An app uses the device's barometer to measure altitude. Which hardware-related compatibility risk is most relevant?

The app may drain the battery faster on devices with larger screens

The app may fail to connect to Wi-Fi on some devices

The app may have different colors on different screens

The app may not be compatible with devices that lack a barometer sensor

A team is testing a photo-editing app that applies heavy filters. On a low-memory device, the app is killed by the OS when applying a filter to a 12 MP photo. The team has two candidate fixes: (1) downscale the image before applying the filter, or (2) move the filter processing to a background thread. Which fix is more likely to prevent the OS kill, and why?

Move to a background thread, because it prevents the UI from freezing during the filter operation

Downscale the image, because it reduces the peak memory footprint that triggers the OS low-memory killer

Both fixes are equally effective because they both reduce the app's CPU usage

Neither fix will help; the app must be redesigned to use a different programming language

An app uses the flashlight (torch) feature. On one device model, the app crashes when the user toggles the flashlight while the camera is in use. The developer suspects the app is not handling a hardware-level failure. What is the most likely technical cause?

The app is using a deprecated flashlight API that is no longer supported

The camera and flashlight share the same hardware module, and the OS returns an error that the app does not catch

The device's battery level is below 5%, so the OS disables the flashlight

The app is requesting the flashlight API without checking if the device has a torch unit

An app uses the proximity sensor to turn off the screen during phone calls. On one device, the screen stays on during a call. The tester checks the sensor with a diagnostic app and it works. What is the most likely cause of the app-specific failure?

The device's screen is too bright to be turned off by the sensor

The app is not registering a listener for the proximity sensor correctly on that device's OS version

The app is using the accelerometer instead of the proximity sensor

The device's proximity sensor is physically broken

When is it most appropriate to use a real device instead of an emulator for hardware compatibility testing?

When testing app logic that does not involve hardware

When testing sensor behavior such as accelerometer or GPS

When testing network connectivity in a controlled environment

When testing the user interface layout on different screen sizes

Certified Tester Mobile Application Testing

Domain 2Objective 1

Testing for Compatibility with Device Hardware CT-MAT Practice Questions (Page 2)

Part of the Mobile Application Test Types domain, which makes up ~16% of our current practice bank. ISTQB does not publish an official question count, but from its 60-minute exam (~25–40 total, ~4–6 in this domain), expect 1–2 from this objective — we provide 30 practice questions to prepare you well beyond it. (estimate)

30questions here

6free pages

8concepts

Questions 6–10

6foundation · easy
An app uses the device's barometer to measure altitude. Which hardware-related compatibility risk is most relevant?
Select an answer first
7expert · hard
A team is testing a photo-editing app that applies heavy filters. On a low-memory device, the app is killed by the OS when applying a filter to a 12 MP photo. The team has two candidate fixes: (1) downscale the image before applying the filter, or (2) move the filter processing to a background thread. Which fix is more likely to prevent the OS kill, and why?
Select an answer first
8application · medium
An app uses the flashlight (torch) feature. On one device model, the app crashes when the user toggles the flashlight while the camera is in use. The developer suspects the app is not handling a hardware-level failure. What is the most likely technical cause?
Select an answer first
9application · medium
An app uses the proximity sensor to turn off the screen during phone calls. On one device, the screen stays on during a call. The tester checks the sensor with a diagnostic app and it works. What is the most likely cause of the app-specific failure?
Select an answer first
10foundation · easy
When is it most appropriate to use a real device instead of an emulator for hardware compatibility testing?
Select an answer first

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