Flutter Basics guide featuring essential interview questions and answers, designed to help beginners and professionals excel in Flutter training and coding interviews. At Softloom IT Training, we empower you with the knowledge and skills to master Flutter programming and succeed in the tech world.
1. What is Flutter?
A) A programming language
B) A framework for mobile and web development
C) A database management system
D) A cloud service
Answer: B) A framework for mobile and web development
2. Who developed Flutter?
A) Facebook
B) Apple
C) Google
D) Microsoft
Answer: C) Google
3. What programming language does Flutter use?
A) Java
B) Swift
C) Dart
D) Kotlin
Answer: C) Dart
4. What is the command to create a new Flutter project?
A) flutter create my_app
B) flutter new my_app
C) flutter start my_app
D) flutter init my_app
Answer: A) flutter create my_app
5. Which widget is used as a root widget in a Flutter app?
A) MaterialApp
B) Container
C) Column
D) Stack
Answer: A) MaterialApp
6. What is the main advantage of Flutter?
A) Uses multiple programming languages
B) Single codebase for multiple platforms
C) No need for internet connectivity
D) No UI customization required
Answer: B) Single codebase for multiple platforms
7. Which of the following is NOT a type of widget in Flutter?
A) StatefulWidget
B) StatelessWidget
C) AnimatedWidget
D) DynamicWidget
Answer: D) DynamicWidget
8. How do you add a package dependency in a Flutter project?
A) Modify flutter_config.yaml
B) Edit pubspec.yaml
C) Use flutter install command
D) Add to flutter_packages.json
Answer: B) Edit pubspec.yaml
9. What does the setState() method do in Flutter?
A) Deletes a widget
B) Updates the UI by changing the widget’s state
C) Restarts the entire application
D) Stops all animations
Answer: B) Updates the UI by changing the widget’s state
10. What command is used to run a Flutter app on an emulator?
A) flutter run
B) flutter start
C) flutter execute
D) flutter build
Answer: A) flutter run
11. Which of these widgets allows you to create a scrollable list?
A) Row
B) Column
C) ListView
D) Stack
Answer: C) ListView
12. What does the hot reload feature in Flutter do?
A) Stops the app and restarts it
B) Rebuilds the UI instantly without losing state
C) Clears the application cache
D) Only works on Android devices
Answer: B) Rebuilds the UI instantly without losing state
13. Which widget is used for displaying an image in Flutter?
A) ImageView
B) Image
C) Picture
D) Img
Answer: B) Image
14. How do you navigate to a new screen in Flutter?
A) Navigator.push(context, MaterialPageRoute(builder: (context) => NewScreen()))
B) context.push(NewScreen())
C) NewScreen.open(context)
D) Navigate.to(NewScreen())
Answer: A) Navigator.push(context, MaterialPageRoute(builder: (context) => NewScreen()))
15. Which widget allows you to arrange items in a grid format?
A) ListView
B) GridView
C) Column
D) Stack
Answer: B) GridView
16. What is the purpose of the Scaffold widget in Flutter?
A) It creates a basic app layout structure
B) It manages user authentication
C) It is used for navigation
D) It is used only in iOS apps
Answer: A) It creates a basic app layout structure
17. What does the pub get command do?
A) Fetches dependencies for the project
B) Runs unit tests
C) Clears the Flutter cache
D) Builds the APK
Answer: A) Fetches dependencies for the project
18. What is StatefulWidget used for?
A) For static UI components
B) For components that need to change dynamically
C) For defining animations
D) For handling navigation
Answer: B) For components that need to change dynamically
19. What is Future in Dart?
A) A data type for storing past values
B) A class for handling asynchronous operations
C) A built-in Flutter widget
D) A function that runs instantly
Answer: B) A class for handling asynchronous operations
20. What is a Stream in Dart?
A) A continuous flow of data
B) A static list of values
C) A Flutter widget
D) A debugging tool
Answer: A) A continuous flow of data
21. Which Flutter package is commonly used for state management?
A) Provider
B) Navigator
C) Router
D) StackManager
Answer: A) Provider
22. What does async keyword indicate in Dart?
A) That the function returns immediately
B) That the function contains asynchronous code
C) That the function only runs on Android
D) That the function is deprecated
Answer: B) That the function contains asynchronous code
23. Which function is used to handle errors in a Future?
A) try-catch
B) errorHandler()
C) onError()
D) catchError()
Answer: D) catchError()
24. How do you define a constant in Dart?
A) final x = 10;
B) const x = 10;
C) Both A & B
D) None of the above
Answer: C) Both A & B
25. What is the default build system for Flutter?
A) Gradle
B) Xcode
C) Maven
D) CocoaPods
Answer: A) Gradle
26. What is Bloc used for in Flutter?
A) A state management approach
B) A UI rendering engine
C) A database management system
D) A widget for handling gestures
Answer: A) A state management approach
27. What is the purpose of GestureDetector in Flutter?
A) To detect user interactions like taps and swipes
B) To display animations
C) To fetch data from an API
D) To control device sensors
Answer: A) To detect user interactions like taps and swipes
28. How do you define a function in Dart?
A) void myFunction() {}
B) def myFunction() {}
C) function myFunction() {}
D) new myFunction() {}
Answer: A) void myFunction() {}
29. What is the purpose of build() method in Flutter?
A) It builds the UI for a widget
B) It initializes state variables
C) It runs the main application logic
D) It compiles the Flutter project
Answer: A) It builds the UI for a widget
30. What is the main entry point function in a Flutter application?
A) main()
B) startApp()
C) flutterMain()
D) run()
Answer: A) main()
