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IB Computer Science HL Mastery Hub: The Industry Foundation

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Q1Domain Verified
Considering the principles of Object-Oriented Programming (OOP) as presented in "The Complete IB CS HL OOP & DSA Course 2026," which of the following scenarios best exemplifies the concept of polymorphism?
A `DatabaseConnection` class with a `connect()` method that is implemented differently for SQL and NoSQL databases.
A `FileHandler` class that provides methods for reading and writing to different file types (e.g., `.txt`, `.csv`, `.json`).
A `Shape` abstract class with a `draw()` method, and concrete subclasses like `Circle`, `Square`, and `Triangle`, each implementing its own `draw()` method.
A `Car` class inheriting from a `Vehicle` class, where `Car` overrides the `startEngine()` method to include specific car ignition logic.
Q2Domain Verified
In the context of Data Structures and Algorithms (DS
Hash tables offer average O(1) time complexity for search, insertion, and deletion, which is generally faster than the O(log n) complexity of binary search in a sorted array.
Hash tables provide guaranteed O(1) time complexity for all operations, whereas sorted arrays have O(n) for insertion and deletion.
Hash tables require less memory overhead compared to sorted arrays, making them more space-efficient.
as covered in "The Complete IB CS HL OOP & DSA Course 2026," what is the primary advantage of using a hash table (or hash map) over a sorted array for implementing a dictionary or associative array, assuming average-case performance? A) Hash tables offer O(log n) time complexity for search, insertion, and deletion, while sorted arrays offer O(n).
Q3Domain Verified
According to the principles of encapsulation in OOP discussed in "The Complete IB CS HL OOP & DSA Course 2026," which of the following statements is most accurate regarding the protection of an object's internal state?
Encapsulation involves bundling data (attributes) and methods that operate on that data within a single unit (class) and controlling access to the data through public methods.
Encapsulation primarily focuses on achieving polymorphism by allowing objects of different classes to be treated as objects of a common superclass.
Encapsulation is a design pattern that promotes the use of abstract classes to hide implementation details from subclasses.
Encapsulation ensures that all data members of a class are publicly accessible, allowing for direct manipulation by external code.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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This domain protocol is rigorously covered in our 2026 Elite Framework. Every mock reflects direct alignment with the official assessment criteria to eliminate performance gaps.

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