React Native Technology & Digital Applications 5

Question 1

Which React Native API allows you to schedule a task to run in the background even when the app is not in the foreground?

Accepted Answer

expo-background-fetch or react-native-background-fetch

Answer

Libraries like expo-background-fetch use native background task APIs on iOS and Android to run periodic background work.

Question 2

In React Native, how do you enable deep linking so the app opens to a specific screen from an external URL?

Accepted Answer

Configure a URL scheme in app.json/Info.plist/AndroidManifest and handle the URL in a Linking event listener or React Navigation's linking config

Answer

Deep linking requires registering a URL scheme natively and then parsing incoming URLs—typically via React Navigation's linking prop or the Linking API.

Question 3

What is the recommended way to securely store sensitive data like API tokens in a React Native app?

Accepted Answer

expo-secure-store or react-native-keychain, which use the OS keystore/keychain

Answer

expo-secure-store and react-native-keychain store secrets in iOS Keychain or Android Keystore, which are hardware-backed secure enclaves.

Question 4

Which React Native prop on Image controls how an image is scaled within its container?

Accepted Answer

resizeMode

Answer

The resizeMode prop accepts 'cover', 'contain', 'stretch', 'repeat', or 'center' to control how the image fills its bounds.

Question 5

What is the purpose of `react-native-gesture-handler` in a React Native project?

Accepted Answer

It processes touch gestures on the UI thread for lower latency and better composability than the built-in touch system

Answer

react-native-gesture-handler moves gesture recognition to the native UI thread, avoiding the JS bridge overhead that causes dropped frames during fast swipes.

React Native Practice Test

React Native Practice Test

React Native Technology & Digital Applications 5