220-1101 Mobile Devices Practice Test 3 — 15 Questions

Question 1

A user reports that their Android smartphone will not charge when placed on a wireless charging pad. The phone charges normally when connected via a USB cable. The technician tests the wireless charging pad with another smartphone, and it works fine. 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 phone case is interfering with the wireless charging. A thick, metallic, or improperly designed phone case can block or interfere with the electromagnetic field used for inductive charging. Since the charging pad works with another phone and the phone charges via USB, the issue is specific to the phone's ability to receive the wireless signal, and the case is the most common physical barrier.

Answer

The wireless charging coil inside the phone has failed

Answer

The phone is not placed correctly on the charging pad

Answer

A software setting is disabling wireless charging

Question 2

A user's iPhone 11 is stuck in a boot loop after an attempted jailbreak. The device repeatedly shows the Apple logo and then restarts. The technician connects the iPhone to a computer; iTunes displays a message that the device is in recovery mode and must be restored. The technician attempts a force restart and tries a different USB cable and computer, but the iPhone remains in recovery mode and enters the boot loop after any restore attempt. Which of the following is the NEXT best step?

Accepted Answer

Perform a DFU restore. The iPhone is stuck in a boot loop after a failed jailbreak, and standard recovery mode restores are failing. A DFU (Device Firmware Update) restore bypasses the bootloader and iBoot, allowing the device to be completely wiped and the firmware reinstalled at the lowest level, which is necessary to recover from a corrupted boot chain caused by the jailbreak attempt.

Answer

Replace the battery

Answer

Replace the logic board

Answer

Update iOS using over-the-air (OTA)

Question 3

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?

Accepted Answer

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

Turn off Bluetooth.

Answer

Disable Background App Refresh.

Answer

Reduce the screen resolution.

Question 4

A user reports that during phone calls on their Android smartphone, the caller's voice sounds very low and muffled through the earpiece speaker. The technician has cleaned the speaker grille with a soft brush and the issue persists. The phone otherwise functions normally with media sounds playing at adequate volume. Which of the following should the technician check NEXT?

Accepted Answer

Check the call volume setting and adjust it during a test call. The symptom—low and muffled voice specifically during calls, with normal media volume—points to a call volume setting being too low, not a hardware failure. The technician should first adjust the in-call volume during a test call, as this is a separate software-controlled gain stage from media volume. Since cleaning the grille didn't resolve it, the next logical step is to verify and adjust the call volume slider, which is a common user-misconfiguration issue.

Answer

Replace the earpiece speaker module

Answer

Disable Bluetooth to rule out audio redirection

Answer

Reset the audio codec settings in developer options

Question 5

An iPhone 12 charges slowly when connected to a laptop's USB 3.0 port, but charges normally when using the original wall adapter and cable. The technician has already tested the cable with the wall adapter and it works correctly. Which of the following is the MOST likely cause of the slow charging?

Accepted Answer

The laptop's USB port provides lower amperage than the wall adapter. USB 3.0 ports on laptops typically provide a maximum of 0.9A (900mA) of current, while the iPhone 12's original wall adapter can deliver up to 2.4A or more via USB-A to Lightning, or 20W via USB-C Power Delivery. Since the cable works correctly with the wall adapter, the bottleneck is the laptop's USB port's lower amperage, which directly limits charging speed.

Answer

The Lightning cable is damaged

Answer

iOS battery optimization feature is limiting charging speed

Answer

The charging port on the iPhone is damaged

Question 6

A user reports that their Android smartphone will not charge when placed on a wireless charging pad. The phone charges normally when connected via a USB cable. The technician tests the wireless charging pad with another smartphone, and it works fine. 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

APN settings. MMS messages require a specific APN configuration that includes both an MMS proxy and MMS port, which are separate from the standard internet APN settings. Since the user can send SMS and browse the web, the core cellular data connection works, but the missing or incorrect MMS proxy/port values in the APN prevent the phone from establishing the necessary WAP gateway connection for MMS delivery. Checking the APN settings first is the logical step because MMS relies on a dedicated data channel through the carrier's MMS server, not the standard internet APN.

Answer

Data roaming setting

Answer

Message center number

Answer

Wi-Fi calling setting

Question 7

A technician needs to replace a cracked LCD screen on an Android smartphone. After disassembling the phone and disconnecting the old screen, which of the following should the technician do FIRST before installing the new screen?

Accepted Answer

Remove or disconnect the battery. The correct first step before installing a new screen is to remove or disconnect the battery. This ensures the device is completely powered off and eliminates the risk of short circuits or electrostatic discharge (ESD) that could damage the new LCD or other sensitive components during installation. Even if the phone appears off, residual charge in capacitors can cause damage if the battery remains connected.

