Python Questions and Answers – Encapsulation

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

1. Which of these is not a fundamental features of OOP?
a) Encapsulation
b) Inheritance
c) Instantiation
d) Polymorphism
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2. Which of the following is the most suitable definition for encapsulation?
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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3. What is the output of the following code?

class Demo:
    def __init__(self):
        self.a = 1
        self.__b = 1
 
    def display(self):
        return self.__b
obj = Demo()
print(obj.a)

a) The program has an error because there isn’t any function to return self.a
b) The program has an error because b is private and display(self) is returning a private member
c) The program runs fine and 1 is printed
d) The program has an error as you can’t name a class member using __b
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4. What is the output of the following code?

class Demo:
    def __init__(self):
        self.a = 1
        self.__b = 1
 
    def display(self):
        return self.__b
 
obj = Demo()
print(obj.__b)

a) The program has an error because there isn’t any function to return self.a
b) The program has an error because b is private and display(self) is returning a private member
c) The program has an error because b is private and hence can’t be printed
d) The program runs fine and 1 is printed
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5. Methods of a class that provide access to private members of the class are called as ______ and ______
a) getters/setters
b) __repr__/__str__
c) user-defined functions/in-built functions
d) __init__/__del__
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6. Which of these is a private data field?

def Demo:
def __init__(self):
    __a = 1
    self.__b = 1
    self.__c__ = 1
    __d__= 1

a) __a
b) __b
c) __c__
d) __d__
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7. What is the output of the following code?

class Demo:
     def __init__(self):
         self.a = 1
         self.__b = 1
 
     def get(self):
         return self.__b
 
obj = Demo()
print(obj.get())

a) The program has an error because there isn’t any function to return self.a
b) The program has an error because b is private and display(self) is returning a private member
c) The program has an error because b is private and hence can’t be printed
d) The program runs fine and 1 is printed
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8. What is the output for the following piece of code?

class Demo:
     def __init__(self):
         self.a = 1
         self.__b = 1
     def get(self):
         return self.__b
obj = Demo()
obj.a=45
print(obj.a)

a) The program runs properly and prints 45
b) The program has an error because the value of members of a class can’t be changed from outside the class
c) The program runs properly and prints 1
d) The program has an error because the value of members outside a class can only be changed as self.a=45
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9. Private members of a class cannot be accessed. True or False?
a) True
b) False
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10. The purpose of name mangling is to avoid unintentional access of private class members. True or False?
a) True
b) False
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11. What is the output of the following code?

class fruits:
    def __init__(self):
        self.price = 100
        self.__bags = 5
    def display(self):
        print(self.__bags)
obj=fruits()
obj.display()

a) The program has an error because display() is trying to print a private class member
b) The program runs fine but nothing is printed
c) The program runs fine and 5 is printed
d) The program has an error because display() can’t be accessed
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12. What is the output of the following code?

 class student:
    def __init__(self):
        self.marks = 97
        self.__cgpa = 8.7
    def display(self):
        print(self.marks)
obj=student()
print(obj._student__cgpa)

a) The program runs fine and 8.7 is printed
b) Error because private class members can’t be accessed
c) Error because the proper syntax for name mangling hasn’t been implemented
d) The program runs fine but nothing is printed
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13. Which of the following is false about protected class members?
a) They begin with one underscore
b) They can be accessed by subclasses
c) They can be accessed by name mangling method
d) They can be accessed within a class
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14. What is the output of the following piece of code?

class objects:
    def __init__(self):
        self.colour = None
        self._shape = "Circle" 
 
    def display(self, s):
        self._shape = s
obj=objects()
print(obj._objects_shape)

a) The program runs fine because name mangling has been properly implemented
b) Error because the member shape is a protected member
c) Error because the proper syntax for name mangling hasn’t been implemented
d) Error because the member shape is a private member
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Sanfoundry Global Education & Learning Series – Python.

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