220-1101 Mobile Devices Practice Test 7 — 15 Questions

Question 1

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?

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

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.

Answer

The operating system requires an update

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The SIM card is loose

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The screen is malfunctioning

Question 2

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.

Answer

The screen brightness is set too high.

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The operating system needs to be updated.

Answer

The battery is failing and needs to be replaced.

Question 3

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.

Answer

Replace the battery

Answer

Replace the charging port assembly

Answer

Perform a factory reset

Question 4

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?

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

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The phone is in silent mode

Answer

A recent software update caused a configuration error

Question 5

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 6

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 7

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 8

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 9

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

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The RAM is faulty

Answer

The battery is not charging

Question 10

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 11

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 12

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 13

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 14

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 15

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.