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QA / Test Automation Mq Device Lab Emulator Parallelization Interview Questions

75 verified QA / Test Automation Mq Device Lab Emulator Parallelization interview questions — solve with answers, learn from explanations, test yourself in a real simulation.

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Sample questions

Mq Device Lab Emulator ParallelizationDifficulty 1
Running adb devices on a machine with one emulator booted and one physical phone connected over USB shows both listed with state device. What does the device state indicate for each entry?
  • aThe host's adb daemon has authorized that device or emulator.✓
  • bThe device is currently running Android Test Orchestrator against it.
  • cThe device has USB debugging disabled and is running in a restricted mode.
  • dThe device is still booting and adb is waiting for the boot animation to finish.
Explanation:device means adb has a working, authorized connection and can send commands. Other states such as unauthorized, offline, or the entry simply not appearing reflect different connection problems, not this one.
Mq Device Lab Emulator ParallelizationDifficulty 2
An Android emulator and a physical Android phone are both used to run the same UI test suite. Which statement correctly describes a core mechanism difference between them?
  • aThe emulator always runs the exact same kernel build as the physical device's kernel.
  • bThe physical device requires Android Test Orchestrator while the emulator does not support it at all.
  • cThe emulator runs a virtualized Android system image on the host machine's own CPU.✓
  • dThe emulator can only run release-signed APKs, while the physical device only accepts debug builds.
Explanation:The emulator is a virtualized system image executing on the host machine's CPU and simulated peripherals; the physical device runs the OS on its own real silicon, GPU, and radios. That distinction underlies most fidelity gaps between the two.
Mq Device Lab Emulator ParallelizationDifficulty 2
A tester runs:
adb install -r app-debug.apk

on a device where an older debug build of the same app is already installed and has existing local data (e.g. a saved login). What happens to the app's existing data after this command?
  • aThe app is uninstalled first, so all local data is wiped before the new APK installs.
  • bThe install fails because -r blocks installing over an existing package.
  • cThe new APK replaces the old one in place and the app's existing local data is kept.✓
  • dThe command only works if the target is a virtual emulator, not a physical device.
Explanation:The -r flag reinstalls the app, replacing the APK while keeping its existing data directory intact. Without -r, installing over an already-present same package typically fails instead.
Mq Device Lab Emulator ParallelizationDifficulty 2
Which sequence of xcrun simctl subcommands matches the standard flow to get an iOS Simulator running with a freshly built app open, starting from a shutdown simulator?
  • asimctl erase, then simctl launch, then simctl install.
  • bsimctl boot <udid>, then simctl install <udid> <app path>, then simctl launch <udid> <bundle id>.✓
  • csimctl install, then simctl boot, with no launch step needed since install auto-launches the app.
  • dsimctl launch first to start the runtime, then simctl boot to attach the app to it.
Explanation:The simulator must be booted before it can install or launch an app, and installing an app does not launch it automatically — launch is a separate explicit step.
Mq Device Lab Emulator ParallelizationDifficulty 2
Why can't an iOS Simulator build of an app (the .app produced for platform=iOS Simulator) simply be copied onto a physical iPhone and run there?
  • aIt is compiled and linked against the simulator SDK, a different build target than a physical device executes.✓
  • bPhysical iPhones refuse any app that was not first submitted through App Store Connect.
  • cThe simulator build is always encrypted with a developer-only key that no physical device can decrypt.
  • dSimulator builds are missing an app icon, which iOS requires in order to install on hardware.
Explanation:Simulator builds target the iphonesimulator SDK, a separate build target from iphoneos; the resulting binary and its linked frameworks are not what a physical device's OS can execute, regardless of code signing or icons.
Mq Device Lab Emulator ParallelizationDifficulty 1
What is the primary purpose of running adb logcat while a mobile test suite executes?
  • aIt records a video of the screen for later playback.
  • bIt streams the device's system and app log output in real time.✓
  • cIt automatically retries any test that fails during the current run.
  • dIt installs the instrumentation APK required for the test run to start.
Explanation:adb logcat streams live log output from the device (system and app-level), which is a primary tool for diagnosing what happened around a failure.

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