Object-Oriented Programming for Data Modeling PCAD-31 Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   What is the primary purpose of defining a class in a data analytics project?

   • ATo define a function that processes a list of numbers.
   • BTo import external libraries for data manipulation.
   • CTo create a reusable blueprint for objects that represent data entities with attributes and behaviors.
   • DTo store data in a tabular format that can be queried with SQL.
   Reveal Solution Discussion Select an answer first
2. 17foundation · easy

   What is the difference between shallow copy and deep copy?

   • AShallow copy is only for immutable objects; deep copy is for mutable objects.
   • BShallow copy duplicates everything; deep copy shares nested objects.
   • CShallow copy duplicates the object but shares nested objects; deep copy recursively duplicates all nested objects.
   • DShallow copy is faster but less safe; deep copy is slower but always safe.
   Reveal Solution Discussion Select an answer first
4. 18foundation · easy

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

   • A__new__
   • B__str__
   • C__call__
   • D__init__
   Reveal Solution Discussion Select an answer first
5. 19foundation · easy

   What is the purpose of the `with` statement and context managers (e.g., `__enter__` and `__exit__`)?

   • ATo ensure resources are properly acquired and released, even if an error occurs
   • BTo make an object immutable
   • CTo automatically serialize an object to JSON
   • DTo create a new thread for concurrent execution
   Reveal Solution Discussion Select an answer first
6. 20foundation · easy

   What does a subclass inherit from its parent class?

   • ANothing; the subclass must redefine everything
   • BAll public attributes and methods, which can be overridden or extended
   • COnly the methods, not the attributes
   • DOnly the private attributes of the parent
   Reveal Solution Discussion Select an answer first