A team is testing a camera app that relies on the gyroscope for image stabilization. They have a limited budget and need to cover 50 device models. The app's core logic is well-covered by unit tests. Which strategy best balances coverage and fidelity for the stabilization feature?

Test on 5 real devices with different gyroscope vendors and use emulators for the remaining 45 models

Run all 50 models on emulators to maximize coverage at minimal cost

Test only on the flagship device and rely on the vendor's certification for the rest

Use a cloud device lab for all 50 models and skip local testing entirely

Which scenario represents the highest hardware compatibility risk for a mobile app?

The app targets a wide range of devices with varying hardware capabilities

The app uses a single resolution for all screens

The app uses only standard APIs available on all target OS versions

The app is tested on the latest flagship device only

A video editing app renders 4K footage. The team plans to support a budget device with 3 GB RAM and a mid-range GPU. During testing, the app crashes when rendering a 10-minute clip. Which test would best isolate whether the crash is due to memory pressure or GPU capability?

Reduce the clip length to 5 minutes and see if the crash still occurs

Run the render on an emulator with 3 GB RAM and a software-rendered GPU

Check the device's available storage before and after the render

Repeat the same render on a device with 6 GB RAM and the same GPU

How does a mobile app typically access the device's camera hardware?

By sending a request to the device manufacturer's support server

Through a Bluetooth connection to the camera module

Through a public API provided by the operating system

By directly writing to the camera's memory-mapped registers

A tester finds that a navigation app shows the wrong compass heading on a specific device. The defect is reproducible only when the device is held vertically. Which defect report contains the most useful information for a developer to fix the issue?

The magnetometer sensor is broken on this device.

On Samsung Galaxy S23 (Android 14), the compass shows 90° off when the device is held vertically (portrait, screen facing user). Works correctly when held flat. Expected: heading matches a physical compass.

Compass is wrong on device X. Please fix.

Compass calibration fails on all Samsung devices.

Certified Tester Mobile Application Testing

Domain 2Objective 1

Testing for Compatibility with Device Hardware CT-MAT Practice Questions (Page 1)

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 1–5

1application · medium
A team is testing a camera app that relies on the gyroscope for image stabilization. They have a limited budget and need to cover 50 device models. The app's core logic is well-covered by unit tests. Which strategy best balances coverage and fidelity for the stabilization feature?
Select an answer first
2foundation · easy
Which scenario represents the highest hardware compatibility risk for a mobile app?
Select an answer first
3application · medium
A video editing app renders 4K footage. The team plans to support a budget device with 3 GB RAM and a mid-range GPU. During testing, the app crashes when rendering a 10-minute clip. Which test would best isolate whether the crash is due to memory pressure or GPU capability?
Select an answer first
4foundation · easy
How does a mobile app typically access the device's camera hardware?
Select an answer first
5application · medium
A tester finds that a navigation app shows the wrong compass heading on a specific device. The defect is reproducible only when the device is held vertically. Which defect report contains the most useful information for a developer to fix the issue?
Select an answer first

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