Python OOP MCQ questions with answers

Question 1 · Easy

What is the output of this code?

class Student:
    def __init__(self, name, grade):
        self.name = name
        self.grade = grade

s = Student("Asha", 11)
print(s.name, s.grade + 1)

• AAsha 12
• BAsha 11
• Cname 12
• DAsha 111

Question 2 · Easy

What is the output of this code?

class Rectangle:
    def __init__(self, width, height):
        self.width = width
        self.height = height

    def area(self):
        return self.width * self.height

r = Rectangle(4, 5)
r.width = 10
print(r.area())

• A20
• B100
• C50
• D45

Question 3 · Easy

What is the output of this code?

class Animal:
    def __init__(self, name):
        self.name = name

    def speak(self):
        return self.name + " makes a sound"

class Cat(Animal):
    def speak(self):
        return self.name + " says meow"

for pet in [Animal("Rex"), Cat("Tom")]:
    print(pet.speak())

• ARex says meow Tom says meow
• BRex makes a sound Tom says meow
• CRex makes a sound Tom makes a sound
• DRex makes a sound Tom makes a sound Tom says meow

Question 4 · Easy

What is the output of this code?

class Account:
    def __init__(self, balance=0):
        self.balance = balance

    def deposit(self, amount):
        self.balance += amount
        return self.balance

acc = Account(100)
acc.deposit(50)
print(acc.deposit(25))

• A125
• B150
• C25
• D175

Question 5 · Medium

What is the output of this code?

class Counter:
    count = 0

    def __init__(self):
        Counter.count += 1

a = Counter()
b = Counter()
c = Counter()
print(Counter.count, a.count)

• A3 1
• B1 1
• C0 3
• D3 3

Question 6 · Medium

What is the output of this code?

class Person:
    def __init__(self, name):
        self.name = name
        print("Person init")

class Teacher(Person):
    def __init__(self, name, subject):
        super().__init__(name)
        self.subject = subject
        print("Teacher init")

t = Teacher("Meera", "Physics")
print(t.name, t.subject)

• ATeacher init Person init Meera Physics
• BPerson init Teacher init Meera Physics
• CTeacher init Meera Physics
• DPerson init Meera Physics

Question 7 · Medium

What is the output of this code?

class Score:
    def __init__(self, points):
        self.points = points

    def __add__(self, other):
        return Score(self.points + other.points)

    def __str__(self):
        return f"{self.points} points"

total = Score(50) + Score(25)
print(total)

• A5025 points
• B75
• C75 points
• D50 points25 points

Question 8 · Medium

What is the output of this code?

class Circle:
    def __init__(self, radius):
        self.radius = radius

    @property
    def diameter(self):
        return self.radius * 2

c = Circle(3)
c.radius = 5
print(c.diameter)

• A10
• B6
• C5
• DNone

Question 9 · Hard

What is the output of this code?

class Dog:
    sound = "woof"

a = Dog()
b = Dog()
a.sound = "grr"
Dog.sound = "bark"
print(a.sound, b.sound)

• Agrr woof
• Bbark bark
• Cgrr bark
• Dgrr grr

Question 10 · Hard

What is the output of this code?

class Team:
    members = []

    def add(self, name):
        self.members.append(name)

red = Team()
blue = Team()
red.add("Asha")
blue.add("Ravi")
print(red.members)

• A['Asha']
• B['Ravi']
• C[]
• D['Asha', 'Ravi']

Question 11 · Hard

What is the output of this code?

class Point:
    def __init__(self, x, y):
        self.x = x
        self.y = y

    def __str__(self):
        return f"({self.x}, {self.y})"

    def __repr__(self):
        return f"Point({self.x}, {self.y})"

p = Point(1, 2)
print(p)
print([p])

• A(1, 2) [Point(1, 2)]
• B(1, 2) [(1, 2)]
• CPoint(1, 2) [Point(1, 2)]
• DPoint(1, 2) [(1, 2)]

Question 12 · Hard

What is the output of this code?

class Temperature:
    unit = "C"

    @classmethod
    def describe(cls):
        return "Unit is " + cls.unit

    @staticmethod
    def to_f(c):
        return c * 9 / 5 + 32

class Kelvin(Temperature):
    unit = "K"

print(Kelvin.describe(), Temperature.to_f(100))

• AUnit is C 212.0
• BUnit is K 212.0
• CUnit is K 212
• DUnit is C 212

Question 13 · Easy

Which error does this code raise?

class Greeter:
    def hello():
        return "hello"

g = Greeter()
print(g.hello())

• ANameError: name 'self' is not defined
• BTypeError: Greeter.hello() takes 0 positional arguments but 1 was given
• CAttributeError: 'Greeter' object has no attribute 'hello'
• DSyntaxError: a method needs a self parameter

Question 14 · Medium

Which error does this code raise?

class Person:
    def __init__(self, name):
        self.name = name

class Student(Person):
    def __init__(self, roll):
        self.roll = roll

s = Student(7)
print(s.roll, s.name)

• AAttributeError: 'Student' object has no attribute 'name'
• BTypeError: __init__() missing 1 required positional argument: 'name'
• CNameError: name 'name' is not defined
• DIt prints 7 None

Question 15 · Medium

Which error does this code raise?

class Circle:
    def __init__(self, radius):
        self.radius = radius

    @property
    def area(self):
        return 3.14 * self.radius ** 2

c = Circle(2)
c.area = 20
print(c.area)

• ATypeError: 'float' object is not callable
• BValueError: area must be computed
• CIt prints 20
• DAttributeError: property 'area' of 'Circle' object has no setter

Question 16 · Easy

Inside a method, what does self refer to?

• AThe class the method belongs to
• BThe parent class
• CThe object the method was called on
• DThe method's return value

Question 17 · Easy

When does a class's __init__ method run?

• AEach time a new object of the class is created
• BOnce, when the class statement is executed
• COnly when the program calls obj.__init__() by name
• DWhen the object is deleted

Question 18 · Medium

If a class does not define __eq__, what does a == b check for two of its objects?

• AWhether all their attributes are equal
• BWhether their __str__ texts are equal
• CWhether a and b are the same object
• DWhether they belong to the same class

Question 19 · Easy

Which class gives each object its own name, so that Pet("Tom").name is "Tom"?

• Aclass Pet: def __init__(name): self.name = name
• Bclass Pet: def __init__(self, name): self.name = name
• Cclass Pet: def __init__(self, name): name = name
• Dclass Pet: def init(self, name): self.name = name

Question 20 · Medium

Class Date has __init__(self, year, month, day). Which method, added to it, makes Date.from_text("2026-10-22") return a new Date?

• Adef from_text(self, text): y, m, d = text.split("-") return self(int(y), int(m), int(d))
• B@classmethod def from_text(text): y, m, d = text.split("-") return Date(int(y), int(m), int(d))
• C@property def from_text(cls, text): y, m, d = text.split("-") return cls(int(y), int(m), int(d))
• D@classmethod def from_text(cls, text): y, m, d = text.split("-") return cls(int(y), int(m), int(d))