220-1101 Mobile Devices Practice Test 4 — 15 Questions

Question 1

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?

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

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 2

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 3

A user reports that their Android smartphone's battery drains very quickly. The technician checks the battery stats and sees that the screen brightness is set to maximum and the battery health is reported as 'Good'. Which of the following settings should the technician suggest to MOST improve battery life?

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 4

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 5

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

Question 6

A user reports that their iPhone charges very slowly when connected to a USB port on their laptop, but charges normally using the included wall adapter. The cable is known to be functional. Which of the following is the MOST likely cause?

Accepted Answer

The laptop's USB port is a USB 2.0 port outputting lower current. USB ports on laptops, especially USB 2.0 ports, are typically limited to 500 mA (0.5 A) of current per the USB 2.0 specification. iPhones require higher current (typically 1 A or more) for fast charging, and the wall adapter provides that higher current. The slow charging is due to the laptop's USB port being unable to supply enough current, not a cable or software issue.

Answer

The iPhone's Lightning port is damaged

Answer

The laptop's USB driver is outdated

Answer

The iPhone's battery needs calibration

Question 7

A user's Android phone connects to the office Wi-Fi network and shows 'Connected' with full signal strength, but the user cannot load any websites. Other devices on the same network can access the internet without issues. The technician checks the phone's network settings and sees an IP address of 192.168.1.115 and a gateway of 192.168.1.1. The phone can successfully ping the gateway. Which of the following should the technician check NEXT?

Accepted Answer

The phone's DNS server settings. The phone can ping the gateway (192.168.1.1), confirming Layer 3 connectivity and that the gateway is reachable. Since other devices on the same network can access the internet, the issue is isolated to the phone's DNS resolution. Incorrect or missing DNS server settings would prevent domain name resolution while allowing IP-level communication, which matches the symptom of being unable to load websites despite full connectivity.

Answer

The phone's mobile data is enabled

Answer

The Wi-Fi network's security type

Answer

The phone's MAC address filtering

Question 8

A user's iPhone is not receiving any sounds from calls or notifications. The volume is turned up, and the silent switch is not enabled. The technician checks the Settings > Sounds & Haptics and sees that all alert volumes are at maximum. The user also reports that calls go directly to voicemail sometimes. Which of the following is the MOST likely cause?

Accepted Answer

Do Not Disturb mode is enabled.. Do Not Disturb (DND) mode silences all incoming calls and notifications while allowing the device to continue operating normally. Even with alert volumes at maximum and the silent switch disabled, DND will suppress sounds and can send calls directly to voicemail, matching the user's symptoms exactly.

Answer

The speaker hardware is faulty.

Answer

The phone's audio codec is corrupted.

Answer

The ringer switch is set to silent.

Question 9

A user's iPhone is connected to Wi-Fi and has an active cellular data plan. The user can send and receive regular SMS text messages, but cannot send iMessages. The recipient's device supports iMessage and other users can message that recipient without issues. The technician has already confirmed that the user's Apple ID is signed in correctly. Which of the following should the technician check NEXT?

Accepted Answer

Check the date and time settings and ensure they are set automatically. iMessage relies on Apple's push notification service and requires accurate date and time settings to establish a secure TLS connection with Apple's servers. If the date and time are incorrect, the SSL/TLS certificate validation fails, preventing iMessage from activating or sending messages even though SMS (which uses the cellular network's SS7 signaling) works fine. Since the Apple ID is confirmed correct and the recipient's device supports iMessage, the next logical step is to check and set the date and time to automatic.

Answer

Verify that Do Not Disturb is not enabled

Answer

Inspect the blocked contacts list in the Messages app

Answer

Update the APN settings for the cellular data connection

Question 10

A user reports that their iPhone displays 'No SIM' even though the SIM card is properly inserted. The technician has already removed and reinserted the SIM, and performed a restart. Which of the following should the technician do NEXT to isolate the issue?

Accepted Answer

Try the SIM card in another compatible phone.. The technician has already performed basic troubleshooting (reseating the SIM and restarting the device). The next logical step is to test the SIM card in another compatible phone to determine whether the issue lies with the SIM card itself or with the iPhone's SIM reader/baseband. This isolates the fault domain before proceeding with more invasive or irreversible steps.

