220-1101 Mobile Devices Practice Test 14 — 15 Questions

Question 1

A user drops their smartphone onto a tile floor. The screen is not cracked and the phone powers on normally. However, the phone can no longer detect any Wi-Fi networks, even though other devices in the same location can. Bluetooth continues to work correctly. Which of the following components is MOST likely damaged?

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

Accepted Answer

The Wi-Fi antenna. The Wi-Fi antenna is a separate physical component from the Bluetooth antenna in many smartphones, even though they often share the same wireless chipset. A drop can break the tiny solder joints or the antenna trace itself, which would prevent the phone from detecting any Wi-Fi networks while leaving Bluetooth functional because Bluetooth uses a different antenna path. Since the phone powers on and the screen is intact, the impact likely damaged only the dedicated Wi-Fi antenna.

Answer

The NFC chip

Answer

The digitizer

Answer

The baseband processor

Question 2

A user reports that their smartphone emits no sound from the bottom speaker (used for speakerphone and media playback). The earpiece works during phone calls, and audio through wired headphones is normal. The volume is turned up and the phone is not in silent mode. The technician has verified that the software audio settings are correct. Which of the following components is MOST likely faulty?

Accepted Answer

Bottom speaker. The bottom speaker is the dedicated transducer for speakerphone and media playback audio. Since the earpiece (top speaker) and wired headphone output both work correctly, the audio codec and signal path are intact up to the bottom speaker's amplifier or voice coil. A failure of the bottom speaker itself—such as an open voice coil, torn diaphragm, or corroded contacts—would selectively silence only that output while leaving all other audio paths functional.

Answer

Audio codec chip

Answer

Battery

Answer

Proximity sensor

Question 3

A user drops a tablet onto a hard floor. The display still shows images and colors correctly, but the touchscreen is completely unresponsive in all areas. The technician has rebooted the device and cleaned the screen with a soft cloth. 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. Since the display still shows images correctly (LCD panel is intact) but the touchscreen is completely unresponsive, the digitizer layer has most likely been damaged by the impact.

Answer

LCD panel

Answer

Battery

Answer

System board

Question 4

A user's Android smartphone is running hot to the touch and the battery drains significantly faster than usual, even when the phone is idle. The technician checks the battery health using a diagnostic app, which reports it as 'Good'. The user has not installed any new apps recently. Which of the following is the MOST likely cause of the issue?

Accepted Answer

A background application or system process is consuming excessive CPU resources.. A background application or system process consuming excessive CPU resources is the most likely cause because high CPU usage generates heat and drains the battery rapidly, even when the phone is idle. The diagnostic app reporting battery health as 'Good' rules out a failing battery, and the absence of new app installations suggests a rogue system process or an existing app misbehaving. Android's process management can allow apps to run background services that spike CPU usage without user awareness, leading to thermal and power symptoms.

Answer

The charging port is shorted, causing continuous power draw.

Answer

The power button is stuck in the pressed position, keeping the screen on.

Answer

The device has been infected with malware that mines cryptocurrency.

Question 5

A user reports that a laptop connects to Wi-Fi at home but cannot connect to a corporate docking station's wired network through USB-C. Other peripherals on the dock work. What should the technician check first?

Accepted Answer

Whether the dock's Ethernet driver or firmware is installed and current. The Ethernet function over USB-C requires a dedicated driver or firmware for the docking station's network interface. Since other peripherals (e.g., USB devices, video) work, the USB-C data path is intact, isolating the issue to the Ethernet adapter itself. Checking and updating the dock's Ethernet driver or firmware is the logical first step before any hardware replacement or OS reinstall.

Answer

Disable the wireless adapter permanently

Answer

Replace the laptop display panel

Answer

Reinstall the operating system immediately

Question 6

Drag and drop the steps for configuring a SOHO wireless router into the correct order.

Accepted Answer

1. Connect router to modem and power on. 2. Connect computer to router via Ethernet. 3. Open browser and enter router IP. 4. Log in with default credentials. 5. Change admin password. 6. Configure wireless SSID and security (WPA2). 7. Save settings.. Initial setup begins with physical connections, then accessing the router, securing admin access, configuring wireless settings, and saving.

Answer

1. Connect router to modem and power on. 2. Connect computer wirelessly. 3. Open browser and enter router IP. 4. Log in with default credentials. 5. Configure wireless SSID and security. 6. Save settings. 7. (Skip changing admin password)

Answer

1. Connect router to modem and power on. 2. Connect computer via Ethernet. 3. Open browser and enter router IP. 4. Log in with default credentials. 5. Configure wireless SSID and security. 6. Save settings. 7. Change admin password.

Answer

1. Connect computer to router via Ethernet. 2. Connect router to modem and power on. 3. Open browser and enter router IP. 4. Log in with default credentials. 5. Change admin password. 6. Configure wireless SSID and security. 7. Save settings.

Question 7

Drag and drop the steps for installing a CPU and cooler on a motherboard into the correct order.

Accepted Answer

Insert CPU, apply thermal paste, mount cooler, connect fan.. The correct sequence for installing a CPU and cooler is: insert the CPU into the socket, apply a small amount of thermal paste to the CPU, mount the cooler securely, and then connect the cooler fan to the motherboard. This order ensures proper thermal transfer and avoids damage to components.

Answer

Insert CPU, mount cooler, apply thermal paste, connect fan.

Answer

Apply thermal paste, insert CPU, mount cooler, connect fan.

Answer

Insert CPU, mount cooler, connect fan, apply thermal paste.

Question 8

Match each network protocol to its well-known port number.

