220-1101 Mobile Devices Practice Question
A user reports that their iPhone's battery drains quickly throughout the day. The technician checks the Battery settings and sees that the display is the top consumer at 40%. The user mentions the screen is very bright outdoors. Which of the following settings would MOST effectively reduce battery drain in this scenario?
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
✓
Enable Auto-Brightness.
Enabling Auto-Brightness allows the phone to adjust screen brightness based on ambient light, reducing power consumption when full brightness is not needed. This directly addresses the high display battery usage.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Turn off Bluetooth.
Why it's wrong here
Bluetooth is a low-power radio technology that, when idle or connected to accessories like AirPods or an Apple Watch, draws only a few milliwatts—negligible compared to the display, which can consume several watts at high brightness. Even in an active connection, Bluetooth Low Energy (BLE) is designed for minimal energy consumption, so toggling it off would yield a very small, often imperceptible improvement in battery life. In this scenario, where drain is described as rapid throughout the day, the problem is far more likely to be screen brightness or heavy app usage, not Bluetooth. Thus, while turning off Bluetooth might save a tiny amount, it is not a high-impact fix.
When this WOULD be correct
A user reports that their iPhone battery drains quickly, and the Battery settings show that Bluetooth is the top consumer. In that scenario, turning off Bluetooth would most effectively reduce battery drain.
- ✓
Enable Auto-Brightness.
Why this is correct
Auto-Brightness is the most effective immediate step because the iPhone's display is typically the single largest battery consumer, especially when the user is outdoors or in varied lighting. This setting uses the ambient light sensor to continuously adjust screen luminance to the minimum comfortable level for the current environment, preventing the panel from running at full brightness unnecessarily. Since the scenario reports rapid drain throughout the day, which often correlates with high display usage, enabling Auto-Brightness directly targets the dominant power draw and can meaningfully extend battery life without other trade-offs.
- ✗
Disable Background App Refresh.
Why it's wrong here
Background App Refresh (BAR) allows apps to check for updates in the background, but it is not the primary cause of rapid battery drain when the display is the main consumer. Disabling BAR can save battery if many apps are frequently refreshing, but its impact is typically much smaller than reducing display brightness because network and background processing use significantly less power than the screen. In this scenario, the daily rapid drain suggests the screen is being used heavily (e.g., bright outdoor lighting), so adjusting brightness via Auto-Brightness is more targeted. While disabling BAR can be part of a broader battery-saving routine, it is not the most effective or direct step to address the reported symptom.
When this WOULD be correct
A user reports that their iPhone battery drains quickly, and the Battery settings show that a specific app (e.g., Facebook) is the top consumer. The user does not mention screen brightness issues. In this scenario, disabling Background App Refresh would reduce battery drain from that app's background activity.
- ✗
Reduce the screen resolution.
Why it's wrong here
iPhones do not expose a user-accessible screen resolution setting; iOS controls rendering at a fixed native resolution (e.g., 1170 x 2532 on many models) and uses the display's physical pixel grid. Some Android devices allow reducing resolution to save GPU/display power, but iOS does not offer this option in Settings, so this attempted fix is simply not valid for an iPhone. Even if a user could change resolution, the primary power draw from the display is backlight intensity, not the number of pixels being rendered; lowering resolution would have a minimal effect on battery life. Therefore, this is not a correct or actionable troubleshooting step for the described problem.
When this WOULD be correct
On an Android device where the user reports high battery drain and the display is the top consumer, and the device supports adjustable screen resolution, reducing the resolution can lower power consumption.
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.
✓Enable Auto-Brightness.Correct answer▾
Why this is correct
Auto-Brightness is the most effective immediate step because the iPhone's display is typically the single largest battery consumer, especially when the user is outdoors or in varied lighting. This setting uses the ambient light sensor to continuously adjust screen luminance to the minimum comfortable level for the current environment, preventing the panel from running at full brightness unnecessarily. Since the scenario reports rapid drain throughout the day, which often correlates with high display usage, enabling Auto-Brightness directly targets the dominant power draw and can meaningfully extend battery life without other trade-offs.
✗Turn off Bluetooth.Wrong answer — click to see why▾
Why this is wrong here
The primary battery drain is the display at 40% due to high brightness outdoors. Turning off Bluetooth would not address the screen brightness issue, and Bluetooth has minimal impact on battery compared to the display.
★ When this WOULD be the correct answer
A user reports that their iPhone battery drains quickly, and the Battery settings show that Bluetooth is the top consumer. In that scenario, turning off Bluetooth would most effectively reduce battery drain.
Why candidates choose this
Candidates often assume that any wireless radio (like Bluetooth) is a major battery drain, so they choose to disable it without analyzing the specific battery usage data provided in the question.
✗Disable Background App Refresh.Wrong answer — click to see why▾
Why this is wrong here
The question specifies that the display is the top consumer at 40% and the screen is very bright outdoors. Disabling Background App Refresh reduces battery drain from apps refreshing in the background, but it does not address the primary issue of high display brightness.
★ When this WOULD be the correct answer
A user reports that their iPhone battery drains quickly, and the Battery settings show that a specific app (e.g., Facebook) is the top consumer. The user does not mention screen brightness issues. In this scenario, disabling Background App Refresh would reduce battery drain from that app's background activity.
Why candidates choose this
Candidates may know that Background App Refresh consumes battery and assume it's a common fix for battery drain, overlooking the specific evidence (display at 40% and bright outdoor use) that points to Auto-Brightness as the more effective solution.
✗Reduce the screen resolution.Wrong answer — click to see why▾
Why this is wrong here
The iPhone does not allow users to manually reduce screen resolution; this setting is not available in iOS, so it cannot be used to reduce battery drain.
★ When this WOULD be the correct answer
On an Android device where the user reports high battery drain and the display is the top consumer, and the device supports adjustable screen resolution, reducing the resolution can lower power consumption.
Why candidates choose this
Candidates may assume that reducing screen resolution reduces power draw, similar to how it works on some computers or Android devices, but they overlook that iOS lacks this user-facing 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?”
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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.