Python Multiple Choice Questions – Inheritance

This set of Python Multiple Choice Questions & Answers (MCQs) focuses on “Inheritance”.

1. Which of the following best describes inheritance?
a) Ability of a class to derive members of another class as a part of its own definition
b) Means of bundling instance variables and methods in order to restrict access to certain class members
c) Focuses on variables and passing of variables to functions
d) Allows for implementation of elegant software that is well designed and easily modified
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2. Which of the following statements is wrong about inheritance?
a) Protected members of a class can be inherited
b) The inheriting class is called a subclass
c) Private members of a class can be inherited and accessed
d) Inheritance is one of the features of OOP
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3. What will be the output of the following Python code?

class Demo:
    def __new__(self):
        self.__init__(self)
        print("Demo's __new__() invoked")
    def __init__(self):
        print("Demo's __init__() invoked")
class Derived_Demo(Demo):
    def __new__(self):
        print("Derived_Demo's __new__() invoked")
    def __init__(self):
        print("Derived_Demo's __init__() invoked")
def main():
    obj1 = Derived_Demo()
    obj2 = Demo()
main()

a)

Derived_Demo’s __init__() invoked
Derived_Demo's __new__() invoked
Demo's __init__() invoked
Demo's __new__() invoked

b)

Derived_Demo's __new__() invoked
Demo's __init__() invoked
Demo's __new__() invoked

c)

Derived_Demo's __new__() invoked
Demo's __new__() invoked

d)

Derived_Demo’s __init__() invoked
Demo's __init__() invoked

4. What will be the output of the following Python code?

class Test:
    def __init__(self):
        self.x = 0
class Derived_Test(Test):
    def __init__(self):
        self.y = 1
def main():
    b = Derived_Test()
    print(b.x,b.y)
main()

a) 0 1
b) 0 0
c) Error because class B inherits A but variable x isn’t inherited
d) Error because when object is created, argument must be passed like Derived_Test(1)
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5. What will be the output of the following Python code?

class A():
    def disp(self):
        print("A disp()")
class B(A):
    pass
obj = B()
obj.disp()

a) Invalid syntax for inheritance
b) Error because when object is created, argument must be passed
c) Nothing is printed
d) A disp()
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6. All subclasses are a subtype in object-oriented programming.
a) True
b) False
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7. When defining a subclass in Python that is meant to serve as a subtype, the subtype Python keyword is used.
a) True
b) False
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8. Suppose B is a subclass of A, to invoke the __init__ method in A from B, what is the line of code you should write?
a) A.__init__(self)
b) B.__init__(self)
c) A.__init__(B)
d) B.__init__(A)
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9. What will be the output of the following Python code?

class Test:
    def __init__(self):
        self.x = 0
class Derived_Test(Test):
    def __init__(self):
        Test.__init__(self)
        self.y = 1
def main():
    b = Derived_Test()
    print(b.x,b.y)
main()

a) Error because class B inherits A but variable x isn’t inherited
b) 0 0
c) 0 1
d) Error, the syntax of the invoking method is wrong
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10. What will be the output of the following Python code?

class A:
    def __init__(self, x= 1):
        self.x = x
class der(A):
    def __init__(self,y = 2):
        super().__init__()
        self.y = y
def main():
    obj = der()
    print(obj.x, obj.y)
main()

a) Error, the syntax of the invoking method is wrong
b) The program runs fine but nothing is printed
c) 1 0
d) 1 2
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11. What does built-in function type do in context of classes?
a) Determines the object name of any value
b) Determines the class name of any value
c) Determines class description of any value
d) Determines the file name of any value
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12. Which of the following is not a type of inheritance?
a) Double-level
b) Multi-level
c) Single-level
d) Multiple
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13. What does built-in function help do in context of classes?
a) Determines the object name of any value
b) Determines the class identifiers of any value
c) Determines class description of any built-in type
d) Determines class description of any user-defined built-in type
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14. What will be the output of the following Python code?

class A:
    def one(self):
        return self.two()
 
    def two(self):
        return 'A'
 
class B(A):
    def two(self):
        return 'B'
obj1=A()
obj2=B()
print(obj1.two(),obj2.two())

a) A A
b) A B
c) B B
d) An exception is thrown
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15. What type of inheritance is illustrated in the following Python code?

class A():
    pass
class B():
    pass
class C(A,B):
    pass

a) Multi-level inheritance
b) Multiple inheritance
c) Hierarchical inheritance
d) Single-level inheritance
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More MCQs on Python Inheritance:

• Python Inheritance MCQ (Set 2)

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