220-1101 Mobile Devices Practice Test 9 — 15 Questions

Question 1

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?

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

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 2

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?

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

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 3

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 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?

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

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 5

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 6

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 7

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?

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

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 8

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?

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

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 9

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?

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

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 10

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 11

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 12

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?

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

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

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D: NFC chip

Question 13

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.

Answer

The iPhone's operating system is corrupt.

Answer

The iPhone's display assembly is malfunctioning.

Question 14

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?

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

Accepted Answer

C. Replace the entire screen assembly (LCD and digitizer combined). 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.

Answer

A. Replace only the digitizer (touch layer)

Answer

B. Replace only the LCD panel

Answer

D. Apply a tempered glass screen protector

Question 15

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?

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

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

Answer

Screen

Answer

CPU/SoC