220-1101 Mobile Devices Practice Test 8 — 15 Questions

Question 1

A user reports that their iPhone does not charge when plugged into the USB port of a Windows laptop, but it charges normally with the included wall adapter. The laptop recognizes other USB devices such as a mouse and a flash drive. 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's USB port does not provide enough power to charge the iPhone. The iPhone charges normally with the wall adapter, which provides higher current (typically 5V/1A or more), but fails when connected to the laptop's USB port. Standard USB 2.0/3.0 ports on laptops typically supply only 0.5A (USB 2.0) or 0.9A (USB 3.0), which may be insufficient to charge an iPhone, especially if the device is in use or the port is shared among multiple internal components. The laptop recognizing other low-power devices (mouse, flash drive) confirms the port is functional but likely cannot deliver the required charging current.

Answer

The Lightning cable is damaged and cannot carry enough power

Answer

The iPhone battery has reached the end of its lifespan and cannot hold a charge

Answer

The laptop's USB driver is outdated or corrupted

Question 2

A user's Android smartphone exhibits a strange charging behavior. When the phone is powered off and connected to the wall charger, it charges normally and the battery percentage increases. However, when the phone is powered on and plugged into the same charger, the device shows the charging icon, but the battery percentage steadily decreases over time, eventually causing the phone to shut down. The user has already tried different charging cables and adapters, and has performed a factory reset. Which component is MOST likely faulty?

Accepted Answer

Battery. The battery is most likely faulty because it can hold a charge when the phone is off (minimal current draw) but fails under the higher load of the powered-on system. A degraded battery's internal resistance increases, causing voltage sag under load, which the PMIC interprets as a low charge state, leading to a net discharge despite the charger being connected.

Answer

Charging port / USB connector

Answer

Power management integrated circuit (PMIC)

Answer

Operating system battery calibration

Question 3

A user's Android smartphone charges normally when powered off and connected to a wall charger. However, when the phone is powered on and connected to the same charger, the battery percentage decreases over time despite showing the charging icon, eventually causing the phone to shut down. The user has tried multiple charging cables and adapters, performed a factory reset, and the issue persists. Which of the following is the MOST likely cause?

Accepted Answer

The battery has reached end-of-life and cannot hold a charge. The fact that the phone charges normally when powered off but discharges when powered on indicates that the battery can accept a charge but cannot supply enough current to meet the device's operational demands. This is a classic symptom of a battery that has reached its end-of-life, where its internal resistance has increased significantly, causing the voltage to sag under load. The factory reset and cable/adapter swaps rule out software and accessory issues, isolating the battery as the most likely culprit.

Answer

The charging port is loose or damaged

Answer

The operating system has a bug causing high power drain

Answer

The mainboard's charging IC is malfunctioning

Question 4

A user has an old iPhone with a cracked screen that is still fully functional and responsive. The user wants to transfer all data, settings, and apps to a brand new iPhone as quickly and easily as possible without using a computer or internet backup. Both iPhones are running the latest iOS version and are placed close together. Which of the following methods should the user choose?

Accepted Answer

Use Apple Quick Start to migrate directly from the old iPhone to the new one. Apple Quick Start uses a direct peer-to-peer Wi-Fi connection (and optionally a wired connection via Lightning-to-USB adapter) to transfer all data, settings, and apps from the old iPhone to the new one without requiring a computer or internet backup. Since both devices are running the latest iOS and are placed close together, this method meets the user's requirement for a fast, computer-free, and internet-free migration.

Answer

Perform an iCloud backup on the old phone and restore from that backup on the new phone

Answer

Connect the old iPhone to a Mac and use Finder to create a backup, then restore that backup on the new iPhone

Answer

Use a third-party app to copy contacts and photos to the new phone

Question 5

A user reports that their Android smartphone's battery drains much faster than usual after a recent system update. The phone is two years old and has been working normally until now. The user has already restarted the device. Which of the following should the technician recommend FIRST?

