
A)  concrete class 
B)  base class 
C)  derived class 
D)  abstract class

Question 5

New fields, properties, and methods cannot be added to a derived class unless these elements already existed in the base class.

Accepted Answer

A) True 
 B)False

Question 6

If a reference to a base class object calls a method that has been overridden by a derived class, the derived class's version of the method is the one that executes.

Accepted Answer

A) True 
 B)False

Question 7

To override a property in the __________ you write the override keyword in the property declaration.

Accepted Answer

A)  parameterized constructor 
B)  base class 
C)  field declaration 
D)  derived class 
A)  parameterized constructor 
B)  base class 
C)  field declaration 
D)  derived class

Question 8

In the real world you can find many objects that are specialized versions of more general objects.

Accepted Answer

A) True 
 B)False

Question 9

The term ____________ refers to an object's ability to take different forms.

Accepted Answer

A)  adaptation 
B)  polymorphism 
C)  portability 
D)  code reuse 
A)  adaptation 
B)  polymorphism 
C)  portability 
D)  code reuse

Question 10

Which one of the following is a specialized version of a general food substance?

Accepted Answer

A)  pizza 
B)  chocolate 
C)  ice cream 
D)  all of these 
A)  pizza 
B)  chocolate 
C)  ice cream 
D)  all of these

Question 11

The ____________ declares that a derived class is allowed to override the current method in the base class.

Accepted Answer

A)  override keyword 
B)  class keyword 
C)  virtual keyword 
D)  static keyword 
A)  override keyword 
B)  class keyword 
C)  virtual keyword 
D)  static keyword

Question 12

A statement that tries to use the new operator instantiate an abstract class will not compile.

Accepted Answer

A) True 
 B)False

Question 13

When an "is a" relationship exists between objects, it means that the specialized object has all of the characteristics of the general object, plus additional characteristics that make it unique.

Accepted Answer

A) True 
 B)False

Question 14

A variable declared as a base class type can only be used to reference members declared in the ____________.

Accepted Answer

A)  derived class 
B)  base class 
C)  abstract class 
D)  parameterless constructor 
A)  derived class 
B)  base class 
C)  abstract class 
D)  parameterless constructor

Question 15

If a base class does not have a parameterless constructor, its derived class constructor must use the notation: base(parameterList) to call one of the base class's parameterized constructors.

Accepted Answer

A) True 
 B)False

Question 16

Base classes are sometimes called superclasses, and derived classes are sometimes called ____________.

Accepted Answer

A)  planned classes 
B)  copy classes 
C)  derivatives 
D)  subclasses 
A)  planned classes 
B)  copy classes 
C)  derivatives 
D)  subclasses

Question 17

You cannot assign a base class reference to a derived class variable.

Accepted Answer

A) True 
 B)False

A class that is not intended to be instantiated but is to be used only as a base class is called a(n) ____________.

Which one of the following is a class header indicating that we are defining a class named Amphibian, which is derived from the Animal class?

When designing an object-oriented program, the best approach is to define a base class to hold all the general data about a group of similar objects, and then define derived classes for each specific type of object.

A class that is not abstract is sometimes called a(n) ____________.

New fields, properties, and methods cannot be added to a derived class unless these elements already existed in the base class.

If a reference to a base class object calls a method that has been overridden by a derived class, the derived class's version of the method is the one that executes.

To override a property in the __________ you write the override keyword in the property declaration.

In the real world you can find many objects that are specialized versions of more general objects.

The term ____________ refers to an object's ability to take different forms.

Which one of the following is a specialized version of a general food substance?

The ____________ declares that a derived class is allowed to override the current method in the base class.

A statement that tries to use the new operator instantiate an abstract class will not compile.

When an "is a" relationship exists between objects, it means that the specialized object has all of the characteristics of the general object, plus additional characteristics that make it unique.

A variable declared as a base class type can only be used to reference members declared in the ____________.

If a base class does not have a parameterless constructor, its derived class constructor must use the notation: base(parameterList) to call one of the base class's parameterized constructors.

Base classes are sometimes called superclasses, and derived classes are sometimes called ____________.

You cannot assign a base class reference to a derived class variable.

Introduction to Computers and Programming

Introduction to Visual C#

Processing Data

Making Decisions

Loops, Files, and Random Numbers

Modularizing Your Code with Methods

Arrays and Lists

More About Processing Data

Classes and Multiform Projects

Databases

Filters

Exam 10: Inheritance and Polymorphism

A class that is not intended to be instantiated but is to be used only as a base class is called a(n) ____________.

Which one of the following is a class header indicating that we are defining a class named Amphibian, which is derived from the Animal class?

When designing an object-oriented program, the best approach is to define a base class to hold all the general data about a group of similar objects, and then define derived classes for each specific type of object.

A class that is not abstract is sometimes called a(n) ____________.

New fields, properties, and methods cannot be added to a derived class unless these elements already existed in the base class.

If a reference to a base class object calls a method that has been overridden by a derived class, the derived class's version of the method is the one that executes.

To override a property in the __________ you write the override keyword in the property declaration.

In the real world you can find many objects that are specialized versions of more general objects.

The term ____________ refers to an object's ability to take different forms.

Which one of the following is a specialized version of a general food substance?

The ____________ declares that a derived class is allowed to override the current method in the base class.

A statement that tries to use the new operator instantiate an abstract class will not compile.

When an "is a" relationship exists between objects, it means that the specialized object has all of the characteristics of the general object, plus additional characteristics that make it unique.

A variable declared as a base class type can only be used to reference members declared in the ____________.

If a base class does not have a parameterless constructor, its derived class constructor must use the notation: base(parameterList) to call one of the base class's parameterized constructors.

Base classes are sometimes called superclasses, and derived classes are sometimes called ____________.

You cannot assign a base class reference to a derived class variable.

Introduction to Computers and Programming

Introduction to Visual C#

Processing Data

Making Decisions

Loops, Files, and Random Numbers

Modularizing Your Code with Methods

Arrays and Lists

More About Processing Data

Classes and Multiform Projects

Databases

Filters