220-1101 Mobile Devices Practice Test 7 — 15 Questions

Question 1

A user reports that their smartphone is not vibrating when receiving calls or notifications, even though the vibrate settings are enabled in the sound menu. The ringtone and speaker work normally. Which of the following is the MOST likely cause of this issue?

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

Accepted Answer

The vibration motor is defective or disconnected. The vibration motor is a dedicated hardware component that physically oscillates to create the vibration sensation. If the phone's ringtone and speaker work normally but vibration fails despite the vibrate settings being enabled, the most likely cause is that the vibration motor itself is defective or has become disconnected from the motherboard. Software settings cannot override a failed hardware component.

Answer

Do Not Disturb mode is enabled

Answer

The phone is in silent mode

Answer

A recent software update caused a configuration error

Question 2

A user reports that their smartphone has distorted sound coming from the earpiece speaker during phone calls, but the loudspeaker and headphone jack work normally. The user has already tried turning up the volume and cleaning the earpiece grille. Which of the following is the MOST likely cause?

Accepted Answer

Faulty earpiece speaker. The earpiece speaker is a dedicated hardware component separate from the loudspeaker and audio jack. Since the loudspeaker and headphone jack function normally, the issue is isolated to the earpiece speaker itself, making a faulty earpiece speaker the most likely cause. Cleaning the grille and adjusting volume did not resolve the problem, further supporting a hardware failure rather than a software or connection issue.

Answer

Broken audio jack

Answer

Software audio bug

Answer

SIM card issue

Question 3

A user's smartphone was accidentally dropped into a puddle of water. The user immediately removed the phone from the water and wiped it dry. They are now attempting to power it on, but the phone does not respond. Which of the following should the user do FIRST to maximize the chance of recovery?

Accepted Answer

Place the phone in a bag of uncooked rice for 24-48 hours before trying to power it on. Uncooked rice acts as a desiccant, absorbing residual moisture from the phone's internal components over 24-48 hours. This passive drying process minimizes the risk of short circuits or corrosion when power is applied, which is critical since water can cause conductive paths between circuits even after external wiping.

Answer

Immediately plug the phone into a charger to see if it still works

Answer

Use a hair dryer on high heat to dry the phone quickly

Answer

Press and hold the power button for 10 seconds to force a reset

Question 4

A user's smartphone has a cracked screen. The display still shows 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. The phone is not rooted, and no prior backup software was configured. Which of the following methods is the MOST reliable and complete way to back up the data in this situation?

Accepted Answer

Use a USB On-The-Go (OTG) adapter to connect a mouse to the phone, navigate to enable USB file transfer, then connect to a computer via USB cable.. A USB OTG adapter allows connecting a mouse to the smartphone, enabling cursor control to navigate the touch interface. This lets the user access settings to enable USB file transfer mode (MTP), after which a computer can read the phone's storage for a full backup of contacts, photos, and app data. Since the screen is cracked but functional, and the phone is not rooted, this method provides complete control without requiring prior backup software.

Answer

Connect the phone to a computer using a USB cable; the computer should automatically detect it as a mass storage device, allowing file access.

Answer

Remove the SIM card and any microSD card, then connect the phone to a computer via USB to access internal storage directly.

Answer

Put the phone in a bag of rice to dry it out, then connect to a computer via USB, as the moisture may block the touch input.

Question 5

A user accidentally spills coffee over their smartphone. They immediately pick it up and wipe the exterior. The phone is still powered on and functioning, but the touchscreen is not responding correctly in the area where the liquid was spilled. Which of the following should the user do FIRST to prevent further damage?

Accepted Answer

Power off the phone and remove the battery if possible.. Powering off the phone and removing the battery (if possible) immediately stops electrical current from flowing through the device, which prevents short circuits and electrochemical corrosion caused by the conductive and corrosive nature of coffee. This is the first and most critical step to mitigate damage to the motherboard and other internal components.

Answer

Place the phone in a bag of uncooked rice for 24 hours.

Answer

Use a hairdryer on high heat to dry the phone.

Answer

Continue using the phone and hope it dries out naturally.

Question 6

A user's laptop powers on (fans spin, power LED on), but the built-in display remains black. The technician connects an external monitor to the laptop's video port, and the external monitor displays the desktop correctly. Which of the following is the MOST likely cause?

Accepted Answer

The LCD panel or backlight has failed. The laptop powers on (fans spin, power LED on) but the built-in display remains black, while an external monitor connected to the video port works correctly. This indicates that the GPU and video driver are functional, as they are able to drive the external display. The most likely cause is a failure of the LCD panel itself or its backlight (e.g., a faulty LED backlight, inverter, or display cable), since the internal display is the only component not working.

Answer

The laptop's video driver is corrupt

Answer

The RAM is faulty

Answer

The battery is not charging

Question 7

A user accidentally drops their smartphone into a saltwater pool. They retrieve it within seconds and wipe the exterior dry. The phone is still powered on, but the screen is flickering and the touchscreen is unresponsive. Which of the following should the user do FIRST to maximize the chance of successful recovery?

