220-1101 Mobile Devices Practice Question
A user reports that their Android smartphone's battery drains significantly faster than usual. The technician checks the battery usage statistics and finds that the screen is consuming 60% of the battery. The screen brightness is manually set to maximum. Which of the following is the MOST effective step to reduce battery consumption?
⚠ Common exam trap
CompTIA often tests the candidate's ability to identify the most direct and effective solution based on diagnostic data, rather than choosing a generic troubleshooting step like a factory reset or disabling a feature unrelated to the reported symptom.
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
✓
Reduce screen brightness
The screen is the primary battery consumer, and manual maximum brightness forces the display to use full backlight power. Reducing screen brightness directly lowers the power draw of the display, which is the most effective immediate step to extend battery life. This addresses the root cause identified in the battery usage statistics.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Disable mobile data
Why it's wrong here
Disabling mobile data only cuts the cellular radio's LTE/5G connection, stopping background network traffic and reducing power draw from the modem—but this is second to the display unless you're in a low-signal area where the radio amplifies its output. While it can extend battery life by preventing apps from syncing, it does nothing to change the brightness level, which is the dominant and constant consumer described in the scenario. If the drain is simply due to a high screen brightness, turning off data will leave that primary drain untouched and also denies you useful connectivity.
When this WOULD be correct
This option would be correct in a scenario where a user reports rapid battery drain and the battery usage statistics show that a specific app or system service is consuming a large percentage of battery due to constant data synchronization or background data usage, and the screen brightness is not a factor.
- ✓
Reduce screen brightness
Why this is correct
Lowering brightness directly decreases the current supplied to the display panel—on OLED phones each pixel's luminance is tied to current through the organic diodes, while on LCDs it reduces the backlight's LED power. Since the screen is typically the largest consumer of battery during active use, even a 20% reduction in brightness can yield noticeable gains in runtime. Additionally, manual dimming is an immediate, reversible setting that doesn't sacrifice connectivity or wipe user data, making it the most targeted first step for abnormal drain.
- ✗
Remove the battery and reinsert it
Why it's wrong here
On phones with user-replaceable batteries, pulling the battery forces a hard power-off and clears volatile memory, but it has no effect on persistent OS or hardware settings—the screen brightness remains exactly as set when the phone boots back up. Many modern flagships lack removable batteries entirely, with the cell glued into the chassis, so on those devices this action isn't even possible without disassembly and violates warranty. Reinserting the same battery neither changes its chemistry nor reduces the display's draw; it only serves as a rough way to reboot, which is irrelevant to the brightness problem.
When this WOULD be correct
This would be correct if the question described a smartphone with a non-removable battery that is experiencing random shutdowns or failure to charge, where reseating the battery (if possible) could fix a loose connection.
- ✗
Perform a factory reset
Why it's wrong here
A factory reset erases all user data and restores the operating system to its default state, which can purge misbehaving apps or corrupted settings, but it is a sledgehammer. It cannot alter physical hardware constants like the display's power curve, and after the reset the same brightness setting will draw the same battery power unless you also change it. Moreover, if the drain stems from a simple configuration issue like screen brightness, resetting incurs app re-installation and data loss without addressing the underlying cause, making it an unnecessarily risky and delayed solution.
When this WOULD be correct
A factory reset would be correct if a user reports severe battery drain after installing a malicious app or after a system update causes a software conflict that cannot be resolved by other means, and the technician has confirmed no hardware issues.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The 220-1101 exam frequently reuses these exact scenarios with slightly different constraints.
✓Reduce screen brightnessCorrect answer▾
Why this is correct
Lowering brightness directly decreases the current supplied to the display panel—on OLED phones each pixel's luminance is tied to current through the organic diodes, while on LCDs it reduces the backlight's LED power. Since the screen is typically the largest consumer of battery during active use, even a 20% reduction in brightness can yield noticeable gains in runtime. Additionally, manual dimming is an immediate, reversible setting that doesn't sacrifice connectivity or wipe user data, making it the most targeted first step for abnormal drain.
✗Disable mobile dataWrong answer — click to see why▾
Why this is wrong here
Disabling mobile data would not address the primary cause of battery drain, which is the screen consuming 60% of battery due to maximum brightness. Mobile data consumption is not indicated as a significant factor in this scenario.
★ When this WOULD be the correct answer
This option would be correct in a scenario where a user reports rapid battery drain and the battery usage statistics show that a specific app or system service is consuming a large percentage of battery due to constant data synchronization or background data usage, and the screen brightness is not a factor.
Why candidates choose this
Candidates may assume that mobile data is a major battery drainer and disabling it is a common quick fix, overlooking that the screen brightness is the dominant issue here.
✗Remove the battery and reinsert itWrong answer — click to see why▾
Why this is wrong here
Removing and reinserting the battery does not address the root cause of high battery drain from maximum screen brightness; it only resets the device temporarily without changing the brightness setting.
★ When this WOULD be the correct answer
This would be correct if the question described a smartphone with a non-removable battery that is experiencing random shutdowns or failure to charge, where reseating the battery (if possible) could fix a loose connection.
Why candidates choose this
Candidates may think that a battery reset can recalibrate battery usage or fix software glitches causing drain, but it does not reduce the power consumption of the screen.
✗Perform a factory resetWrong answer — click to see why▾
Why this is wrong here
Performing a factory reset erases all data and settings, but the battery drain is caused by high screen brightness, not software corruption or misconfiguration. A reset is excessive and does not address the root cause.
★ When this WOULD be the correct answer
A factory reset would be correct if a user reports severe battery drain after installing a malicious app or after a system update causes a software conflict that cannot be resolved by other means, and the technician has confirmed no hardware issues.
Why candidates choose this
Candidates may think a factory reset can fix any persistent problem, including battery drain, because it restores the device to its original state, but they overlook that the issue here is a simple user-adjustable setting.
Analysis generated from the official 220-1101blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Go deeper
Related to this question
About these practice questions
This 220-1101 question is part of Courseiva's 896-question bank — original exam-style content with full explanations and wrong-answer analysis, never real exam questions or exam dumps. Learn why practice questions differ from exam dumps →
Same concept, more angles
1 more way this is tested on 220-1101
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 user reports that their Android smartphone's battery drains very quickly. The technician checks the battery stats and sees that the screen brightness is set to maximum and the battery health is reported as 'Good'. Which of the following settings should the technician suggest to MOST improve battery life?
easy- A.Enable airplane mode.
- ✓ B.Reduce the screen brightness.
- C.Disable all background processes.
- D.Remove the phone's case.
Why B: The screen is the largest power consumer on a smartphone, and maximum brightness significantly increases battery drain. Since the battery health is already 'Good', reducing screen brightness directly addresses the primary cause of rapid discharge without disabling necessary functions.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This 220-1101 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1101 exam.