220-1101 Mobile Devices Practice Test 6 — 15 Questions

Question 1

A technician replaces a smartphone's fused screen assembly (LCD + digitizer + glass). After reassembly, the phone powers on and the display shows correctly, but the touchscreen is completely unresponsive. Which of the following is the most likely cause?

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

Accepted Answer

The digitizer cable is not connected. The fused screen assembly includes the LCD, digitizer, and glass. The digitizer is responsible for touch input, and it connects to the motherboard via a separate ribbon cable. If the display works but the touchscreen is unresponsive, the digitizer cable is likely not connected or is loose, as the LCD cable only handles video output.

Answer

The LCD cable is loose

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The battery is not fully seated

Answer

The new screen assembly is incompatible with the phone's OS

Question 2

A user reports that their smartphone's battery drains significantly faster than usual, and the device feels warm to the touch even when it is not being actively used. The battery is not swollen. Which of the following is the MOST likely cause of these symptoms?

Accepted Answer

Background app malfunction causing high CPU usage. A background app malfunction causing high CPU usage forces the processor to draw more power, generating excess heat even when the device is idle. This directly explains both the rapid battery drain and the warmth, as the CPU remains active without user interaction.

Answer

Faulty charging port

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Defective display assembly

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Weak cellular signal

Question 3

A user reports that their smartphone's battery drains significantly faster than usual, and the device feels warm to the touch even when idle. The battery is not swollen. Which of the following should the technician do FIRST to diagnose the issue?

Accepted Answer

Check the battery usage per application in the device settings. The first step in diagnosing rapid battery drain and overheating is to check the battery usage per application in the device settings. This allows the technician to identify if a specific app is consuming excessive CPU resources or keeping the device awake abnormally, which is a common cause of heat generation and battery depletion even when idle. Replacing the battery or performing a factory reset without first checking app-level power consumption is premature and may not address the root cause.

Answer

Replace the battery with a new OEM battery

Answer

Perform a factory reset of the device

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Update the device's operating system to the latest version

Question 4

A technician is setting up a new smartphone for a user. The user wants to be able to unlock the phone using their face. Which of the following biometric authentication methods should the technician configure?

Accepted Answer

Facial recognition. Facial recognition uses the front-facing camera to capture and analyze unique facial features, such as the distance between the eyes and the shape of the cheekbones, to authenticate the user. This is the correct biometric method for unlocking a smartphone with the user's face, as it directly matches the requirement.

Answer

Fingerprint scanner

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Iris scanner

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PIN code

Question 5

A user reports that their smartphone will not charge when connected to a known-good charger and cable. The technician examines the charging port and sees debris inside. Which of the following tools should the technician use to safely remove the debris?

Accepted Answer

A wooden toothpick. A wooden toothpick is non-conductive and non-abrasive, making it safe to dislodge debris from a smartphone charging port without risking short circuits or damaging the delicate pins inside the USB-C or Lightning connector. Metal tools can cause electrical shorts or scratch the port's contacts, while compressed air may push debris deeper, and alcohol with a cotton swab can leave fibers or moisture that interfere with charging.

Answer

A metal paperclip

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A can of compressed air

Answer

Isopropyl alcohol and a cotton swab

Question 6

A user dropped their smartphone and now the touchscreen is completely unresponsive, although the display appears normal and the phone powers on and receives calls. Which of the following components is most likely damaged?

Accepted Answer

Digitizer. The digitizer is the component responsible for converting touch input into electrical signals. When the display appears normal but the touchscreen is unresponsive, the digitizer layer is the most likely damaged component, as the LCD panel (which handles image rendering) and other system components are functioning correctly.

Answer

LCD panel

Answer

Battery

Answer

Motherboard

Question 7

A user reports that their smartphone cannot detect any Bluetooth devices. The technician has verified that Bluetooth is enabled in the settings, and the other Bluetooth devices are powered on and in discoverable mode. Which of the following should the technician check next?

Accepted Answer

Whether the smartphone is in Airplane mode. Airplane mode disables all wireless radios, including Bluetooth, Wi-Fi, and cellular. Even if Bluetooth is toggled on in settings, enabling Airplane mode overrides this and prevents the Bluetooth radio from transmitting or scanning, so the smartphone cannot detect any Bluetooth devices. The technician should verify that Airplane mode is off before proceeding with other troubleshooting steps.

Answer

Whether the SIM card is inserted properly

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The condition of the charging port

Answer

The brightness of the screen

Question 8

A user reports that their smartphone's touchscreen is unresponsive along the left edge but works fine elsewhere. The technician has already performed a soft reset and checked for screen protectors or debris. Which of the following is the most likely cause?

Accepted Answer

A malfunctioning digitizer. The digitizer is the layer responsible for converting touch input into electrical signals. A partial failure along the left edge indicates a localized digitizer malfunction, as the LCD display and operating system are unaffected. Soft reset and debris checks rule out software or physical obstruction issues, isolating the hardware digitizer as the most likely cause.

