Hard Mobile App Development Test - 82+ MCQs: Mobile App Development test: Evaluate Your Skills with App Development Questions and Answers

1. Which method is called when an Android app is resumed from the background?

onResume

onStart

onRestart

onResumeFromBackground

2. What is the purpose of the 'AndroidManifest.xml' file?

To define the app's structure

To manage app permissions

To store user preferences

To handle database connections

3. What is the purpose of the 'useState' hook in React Native?

To handle app navigation

To store UI-related data

To perform asynchronous tasks

To manage app permissions

4. What is the purpose of the 'Swift Package Manager' in iOS app development?

To handle app navigation

To perform background tasks

To manage app resources

To manage dependencies and build processes

5. What is the purpose of the 'SharedPreferences' in Android app development?

To store user preferences

To manage app resources

To handle app navigation

To control the app's lifecycle

6. Which method is used for making API requests in React Native?

fetch()

axios()

http()

request()

7. What is the purpose of the 'Reactive Programming' paradigm in mobile app development?

To simplify user interfaces

To handle asynchronous events with observable sequences

To improve app security

To optimize database performance

8. What is the purpose of the 'NSUserDefaults' in iOS app development?

To manage app permissions

To store user preferences

To control the app's lifecycle

To handle background tasks

9. What is the purpose of the 'Core Data' framework in iOS app development?

To manage app resources

To store user preferences

To handle app permissions

To perform data persistence

10. What is the purpose of the 'AppDelegate.h' file in iOS app development?

To control the app's lifecycle

To handle background tasks

To define the app's layout

To manage app permissions

11. Which method is used for handling user authentication in Firebase for Android apps?

authUser()

authenticate()

signInUser()

signInWithEmailAndPassword()

12. What is the primary purpose of a manifest file in mobile app development?

To store user preferences

To manage app permissions

To define the app's structure

To control app navigation

13. In iOS app development, what is the purpose of the 'DispatchQueue'?

To manage app permissions

To handle user interactions

To perform background tasks concurrently

To define the app's layout

14. What is the purpose of a splash screen in mobile app development?

To display ads

To provide information about the app

To entertain users

To show a loading screen while the app initializes

15. Which permission is required for accessing the device's camera in a mobile app?

ACCESS_FINE_LOCATION

CAMERA

READ_PHONE_STATE

INTERNET

16. Which architecture pattern is commonly used in Flutter app development?

MVC (Model-View-Controller)

MVVM (Model-View-ViewModel)

Observer Pattern

Singleton Pattern

17. Which component is responsible for handling user interactions in a mobile app?

Activity

Service

BroadcastReceiver

ContentProvider

18. What does API stand for in the context of mobile app development?

Advanced Programming Interface

Application Programming Interface

Automated Program Integration

App Program Interface

19. In React Native app development, what is the purpose of the 'Hermes' engine?

To optimize UI rendering

To manage app resources

To perform background tasks

To enhance JavaScript execution

20. What is the purpose of the 'ViewModel' in Android app development?

To store UI-related data

To handle user interactions

To control the app's lifecycle

To define the app's layout

21. What is the purpose of the 'res' folder in Android app development?

To store app icons

To manage app permissions

To define the app's structure

To store app resources

22. What is the primary purpose of the 'SwiftUI' framework in iOS app development?

To handle app navigation

To perform animations

To design user interfaces with a declarative syntax

To optimize UI rendering

23. What is the purpose of the 'ContentResolver' in Android app development?

To manage app permissions

To handle background tasks

To perform database operations

To interact with content providers

24. Which design pattern is commonly used in iOS app development for managing the flow of data?

MVC (Model-View-Controller)

Observer Pattern

Singleton Pattern

Factory Method Pattern

25. Which file is used to specify app permissions in Android?

permissions.plist

permissions.xml

AndroidManifest.xml

app.permissions

26. Which database is commonly used for real-time synchronization in mobile app development?

Realm

SQLite

Firebase Realtime Database

Core Data

27. What is the purpose of the 'Jetpack Compose' framework in Android app development?

To manage app permissions

To design user interfaces with a declarative syntax

To perform background tasks

To handle navigation between screens

28. In mobile app development, what does SDK stand for?

Software Development Kit

System Development Kit

Security Development Kit

Scripting Development Kit

29. What role does the 'Apollo Client' play in React Native app development?

To handle app navigation

To manage app resources

To perform background tasks

To interact with GraphQL APIs

30. What is the purpose of the 'config.xml' file in a Cordova/PhoneGap project?

To configure app permissions

To define the app's structure

To store user credentials

To manage external libraries

31. In Flutter app development, what is the purpose of the 'Bloc' pattern?

To handle app navigation

To manage state and logic in a reactive way

To perform animations

To optimize UI rendering

32. What is the purpose of the 'Keychain' in iOS app development?

To manage app permissions

To store user credentials securely

To control the app's lifecycle

To handle background tasks

33. What is the purpose of the 'useEffect' hook in React Native?

To manage app resources

To perform asynchronous tasks

To handle app navigation

To store user preferences

34. Which programming language is commonly used for cross-platform mobile app development?

Java

Swift

Kotlin

Flutter

35. What role does the 'JNI (Java Native Interface)' play in Android app development?

To manage app permissions

To perform background tasks

To facilitate communication between Java and native code

To handle app navigation

36. Which file format is used for storing vector graphics in Android?

PNG

SVG

JPEG

GIF

37. In Android app development, what is the purpose of the 'LiveData' class?

To perform background tasks

To optimize UI rendering

To manage state and logic

To observe and react to data changes

38. Which programming language is commonly used for Android app development?

Swift

Java

Objective-C

Kotlin

39. Which technique is commonly used for optimizing memory usage in iOS app development?

Garbage Collection

Memory Leaks

Auto Layout

Manual Reference Counting

40. Which security measure is crucial for protecting data transmitted between a mobile app and a server?

Firebase Authentication

JWT (JSON Web Tokens)

SSL/TLS Encryption

OAuth 2.0

Mobile App Development MCQ Test 2