Practice Python OOP Design MCQ questions with detailed explanations and clear answer validation. These MCQs help you revise core concepts, compare close options, and improve accuracy for interviews, certification exams, and technical screening rounds. Use this updated 2026 set to strengthen fundamentals and confidence.
Q51. Which statement about multiple inheritance is most accurate?
Select an answer to check.
Answer: Class with more than one base.
Here, Class with more than one base. is the right choice. Use sparingly with MRO awareness. It aligns directly with what the question asks about which statement about multiple inheritance is most accurate. Competing choices sound plausible, but they miss the key condition.
Q52. How is multiple inheritance best characterized?
Select an answer to check.
Answer: Class with more than one base.
In this case, Class with more than one base. is correct. Use sparingly with MRO awareness. It aligns directly with what the question asks about how is multiple inheritance best characterized. Competing choices sound plausible, but they miss the key condition.
Q53. Which option best describes a mixin in Python?
Select an answer to check.
Answer: A class providing reusable methods to combine.
The best option here is A class providing reusable methods to combine.. Often suffix Mixin. It aligns directly with what the question asks about which option best describes a mixin in python. Competing choices sound plausible, but they miss the key condition.
Q54. What is the primary purpose of a mixin?
Select an answer to check.
Answer: A class providing reusable methods to combine.
For this question, A class providing reusable methods to combine. is correct. Often suffix Mixin. It aligns directly with what the question asks about what is the primary purpose of a mixin. Competing choices sound plausible, but they miss the key condition.
Q55. Which statement about a mixin is most accurate?
Select an answer to check.
Answer: A class providing reusable methods to combine.
A class providing reusable methods to combine. is the correct answer here. Often suffix Mixin. It aligns directly with what the question asks about which statement about a mixin is most accurate. Competing choices sound plausible, but they miss the key condition.
Q56. How is a mixin best characterized?
Select an answer to check.
Answer: A class providing reusable methods to combine.
Here, A class providing reusable methods to combine. is the right choice. Often suffix Mixin. This matches the core idea being tested around how is a mixin best characterized. Competing choices sound plausible, but they miss the key condition.
Q57. Which option best describes ABC (abc module) in Python?
Select an answer to check.
Answer: Abstract base classes with @abstractmethod.
In this case, Abstract base classes with @abstractmethod. is correct. Cannot instantiate directly. This matches the core idea being tested around which option best describes abc (abc module) in. Competing choices sound plausible, but they miss the key condition.
Q58. What is the primary purpose of ABC (abc module)?
Select an answer to check.
Answer: Abstract base classes with @abstractmethod.
The best option here is Abstract base classes with @abstractmethod.. Cannot instantiate directly. This matches the core idea being tested around what is the primary purpose of abc (abc. Competing choices sound plausible, but they miss the key condition.
Q59. Which statement about ABC (abc module) is most accurate?
Select an answer to check.
Answer: Abstract base classes with @abstractmethod.
For this question, Abstract base classes with @abstractmethod. is correct. Cannot instantiate directly. This matches the core idea being tested around which statement about abc (abc module) is most. Competing choices sound plausible, but they miss the key condition.
Q60. How is ABC (abc module) best characterized?
Select an answer to check.
Answer: Abstract base classes with @abstractmethod.
Abstract base classes with @abstractmethod. is the correct answer here. Cannot instantiate directly. This matches the core idea being tested around how is abc (abc module) best characterized. Competing choices sound plausible, but they miss the key condition.
Q61. Which option best describes @abstractmethod in Python?
Select an answer to check.
Answer: Forces subclass to implement.
Here, Forces subclass to implement. is the right choice. Used in ABCs. That is exactly the concept behind which option best describes @abstractmethod in python in this context. Competing choices sound plausible, but they miss the key condition.
Q62. What is the primary purpose of @abstractmethod?
Select an answer to check.
Answer: Forces subclass to implement.
In this case, Forces subclass to implement. is correct. Used in ABCs. That is exactly the concept behind what is the primary purpose of @abstractmethod in this context. Competing choices sound plausible, but they miss the key condition.