Accepted Answer

Power off the phone immediately. Powering off the phone immediately (B) is the correct first step because saltwater is highly conductive and corrosive. Even after wiping the exterior, residual moisture and salt ions inside the device can cause short circuits and electrochemical corrosion that rapidly damage internal components. Cutting power stops the flow of current through the wet circuits, minimizing the risk of permanent damage and giving the user the best chance of successful recovery through proper drying.

Answer

Place the phone in a bag of uncooked rice to absorb moisture

Answer

Connect the phone to a charger to see if it will respond

Answer

Use a hair dryer on high heat to dry the phone quickly

Question 8

A user's smartphone has a cracked screen. The display is still visible, but the touch input is only partially responsive. The user needs to perform a factory reset to erase personal data before selling the device. The user can see the 'Reset' button on the screen but cannot tap it due to the unresponsive area. Which of the following methods would be the MOST effective way to perform the factory reset?

Accepted Answer

Connect a USB mouse via an OTG adapter to navigate the interface and tap the reset button.. An OTG (On-The-Go) adapter allows connecting a USB mouse directly to the smartphone, enabling precise cursor control. This bypasses the unresponsive touch area, letting the user navigate to and tap the 'Reset' button without needing functional touch input on that portion of the screen.

Answer

Use the volume buttons and power button to navigate the recovery menu to perform a factory reset from recovery mode.

Answer

Use the manufacturer's online account portal (e.g., Find My Device) to remotely wipe the device.

Answer

Install a third-party backup app that can initiate a factory reset from the app's settings.

Question 9

A user dropped their smartphone and the touchscreen is now completely unresponsive. The display shows the home screen normally, the device powers on, and physical buttons (power, volume) work. The user has already performed a forced restart (holding power and volume down) but the touchscreen remains unresponsive. The device is not backed up, and the user needs to recover data before sending it for repair. Which of the following is the NEXT best step?

Accepted Answer

Use an external mouse via USB-OTG. Using an external mouse via USB-OTG (On-The-Go) bypasses the broken digitizer by sending touch input through the USB host controller, allowing the user to navigate the phone and initiate data transfer. Since the display and system are functional, this method enables data recovery without repair or data loss.

Answer

Connect the phone to a computer and use file management software to extract data

Answer

Replace the digitizer assembly

Answer

Perform a factory reset from recovery mode

Question 10

A user reports that their smartphone does not vibrate even though the vibrate mode is enabled in settings. The phone was accidentally dropped onto a hard floor two days ago. The screen is not cracked, and the phone still rings and displays notifications. The user has already tried restarting the phone and toggling the vibrate setting. Which of the following is the MOST likely cause?

Accepted Answer

The vibrate motor is loose or disconnected. The most likely cause is that the vibrate motor is loose or disconnected. The smartphone was dropped, and the vibrate motor is a physical component that can become dislodged or have its electrical connection disrupted by impact. Since the phone still rings and displays notifications, the audio and display subsystems are functional, isolating the issue to the vibration mechanism.

Answer

The operating system has a software bug that disables vibration after a drop

Answer

The loudspeaker is damaged

Answer

The vibration setting is controlled by a third-party app that was corrupted

Question 11

A user reports that their smartphone (Android) turns off without warning when the battery indicator shows 15-20% remaining. The phone will not power back on until it is connected to a charger, at which point it shows a much lower battery percentage (e.g., 2%). The user has already performed a battery calibration procedure (draining fully and charging to 100% uninterrupted) but the problem persists. Which of the following is the MOST likely cause?

Accepted Answer

Defective battery. The battery is defective because it has lost its ability to accurately report its state of charge and maintain voltage under load. When the battery indicator shows 15-20%, the actual voltage has already dropped below the cutoff threshold, causing the phone to shut down. The calibration procedure failed because the battery's internal impedance has increased, preventing it from holding a proper charge.

Answer

Faulty charging port

Answer

Operating system software bug

Answer

Loose connection between the battery and motherboard

Question 12

A user's Android tablet is running low on internal storage. A microSD card has been inserted and formatted as portable storage. The user wants to move some applications to the microSD card to free up space, but the 'Move to SD card' option is grayed out for many apps. Which of the following is the MOST likely reason for this?

Accepted Answer

B. The apps are pre-installed system apps.. Pre-installed system apps are typically stored in a protected system partition that cannot be moved to external storage. Android restricts moving these apps to ensure system stability and security, as they are integral to the device's operation. The grayed-out 'Move to SD card' option indicates that the app's manifest or Android's policy prevents relocation.

Answer

A. The microSD card is not a Class 10 speed card.

Answer

C. The tablet requires a factory reset to enable app moving.

Answer

D. The microSD card is configured as internal storage.

Question 13

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?

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 14

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 15

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