Answer

A failing battery

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A corrupt operating system

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A damaged LCD display

Question 9

A user's smartphone battery is bulging and the back cover is popping off. Which of the following should the user do FIRST?

Accepted Answer

C. Power off the phone and remove the battery if possible, then dispose of it properly. A bulging battery indicates a critical failure in the lithium-ion cell, often caused by internal short circuits or overcharging that generate gas from electrolyte decomposition. The immediate priority is to power off the device to stop current flow and remove the battery (if possible) to prevent thermal runaway, fire, or rupture. Proper disposal is required because the damaged cell is hazardous and cannot be safely recharged or reused.

Answer

A. Place the phone in a freezer to reduce swelling

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B. Continue using the phone but avoid charging it

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D. Puncture the battery to release the gas

Question 10

A user reports that their smartphone will not charge. A technician inspects the charging port and notices debris inside the port. Which of the following tools should the technician use to safely clean the debris?

Accepted Answer

A wooden toothpick. A wooden toothpick is non-conductive and non-abrasive, making it safe to dislodge debris from the charging port without damaging the delicate pins or shorting the connector. Compressed air can push debris deeper, metal objects risk scratching or shorting contacts, and cotton swabs may leave fibers or moisture behind.

Answer

Compressed air

Answer

A metal paperclip

Answer

A cotton swab with alcohol

Question 11

A user's smartphone has a cracked screen but the display and touch still function. The user wants to transfer all data, including contacts, photos, and app settings, to a new phone of the same brand. Which method would be MOST efficient and complete?

Accepted Answer

Use the manufacturer's migration app on both phones. The manufacturer's migration app (e.g., Samsung Smart Switch, Google Pixel Migrate) is designed to transfer all data—including contacts, photos, app settings, and even home screen layouts—over a direct Wi-Fi or wired connection. This method is the most efficient and complete because it captures app data and system settings that cloud backups or file copies often miss, and it works without needing the cracked screen to be fully usable for complex operations.

Answer

Back up to the cloud and restore on the new phone

Answer

Copy files to a microSD card and insert it into the new phone

Answer

Transfer contacts and photos via Bluetooth

Question 12

A user's smartphone has a cracked screen that is still partially functional, but the touch input does not work in the cracked area. The user wants to back up all data before taking it for repair. Which method would be MOST reliable to back up the data if the screen is unresponsive?

Accepted Answer

Use a cloud backup service that was previously enabled.. If a cloud backup service (e.g., iCloud, Google Drive, Samsung Cloud) was previously enabled and configured to back up automatically, the user can restore the data after the repair without needing any screen interaction. This method does not require the touchscreen to be functional, as backups occur in the background over Wi-Fi. It is the most reliable approach when the screen is unresponsive and no prior wired connection was established.

Answer

Connect the phone to a computer via USB and use file explorer.

Answer

Use an OTG cable to connect a mouse.

Answer

Use the phone's recovery mode to perform a full backup.

Question 13

A user's smartphone will not charge when connected to the charger. The technician has verified that the charger and cable work with another phone, and the charging port appears clean and free of debris. Which of the following should the technician try FIRST?

Accepted Answer

Use a wireless charger if supported.. Since the charger and cable are verified working and the port is clean, the issue is likely with the phone's charging circuitry. Using a wireless charger (if supported) bypasses the physical charging port entirely, isolating whether the problem is with the port or the phone's internal charging system. This is the quickest and least invasive test before attempting more disruptive steps.

Answer

Replace the battery.

Answer

Perform a hard reset.

Answer

Boot into safe mode.

Question 14

A user reports that their smartphone's touchscreen is unresponsive in a small area near the bottom-left corner after dropping the device. The screen is not cracked, and the display still shows images correctly in that area. The technician has already performed a soft reset and verified that no screen protector is interfering. Which of the following is the most likely cause?

Accepted Answer

A. The digitizer layer is damaged. The digitizer layer is the component responsible for detecting touch input. When a smartphone is dropped, the digitizer can sustain localized damage—such as a cracked or delaminated sensor grid—even if the display (LCD/OLED) remains intact and shows images correctly. The unresponsive area in the bottom-left corner, combined with normal image display, points directly to a damaged digitizer rather than the LCD panel.

Answer

B. The LCD panel is cracked internally

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C. The battery is swollen and pressing against the screen

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D. The screen resolution settings are incorrect

Question 15

A user's smartphone has become intermittent: the screen flickers and sometimes goes completely black for a few seconds before returning to normal. The phone has not been dropped recently and there is no visible damage. The technician has already performed a soft reset and the issue persists. Which of the following is the most likely cause?

Accepted Answer

Loose internal display cable. The intermittent screen flickering and blackouts, without physical damage or drop history, strongly point to a loose internal display cable. A soft reset did not resolve the issue, ruling out temporary software glitches. The display cable connects the screen to the motherboard; if it becomes slightly unseated due to thermal expansion or vibration, it can cause intermittent signal loss, leading to the described symptoms.

Answer

Failing battery

Answer

Corrupted operating system

Answer

Faulty digitizer