Q63. Which statement about @abstractmethod is most accurate?
Select an answer to check.
Answer: Forces subclass to implement.
The best option here is Forces subclass to implement.. Used in ABCs. That is exactly the concept behind which statement about @abstractmethod is most accurate in this context. Competing choices sound plausible, but they miss the key condition.
Q64. How is @abstractmethod best characterized?
Select an answer to check.
Answer: Forces subclass to implement.
For this question, Forces subclass to implement. is correct. Used in ABCs. That is exactly the concept behind how is @abstractmethod best characterized in this context. Competing choices sound plausible, but they miss the key condition.
Q65. Which option best describes typing.Protocol in Python?
Select an answer to check.
Answer: Structural typing (duck typing) via static checks.
Structural typing (duck typing) via static checks. is the correct answer here. Type checking by interface. That is exactly the concept behind which option best describes typing.protocol in python in this context. Competing choices sound plausible, but they miss the key condition.
Q66. What is the primary purpose of typing.Protocol?
Select an answer to check.
Answer: Structural typing (duck typing) via static checks.
Here, Structural typing (duck typing) via static checks. is the right choice. Type checking by interface. It fits the requirement in the prompt about what is the primary purpose of typing.protocol. Competing choices sound plausible, but they miss the key condition.
Q67. Which statement about typing.Protocol is most accurate?
Select an answer to check.
Answer: Structural typing (duck typing) via static checks.
In this case, Structural typing (duck typing) via static checks. is correct. Type checking by interface. It fits the requirement in the prompt about which statement about typing.protocol is most accurate. Competing choices sound plausible, but they miss the key condition.
Q68. How is typing.Protocol best characterized?
Select an answer to check.
Answer: Structural typing (duck typing) via static checks.
The best option here is Structural typing (duck typing) via static checks.. Type checking by interface. It fits the requirement in the prompt about how is typing.protocol best characterized. Competing choices sound plausible, but they miss the key condition.
Q69. Which option best describes composition over inheritance in Python?
Select an answer to check.
Answer: Prefer 'has-a' to 'is-a' relationships.
For this question, Prefer 'has-a' to 'is-a' relationships. is correct. Reduces coupling. It fits the requirement in the prompt about which option best describes composition over inheritance in. Competing choices sound plausible, but they miss the key condition.
Q70. What is the primary purpose of composition over inheritance?
Select an answer to check.
Answer: Prefer 'has-a' to 'is-a' relationships.
Prefer 'has-a' to 'is-a' relationships. is the correct answer here. Reduces coupling. It fits the requirement in the prompt about what is the primary purpose of composition over. Competing choices sound plausible, but they miss the key condition.
Q71. Which statement about composition over inheritance is most accurate?
Select an answer to check.
Answer: Prefer 'has-a' to 'is-a' relationships.
Here, Prefer 'has-a' to 'is-a' relationships. is the right choice. Reduces coupling. This is the most accurate statement for which statement about composition over inheritance is most. Competing choices sound plausible, but they miss the key condition.
Q72. How is composition over inheritance best characterized?
Select an answer to check.
Answer: Prefer 'has-a' to 'is-a' relationships.
In this case, Prefer 'has-a' to 'is-a' relationships. is correct. Reduces coupling. This is the most accurate statement for how is composition over inheritance best characterized. Competing choices sound plausible, but they miss the key condition.
Q73. Which option best describes encapsulation in Python?
Select an answer to check.
Answer: Hide internal state behind methods/properties.
The best option here is Hide internal state behind methods/properties.. Use _ prefix and properties. This is the most accurate statement for which option best describes encapsulation in python. Competing choices sound plausible, but they miss the key condition.
Q74. What is the primary purpose of encapsulation?
Select an answer to check.
Answer: Hide internal state behind methods/properties.
For this question, Hide internal state behind methods/properties. is correct. Use _ prefix and properties. This is the most accurate statement for what is the primary purpose of encapsulation. Competing choices sound plausible, but they miss the key condition.
