Question 1

Abstraction involves the restriction of access to one or more of the properties and methods defined within a class.

Accepted Answer

A) True 
 B)False

Question 2

A variable with a global scope can be accessed only within the method it was created in.

Accepted Answer

A) True 
 B)False

Question 3

Which of the following lists reflects a left-to-right increase in variable scope?

Accepted Answer

A)  local, global, class, instance 
B)  local, class, instance, global 
C)  local, instance, class, global 
D)  instance, class, local, global 
A)  local, global, class, instance 
B)  local, class, instance, global 
C)  local, instance, class, global 
D)  instance, class, local, global

Question 4

Global variables begin with the ____ character.

Accepted Answer

A)  @ 
B)  @@ 
C)  $ 
D)  _ 
A)  @ 
B)  @@ 
C)  $ 
D)  _

Question 5

By creating objects based on Ruby's built-in classes, you instantly get access to all the predefined methods that Ruby defines for those objects.

Accepted Answer

A) True 
 B)False

Question 6

With inheritance, the derived class, sometimes referred to as the child class, inherits all of the properties and methods of the parent class.

Accepted Answer

A) True 
 B)False

Question 7

Which of the following types of variables is supported by Ruby?

Accepted Answer

A)  Local 
B)  Global 
C)  Instance 
D)  All of the above 
A)  Local 
B)  Global 
C)  Instance 
D)  All of the above

Question 8

Instance variables begin with the ____ character.

Accepted Answer

A)  @ 
B)  @@ 
C)  $ 
D)  _ 
A)  @ 
B)  @@ 
C)  $ 
D)  _

Question 9

One limitation of inheritance is that you cannot modify the inherited properties and methods or add new ones to customize child classes.

Accepted Answer

A) True 
 B)False

Question 10

When included in a class definition, the initialize method is automatically executed any time an object is instantiated.

Accepted Answer

A) True 
 B)False

Question 11

To control access to the properties and methods within a class, you insert the ____ keyword into the class.

Accepted Answer

A)  public 
B)  private 
C)  protected 
D)  All of the above 
A)  public 
B)  private 
C)  protected 
D)  All of the above

Question 12

Which of the following statements is a benefit of using one of Ruby's built-in classes?

Accepted Answer

A)  You simplify code development by eliminating the need to re-solve already solved programming tasks 
B)  You instantly get access to all of the pre-defined properties in that class. 
C)  You instantly get access to all of the pre-defined methods in that class. 
D)  All of the above 
A)  You simplify code development by eliminating the need to re-solve already solved programming tasks 
B)  You instantly get access to all of the pre-defined properties in that class. 
C)  You instantly get access to all of the pre-defined methods in that class. 
D)  All of the above

Question 13

____ is the process by which one class is derived from another class.

Accepted Answer

A)  Inheritance 
B)  Encapsulation 
C)  Abstraction 
D)  Polymorphism 
A)  Inheritance 
B)  Encapsulation 
C)  Abstraction 
D)  Polymorphism

Question 14

One of the limitations of working with Ruby's built-in classes is that you can read but not modify property values.

Accepted Answer

A) True 
 B)False

Question 15

____ variables are accessible throughout a Ruby program and have an unlimited scope. Every class in the program is allowed to access them.

Accepted Answer

A)  Local 
B)  Global 
C)  Instance 
D)  Class 
A)  Local 
B)  Global 
C)  Instance 
D)  Class

Question 16

With ____ you can build an entire family of classes made up of parents, children, grandchildren, siblings, etc.

Accepted Answer

A)  Polymorphism 
B)  Encapsulation 
C)  Abstraction 
D)  Inheritance 
A)  Polymorphism 
B)  Encapsulation 
C)  Abstraction 
D)  Inheritance

Question 17

Local variables are accessible throughout a Ruby program and have an unlimited scope. Every class in the program is allowed to access them.

Accepted Answer

A) True 
 B)False

Question 18

The ____ keyword makes any specified properties or methods available throughout the program.

