50 IBM Mobile Application Development Practice Questions: Question Bank 2025

A mobile app must support offline usage and later synchronize changes when connectivity returns. Which architecture approach best fits this requirement?

A team is building a cross-platform app and wants to maximize code reuse while still accessing device features like camera and GPS. Which approach is most appropriate?

During testing, users report that the app UI freezes when loading data from a remote API. Which change is the best first step to address this issue?

An organization needs to distribute a mobile app internally to employees without making it publicly searchable. What is the most appropriate distribution strategy?

A development team wants to reduce coupling and improve testability in a mobile app by separating UI concerns from business logic. Which design pattern best supports this goal?

A hybrid app uses a web view with plugins to access native features. On one platform, calls to the camera plugin fail intermittently. What is the most effective troubleshooting step to start with?

A mobile team wants reliable automated checks for regressions across devices and OS versions. Which test approach best balances speed and coverage?

A team is preparing a release and wants to minimize risk by rolling out the update gradually and monitoring crashes before a full rollout. What should they do?

A mobile app supports multi-user login on a shared tablet. Security policy requires that user A cannot access user B’s cached data after logout, even offline. Which design is most appropriate?

After enabling code shrinking/obfuscation in a release build, a hybrid app’s JavaScript-to-native bridge works in debug but fails in release. What is the most likely cause and fix?

A team is designing a mobile app that must work reliably with intermittent connectivity. Users should be able to create and edit records offline and have changes synchronized later with minimal conflicts. Which design approach best meets this requirement?

A developer wants to make a hybrid mobile app feel responsive even on slower devices. Which practice is MOST effective for reducing UI thread work and improving perceived performance?

During testing, a mobile app crashes only when navigating back from a detail screen after rotating the device. Logs indicate the detail screen tries to access a UI element that is null. What is the MOST likely root cause?

A company wants to distribute a pre-release build to internal testers and collect feedback without publishing publicly. Which approach is MOST appropriate?

A mobile team needs to choose between a native approach and a hybrid approach for a new app. The app requires heavy use of device hardware features (camera, sensors), high-performance animations, and frequent platform-specific UI behavior. Which choice is MOST appropriate?

A QA engineer is creating automated tests for a mobile app. They want to validate a complete user flow (login, search, add to cart, checkout) across multiple screens and verify behavior as the user would see it. Which test type is the BEST fit?

A mobile app must securely call a backend API. The team wants to prevent exposing long-lived secrets in the app and ensure that a stolen access token has limited value. Which approach is MOST appropriate?

A developer notices that a hybrid app’s list screen becomes slower over time and eventually crashes. Memory profiling shows steadily increasing retained objects after navigating to the screen repeatedly. Which change is MOST likely to fix the issue?

A company is preparing to submit an enterprise mobile app to an app marketplace. The legal team requires that user data collection be transparent and minimized. Which action is MOST aligned with best practices for store submission and compliance?

A team uses a CI/CD pipeline to produce mobile builds. They want to ensure the same commit always produces a byte-for-byte identical release artifact to support auditing and simplify rollback verification. Which practice MOST directly supports this goal?

A team is designing a mobile app that must continue to function with limited connectivity and sync data when the network becomes available. Which architectural approach best supports this requirement?

A mobile app will store authentication tokens after a user signs in. Which storage choice is the recommended best practice for protecting these secrets on a device?

A developer wants a single codebase that can access camera, GPS, and push notifications while still using web technologies for most UI. Which approach best fits this requirement?

A team is troubleshooting a hybrid app where tapping a button triggers the action twice only on some devices. Which is the most likely cause in a hybrid environment?

A tester reports that a mobile screen is difficult to navigate with a screen reader and fails basic accessibility checks. Which change is MOST effective to improve accessibility in both native and hybrid UIs?

A mobile app must reduce battery drain while still receiving occasional updates from the server. Which design decision is the BEST practice?

An app uses client-side code to call a protected enterprise API. Security reviews show the app embeds a long-lived API key in the code. What is the MOST appropriate fix?

During regression testing, a crash occurs only on one device model after rotating the screen several times. Logs show increased memory usage followed by termination. Which debugging approach is MOST likely to pinpoint the root cause?

A company wants to distribute an internal mobile app to employees without making it publicly discoverable. Which distribution strategy is MOST appropriate?

A team uses a continuous integration pipeline for a mobile app. They need high confidence that a release build is reproducible and hasn’t been tampered with before submission. Which practice BEST addresses this?

A mobile team wants a consistent visual style across multiple screens and to avoid duplicating color, spacing, and typography values throughout the app. Which approach is the best practice?

A developer needs to add a "Scan Barcode" feature to a hybrid app. The feature must use the device camera and provide reliable scanning performance. What is the most appropriate implementation approach?

After building a release version of an app, crash reports show stack traces without readable method names, making debugging difficult. What should the team implement to improve release crash diagnosability?

A company has a mobile app with intermittent network connectivity. They want the app to remain usable and to sync changes when connectivity returns. Which architectural approach best meets this requirement?

A tester reports that a UI test passes on a developer device but fails on the CI simulator due to timing issues when waiting for data to load. What is the best way to make the UI test more reliable?

An app uses an embedded WebView for part of its UI. Users report the WebView sometimes shows stale content after a new deployment of the web assets. What is the most appropriate mitigation?

A product owner wants to roll out a new feature to a small percentage of users first, then expand if metrics look good, without forcing all users to update immediately. What is the best approach?

A team wants to ensure the app can recover gracefully when the backend returns transient errors (e.g., intermittent 503 responses). Which client-side strategy is recommended?

A company is preparing to distribute a mobile app to internal employees for testing and early feedback, without making it publicly searchable in an app store. Which distribution approach best fits this requirement?

A hybrid app uses a JavaScript-to-native bridge. Security review finds that any loaded web content could invoke sensitive native methods (e.g., reading contacts) through the bridge. What is the most effective mitigation?

A team is designing a mobile app that must continue to function with limited connectivity. Users should be able to create records offline and have them reliably synced when the device reconnects. Which architecture approach best meets this requirement?

A hybrid mobile app uses an embedded web view for most screens. A new feature needs fast barcode scanning with minimal latency and must work on both iOS and Android. What is the best approach?

After building a release version of a mobile app, the team notices that debug logs are still visible in production and may leak sensitive data. What is the best practice to prevent this?

A mobile app consumes multiple backend APIs that return JSON. The UI becomes sluggish when parsing and transforming responses. Which change is the most appropriate first step?

A developer reports that an Android build compiles, but at runtime a hybrid app cannot access a newly added native plugin method (it is undefined in JavaScript). What is the most likely cause?

A QA engineer is creating automated UI tests for a mobile app. Tests fail intermittently because element locators change when the UI layout shifts. What is the best practice to improve test stability?

A team needs to support two brands with mostly the same app features, but different colors, icons, and a few screens. They want to avoid maintaining two completely separate codebases. What is the best approach?

A mobile app rollout must be done gradually to reduce risk. The team wants to enable a new feature for a small percentage of users first, then expand if metrics look good—without requiring users to update the app each time. Which approach best fits?

A security review finds that the app stores authentication tokens in plain text preferences. The team must improve security while keeping the user signed in across app restarts. What is the best solution?

Crash reports show that the app frequently terminates on low-memory devices when users scroll a feed containing many images. Which fix is most appropriate?