Q75. Which statement about encapsulation is most accurate?
Select an answer to check.
Answer: Hide internal state behind methods/properties.
Hide internal state behind methods/properties. is the correct answer here. Use _ prefix and properties. This is the most accurate statement for which statement about encapsulation is most accurate. Competing choices sound plausible, but they miss the key condition.
Q76. How is encapsulation best characterized?
Select an answer to check.
Answer: Hide internal state behind methods/properties.
Here, Hide internal state behind methods/properties. is the right choice. Use _ prefix and properties. It aligns directly with what the question asks about how is encapsulation best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q77. Which option best describes name mangling in Python?
Select an answer to check.
Answer: __name on a class becomes _ClassName__name.
In this case, __name on a class becomes _ClassName__name. is correct. Avoid name collisions in subclasses. It aligns directly with what the question asks about which option best describes name mangling in python. The remaining choices fail because they don’t satisfy the full definition.
Q78. What is the primary purpose of name mangling?
Select an answer to check.
Answer: __name on a class becomes _ClassName__name.
The best option here is __name on a class becomes _ClassName__name.. Avoid name collisions in subclasses. It aligns directly with what the question asks about what is the primary purpose of name mangling. The remaining choices fail because they don’t satisfy the full definition.
Q79. Which statement about name mangling is most accurate?
Select an answer to check.
Answer: __name on a class becomes _ClassName__name.
For this question, __name on a class becomes _ClassName__name. is correct. Avoid name collisions in subclasses. It aligns directly with what the question asks about which statement about name mangling is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q80. How is name mangling best characterized?
Select an answer to check.
Answer: __name on a class becomes _ClassName__name.
__name on a class becomes _ClassName__name. is the correct answer here. Avoid name collisions in subclasses. It aligns directly with what the question asks about how is name mangling best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q81. Which option best describes descriptors in Python?
Select an answer to check.
Answer: Objects implementing __get__/__set__ to govern attribute access.
Here, Objects implementing __get__/__set__ to govern attribute access. is the right choice. Underpin properties. This matches the core idea being tested around which option best describes descriptors in python. The remaining choices fail because they don’t satisfy the full definition.
Q82. What is the primary purpose of descriptors?
Select an answer to check.
Answer: Objects implementing __get__/__set__ to govern attribute access.
In this case, Objects implementing __get__/__set__ to govern attribute access. is correct. Underpin properties. This matches the core idea being tested around what is the primary purpose of descriptors. The remaining choices fail because they don’t satisfy the full definition.
Q83. Which statement about descriptors is most accurate?
Select an answer to check.
Answer: Objects implementing __get__/__set__ to govern attribute access.
The best option here is Objects implementing __get__/__set__ to govern attribute access.. Underpin properties. This matches the core idea being tested around which statement about descriptors is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q84. How is descriptors best characterized?
Select an answer to check.
Answer: Objects implementing __get__/__set__ to govern attribute access.
For this question, Objects implementing __get__/__set__ to govern attribute access. is correct. Underpin properties. This matches the core idea being tested around how is descriptors best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q85. Which option best describes __slots__ in Python?
Select an answer to check.
Answer: Restricts attributes to a fixed list, saving memory.
Restricts attributes to a fixed list, saving memory. is the correct answer here. No __dict__ on instances. This matches the core idea being tested around which option best describes __slots__ in python. The remaining choices fail because they don’t satisfy the full definition.
Q86. What is the primary purpose of __slots__?
Select an answer to check.
Answer: Restricts attributes to a fixed list, saving memory.
Here, Restricts attributes to a fixed list, saving memory. is the right choice. No __dict__ on instances. That is exactly the concept behind what is the primary purpose of __slots__ in this context. The remaining choices fail because they don’t satisfy the full definition.
Q87. Which statement about __slots__ is most accurate?
Select an answer to check.
Answer: Restricts attributes to a fixed list, saving memory.
In this case, Restricts attributes to a fixed list, saving memory. is correct. No __dict__ on instances. That is exactly the concept behind which statement about __slots__ is most accurate in this context. The remaining choices fail because they don’t satisfy the full definition.
