Quiz 9 19FL-IT280-01 - Object Oriented Programming

• Question 1

  4 out of 4 points

  	Although Python is considered an object-oriented language, its syntax does not enforce data encapsulation.
  	Correct Answer:  True

• Question 2

  4 out of 4 points

  	Any object can be pickled before it is saved to a file, and then unpickled as it is loaded from a file into a program.
  	Correct Answer:  True

• Question 3

  4 out of 4 points

  	What are the two parts of a rational number? (Choose two.)
  	Correct Answers: a.  numerator d.  denominator

• Question 4

  4 out of 4 points

  	In Python, when does an object reach the end of its life?
  	Correct Answer: c.  When it can no longer be referred to by the program that created it.

• Question 5

  4 out of 4 points

  	If the parenthesized parent class name is omitted from the class definition, the new class is automatically made a subclass of self.
  	Correct Answer:  False

• Question 6

  4 out of 4 points

  	Python programmers typically capitalize their own class names to distinguish them from variable names.
  	Correct Answer:  True

• Question 7

  4 out of 4 points

  	Most object-oriented languages require the programmer to master the following techniques: data encapsulation, inheritance, and abstraction.
  	Correct Answer:  False

• Question 8

  4 out of 4 points

  	What function do you use to save an object utilizing the pickle module?
  	Correct Answer: c.  pickle.dump

• Question 9

  4 out of 4 points

  	To reduce a rational number to its lowest terms, you first compute the greatest common divisor (GCD) of the numerator and the denominator, using Euclid's algorithm.
  	Correct Answer:  True

• Question 10

  4 out of 4 points

  	If the statements in the try clause raise no exceptions, the except clause is skipped and control proceeds to the end of the try-except statement.
  	Correct Answer:  True

• Question 11

  4 out of 4 points

  	What concept within object-oriented programming involves the restriction of the manipulation of an object's state by external users to a set of method calls?
  	Correct Answer: c.  data encapsulation

• Question 12

  4 out of 4 points

  	The function call str(s) is equivalent to the method call s.__str__().
  	Correct Answer:  True

• Question 13

  4 out of 4 points

  	What statement is an accurate description of the concept of polymorphism in object-oriented programming?
  	Correct Answer: c.  Polymorphism is allowing the several different classes to use the same general method names.

• Question 14

  4 out of 4 points

  	What is the process in which the Python virtual machine recycles its storage known as?
  	Correct Answer: b.  garbage collection

• Question 15

  4 out of 4 points

  	The Python interpreter picks out equality from the other comparisons by looking for an __equals__ method when it encounters the == and != operators.
  	Correct Answer:  False

• Question 16

  4 out of 4 points

  	In the context of Python objects, what does the pickling process do?
  	Correct Answer: b.  It preserves objects by storing them to a file.

• Question 17

  4 out of 4 points

  	What can be used to describe and document the analysis and design of complex software systems?
  	Correct Answer: b.  Unified Modeling Language

• Question 18

  4 out of 4 points

  	Objects in the natural world and objects in the world of artifacts can be classified using inheritance hierarchies.
  	Correct Answer:  True

• Question 19

  4 out of 4 points

  	The scope of an instance variable is the entire module.
  	Correct Answer:  False

• Question 20

  4 out of 4 points

  	What type of programming is defined by the term "imperative programming"?
  	Correct Answer: c.  Programming that involves the use of input and output statements, assignment statements, and control statements for selection and iteration.

• Question 21

  4 out of 4 points

  	The attributes of an object are represented as what type of variables?
  	Correct Answer: a.  instance variables

• Question 22

  4 out of 4 points

  	You are utilizing the pickle.load function to load objects into a program from a file. However, your program raises an exception as soon as the end of the file is reached. What must you do?
  	Correct Answer: a.  Use a try-except statement to catch the exception and continue with the program.

• Question 23

  4 out of 4 points

  	A class variable is visible to all instances of a class and does not vary from instance to instance.
  	Correct Answer:  True

• Question 24

  4 out of 4 points

  	Inheritance allows several different classes to use the same general method names.
  	Correct Answer:  False

• Question 25

  4 out of 4 points

  	At the top, or root of the class hierarchy is the most abstract class. What is the name of this class?
  	Correct Answer: d.  object