Question 67 of 750

Mobile OS Features and Tools →mediumMultiple ChoiceObjective-mapped

Quick Answer

The answer is to open the phone dialer and enter a hardware test code like *#0*#. This built-in Android diagnostic tool, often called Hardware Test Mode, bypasses the operating system to run direct, isolated tests on individual components, making it the correct choice for verifying touchscreen and display functionality after physical damage. On the CompTIA A+ Core 2 220-1202 exam, this question tests your knowledge of manufacturer-specific diagnostic codes versus general troubleshooting tools; a common trap is confusing this with Developer Options’ “Show taps,” which only visualizes touch input without running a systematic test. Remember that Safe Mode disables third-party apps but won’t fix hardware-level flickering, and a factory reset is unnecessarily destructive. A useful memory tip: think of the asterisk and hash as “star and pound” to unlock the hardware’s secret test menu.

220-1202 Mobile OS Features and Tools Practice Question

This 220-1202 practice question tests your understanding of mobile os features and tools. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.

A user reports that their Android phone's screen is flickering and the touch response is erratic after they dropped it. They have already tried a reboot. Which built-in diagnostic tool should you use to test the touchscreen and display functionality without any third-party apps?

Question 1mediummultiple choice

Full question →

A
Boot the device into Safe Mode to see if the issue persists.
Why wrong: Safe Mode disables third-party apps but does not provide a hardware diagnostic; it only helps determine if an app is causing the issue.
B
Open the phone dialer and enter the hardware test code (e.g., *#0*#).
Many Android manufacturers include a built-in hardware diagnostic menu accessible via secret codes, allowing you to test the touchscreen, display, and other components.
C
Enable 'Show taps' in Developer Options.
Why wrong: This setting only shows a visual indicator when you touch the screen; it does not run a diagnostic or test the display itself.
D
Perform a factory reset from Recovery Mode.
Why wrong: A factory reset is a data-destructive measure that will not fix physical hardware damage caused by a drop.

Full breakdown with real-world context →

Answer choices

Why each option matters

Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.

Correct answer & explanation

✓

Open the phone dialer and enter the hardware test code (e.g., *#0*#).

Android includes a hidden 'Diagnostics' or 'Hardware Test' mode (often accessed via a code like *#0*# on Samsung devices) that allows you to test individual hardware components including the touchscreen, display colors, and sensors. The Developer Options 'Show taps' only visualizes touches but does not run a systematic test. Safe Mode only disables third-party apps, and a factory reset is too drastic.

Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

✗
Boot the device into Safe Mode to see if the issue persists.
Why it's wrong here
Safe Mode disables third-party apps but does not provide a hardware diagnostic; it only helps determine if an app is causing the issue.
✓
Open the phone dialer and enter the hardware test code (e.g., *#0*#).
Why this is correct
Many Android manufacturers include a built-in hardware diagnostic menu accessible via secret codes, allowing you to test the touchscreen, display, and other components.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable 'Show taps' in Developer Options.
Why it's wrong here
This setting only shows a visual indicator when you touch the screen; it does not run a diagnostic or test the display itself.
✗
Perform a factory reset from Recovery Mode.
Why it's wrong here
A factory reset is a data-destructive measure that will not fix physical hardware damage caused by a drop.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.

Trap categories for this question

Command / output trap
This setting only shows a visual indicator when you touch the screen; it does not run a diagnostic or test the display itself.

Detailed technical explanation

How to think about this question

This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.

KKey Concepts to Remember

Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.

TExam Day Tips

Underline the problem statement mentally.
Watch for words such as best, first, most likely and least administrative effort.
Review why wrong options are wrong, not only why the correct option is correct.

Key takeaway

Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.

Real-world example

How this comes up in practice

A practitioner preparing for the 220-1202 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.

What to study next

Got this wrong? Here's your next step.

Identify which 220-1202 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.

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FAQ

Questions learners often ask

What does this 220-1202 question test?

Mobile OS Features and Tools — This question tests Mobile OS Features and Tools — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: Open the phone dialer and enter the hardware test code (e.g., *#0*#). — Android includes a hidden 'Diagnostics' or 'Hardware Test' mode (often accessed via a code like *#0*# on Samsung devices) that allows you to test individual hardware components including the touchscreen, display colors, and sensors. The Developer Options 'Show taps' only visualizes touches but does not run a systematic test. Safe Mode only disables third-party apps, and a factory reset is too drastic.

What should I do if I get this 220-1202 question wrong?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

About these practice questions

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Same concept, more angles

1 more ways this is tested on 220-1202

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A customer reports that their Android phone's screen is unresponsive to touch after a drop. They can still hear notifications and see the display. Which built-in tool should you use to test the touchscreen functionality without relying on third-party apps?

easy

A.Safe Mode
B.Developer Options
✓ C.Diagnostics Mode (e.g., *#0*#)
D.Factory Reset

Why C: This question tests knowledge of Android's built-in diagnostic tools. The correct answer is the 'Diagnostics' or 'Test' mode, often accessed via the dialer code or settings, which allows hardware testing without third-party apps. This is a standard feature for verifying touchscreen integrity after physical damage.

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