Question 1

Object-oriented programming allows us to hide the object's data attributes from code that is outside the object.

Accepted Answer

Encapsulation is a fundamental principle of object-oriented programming that allows data to be hidden or protected from outside code. This is achieved through the use of access modifiers on class members, such as private, protected, and public.

Question 2

Which section in the UML holds the list of the class's methods?
A) first section
B) second section
C) third section
D) fourth section

Accepted Answer

In UML (Unified Modeling Language) class diagrams, the class is typically divided into three sections: the first section contains the class name, the second section contains the attributes or properties, and the third section holds the list of the class's methods or operations.

Question 3

Procedures operate on data items that are separate from the procedures.

Accepted Answer

Procedures are designed to operate on data items, but the data items are typically passed to the procedures as parameters or accessed through variables rather than being part of the procedure itself. This separation between procedures and data is an important aspect of modular programming, which allows for greater flexibility, reusability, and maintainability of code.

Question 4

The self parameter need not be named self but it is strongly recommended to do so,to conform with standard practice.

Accepted Answer

It is a convention to name the first parameter of a method as 'self' in Python so that it is easily recognizable as a reference to the object calling the method. While it is not mandatory to use 'self', it is strongly recommended to follow this convention to ensure readability and maintainability of the code.

Question 5

Which method is automatically called when you pass an object as an argument to the print function?
A) __state__
B) __obj__
C) __str__
D) __init__

Accepted Answer

The __str__ method is automatically called when you pass an object as an argument to the print function. This is because it is the method responsible for providing a string representation of the object, which is what the print function needs to display the object. The other methods listed ( __state__, __obj__, __init__) are not automatically called by the print function.

Question 6

Which method is automatically executed when an instance of a class is created in memory?
A) __state__
B) __obj__
C) __str__
D) __init__

Accepted Answer

The method __init__() is automatically executed when an instance of a class is created in memory. This method initializes the attributes of the newly created object. Therefore, option D is the correct answer.

Options A, B, and C are incorrect as these methods are not automatically executed when an instance of a class is created in memory.

- __state__ is not a special method in Python.
- __obj__ is also not a valid special method in Python.
- __str__() method is used to return a string representation of an object and is not automatically executed when an instance of a class is created in memory.

Question 7

All class definitions are stored in the library so that they can be imported into any program.

Accepted Answer

Class definitions can be created by programmers and are not necessarily stored in a library. They can be defined directly in a program's code or in separate files that are then imported into a program.

Question 8

All instances of a class share the same values of the data attributes in the class.

Accepted Answer

Each instance of a class can have its own set of values for the data attributes in the class.

Question 9

A class can be thought of as a blueprint that can be used to create an object.

Accepted Answer

A class defines the properties and methods that an object can have. When creating an object based on a class, it is essentially using the blueprint to construct an instance of that object with its designated properties and methods.

Question 10

What type of method provides a safe way for code outside a class to retrieve the values of attributes,without exposing the attributes in a way that could allow them to be changed by code outside the method?
A) accessor
B) mutator
C) setter
D) class

Accepted Answer

Accessor methods, also known as getters, provide a safe way for code outside a class to retrieve the values of attributes, without exposing the attributes in a way that could allow them to be changed by code outside the method. Mutator methods, also known as setters, allow code outside the class to change the attribute values. The class is the blueprint for creating objects, and doesn't directly relate to providing a safe way for code to retrieve attribute values.

Question 11

Which section in the UML holds the list of the class's data attributes?
A) first section
B) second section
C) third section
D) fourth section

Accepted Answer

The second section in the UML class diagram is the attributes section, which holds the list of the class's data attributes.

Question 12

A mutator method has no control over the way that a class's data attributes are modified.

Accepted Answer

A mutator method is a method that is used to modify the data attributes of a class. Therefore, it has complete control over how these attributes are modified. The statement in the question is false.

Question 13

Which attributes belong to a specific instance of a class?
A) instance
B) self
C) object
D) data

Accepted Answer

An instance of a class is a specific occurrence or realization of the class, and all its attributes and properties belong to that particular instance.

Answer: B
 In object-oriented programming, 'self' refers to the instance of the class on which a method or attribute is invoked, and therefore, it indicates the specific attributes and properties of that instance.

Answer: D
 Data can be used to refer to the specific values or characteristics of an instance of a class. Therefore, the attributes that belong to a particular instance of a class can be considered as its data.

Question 14

What is the special name given to the method that returns a string containing an object's state?
A) __state__
B) __obj__
C) __str__
D) __init__

Accepted Answer

The special name given to the method that returns a string containing an object's state is called "__str__". Option A is not a predefined special method. Option B doesn't make sense as it is too generic. Option D is a special method used for initializing objects.

Question 15

What does the acronym UML stand for?
A) Unified Modeling Language
B) United Modeling Language
C) Unified Model Language
D) Union of Modeling Languages

Accepted Answer

UML stands for Unified Modeling Language, which is a standardized modeling language used in software engineering for visualizing and designing software systems.

Question 16

What type of programming contains class definitions?
A) procedural
B) top-down
C) object-oriented
D) modular

Accepted Answer

Class definitions are a fundamental aspect of object-oriented programming, which is characterized by the use of objects that encapsulate data and behavior within a defined scope of a class. Choice C, object-oriented programming, provides this capability.

Question 17

In a UML diagram the first section holds the list of the class's methods.

Accepted Answer

In a UML diagram, the first section holds the class's name, the second section contains the class's attributes, and the third section lists the class's methods.

Question 18

The procedures that an object performs are called
A) methods
B) actions
C) modules
D) instances

Accepted Answer

The procedures that an object performs are called methods.

Question 19

The self parameter is required in every method of a class.

Accepted Answer

The self parameter is required in every method of a class because it refers to the instance of the class that the method is being called on. This allows the method to access the instance's attributes and methods.

Question 20

An object is a stand-alone program but is used by programs that need its service.

Accepted Answer

An object is not a stand-alone program; it is an instance of a class in object-oriented programming, which encapsulates data and behavior related to that data, and is used within programs to implement specific functionalities.

Quiz 10: Classes and Object-Oriented Programming

Object-oriented programming allows us to hide the object's data attributes from code that is outside the object.

Which section in the UML holds the list of the class's methods?

Procedures operate on data items that are separate from the procedures.

The self parameter need not be named self but it is strongly recommended to do so,to conform with standard practice.

Which method is automatically called when you pass an object as an argument to the print function?

Which method is automatically executed when an instance of a class is created in memory?

All class definitions are stored in the library so that they can be imported into any program.

All instances of a class share the same values of the data attributes in the class.

A class can be thought of as a blueprint that can be used to create an object.

What type of method provides a safe way for code outside a class to retrieve the values of attributes,without exposing the attributes in a way that could allow them to be changed by code outside the method?

Which section in the UML holds the list of the class's data attributes?

A mutator method has no control over the way that a class's data attributes are modified.

Which attributes belong to a specific instance of a class?

What is the special name given to the method that returns a string containing an object's state?

What does the acronym UML stand for?

What type of programming contains class definitions?

In a UML diagram the first section holds the list of the class's methods.

The procedures that an object performs are called

The self parameter is required in every method of a class.

An object is a stand-alone program but is used by programs that need its service.