Q88. How is __slots__ best characterized?
Select an answer to check.
Answer: Restricts attributes to a fixed list, saving memory.
The best option here is Restricts attributes to a fixed list, saving memory.. No __dict__ on instances. That is exactly the concept behind how is __slots__ best characterized in this context. The remaining choices fail because they don’t satisfy the full definition.
Q89. Which option best describes __eq__/__hash__ in Python?
Select an answer to check.
Answer: Define equality and hash for instances.
For this question, Define equality and hash for instances. is correct. Override carefully together. That is exactly the concept behind which option best describes __eq__/__hash__ in python in this context. The remaining choices fail because they don’t satisfy the full definition.
Q90. What is the primary purpose of __eq__/__hash__?
Select an answer to check.
Answer: Define equality and hash for instances.
Define equality and hash for instances. is the correct answer here. Override carefully together. That is exactly the concept behind what is the primary purpose of __eq__/__hash__ in this context. The remaining choices fail because they don’t satisfy the full definition.
Q91. Which statement about __eq__/__hash__ is most accurate?
Select an answer to check.
Answer: Define equality and hash for instances.
Here, Define equality and hash for instances. is the right choice. Override carefully together. It fits the requirement in the prompt about which statement about __eq__/__hash__ is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q92. How is __eq__/__hash__ best characterized?
Select an answer to check.
Answer: Define equality and hash for instances.
In this case, Define equality and hash for instances. is correct. Override carefully together. It fits the requirement in the prompt about how is __eq__/__hash__ best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q93. Which option best describes dataclasses in Python?
Select an answer to check.
Answer: Auto-generated boilerplate for value classes.
The best option here is Auto-generated boilerplate for value classes.. Use frozen=True for immutability. It fits the requirement in the prompt about which option best describes dataclasses in python. The remaining choices fail because they don’t satisfy the full definition.
Q94. What is the primary purpose of dataclasses?
Select an answer to check.
Answer: Auto-generated boilerplate for value classes.
For this question, Auto-generated boilerplate for value classes. is correct. Use frozen=True for immutability. It fits the requirement in the prompt about what is the primary purpose of dataclasses. The remaining choices fail because they don’t satisfy the full definition.
Q95. Which statement about dataclasses is most accurate?
Select an answer to check.
Answer: Auto-generated boilerplate for value classes.
Auto-generated boilerplate for value classes. is the correct answer here. Use frozen=True for immutability. It fits the requirement in the prompt about which statement about dataclasses is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q96. How is dataclasses best characterized?
Select an answer to check.
Answer: Auto-generated boilerplate for value classes.
Here, Auto-generated boilerplate for value classes. is the right choice. Use frozen=True for immutability. This is the most accurate statement for how is dataclasses best characterized. The remaining choices fail because they don’t satisfy the full definition.
Q97. Which option best describes metaclass in Python?
Select an answer to check.
Answer: The class of a class; controls class creation.
In this case, The class of a class; controls class creation. is correct. Default is type. This is the most accurate statement for which option best describes metaclass in python. The remaining choices fail because they don’t satisfy the full definition.
Q98. What is the primary purpose of metaclass?
Select an answer to check.
Answer: The class of a class; controls class creation.
The best option here is The class of a class; controls class creation.. Default is type. This is the most accurate statement for what is the primary purpose of metaclass. The remaining choices fail because they don’t satisfy the full definition.
Q99. Which statement about metaclass is most accurate?
Select an answer to check.
Answer: The class of a class; controls class creation.
For this question, The class of a class; controls class creation. is correct. Default is type. This is the most accurate statement for which statement about metaclass is most accurate. The remaining choices fail because they don’t satisfy the full definition.
Q100. How is metaclass best characterized?
Select an answer to check.
Answer: The class of a class; controls class creation.
The class of a class; controls class creation. is the correct answer here. Default is type. This is the most accurate statement for how is metaclass best characterized. The remaining choices fail because they don’t satisfy the full definition.