Accepted Answer

HTTP: 80. The correct matches are HTTP:80, HTTPS:443, FTP:21, SSH:22, and DNS:53. Common mistakes include swapping ports between HTTP/HTTPS and assigning SSH (port 22) to FTP.

Answer

FTP: 22

Answer

HTTP: 443

Question 9

Match each tool to its primary purpose in PC repair.

Accepted Answer

Multimeter: Measure voltage, resistance, and continuity. The correct matches are: Multimeter measures electrical properties, compressed air removes dust, antistatic wrist strap prevents ESD, and thermal paste improves heat conduction. Common mistakes include confusing the multimeter with compressed air.

Answer

Multimeter: Remove dust from components

Answer

Compressed air: Measure electrical values

Question 10

A user reports that their Android smartphone's touchscreen does not respond to taps or swipes in the lower third of the screen, but works normally everywhere else. The phone has not been dropped or exposed to liquid, and a screen protector is installed. Which of the following is the MOST likely cause?

Accepted Answer

The digitizer is damaged in the lower portion of the display assembly.. The digitizer is responsible for sensing touch input. Damage to a specific area of the digitizer, even without visible cracks, can cause that region to stop responding. Since the issue is isolated to the lower third and there is no other physical damage, a digitizer fault is the most likely cause. Replacing the display assembly is the standard fix.

Answer

The battery is swollen and pressing against the back of the display.

Answer

The phone's operating system needs to be updated to fix a touch driver bug.

Answer

The screen protector is not making proper contact in that area.

Question 11

A technician is configuring a new Android smartphone for a user who travels internationally. The user needs to make calls and use mobile data in Europe. The phone supports GSM and LTE bands but does not support CDMA. Which of the following should the technician verify to ensure the phone will work in Europe?

Accepted Answer

The phone is carrier-unlocked and supports European LTE bands.. For international travel, a phone must be carrier-unlocked to accept a local SIM and must support the cellular bands used in the destination country. Europe uses GSM and LTE bands that may differ from those in the US. Verifying unlock status and band compatibility ensures the phone will work. CDMA is irrelevant, IMEI registration is not standard, and Wi-Fi calling is not a substitute for cellular service.

Answer

The phone's IMEI is registered with the European carrier.

Answer

The phone has a CDMA radio enabled for international roaming.

Answer

The phone's Wi-Fi calling feature is enabled and configured.

Question 12

A user reports that their Android smartphone's battery drains rapidly even when the phone is idle. The technician has already checked for OS updates and verified that no obvious apps are running in the foreground. Which of the following should the technician do next to diagnose the issue? (Choose two.)

Accepted Answer

Check for apps that have background activity or wakelock permissions enabled.. To diagnose rapid battery drain when idle, the technician should first gather data using built-in battery statistics and check for apps with background activity or wakelock permissions. These steps can pinpoint misbehaving apps or settings. Replacing the battery, disabling connectivity, or factory resetting are premature and do not diagnose the root cause.

Answer

Perform a factory reset to eliminate all third-party apps.

Answer

Replace the battery with a new one to rule out battery degradation.

Answer

Disable Wi-Fi and Bluetooth to see if the drain stops.

Question 13

A user wants to transfer photos and videos from their Android smartphone to a Windows laptop using a USB cable. When the phone is connected, it charges but does not appear in File Explorer. The technician confirms the cable and laptop port are functional. Which of the following should the technician do to resolve the issue?

Accepted Answer

Change the USB connection mode on the phone to File Transfer (MTP).. When an Android phone is connected to a computer via USB, it defaults to charging-only mode for security. To transfer files, the user must change the USB connection mode to File Transfer (MTP) or similar. This allows the computer to see the phone's storage. USB debugging, driver installation, or restarting are not the primary fixes for this common issue.

Answer

Enable USB debugging in Developer Options.

Answer

Restart the phone and the laptop to refresh the connection.

Answer

Install the manufacturer's USB drivers on the laptop.

Question 14

A user's Android smartphone has a cracked screen. The display shows the image correctly, but the touchscreen does not respond anywhere. The technician replaces the screen assembly, but after the repair, the touchscreen still does not work. Which of the following is the MOST likely cause?

Accepted Answer

The digitizer connector is not properly seated on the motherboard.. After replacing a screen assembly, if the display works but touch does not, the most likely cause is a loose or improperly connected digitizer cable. The digitizer connector must be firmly seated on the motherboard. A defective screen, OS reinstall, or battery issue are less likely. Reseating the connector is the first troubleshooting step.

Answer

The replacement screen is defective.

Answer

The phone's operating system needs to be reinstalled to recognize the new screen.

Answer

The battery is not providing enough power to the touchscreen.

Question 15

A user's Android phone was dropped and now the screen displays a network of fine cracks that spread across the display, but the touchscreen still responds and the image is visible. The user wants the phone usable again as quickly as possible while preserving the existing data and avoiding a full device replacement. Which of the following should the technician perform?

Accepted Answer

Replace the digitizer and LCD assembly with a compatible screen module.. Because the glass, digitizer, and LCD are laminated together on most modern Android handsets, the correct repair is to replace the complete screen module. This restores full usability and preserves the user's data since storage and mainboard components are not disturbed. Cosmetic coatings, software resets, and accessibility toggles cannot repair fractured glass or the display stack beneath it.

Answer

Enable a screen-protector mode in the accessibility settings to mask the cracks.

Answer

Apply a liquid screen protector to fill the cracks and seal the glass.

Answer

Perform a factory reset to recalibrate the touchscreen after the impact.