220-1101 Mobile Devices Practice Test 9 — 15 Questions

Question 1

A user reports that their Android smartphone's screen does not rotate when the phone is turned sideways. The auto-rotate setting is enabled. The technician has already verified that the phone's operating system and apps are up to date. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The accelerometer is malfunctioning.. The accelerometer is the sensor responsible for detecting the device's orientation and triggering screen rotation. Since auto-rotate is enabled and the OS/apps are up to date, a malfunctioning accelerometer is the most likely cause, as it would fail to send the correct orientation data to the system.

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The gyroscope is malfunctioning.

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The touchscreen digitizer is damaged.

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The proximity sensor is blocked.

Question 2

A user reports that their Android smartphone's GPS is not working accurately. The technician has confirmed that Location settings are set to High accuracy mode. Which of the following is the BEST next step to resolve this issue?

Accepted Answer

Calibrate the compass. Calibrating the compass is the best next step because Android smartphones use a magnetometer (compass) to determine orientation, which is essential for accurate GPS positioning, especially when the device is moving. High accuracy mode uses GPS, Wi-Fi, and mobile networks, but if the compass is uncalibrated, the device cannot correctly interpret direction, leading to inaccurate location fixes. Calibration resolves this by re-establishing the magnetometer's reference to the Earth's magnetic field.

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Replace the GPS antenna

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Update the PRL

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Reset the network settings

Question 3

A user reports that their Android tablet's Wi-Fi connection frequently drops and reconnects. Other devices on the same network are stable. The technician has already forgotten the Wi-Fi network, rebooted the tablet, and confirmed the network password is correct. Which of the following is the BEST next step?

Accepted Answer

A. Update the tablet's firmware/OS. Since the issue is isolated to a single device and basic troubleshooting (forgetting the network, rebooting, verifying password) has not resolved it, the most likely cause is a software bug or driver incompatibility in the tablet's current firmware or OS. Updating the firmware/OS can patch known Wi-Fi connectivity bugs, such as those related to 802.11 power-save mode or DHCP lease renewal, which often manifest as intermittent disconnects.

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B. Change the Wi-Fi channel on the router

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C. Replace the tablet's Wi-Fi antenna

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D. Factory reset the tablet

Question 4

A user reports that their iPhone will not charge when plugged into a charger. The technician examines the Lightning port and notices that there is visible debris inside the port. The technician has tried different charging cables and power adapters, all of which work with other iPhones. Which of the following is the BEST next step to resolve the issue?

Accepted Answer

Use compressed air to blow out the debris.. The visible debris in the Lightning port is physically obstructing the connection between the cable and the port's pins. Since the technician has already verified that the cables and adapters work with other iPhones, the issue is isolated to the port itself. Using compressed air is the safest and most effective first step to dislodge debris without damaging the delicate internal components.

Answer

Replace the charging port assembly.

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Update the iOS to the latest version.

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Perform a factory reset on the iPhone.

Question 5

A user reports that their Android smartphone's battery drains very quickly, even when the phone is not in use. The user has already closed all background apps, and the battery statistics show that the 'Screen' is the top consumer at 35%, which seems normal. The technician notices that the phone's back feels warm near the top. Which component is MOST likely faulty?

Accepted Answer

A: Battery. The correct answer is A: Battery. A faulty battery can cause rapid discharge and generate excessive heat, even when the phone is idle and background apps are closed. The warmth near the top of the phone is a classic symptom of internal battery degradation or a shorted cell, leading to increased internal resistance and heat generation.

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B: Charging port

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C: Proximity sensor

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D: NFC chip

Question 6

A user reports that their iPhone is not recognized by a Windows computer when connected via USB. The user has tried three different USB cables, all of which allow the phone to charge normally. The user also tested another iPhone with the same computer and it was recognized. The iPhone's 'Trust This Computer' prompt appeared and was accepted. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The Lightning port on the iPhone has damaged data pins.. The fact that the iPhone charges normally but is not recognized by the computer indicates that the power pins in the Lightning connector are functioning, but the data pins are damaged or obstructed. Since another iPhone is recognized on the same computer, the issue is isolated to the original iPhone's Lightning port. The 'Trust This Computer' prompt appearing and being accepted confirms that the software trust relationship is not the problem, further pointing to a hardware data pin failure.

Answer

The iPhone's battery needs to be replaced.

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The iPhone's operating system is corrupt.

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The iPhone's display assembly is malfunctioning.

Question 7

A user reports that their Android smartphone's screen is cracked in the lower-left corner. The touch input in that area is unresponsive, but the display works correctly and the rest of the touchscreen functions normally. Which of the following is the BEST repair option?

Accepted Answer

C. Replace the entire screen assembly (LCD and digitizer combined). The correct answer is C because in modern smartphones, the digitizer (touch layer) and LCD panel are fused together into a single screen assembly. When the glass is cracked and touch input is lost in a specific area, the digitizer is damaged, but separating it from the LCD is impractical and risks further damage. Replacing the entire screen assembly ensures both the display and touch functionality are restored reliably.

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A. Replace only the digitizer (touch layer)

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B. Replace only the LCD panel

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D. Apply a tempered glass screen protector

Question 8

A user reports that their Android smartphone's battery drains very quickly during normal use and the phone feels unusually warm, especially near the back panel. The technician has already tested the charging cable and power adapter with another device and they work correctly. Which of the following components is MOST likely faulty?

