Quiz 7 Object Oriented Programming (Polymorphism, Abstract Classes and Interfaces)

What is polymorphism in Dart?

• A) The ability of a class to have multiple constructors
• B) The ability of a method to have different implementations in subclasses
• C) A way to prevent inheritance
• D) The ability to store multiple values in a variable

What is method overriding in Dart?

• A) A way to call a superclass method from a subclass
• B) When a subclass provides a new implementation of a method from the superclass
• C) Using multiple constructors in a class
• D) A method that calls itself

Which keyword is used to override a method in Dart?

• A) implements
• B) override
• C) extends
• D) final

Which of the following is NOT true about polymorphism?

• A) It allows a subclass to override methods of the superclass
• B) It makes the code more flexible and reusable
• C) It prevents subclasses from modifying the superclass methods
• D) It helps in achieving dynamic method dispatch

What is an abstract class in Dart?

• A) A class that cannot be instantiated and is used to define a blueprint for other classes
• B) A class that allows multiple inheritance
• C) A class that can be instantiated directly
• D) A class that only contains private variables

Which keyword is used to define an abstract class in Dart?

• A) class
• B) interface
• C) abstract
• D) implements

Which statement about abstract classes is true?

• A) Abstract classes must have at least one method implementation
• B) Abstract classes cannot have implemented methods
• C) You can create an object of an abstract class directly
• D) Abstract classes are used when we need partial implementation of functionality

How do you make a class implement an interface in Dart?

• A) Use the interface keyword
• B) Use the extends keyword
• C) Use the implements keyword
• D) Use the override keyword

What happens when a class implements an interface in Dart?

• A) It must provide implementations for all the methods defined in the interface
• B) It automatically inherits all methods from the interface
• C) It cannot have its own additional methods
• D) It can only implement one interface

What is the difference between abstract classes and interfaces in Dart?

• A) Abstract classes can have method implementations, but interfaces cannot
• B) Interfaces can have constructors, but abstract classes cannot
• C) Abstract classes cannot have method implementations
• D) Interfaces are only used for private methods