dart and flutter 837

Question 1

What is the main difference between Firestore and Realtime Database?

Accepted Answer

Firestore is document-oriented, Realtime Database is JSON

Question 2

What does the ?? operator do in Dart?

Accepted Answer

Null coalescing

Question 3

Which widget is used to create a button in Flutter?

Accepted Answer

RaisedButton

Question 4

How do you run a Flutter app on an emulator?

Accepted Answer

Use flutter run command

Question 5

Which keyword is used to declare a variable that cannot change after initialization?

Accepted Answer

final

Question 6

Which widget is used to display a material design dialog?

Accepted Answer

All of the above

Question 7

Which keyword is used to define a class in Dart?

Accepted Answer

class

Question 8

Which widget is used to display an image in Flutter?

Accepted Answer

Image

Question 9

How do you define a list in Dart?

Accepted Answer

var myList = [1, 2, 3];

Question 10

How do you define an asynchronous function in Dart?

Accepted Answer

async function

Question 11

What is Dart primarily used for?

Accepted Answer

Both Red and Blue

Question 12

How do you authenticate users with email/password in Firebase?

Accepted Answer

FirebaseAuth.instance.signInWithEmailAndPassword()

Question 13

What is Flutter's primary programming language?

Accepted Answer

Dart

Question 14

What is the use of const constructors in Flutter?

Accepted Answer

To improve performance by creating compile-time constants

Question 15

Which widget is used to align its child widget to the center?

Accepted Answer

Center

Question 16

How do you make a widget responsive to different screen sizes in Flutter?

Accepted Answer

Use LayoutBuilder or MediaQuery

Question 17

Which operator is used for string interpolation in Dart?

Accepted Answer

$

Question 18

What is the purpose of the pubspec.yaml file?

Accepted Answer

To manage dependencies and assets

Question 19

What is the purpose of the setState() method in Flutter?

Accepted Answer

To update the UI with new state

Question 20

Which widget would you use to add space between other widgets?

Accepted Answer

All of the above

Question 21

Which Firebase service is used for realtime database functionality?

Accepted Answer

Realtime Database

Question 22

How do you define a custom widget in Flutter?

Accepted Answer

By extending StatelessWidget or StatefulWidget

Question 23

Which method is used to navigate to a new screen in Flutter?

Accepted Answer

Navigator.push()

Question 24

Which widget is used to create a scrollable list in Flutter?

Accepted Answer

ListView

Question 25

Which Flutter widget is used for creating a scrollable list?

Accepted Answer

ListView

Question 26

Which package is needed to use Firebase in Flutter?

Accepted Answer

All of the above

Question 27

What is the default layout widget in Flutter?

Accepted Answer

Scaffold

Question 28

What does the GestureDetector widget do in Flutter?

Accepted Answer

Detects user gestures and responds accordingly

Question 29

How can you apply padding to a widget in Flutter?

Accepted Answer

Use Padding widget

Question 30

What is the main building block of Flutter UIs?

Accepted Answer

Widgets

Question 31

Which data type is used for decimal numbers in Dart?

Accepted Answer

double

Question 32

How can you update the UI in a StatefulWidget?

Accepted Answer

By calling setState()

Question 33

What does the Expanded widget do in a Column or Row?

Accepted Answer

Expands to fill remaining space

Question 34

How do you declare a variable that can be changed?

Accepted Answer

var

Question 35

How do you define a stateful widget in Flutter?

Accepted Answer

class MyWidget extends StatefulWidget

Question 36

What is the output of the following code? print(2 + 3 * 4);

Accepted Answer

14

Question 37

How do you make a class immutable in Dart?

Accepted Answer

Use final for all fields

Question 38

What is the role of pubspec.yaml in a Flutter project?

Accepted Answer

Manages dependencies

Question 39

What is the correct syntax to define a function in Dart?

Accepted Answer

void myFunc() {}

Question 40

How do you specify the theme of a Flutter app?

Accepted Answer

In main.dart using ThemeData

Question 41

What is the purpose of the Context object in Flutter?

Accepted Answer

To provide the current location in the widget tree

Question 42

Which widget is used to create a multi-line text input field?

Accepted Answer

TextField

Question 43

What is the correct way to initialize Firebase in a Flutter app?

Accepted Answer

await Firebase.initializeApp()

Question 44

What is the purpose of the build method in a StatefulWidget?

Accepted Answer

To rebuild the widget tree

Question 45

Which widget allows you to place widgets in a horizontal line?

Accepted Answer

Row

Question 46

How do you handle exceptions in Dart?

Accepted Answer

try and catch

Question 47

What is Firebase Cloud Functions used for?

Accepted Answer

Running backend code in response to events

Question 48

How do you add a dependency to a Flutter project?

Accepted Answer

Add it to pubspec.yaml file

Question 49

What does the Navigator.pop() method do?

Accepted Answer

Removes the current screen from the navigation stack

Question 50

Which keyword is used to create a named constructor in Dart?

Accepted Answer

this

dart and flutter 837

Questions 50

dart and flutter 837

Questions 50