PCPP-32-101 1.6 Understand and Use Abstract Classes and Methods PCPP-32-1 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   What is the effect of overriding an abstract method in a subclass?

   • AThe subclass must also override all other methods in the parent class.
   • BThe abstract method is removed from the parent class.
   • CThe subclass becomes concrete and can be instantiated.
   • DThe parent class becomes concrete.
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2. 2application · medium

   A developer has an abstract class `Worker` with an abstract method `work()`. They create a subclass `Manager` that implements `work()`. However, they also want to create a subclass `Intern` that inherits from `Manager` and does not override `work()`. What is true about `Intern`?

   • A`Intern` must implement `work()` again because it is a new class.
   • B`Intern` is concrete because it inherits the implementation from `Manager`.
   • C`Intern` is abstract because it does not override `work()`.
   • D`Intern` will raise an error at instantiation because it does not override `work()`.
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4. 3expert · hard

   A developer is creating a class `Robot` that inherits from two abstract classes: `Mover` (with abstract method `move()`) and `Speaker` (with abstract method `speak()`). Both abstract classes have a concrete method `status()`. The developer wants `Robot` to use `Mover`'s `status()` implementation. What is the correct approach?

   • AUse `super()` in `Robot` to call both `status()` implementations.
   • BImplement `move()` and `speak()` in `Robot` and rely on MRO to resolve `status()`.
   • CImplement `status()` in `Robot` to avoid ambiguity.
   • DMake `Robot` abstract and do not implement `move()` or `speak()`.
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5. 4foundation · easy

   What is the primary benefit of deriving multiple concrete classes from a single abstract base class?

   • AIt makes the abstract base class instantiable.
   • BIt reduces the total number of classes in the program.
   • CIt allows each subclass to provide its own implementation of the abstract methods.
   • DIt automatically shares state between subclasses.
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6. 5foundation · easy

   What happens when you try to instantiate a class that contains an abstract method but does not implement it?

   • AThe abstract method is automatically implemented with a default body.
   • BThe class is instantiated, but the abstract method is skipped.
   • CA warning is issued, but the class is instantiated.
   • DA TypeError is raised.
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