220-1101 Mobile Devices Practice Test 9 — 15 Questions

Question 1

A user's iPhone 13 will not power on after being plugged in overnight with a Lightning cable. The technician tries a different cable and power adapter with no success. The technician inspects the Lightning port and removes a small amount of debris, but the phone remains unresponsive. When the technician places the phone on a Qi wireless charger, the screen briefly displays a battery icon and then goes black. Which of the following is the MOST likely cause of the issue?

Choose an answer to begin — your selection is scored in the full session.

Accepted Answer

The Lightning port assembly is faulty. The phone responds to Qi wireless charging (brief battery icon) but not to wired charging, which isolates the issue to the Lightning port or its internal connection. Since the technician already tried different cables, adapters, and removed visible debris, the most likely cause is a faulty Lightning port assembly—such as a damaged connector, broken solder joints, or internal corrosion—that prevents power delivery via the Lightning path while leaving wireless charging functional.

Answer

The battery has failed and needs replacement

Answer

The power button is stuck in the pressed position

Answer

The logic board has a short circuit

Question 2

A user reports that their iPhone charges very slowly and only when the Lightning cable is held at a specific angle. The user has tried multiple known-good chargers and cables, but the issue persists. The technician inspects the Lightning port on the phone and sees what appears to be lint compacted at the bottom. Which of the following is the BEST next step for the technician to resolve this issue?

Accepted Answer

Gently clean the port with a wooden toothpick. The lint compacted at the bottom of the Lightning port is preventing the connector from seating fully, causing intermittent charging. Gently cleaning the port with a wooden toothpick is the safest and most effective method to dislodge the debris without damaging the delicate pins inside the port. This resolves the issue without replacing hardware or performing software resets.

Answer

Use compressed air to blow out the debris from the port

Answer

Replace the Lightning port assembly

Answer

Perform a factory reset on the iPhone

Question 3

A user reports that their iPhone 12 is stuck in a continuous boot loop—it shows the Apple logo, then turns off, and repeats. The user has already performed a force restart (Volume Up, Volume Down, hold Side button) multiple times without success. The iPhone is still running the original iOS version. Which of the following should the user try next to resolve this issue?

Accepted Answer

Connect the iPhone to a computer and put it into recovery mode, then restore via Finder or iTunes. A continuous boot loop on an iPhone that persists after a force restart typically indicates a corrupted operating system or failed firmware update. Since the iPhone is still on its original iOS version, the most effective next step is to connect it to a computer, put it into recovery mode (by pressing and releasing Volume Up, then Volume Down, then holding the Side button until the recovery mode screen appears), and restore the device via Finder (macOS Catalina or later) or iTunes (Windows or older macOS). This process reloads the iOS firmware and resolves software-level boot failures without requiring hardware replacement.

Answer

Replace the battery

Answer

Disconnect and reconnect the internal battery

Answer

Perform a factory reset from the Settings app

Question 4

A user reports that their Android smartphone charges very slowly and only when the charging cable is held at a specific angle. The technician inspects the charging port and it appears clean with no visible debris. Which of the following is the BEST first step to resolve this issue?

Accepted Answer

Gently remove any compacted lint from the port using a wooden toothpick or similar non-conductive tool.. The symptom of a smartphone charging only when the cable is held at a specific angle, despite a visually clean port, strongly indicates compacted debris deep inside the port that is not visible during a surface inspection. The best first step is to gently remove any compacted lint using a non-conductive tool like a wooden toothpick, as this is a common, low-risk fix that often resolves the issue without replacing hardware.

Answer

Replace the charging port assembly on the smartphone.

Answer

Use a can of compressed air to blow out the charging port.

Answer

Update the smartphone's operating system to the latest version.

Question 5

A user reports that their Android smartphone can see the corporate Wi-Fi network (SSID: CorpNet) but fails to connect, displaying 'Authentication error'. Other devices on the same network connect successfully. The technician has confirmed the Wi-Fi password is correct and the device is not using a static IP. Which of the following is the BEST first troubleshooting step?

Accepted Answer

'Forget' the network and reconnect by entering the password again.. The 'Authentication error' indicates a mismatch in stored credentials or security context, not a hardware or firmware issue. The most efficient first step is to 'Forget' the network (option C), which clears the cached password and any stale security parameters, then re-enter the known-correct password. This isolates the problem to the saved profile without resetting all network settings or guessing at security types.

Answer

Reset the network settings on the phone.

Answer

Modify the Wi-Fi security type on the phone to match the router.

Answer

Update the smartphone's firmware.

