PCAP-31-03 4.6 Construct and Initialize Objects PCAP-31 Practice Questions (Page 3)

Questions 11–15

1. 11application · medium

   A logistics company needs to model each delivery truck with a unique ID and a starting fuel level. The fleet manager wants to create truck objects by passing these two values when the object is created. Which class definition best meets this requirement?

   • Aclass Truck: def __init__(truck_id, fuel): self.truck_id = truck_id; self.fuel = fuel
   • Bclass Truck: def __init__(self): self.truck_id = None; self.fuel = 0
   • Cclass Truck: def __init__(self, truck_id, fuel): self.truck_id = truck_id; self.fuel = fuel
   • Dclass Truck: def __init__(self, fuel, truck_id): self.fuel = fuel; self.truck_id = truck_id
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2. 12application · easy

   A developer is writing code to create a new student object. The Student class has an __init__ method that requires a name and a grade. Which line of code correctly creates a Student object with name 'Bob' and grade 9?

   • Astudent = Student()
   • Bstudent = Student(name='Bob', grade=9)
   • Cstudent = Student('Bob', 9)
   • Dstudent = Student.__init__('Bob', 9)
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4. 13application · medium

   A developer is implementing a class to represent a movie. The __init__ method should set the title and year as instance attributes. Which code snippet correctly binds these attributes to the instance?

   • Aclass Movie: def __init__(self, title, year): Movie.title = title; Movie.year = year
   • Bclass Movie: def __init__(self, title, year): self.title = title; self.year = year
   • Cclass Movie: def __init__(title, year): self.title = title; self.year = year
   • Dclass Movie: def __init__(self, title, year): title = title; year = year
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5. 14application · easy

   A developer defines a class called Config with no __init__ method. They then create an instance with config = Config(). What is the result?

   • AThe instance is created, but it automatically gets a settings attribute.
   • BAn error occurs because a class must have an __init__ method.
   • CThe instance is created, but it cannot be used until __init__ is called manually.
   • DThe instance is created successfully, and it has no instance attributes.
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6. 15expert · hard

   A developer is maintaining a class hierarchy where a base class has no __init__ and a subclass defines __init__ with optional parameters. The developer wants to ensure that creating a subclass instance without arguments still works, and that the base class is properly initialized. What is the best approach?

   • ADo not define __init__ in the subclass; rely on the default constructor.
   • BDefine __init__ in the base class with default values and do not define __init__ in the subclass.
   • CDefine __init__ in the subclass with required parameters only.
   • DDefine __init__ in the subclass with default values for all parameters and call super().__init__() if the base class has an __init__.
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