220-1101 Mobile Devices Practice Test 6 — 15 Questions

Question 1

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?

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

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.

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LCD panel

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Battery

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Motherboard

Question 2

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.

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Whether the SIM card is inserted properly

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The condition of the charging port

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The brightness of the screen

Question 3

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.

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A failing battery

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A corrupt operating system

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A damaged LCD display

Question 4

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.

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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 5

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.

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Compressed air

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A metal paperclip

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A cotton swab with alcohol

Question 6

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.

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Back up to the cloud and restore on the new phone

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

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Transfer contacts and photos via Bluetooth

Question 7

A user reports that their smartphone's screen remains dark when they press the power button, but they can hear incoming calls and notifications. The phone is fully charged. Which of the following is the most likely cause?

Accepted Answer

The proximity sensor is blocked.. A blocked proximity sensor is a common cause of a dark screen during calls. The proximity sensor detects when the phone is near the user's ear and turns off the display to prevent accidental touches. If the sensor is blocked (e.g., by a case, screen protector, or debris), the phone may incorrectly believe it is against the ear and keep the screen off even when the power button is pressed.

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The display has failed completely.

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The screen timeout is set to a very short duration.

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The power button is stuck in the pressed position.

Question 8

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.

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

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Use an OTG cable to connect a mouse.

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

Question 9

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.

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Replace the battery.

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Perform a hard reset.

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Boot into safe mode.

Question 10

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.

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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 11

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.

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Failing battery

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Corrupted operating system

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Faulty digitizer

Question 12

A user's smartphone with a removable battery begins to randomly shut down and restart. The technician notices that the battery percentage jumps erratically. Which of the following is the most likely cause?

Accepted Answer

The battery is worn out and needs replacement. The erratic battery percentage jumps and random shutdowns are classic symptoms of a worn-out lithium-ion battery that can no longer hold a stable charge. As the battery ages, its internal resistance increases and its voltage sags under load, causing the device's power management IC to misread the remaining capacity and trigger unexpected shutdowns. Replacing the battery restores stable voltage output and accurate fuel gauge reporting.

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The operating system requires an update

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The SIM card is loose

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The screen is malfunctioning

Question 13

A user's smartphone has a cracked screen that is still displaying images, but the touch input is completely unresponsive. The user needs to back up all data (contacts, photos, app data) before sending the phone for repair. Which method is the MOST reliable and complete way to back up the data in this situation?

Accepted Answer

Connect a USB mouse via an OTG cable to control the phone and perform a backup. With a cracked screen that is unresponsive to touch but still displays images, the only way to interact with the phone is through an external input device. Connecting a USB mouse via an On-The-Go (OTG) cable allows the user to navigate the phone's interface and manually initiate a full backup (e.g., to a computer or cloud service) without relying on the broken touchscreen. This method provides complete control over the backup process, ensuring all data types (contacts, photos, app data) can be selected and transferred.

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Use a computer and connect the phone via USB, then use file explorer to copy data

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Press the volume and power buttons to enter recovery mode and perform a backup

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Rely on cloud backup if the phone is configured to auto-backup

Question 14

A user reports that their smartphone is running very slowly and the battery drains significantly faster than usual, even when the screen is off. The technician notices that the phone feels warm to the touch. Which of the following is the MOST likely cause of these symptoms?

Accepted Answer

Too many apps are running in the background.. When a smartphone feels warm, runs slowly, and drains battery quickly even with the screen off, the most likely cause is excessive background app activity. Background apps consume CPU cycles and keep the processor active, generating heat and draining the battery. This is a classic symptom of runaway background processes rather than a hardware failure or simple settings issue.

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The screen brightness is set too high.

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The operating system needs to be updated.

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The battery is failing and needs to be replaced.

Question 15

A user's Android smartphone will not charge when plugged into the wall charger. The technician has already verified the charger and cable work with another phone, cleaned the charging port with compressed air, and performed a soft reset. Which of the following should the technician try NEXT?

Accepted Answer

Check the charging port for compacted debris with a flashlight and non-conductive tool. Since the charger and cable are verified working and a soft reset has been performed, the most likely remaining issue is physical debris deep inside the charging port that compressed air alone could not dislodge. Using a flashlight and a non-conductive tool (e.g., plastic or wooden pick) allows the technician to safely inspect and remove compacted debris without shorting the port's pins, which is a common cause of intermittent or failed charging on Android devices.

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Replace the battery

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Replace the charging port assembly

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Perform a factory reset