220-1101 Mobile Devices Practice Test 5 — 15 Questions

Question 1

A technician is repairing a smartphone with a cracked digitizer but a functional LCD. The technician needs to safely separate the digitizer from the LCD without causing further damage. Which tool is most appropriate for this task?

Accepted Answer

Spudger (plastic opening tool). The digitizer is the touch-sensitive layer on top of the LCD. To separate it without damaging the underlying LCD, a plastic spudger is used because it is non-conductive, non-marring, and thin enough to gently pry the adhesive bond between the layers. Metal tools or hammers would shatter the glass or puncture the LCD.

Answer

Phillips head screwdriver

Answer

Soldering iron

Answer

Claw hammer

Question 2

A technician needs to remove a swollen lithium-ion battery from a laptop before performing further repairs. Which of the following is the most critical safety step to take before beginning the removal?

Accepted Answer

Disconnect the AC adapter and remove the battery from the laptop while powered off. Disconnecting the AC adapter and powering off the laptop ensures that no electrical current is flowing to the system, eliminating the risk of a short circuit or electrical shock when handling a damaged lithium-ion battery. A swollen battery is chemically unstable and can rupture or ignite if disturbed while the system is still powered or connected to a charger. This step is the most critical because it directly addresses the immediate electrical hazard before any physical manipulation of the battery.

Answer

Fully discharge the battery by running the laptop until it shuts down

Answer

Use a metal spudger to gently pry the battery out of its compartment

Answer

Place the removed battery in a sealed plastic bag for disposal

Question 3

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?

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

Answer

The battery is not fully seated

Answer

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

Question 4

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

Answer

Defective display assembly

Answer

Weak cellular signal

Question 5

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. Option C is correct because 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

Answer

Update the device's operating system to the latest version

Question 6

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

Answer

Iris scanner

Answer

PIN code

Question 7

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

Answer

A can of compressed air

Answer

Isopropyl alcohol and a cotton swab

Question 8

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 9

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

Answer

The condition of the charging port

Answer

The brightness of the screen

Question 10

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

Answer

A corrupt operating system

Answer

A damaged LCD display

Question 11

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

Answer

B. Continue using the phone but avoid charging it

Answer

D. Puncture the battery to release the gas

Question 12

A user's iPhone is not receiving any cellular signal. The technician confirms that Airplane Mode is off, the device is not in a low-signal area, and the SIM card is properly inserted and not damaged. Which of the following should the technician try FIRST?

Accepted Answer

Reset network settings. Resetting network settings clears cellular and Wi-Fi configurations without affecting personal data, often resolving software-related signal issues. Changing the SIM card or performing a hard reset are more drastic steps. Updating carrier settings is less common as a first step.

Answer

Insert a different SIM card

Answer

Perform a hard reset

Answer

Update carrier settings

Question 13

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 14

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 15

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.. The correct answer is C because 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.

Answer

The display has failed completely.

Answer

The screen timeout is set to a very short duration.

Answer

The power button is stuck in the pressed position.