App Dev Day 1

Which of the following is not a principle of Object-Oriented Programming?

•  Encapsulation

• Inheritance

• Compilation

• Polymorphism

What is the main purpose of encapsulation in OOP?

• To allow multiple classes to inherit from one base class

• To define multiple functions with the same name

• To restrict access to certain details of an object

• To reuse the code of other classes

Which of the following allows a subclass to provide a specific implementation of a method already defined in its superclass?

•  Abstraction

• Inheritance

• Method Overloading

• Method Overriding

What does the term "polymorphism" mean in OOP?

• Using many functions to do one task

• One object behaving differently based on the context

• Writing code that is specific to one class

• None of the above

Which of the following best defines abstraction in OOP?

• Hiding internal implementation details and showing only functionality

•  Creating multiple classes with similar features

• Making all class members public

• None of the above

Which of these is a reserved keyword in Dart?

• value

• final

• define

• object

What is the output of the following code?

var name = "Alex";

name = "Sam";

print(name);

• Alex

• Sam

• Error

• null

What will the following function return?

int add(int a, int b) {

  return a + b;
}

• Nothing

• A String

• A number

• A list

What does the const keyword do in Dart?

• Declares a constant at runtime

• Declares a variable that can be changed later

• Declares a compile-time constant

• Declares a class

What is the correct way to define a function in Dart that returns nothing?

• void myFunction() {}

• null myFunction() {}

• function myFunction() {}

• def myFunction() {}