Answer

Connect the new screen and test the display immediately

Answer

Apply adhesive to the frame to secure the new screen

Answer

Update the smartphone's firmware to the latest version

Question 8

A user reports that their Android smartphone will not charge when placed on a wireless charging pad. The phone charges normally when connected via a USB cable. The technician tests the wireless charging pad with another smartphone, and it works fine. 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 laptop is in battery saving mode, limiting USB power output. When a laptop is in battery saving mode, it often restricts the power output from its USB ports to conserve energy, even if the port supports Power Delivery (PD). This limitation reduces the current available to the smartphone, resulting in slow charging despite the cable and charger being capable of fast charging when connected to a wall outlet.

Answer

The smartphone's USB-C port is damaged

Answer

The cable is not rated for Power Delivery

Answer

The laptop's USB drivers are outdated

Question 9

A user reports that their Android smartphone will not charge when placed on a wireless charging pad. The phone charges normally when connected via a USB cable. The technician tests the wireless charging pad with another smartphone, and it works fine. 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

Digitizer malfunction. The touchscreen digitizer is the layer responsible for detecting touch input. A narrow vertical strip of unresponsiveness, without any physical damage or other display issues, is a classic symptom of a failing or damaged digitizer, not the LCD panel. The LCD panel only handles image display, which is reported as normal.

Answer

LCD panel damage

Answer

Software calibration issue

Answer

Battery swelling

Question 10

A user reports that their Android smartphone will not charge when placed on a wireless charging pad. The phone charges normally when connected via a USB cable. The technician tests the wireless charging pad with another smartphone, and it works fine. 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 magnetic kickstand interferes with the magnetometer.. The magnetic kickstand in the rugged case creates a local magnetic field that interferes with the phone's magnetometer. The magnetometer is used to determine the device's orientation relative to Earth's magnetic field, and when it is disrupted, the GPS system cannot accurately correct for heading changes, causing the location to jump or drift, especially indoors where GPS signals are weaker.

Answer

The GPS antenna is damaged.

Answer

The phone's software needs an update.

Answer

The battery is failing and causing voltage fluctuations.

Question 11

A user dropped their Android smartphone and now the touchscreen is unresponsive in a small area near the top of the display. The screen is not cracked, and the LCD portion of the display still shows images correctly. Which component is MOST likely damaged?

Accepted Answer

Digitizer. The digitizer is the touch-sensitive layer that registers touch input. When a specific area of the touchscreen becomes unresponsive after a drop, but the LCD still displays images correctly, the digitizer is the most likely damaged component because it is a separate glass layer bonded to the LCD and is susceptible to impact damage even without visible cracks.

Answer

LCD panel

Answer

Battery

Answer

Motherboard

Question 12

A user reports that their iPhone 13 frequently shuts down unexpectedly when the battery indicator shows between 15% and 20% charge. The phone displays the low battery warning and then powers off. The user has already force-restarted the device and checked for iOS updates. The battery health reading in Settings shows 79% maximum capacity. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The battery has degraded and can no longer hold sufficient voltage under load. The iPhone 13's battery health reading of 79% maximum capacity indicates significant chemical aging. When a lithium-ion battery degrades past 80%, its internal resistance increases, causing voltage to sag under load. At low charge levels (15-20%), the voltage drop can trigger the device's safety cutoff, causing an unexpected shutdown even though the software still reports remaining charge.

Answer

A faulty charging port or cable

Answer

The battery requires calibration by fully draining and recharging

Answer

A defective logic board or power management IC

Question 13

A user reports that their Android smartphone will not charge when placed on a wireless charging pad. The phone charges normally when connected via a USB cable. The technician tests the wireless charging pad with another smartphone, and it works fine. 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

Reduce the screen brightness.. 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.

Answer

Enable airplane mode.

Answer

Disable all background processes.

Answer

Remove the phone's case.

Question 14

A user's Android phone has a cracked screen, but the touch functionality still works. The user wants to prevent glass fragments from falling out and to protect their fingers until the phone can be repaired. Which of the following is the BEST immediate action?

Accepted Answer

Apply a screen protector. Applying a screen protector is the best immediate action because it adheres to the cracked glass, holding fragments in place and providing a smooth surface to protect the user's fingers until a full repair can be performed. The touch functionality still works, so the digitizer (the touch-sensitive layer beneath the glass) is intact, meaning a simple protective layer is sufficient for temporary containment without interfering with capacitive touch sensing.

Answer

Replace the digitizer assembly

Answer

Power off the phone

Answer

Use a case that covers the screen

Question 15

A user's Android phone screen is cracked but still works. The user wants to continue using the phone temporarily without risk of glass cuts or further damage. What is the BEST immediate solution?

Accepted Answer

Apply a tempered glass screen protector. Applying a tempered glass screen protector over the cracked screen will hold the broken glass together, preventing glass fragments from falling out and reducing the risk of cuts. Replacing the digitizer is a permanent repair, not immediate. Using gloves is impractical for daily use and does not protect the phone from further damage. Removing the broken glass can expose internal components and is dangerous. A screen protector is the safest temporary measure.

Answer

Replace the digitizer

Answer

Use the phone with gloves

Answer

Remove the broken glass