Week 15 — Quiz (auto-graded) · Intro to Object-Oriented Programming

Course: Introduction to Computer Science — CS1 / Programming Fundamentals in Python (CSCI 1101) · Silver Oak University (fictional sample) · Prof. Okafor
Objective tested: Objective 8 — classes, objects, attributes, methods, init, and self.
Points: 10 (1 each) · Assignment group: Quizzes (10% of grade) · Due: end of Module 15.

Human-readable quiz with its vetted answer key. Import-ready Classic QTI in F-quiz-week-15-qti.xml (parses with 10 items, one correct per single-answer item). Execution gate: PASS — every keyed output/result was produced by running the code.

Questions, key, and feedback

Q1 (MC). What is the relationship between a CLASS and an OBJECT?
- A. they are the same thing
- B. a class is a blueprint; an object is a specific thing built from it ✅
- C. an object is a blueprint; a class is built from it
- D. a class is a kind of loop
Feedback: A class is the blueprint; an object (instance) is a specific thing built from it. One class, many objects.

Q2 (MC). What special method runs automatically when you create an object, setting up its starting attributes?
- A. start()
- B. __init__ ✅
- C. main()
- D. self()
Feedback: __init__ is the constructor — Python calls it for you when you create the object.

Q3 (MC). What does this print?

class Dog:
    def __init__(self, name):
        self.name = name
    def speak(self):
        return self.name + ' says Woof!'
print(Dog('Rex').speak())

• A. Woof!
• B. Rex says Woof! ✅
• C. Dog says Woof!
• D. says Woof! Rex
  Feedback: __init__ stored 'Rex' as self.name; speak() returns it plus ' says Woof!'. (Run-verified.)

Q4 (MC). What does this print?

class Rectangle:
    def __init__(self, w, h):
        self.width = w
        self.height = h
    def area(self):
        return self.width * self.height
print(Rectangle(3, 4).area())

• A. 7
• B. 12 ✅
• C. 34
• D. 6
  Feedback: area() returns width × height = 3 × 4 = 12. (Run-verified.)

Q5 (MC). What does this print?

class BankAccount:
    def __init__(self, balance):
        self.balance = balance
    def deposit(self, amount):
        self.balance = self.balance + amount
a = BankAccount(100)
a.deposit(50)
print(a.balance)

• A. 100
• B. 50
• C. 150 ✅
• D. 5000
  Feedback: deposit(50) added 50 to the balance attribute: 100 + 50 = 150. The object remembers its state. (Run-verified.)

Q6 (Multiple answer — select all that apply). Which statements about classes and objects are true?
- A. __init__ runs automatically when you create an object ✅
- B. self refers to the object a method is called on ✅
- C. All objects of a class share one copy of each attribute
- D. You store data on an object with self.attribute = value ✅
- E. A class is a blueprint for creating objects ✅
Feedback: A, B, D, E are true. C is false — each object has its own attributes.

Q7 (Matching). Match each term to its meaning.
| Term | Meaning |
|---|---|
| Class | A blueprint for creating objects |
| Object (instance) | A specific thing built from a class |
| Attribute | A piece of an object's data (self.x) |
| Method | A function that belongs to an object |
Feedback: Class = blueprint; object = a thing built from it; attribute = its data; method = its behavior.

Q8 (True / False). "Two objects created from the same class each have their own copy of the attributes, so changing one does not change the other."
- True ✅
- False
Feedback: True. Each instance carries its own state. (Run-verified: two Counters incremented differently gave 2 and 1.)

Q9 (MC). In a method definition like def speak(self):, what is self?
- A. the name of the class
- B. the object the method is called on ✅
- C. a number
- D. a built-in function
Feedback: self is the object the method is acting on; Python passes it automatically when you write d.speak().

Q10 (MC). This class crashes with AttributeError when speak() runs. What is the fix?

class Cat:
    def __init__(self, name):
        name = name
    def speak(self):
        return self.name + ' says Meow'

• A. Rename the class to cat (lowercase)
• B. Change name = name to self.name = name in __init__ ✅
• C. Remove the speak method
• D. Add a semicolon after name = name
  Feedback: name = name never stored the value on the object, so self.name doesn't exist. Use self.name = name. (Run-verified: with self., it prints Milo says Meow.)

Answer key (quick reference)

Quality gate (self-checked): each single-answer item has exactly one correct option; the multiple-answer item keys are exact; the matching item pairs one-to-one. Execution gate: PASS — every printed output (Q3 Rex says Woof!; Q4 12; Q5 150) and the missing-self AttributeError (Q8, Q10) were produced by running the code in Python.

Canvas placement block

canvas_object   = Quizzes::Quiz
title           = "Week 15 Quiz — Intro to Object-Oriented Programming"
assignment_group = "Quizzes"
points_possible = 10
grading_type    = points
due_offset_days = 6
published       = true
shuffle_answers = true
ai_permitted    = false
provenance      = "~ Prof. Okafor's edition · Fall 2026 · built with thecoursemaker.com"