Flutter Quiz

What is the purpose of the async keyword in Dart?

• To define a synchronous function

• To indicate that a function returns a Future and can perform asynchronous operations

• To create a new thread

• To pause the execution of a function

In Flutter, what is the role of the BuildContext parameter in the build method?

• It defines the layout of the widget

• It provides information about the widget’s location in the widget tree

• It stores the state of the widget

• It handles navigation between screens

Which of the following is true about Future in Dart?

• It represents a value that is available immediately

• It can only return String values

• It is used to define synchronous operations

• It is a class that represents a potential value or error that will be available in the future

What widget should you use to manage a list of items that can grow dynamically in Flutter?

• Column

• Row

• ListView

• Stack

In Dart, what is the difference between final and const?

• final is immutable at compile-time, while const is mutable

• final can be set once at runtime, while const is a compile-time constant

• const can be reassigned, while final cannot

• There is no difference; they are interchangeable

How do you handle user input in a Flutter TextField?

• By using a TextEditingController

• By using the onTap property

• By wrapping it in a GestureDetector

• By setting the readOnly property to true

Which of the following is the correct way to navigate to a new screen in Flutter?

• Navigator.go(NewScreen())

• Route.push(NewScreen())

• Navigator.push(context, MaterialPageRoute(builder: (context) => NewScreen()))

• context.navigate(NewScreen())

What happens when you use the await keyword in an async function in Dart?

• It pauses execution until the Future completes, then resumes with the result

• It immediately returns a Future without waiting

• It throws an exception if the Future fails

• It skips the asynchronous operation entirely

What is the difference between StatelessWidget and StatefulWidget in Flutter?

• StatelessWidget can change its properties, while StatefulWidget cannot

• StatefulWidget maintains immutable state, while StatelessWidget is mutable

• StatefulWidget maintains mutable state, while StatelessWidget is immutable

• StatefulWidget is used only for animations, while StatelessWidget is for static UI

What does the setState() method do in Flutter?

• Initializes a widget

• Defines a new route

• Creates a new instance of a class

• Updates the UI by rebuilding the widget