Week 11

Question 1

New attributes and methods may be added to a subclass.

Answer 1

True

Question 2

One problem with using a UML diagram is that there is no way to indicate inheritance.

Answer 2

false lol the whole point of the diagram is to show inheritance

Question 3

When a class inherits another class, it is required to use all the data attributes and methods of the superclass.

Answer 3

False

Question 4

Polymorphism works on any two class methods that have the same name.

Answer 4

True

Question 5

A superclass inherits attributes and methods from its subclasses without any of them having to be rewritten.

Answer 5

False

Question 6

A subclass may not override any method other than the __init__ method.

Answer 6

False

Question 7

Each subclass has a method named __init__ that overrides the superclass’s __init__ method.

Answer 7

True

Question 8

In a UML diagram depicting inheritance, you only need to write the name of the subclass.

Answer 8

False

Question 9

An “is a” relationship exists between a grasshopper and a bumblebee.

Answer 9

False

Question 10

An “is a” relationship exists between a wrench and a tool.

Question 11

__________ allows a new class to inherit members of the class it extends.
a. Encapsulation
b. Attributes
c. Methods
d. Inheritance

Answer 11

inheritance

Question 12

What gives a program the ability to call the correct method depending on the type of object that is used to call it?
a. Polymorphism
b. Inheritance
c. Encapsulation
d. Methods

Answer 12

a. Polymorphism

Question 13

What does a subclass inherit from a superclass?
a. instances and attributes
b. objects and methods
c. methods and instances
d. attributes and methods

Answer 13

attributes and methods

Question 14

In a UML diagram, what does the open arrowhead point to?
a. the superclass
b. the subclass
c. the object
d. a method

Answer 14

The superclass

Question 15

When there are several classes that have many common data attributes, it is better to write a(n) __________ to hold all the general data.
a. superclass
b. subclass
c. object
d. method

Answer 15

a. superclass

Question 16

In an inheritance relationship, what is a specialized class called?
a. a superclass
b. a subclass
c. an object
d. an instance

Answer 16

a subclass

Question 17

Base classes are also called
a. superclasses
b. derived classes
c. subclasses
d. class instances

Answer 17

a. superclasses

Question 18

What is the relationshop called in which one object is a specialized version of another object?
a. parent-child
b. node-to-node
c. is a
d. class-subclass

Answer 18

c. is a

Question 19

__________ has the ability to define a method in a subclass and then define a method with the same name in a superclass.
a. Inheritance
b. Encapsulation
c. Polymorphism
d. the ‘is a’ relationship

Answer 19

Polymorphism

Question 20

In the following line of code, what is the name of the subclass?
class Rose(Flower):
a. Rose
b. Flower
c. Rose(Flower)
d. None of these

Answer 20

rose

Question 21

In the following line of code, what is the name of the base class?
class Python(Course):
a. Python
b. Course
c. Python(Course)
d. None of these

Answer 21

course

Question 22

Given the following line of code, in a UML diagram, what would the open arrowhead point to?
class Celery(Vegetable):
a. Celery
b. Vegetable
c. class
d. Celery(Vegetable)

Answer 22

vegetable

Question 23

Of the two classes, Cherry and Flavor, which would most likely be the subclass?
a. Cherry
b. Flavor
c. either one
d. neither; these are inappropriate class or subclass names

Answer 23

Cherry

Question 24

Which method can you use to determine whether an object is an instance of a class?
a. isinstance
b. isclass
c. isobject
d. issubclass

Answer 24

isinstance

Question 25

Which of the following is the correct syntax for defining a class, table, which inherits from the furniture class?
a. class furniture[table]:
b. class table.furniture:
c. class furniture(table):
d. class table(furniture):

Answer 25

class table(furniture):

Question 26

Given the following beginning of a class definition for a superclass named clock, how many accessor and mutator methods will be needed to complete the class definition?
class clock:
def __init__(self, shape, color, price):
self._shape = shape
self.color = color
self.price = price
a. 1 mutator, 1 accessor
b. 3 mutator, 4 accessor
c. 3 mutator, 3 accessor
d. 4 mutator, 5 accessor

Answer 26

3 mutator, 3 accessor

Question 27

__________ allows subclasses to have methods with the same names as methods in their superclasses.

Answer 27

Polymorphism

Question 28

The __________ function determines whether or not an object is an instance of a specific class or an instance of a subclass of that class.

Answer 28

isinstance

Question 29

A subclass is also called a(n) __________ class.

Answer 29

derived class

Question 30

A superclass is also called a(n) __________ class.

Answer 30

base

Question 31

When a subclass method has the same name as a superclass method, the subclass method __________ the superclass method.

Answer 31

overrides

Question 32

In an inheritance relationship, the extended class is called the __________.

Answer 32

Superclass

Question 33

New attributes and methods may be added to a subclass which makes it a(n) __________ version of the superclass.

Answer 33

True

Question 34

In an inheritance relationship, a minivan can be thought of as a(n) ___________ of the vehicles class.

Answer 34

Subclass, derived class

Question 35

The term ___________ refers to an object’s ability to take different forms.

Answer 35

Polymorphism