Unit 5: Classes and objects; Object oriented programming terminology - Practice Quiz

1 Which keyword is used to define a class in Python?

2 What is an object in Python?

3 Which method is automatically called when a new object of a class is created?

4 What does the 'self' parameter represent in a class method?

5 How do you access the attribute 'name' of an object 'obj'?

6 Which of the following correctly creates an instance of a class named 'Car'?

7 What is the output of the following code?
class A:
def init(self):
self.x = 1
a = A()
print(a.x)

8 Which feature of OOP allows a class to derive properties from another class?

9 What is the correct syntax to create a class 'Child' that inherits from 'Parent'?

10 What happens when a method in a child class has the same name as a method in the parent class?

11 How do you achieve data hiding in Python to make an attribute private?

12 Does Python support function overloading (multiple methods with the same name but different arguments) natively?

13 Which function is used to determine if a class is a subclass of another class?

14 What is the purpose of the 'super()' function?

15 What is a class variable?

16 If you try to access a private variable 'secret' from outside the class directly using 'obj.secret', what happens?

17 Which special method is known as the destructor?

18 What is the output?
class Test:
def init(self):
print('Hello')
t = Test()

19 In Python, what is the result of 'isinstance(obj, ClassName)'?

20 Which concept implies wrapping data and methods into a single unit?

21 How can you simulate function overloading in Python?

22 What is Multiple Inheritance?

23 Which dictionary contains the namespace of a class or object?

24 What is the output?
class Dog:
legs = 4
d1 = Dog()
d2 = Dog()
d1.legs = 3
print(d1.legs, d2.legs)

25 Consider 'class A: pass' and 'class B(A): pass'. What is B.bases?

26 When overriding a method, how can you ensure the parent class's logic for that method is also executed?

27 What is the built-in string representation method meant for developers/debugging?

28 If a class does not define an init method, what happens?

29 What implies that a variable or method is 'protected' (convention only) in Python?

30 Can you add attributes to an instance object after it has been created?

31 What is MRO in the context of Python inheritance?

32 Given: 'class A: pass'. What is type(A)?

33 What is the output?
class P:
def show(self): print('P')
class C(P):
def show(self): print('C')
c = C()
c.show()

34 How do you access a private variable '__hidden' of class 'Test' from outside via name mangling?

35 Which parameter is not required when calling an instance method, even though it is defined in the method signature?

36 What is the output?
class X:
def m(self, a=None):
if a: print(a)
else: print('Empty')
x = X()
x.m()
x.m(5)

37 Which of the following is FALSE about class attributes?

38 In class MyClass(object):, what is 'object'?

39 What keyword is used to delete a reference to an object?

40 What defines the documentation string (docstring) of a class?

41 What is the output?
class A:
count = 0
print(A.count)

42 Polymorphism in Python is best demonstrated by:

43 If Class B inherits from Class A, which class is the Superclass?

44 What happens if you define def __init__(self, a): and def __init__(self, a, b): in the same class?

45 Which built-in function returns the attributes and methods of an object?

46 Can a class call a method defined in its own class?

47 What is the default return value of init?

48 Which of the following represents an 'Is-A' relationship?

49 When using Data Hiding, the data is:

50 What is the output?
class A:
def f(self): return 1
class B(A):
def f(self): return 2
obj = B()
print(obj.f())