Accepted Answer

Check for updates to installed apps. After a system update, app compatibility issues or background processes can cause excessive battery drain. Checking for app updates ensures that apps are optimized for the new OS version, as outdated apps may use more CPU or keep the device awake unnecessarily. This is the least invasive and most logical first step before considering hardware replacement or disabling core features.

Answer

Perform a factory reset

Answer

Replace the battery

Answer

Disable location services

Question 6

A user reports that their Android smartphone's battery drains very quickly after a recent app update. The user has already checked battery usage statistics and found that no app is using an unusually high amount of power. The phone is less than a year old. Which of the following should the technician recommend FIRST?

Accepted Answer

Boot the phone into safe mode and observe battery life.. Safe mode disables all third-party applications, allowing the technician to determine if a recently updated app is causing the battery drain without interference from other user-installed software. Since the battery usage statistics showed no single app consuming excessive power, the issue could be a cumulative effect or a background process that safe mode isolates. This is the least invasive and most targeted first step before considering more drastic measures like a factory reset.

Answer

Perform a factory reset.

Answer

Replace the battery.

Answer

Update the operating system to the latest version.

Question 7

A user reports that their Android smartphone's touchscreen is unresponsive. The user performed a factory reset, but the problem persists. The technician notices that the screen has several deep scratches but no cracks. Which of the following is the MOST likely cause?

Accepted Answer

Failed digitizer. The digitizer is the component responsible for detecting touch input on a smartphone screen. Deep scratches can physically damage the digitizer's conductive layer, causing unresponsiveness even though the display (LCD) itself may still function. A factory reset cannot repair physical damage, so the problem persists, confirming a hardware failure in the digitizer.

Answer

Corrupted firmware

Answer

Dead pixels

Answer

Damaged LCD

Question 8

A user reports that their Bluetooth headphones no longer connect to their smartphone after an operating system update. The headphones work normally when paired with a different smartphone. Other Bluetooth devices, such as a smartwatch, still connect to the user's phone without issues. Which of the following should the user try FIRST?

Accepted Answer

Forget the device and re-pair it. The most common cause of Bluetooth connectivity failure after an OS update is a corrupted or mismatched pairing profile. Forgetting the device removes the old profile from the smartphone's Bluetooth stack, forcing a fresh pairing handshake that re-establishes the correct encryption keys and service discovery. This is the first-line troubleshooting step before more invasive or time-consuming actions.

Answer

Reboot the smartphone

Answer

Reset network settings on the smartphone

Answer

Update the firmware on the Bluetooth headphones

Question 9

A user notices that the back cover of their Android smartphone is slightly bulging and the screen is lifting from the frame. The phone still turns on and functions normally. Which of the following actions should the technician recommend FIRST?

Accepted Answer

Power off the phone and replace the battery. The bulging back cover and screen lifting indicate a swollen lithium-ion battery, which is a critical safety hazard. The correct first action is to power off the phone immediately to prevent electrical short circuits or thermal runaway, and then replace the battery to eliminate the risk of fire or explosion.

Answer

Place the phone in a freezer to reduce swelling

Answer

Continue using the phone but monitor the swelling daily

Answer

Use a clamp to press the screen back into place

Question 10

A user reports that their Android smartphone can make and receive phone calls, but cannot send or receive text messages (SMS/MMS) after a recent operating system update. The user has verified that the mobile data connection is working, and the messaging app is not blocked. Which of the following is the MOST likely cause of this issue?

Accepted Answer

The SMS center number settings are incorrect.. The SMS center number (SMSC) is a critical parameter stored on the SIM card that routes outgoing text messages through the carrier's SMSC server. After an OS update, this setting can be reset or corrupted, preventing SMS/MMS transmission while voice calls and mobile data remain functional because those services use separate network paths. Correcting the SMSC number restores SMS functionality without affecting other services.

Answer

The SIM card is not properly inserted.

Answer

The phone is not connected to a Wi-Fi network.

Answer

The messaging app is corrupted.