Accepted Answer

A)  public 
B)  private 
C)  protected 
D)  closed 
A)  public 
B)  private 
C)  protected 
D)  closed

Question 19

A variable with a ____ scope can be accessed only within the scope that it was created in.

Accepted Answer

A)  local 
B)  global 
C)  instance 
D)  class 
A)  local 
B)  global 
C)  instance 
D)  class

Question 20

____ is the ability to define objects and methods in different forms.

Accepted Answer

A)  Polymorphism 
B)  Encapsulation 
C)  Abstraction 
D)  Inheritance 
A)  Polymorphism 
B)  Encapsulation 
C)  Abstraction 
D)  Inheritance

Abstraction involves the restriction of access to one or more of the properties and methods defined within a class.

A variable with a global scope can be accessed only within the method it was created in.

Which of the following lists reflects a left-to-right increase in variable scope?

Global variables begin with the ____ character.

By creating objects based on Ruby's built-in classes, you instantly get access to all the predefined methods that Ruby defines for those objects.

With inheritance, the derived class, sometimes referred to as the child class, inherits all of the properties and methods of the parent class.

Which of the following types of variables is supported by Ruby?

Instance variables begin with the ____ character.

One limitation of inheritance is that you cannot modify the inherited properties and methods or add new ones to customize child classes.

When included in a class definition, the initialize method is automatically executed any time an object is instantiated.

To control access to the properties and methods within a class, you insert the ____ keyword into the class.

Which of the following statements is a benefit of using one of Ruby's built-in classes?

____ is the process by which one class is derived from another class.

One of the limitations of working with Ruby's built-in classes is that you can read but not modify property values.

____ variables are accessible throughout a Ruby program and have an unlimited scope. Every class in the program is allowed to access them.

With ____ you can build an entire family of classes made up of parents, children, grandchildren, siblings, etc.

Local variables are accessible throughout a Ruby program and have an unlimited scope. Every class in the program is allowed to access them.

The ____ keyword makes any specified properties or methods available throughout the program.

A variable with a ____ scope can be accessed only within the scope that it was created in.

____ is the ability to define objects and methods in different forms.

Ruby Basics

Interacting With Ruby

Working With Strings, Objects, and Variables

Implementing Conditional Logic

Working With Loops

Working With Collections of Data

Working With Regular Expressions

File and Folder Administration

Debugging

Ruby on Rails Web Development

Filters

Exam 8: Object-Oriented Programming

Abstraction involves the restriction of access to one or more of the properties and methods defined within a class.

A variable with a global scope can be accessed only within the method it was created in.

Which of the following lists reflects a left-to-right increase in variable scope?

Global variables begin with the ____ character.

By creating objects based on Ruby's built-in classes, you instantly get access to all the predefined methods that Ruby defines for those objects.

With inheritance, the derived class, sometimes referred to as the child class, inherits all of the properties and methods of the parent class.

Which of the following types of variables is supported by Ruby?

Instance variables begin with the ____ character.

One limitation of inheritance is that you cannot modify the inherited properties and methods or add new ones to customize child classes.

When included in a class definition, the initialize method is automatically executed any time an object is instantiated.

To control access to the properties and methods within a class, you insert the ____ keyword into the class.

Which of the following statements is a benefit of using one of Ruby's built-in classes?

____ is the process by which one class is derived from another class.

One of the limitations of working with Ruby's built-in classes is that you can read but not modify property values.

____ variables are accessible throughout a Ruby program and have an unlimited scope. Every class in the program is allowed to access them.

With ____ you can build an entire family of classes made up of parents, children, grandchildren, siblings, etc.

Local variables are accessible throughout a Ruby program and have an unlimited scope. Every class in the program is allowed to access them.

The ____ keyword makes any specified properties or methods available throughout the program.

A variable with a ____ scope can be accessed only within the scope that it was created in.

____ is the ability to define objects and methods in different forms.

Ruby Basics

Interacting With Ruby

Working With Strings, Objects, and Variables

Implementing Conditional Logic

Working With Loops

Working With Collections of Data

Working With Regular Expressions

File and Folder Administration

Debugging

Ruby on Rails Web Development

Filters