Question 6

A user reports that their iPhone 13 does not charge when plugged into the wall outlet using the original charging cable and adapter. The technician tries a different known-good Lightning cable and wall adapter, but the phone still does not charge. The technician inspects the Lightning port on the phone and sees that the port opening appears clean with no visible debris. Which of the following is the BEST next step to troubleshoot this issue?

Accepted Answer

Use a non-conductive tool (e.g., a plastic toothpick) to carefully probe the Lightning port and remove any hidden debris.. The technician's visual inspection may miss compacted debris deep inside the Lightning port. Using a non-conductive tool to gently probe can dislodge hidden lint or dirt that prevents proper contact between the Lightning connector and the port's pins, restoring charging capability without risking a short circuit.

Answer

Reset the network settings to rule out a software conflict affecting charging.

Answer

Connect the phone to a computer and perform a full restore via iTunes.

Answer

Replace the iPhone's battery immediately, as a dead battery is the most likely cause.

Question 7

A user reports that their Android smartphone's battery drains much faster than normal, even when the phone is idle. The technician checks the battery usage statistics and sees that 'Android System' and 'Google Play Services' are the top consumers. The user has already restarted the phone. Which of the following should the technician do NEXT to resolve the issue?

Accepted Answer

Check for and install any available OS and app updates. The battery drain is likely caused by a software bug or incompatibility in the OS or Google Play Services. Checking for and installing available OS and app updates can patch known issues, such as wakelock loops or background service inefficiencies, that cause excessive CPU usage and battery drain even when the phone is idle.

Answer

Perform a factory reset and restore from a backup

Answer

Replace the battery with a new one

Answer

Disable background data for all apps

Question 8

A user's smartphone has a cracked screen. The touch display still works partially, but there are areas where touch is unresponsive. The phone's LCD is intact, with no dead pixels or discoloration. Which component most likely needs to be replaced?

Accepted Answer

The digitizer. The digitizer is the touch-sensitive layer that registers touch input. Since the LCD is intact and displays correctly, the unresponsive touch areas indicate a damaged digitizer, not the display panel. Replacing the digitizer restores full touch functionality.

Answer

The battery

Answer

The LCD panel

Answer

The front-facing camera

Question 9

A technician replaces the glass/digitizer assembly on an iPhone 12. After reassembling the phone, it powers on and the display works, but the touch input is completely unresponsive. The technician has already reseated the screen connectors. Which of the following is the MOST likely cause of the touch failure?

Accepted Answer

The digitizer flex cable was torn or not properly connected during the repair. The digitizer flex cable is responsible for transmitting touch input from the glass/digitizer layer to the logic board. If it was torn during the replacement or is not fully seated despite reseating the main screen connectors, the touch function will fail while the display (which uses a separate LCD/OLED data path) still works. This is the most common physical failure in iPhone glass/digitizer replacements.

Answer

The replacement screen is not a genuine Apple part and is incompatible

Answer

The touch controller integrated circuit on the logic board is damaged

Answer

A software glitch occurred during reassembly that disabled the touch screen

Question 10

A user reports that their Android smartphone's screen remains black during phone calls, even when the phone is held away from the ear. The screen works normally at all other times. The technician has already cleaned the top of the phone where the sensors are located and verified that the screen protector is not obstructing anything. Which of the following components is MOST likely causing the issue?

Accepted Answer

Stuck or faulty proximity sensor. The proximity sensor is designed to detect when the phone is held to the ear and turn off the display to prevent accidental touches. If the sensor is stuck or faulty, it may continuously signal that the phone is against the ear, keeping the screen black even when held away. Cleaning the sensor and checking the screen protector are standard first steps, but if the issue persists, a defective proximity sensor is the most likely cause.

Answer

Failed ambient light sensor

Answer

Corrupted display driver

Answer

Battery saver mode enabled

Question 11

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.

Answer

The gyroscope is malfunctioning.

Answer

The touchscreen digitizer is damaged.

Answer

The proximity sensor is blocked.

Question 12

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.

Answer

Replace the GPS antenna

Answer

Update the PRL

Answer

Reset the network settings

Question 13

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.

Answer

B. Change the Wi-Fi channel on the router

Answer

C. Replace the tablet's Wi-Fi antenna

Answer

D. Factory reset the tablet

Question 14

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.

Answer

Update the iOS to the latest version.

Answer

Perform a factory reset on the iPhone.

Question 15

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. 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.

Answer

B: Charging port

Answer

C: Proximity sensor

Answer

D: NFC chip