Python Quiz-5

1. Which of the following best describes inheritance?

• Ability of a class to derive members of another class as a part of its own definition

• Means of bundling instance variables and methods in order to restrict access to certain class members

• Focuses on variables and passing of variables to functions

• Allows for implementation of elegant software that is well designed and easily modified

Which of the following statements is wrong about inheritance?

• Protected members of a class can be inherited

• The inheriting class is called a subclass

• Private members of a class can be inherited and accessed

• Inheritance is one of the features of OOP

class A():

def disp(self):

print("A disp()")

class B(A):

pass

obj = B()

obj.disp()

• Invalid syntax for inheritance

• Error because when object is created, argument must be passed

• Nothing is printed

• A disp()

All subclasses are a subtype in object-oriented programming.

• True

• False

Which of the following is not a type of inheritance?

• Double

• Single

• Multiple

• Multilevel

What type of inheritance is illustrated in the following Python code?

class A():

pass

class B():

pass

class C(A,B):

pass

• Multilevel

• Single

• Multiple

• Hybrid

What type of inheritance is illustrated in the following Python code?

class A():

pass

class B(A):

pass

class C(B):

pass

• Multilevel

• Multiple

• Single

• Hybrid

What does single-level inheritance mean?

• A subclass derives from a class which in turn derives from another class

• A single superclass inherits from multiple subclasses

• A single subclass derives from a single superclass

• Multiple base classes inherit a single derived class

What will be the output of the following Python code?

class A:

pass

class B(A):

pass

obj=B()

isinstance(obj,A)

• Wrong syntax for isinstance() method

• Invalid method for classes

• True

• False

What will be the output of the following Python code?

class A:

def __init__(self):

self.__x = 1

class B(A):

def display(self):

print(self.__x)

def main():

obj = B()

obj.display()

• Error, private class member can’t be accessed in a subclass

• 0

• Error, invalid syntax for object declaration

• 1