Accepted Answer

Battery. The battery is the most likely faulty component because rapid drainage and excessive heat generation, particularly near the back panel where the battery is typically located, are classic symptoms of a degraded or internally shorted lithium-ion battery. A failing battery can have increased internal resistance, causing it to discharge quickly and convert electrical energy into heat rather than storing it properly.

Answer

Charging port/board

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Screen

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CPU/SoC

Question 9

A user's iPhone 12 is not making any sound during calls or notifications, but the ringer switch is not set to silent. The volume is turned up. The technician has already performed a force restart and updated iOS. Which of the following is the most likely cause?

Accepted Answer

The speaker grille is blocked by dirt or debris.. When an iPhone has no sound but the mute switch is off and volume is up, the most common cause is a blocked or dirty speaker grille. The Lightning port does not affect internal speaker audio. Bluetooth routing is possible but less likely unless a device is connected and the user is unaware. A swollen battery would cause physical distortion and other issues. Cleaning the speaker grille typically resolves this problem.

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The lightning port is clogged with debris, preventing audio output.

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The Bluetooth is enabled, causing audio to route to a disconnected device.

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The battery is swollen, pressing against internal components.

Question 10

A technician is replacing the battery in an Android smartphone. Which of the following is the MOST important step to prevent damage to the SIM card during the repair?

Accepted Answer

Remove the SIM card tray. The SIM card is a delicate component that can be easily damaged if the phone is opened without first removing it. By taking out the SIM card tray, you eliminate the risk of bending or scratching the SIM card when prying the battery or handling internal components. This step is critical because the SIM card sits on a flexible tray that can snap or warp under pressure, potentially rendering the card unusable.

Answer

Power off the phone

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Use a plastic spudger to pry the battery

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Disconnect the screen flex cable

Question 11

A user reports that their iPhone screen is cracked in the bottom-left corner. The display works correctly, but the touch input in the cracked area is unresponsive. The rest of the touchscreen functions normally. Which of the following is the BEST repair option?

Accepted Answer

Replace the complete screen assembly. The iPhone uses a fused display assembly where the LCD, digitizer, and glass are bonded together. Since the digitizer (touch layer) is damaged in the cracked area, replacing only the digitizer is not practical without specialized equipment to separate it from the LCD. Replacing the complete screen assembly restores both display and touch functionality, making it the best option.

Answer

Replace only the digitizer

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Replace only the LCD

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Apply a tempered glass screen protector

Question 12

A user brings in an iPhone that will not turn on. The technician has verified that the charging cable and power adapter work correctly by testing them with another iPhone. The technician attempts a force restart by pressing and holding the Side and Volume Down buttons, but the device remains unresponsive. Which of the following is the MOST likely cause of the issue?

Accepted Answer

Battery is completely discharged. The iPhone remains unresponsive even after a force restart, but the charging cable and adapter work with another device. This indicates the battery is completely discharged below the threshold required to initiate charging or power-on. Lithium-ion batteries have a protection circuit that can enter deep discharge mode, requiring a period of charging before the device will respond to any button presses.

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Faulty power button

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Water damage

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Logic board failure

Question 13

A user reports that their Android smartphone will not charge. The technician tries a different charging cable and wall adapter, but the phone still does not charge. The USB port on the phone appears clean and free of debris. Which of the following components is MOST likely faulty and should be replaced?

Accepted Answer

Charging port flex cable. The charging port flex cable is the most likely faulty component because the technician has already ruled out external factors (cable and wall adapter) and the USB port appears clean. The flex cable connects the USB port to the phone's motherboard, and internal damage or wear to this cable can interrupt power delivery even when the port itself looks fine. Replacing the flex cable is a common repair for charging issues that persist after basic troubleshooting.

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Battery

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Screen

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Processor

Question 14

A user's iPhone 12 has no sound from the speaker during phone calls, but the earpiece works normally. The user has confirmed that the volume is turned up and the silent switch is not enabled. The technician has performed a restart and updated iOS to the latest version. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The speaker grille is blocked or the speaker is faulty. The iPhone 12 uses a separate earpiece speaker for phone calls and a bottom-firing speaker for media and speakerphone. Since the earpiece works but the main speaker has no sound during calls, the issue is isolated to the bottom speaker grille being blocked (e.g., by debris or case obstruction) or the speaker itself being faulty. Restarting and updating iOS rules out software glitches, making hardware blockage or failure the most likely cause.

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The Lightning port is clogged

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The SIM card is damaged

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The screen is cracked

Question 15

A user reports that their Android smartphone's battery drains very quickly, even when the phone is idle. The phone also feels unusually warm near the back cover. The technician has already checked that no apps are running abnormally in the background and the screen brightness is set to auto. Which component is MOST likely faulty?

Accepted Answer

Battery. The battery is the most likely faulty component because a degraded or internally shorted lithium-ion battery can cause rapid self-discharge and excessive heat generation even when the device is idle. The technician has already ruled out abnormal background apps and screen brightness, which isolates the issue to the battery's internal chemistry or protection circuit.

Answer

Charging port

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Display screen

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Processor (SoC)