Answer

Reset network settings.

Answer

Check for a carrier settings update.

Answer

Replace the SIM card with a new one.

Question 11

A user wants to pair a Bluetooth keyboard with their iPad. The keyboard is in pairing mode and has fresh batteries. The iPad's Bluetooth is turned on. The keyboard does not appear in the list of discovered devices. Which of the following should the user try FIRST?

Accepted Answer

Turn Bluetooth off and then back on.. The most common cause of a Bluetooth keyboard not appearing in the device list is a temporary communication glitch between the iPad's Bluetooth radio and the keyboard. Toggling Bluetooth off and then back on forces the radio to reset its discovery cache and re-scan for nearby devices, which often resolves the issue without requiring a full system restart or network reset.

Answer

Restart the iPad.

Answer

Reset all network settings.

Answer

Delete all previously paired Bluetooth devices.

Question 12

A user reports that their Android smartphone's battery drains very quickly even when the phone is not being used. The technician checks the battery usage statistics and sees that the screen is consuming a high percentage of power, but the screen is off during most of the idle time. Which of the following is the MOST likely cause of this issue?

Accepted Answer

A rogue app preventing the phone from sleeping. When the screen is off but still consuming high power in battery statistics, it indicates the device is not entering a proper deep sleep state. A rogue app can hold a partial wake lock (e.g., via Android's PowerManager.WakeLock API) preventing the CPU from suspending, causing the screen subsystem to remain active or the display to be falsely reported as the power consumer. This is the most likely cause because the battery drain occurs during idle periods with the screen physically off.

Answer

A faulty battery

Answer

The screen brightness set too high

Answer

Malware infected the phone

Question 13

A user reports that their Android smartphone is getting very hot while charging and the battery drains rapidly even when idle. The charger and cable are known to be functional. The technician opens the device and notices the battery is slightly bulging. Which of the following is the MOST likely cause of the symptoms?

Accepted Answer

Defective battery. A bulging battery indicates internal chemical degradation, often due to lithium-ion cell failure from overcharging, age, or manufacturing defects. This swelling can cause internal short circuits, leading to excessive heat generation during charging and rapid self-discharge even when idle. Since the charger and cable are known functional, the battery itself is the most likely root cause.

Answer

Faulty charging port

Answer

Failed power management IC

Answer

Damaged screen

Question 14

A user reports that their Android smartphone will not charge when connected to a USB-C cable. The user has tried multiple chargers and cables, all of which work fine with other devices. The phone's battery is nearly empty. The technician inspects the phone's USB-C port and sees no visible damage. Which of the following should the technician do FIRST?

Accepted Answer

Gently clean the USB-C port with a toothpick or non-conductive tool. The most common cause of a device not charging despite functional cables and chargers is debris or lint compacted inside the USB-C port. Gently cleaning with a non-conductive tool (like a toothpick or plastic pick) can remove the obstruction without damaging the delicate pins, restoring electrical contact. This is a quick, non-invasive first step before any hardware replacement.

Answer

Perform a factory reset on the phone

Answer

Replace the battery

Answer

Replace the USB-C charging port assembly

Question 15

A user reports that their iPhone will not connect to a Bluetooth speaker that is in pairing mode. The speaker is visible to other smartphones in the area. The technician has already restarted the iPhone and ensured Bluetooth is enabled. Which of the following should the technician do NEXT?

Accepted Answer

Forget the device on the iPhone and re-pair. The speaker is visible to other smartphones, which confirms the speaker's Bluetooth radio and pairing mode are functional. The iPhone can see the speaker (since it's visible to other devices), but fails to connect, indicating a corrupted or stale pairing profile on the iPhone. Forgetting the device removes the stored link key and Bluetooth cache, forcing a fresh pairing handshake (SDP and LMP procedures) that typically resolves such connection failures.

Answer

Reset network settings on the iPhone

Answer

Replace the Bluetooth antenna in the iPhone

Answer

Update the firmware on the Bluetooth speaker