Question 11

A user reports that their Android smartphone's screen is shattered and the lower half of the touchscreen is unresponsive. The phone is locked with a PIN, and the user urgently needs to retrieve photos from the internal storage. The user does not want to spend money on repairs if possible. Which of the following is the BEST method to retrieve the data?

Accepted Answer

Use a USB OTG adapter to connect a wired mouse. A USB OTG (On-The-Go) adapter allows you to connect a wired mouse to the Android smartphone. Once connected, the mouse cursor can navigate the locked screen, enter the PIN, and access the internal storage without requiring the broken touchscreen to function. This method is cost-free (assuming the user has or can borrow an OTG adapter and mouse) and does not involve any repair or data loss.

Answer

Connect the phone to a computer via USB cable and access the files using MTP

Answer

Replace the phone's screen digitizer

Answer

Perform a factory reset to restore touch functionality

Question 12

A technician is replacing a cracked screen on an Android smartphone. After reassembling the device, the phone powers on successfully and the display shows the lock screen with the correct time and background image. However, the touchscreen does not respond to any taps or swipes. The technician has verified that the replacement screen is compatible with the phone model. Which of the following should the technician check FIRST?

Accepted Answer

Reseat the digitizer ribbon cable connector on the motherboard. The touchscreen not responding while the display works correctly indicates a problem with the digitizer, not the LCD. The digitizer ribbon cable connects the touch sensor to the motherboard; if it is loose or improperly seated after reassembly, the touchscreen will not register input. Reseating this connector is the logical first step before considering other components or software resets.

Answer

Reconnect the LCD display cable

Answer

Replace the smartphone battery

Answer

Perform a factory reset from the recovery menu

Question 13

A user reports that their Android smartphone's volume rocker button is physically stuck in the pressed position. The phone is still functioning, but the volume constantly decreases to zero and cannot be adjusted. Which of the following is the BEST first step?

Accepted Answer

Remove the phone case and clean around the button with compressed air. A stuck physical button on a smartphone is often caused by debris, such as dust or lint, lodged around the button, or by a case that is pressing against it. The best first step is to remove any case and gently clean around the button with compressed air. Factory reset and firmware reflash are software solutions that cannot fix a physical obstruction. Replacing the display assembly is unnecessary and costly for a button issue.

Answer

Perform a factory reset

Answer

Replace the display assembly

Answer

Reflash the firmware

Question 14

A user's iPhone is stuck on the Apple logo during startup and will not complete the boot process. The user has already performed a force restart (press and release Volume Up, then Volume Down, then hold the Side button) multiple times without success. Which of the following should the user do NEXT to resolve this issue?

Accepted Answer

Restore the device using iTunes or Finder. A force restart bypasses a temporary software hang, but if the iPhone remains stuck on the Apple logo, the boot process is failing due to a corrupted operating system or critical system file. Restoring the device via iTunes or Finder (or the Finder equivalent on macOS Catalina and later) reflashes the iOS firmware, replacing the damaged system partition and allowing the device to boot cleanly. This is the standard next step after a force restart fails to resolve a boot loop or startup freeze.

Answer

Replace the battery

Answer

Update the carrier settings

Answer

Perform a hard reset by holding the Home button and the Power button simultaneously

Question 15

A user reports that their smartphone, which uses a Lightning connector, will not charge at all. The phone powered off overnight and will not turn back on. The user has tried three different known-good charging cables and two known-good wall adapters, none of which work. The technician inspects the phone's charging port and notices it appears clean and undamaged. Which of the following is the MOST likely cause of the issue?

Accepted Answer

The Lightning port has internal pin damage that is not visible. The Lightning connector uses internal pins that can be damaged or bent without visible external signs. Since the user has verified that the cables and wall adapters are known-good, the issue is isolated to the phone's charging port. Internal pin damage would prevent electrical contact even though the port appears clean, making this the most likely cause.

Answer

The battery is completely depleted and needs to be replaced

Answer

The charging IC (Integrated Circuit) on the motherboard has failed

Answer

The phone's operating system has corrupted and needs to be restored