Mobile Devices 15% Flashcards
A customer’s cell phone screen is discolored in several areas. Which of the following components is the MOST likely cause of the issue?
a. Bulging battery
b. Wired connectors
c. Liquid crystal display
d. Phone case
e. Protective glass
c. Liquid crystal display
Correct Answer:
Liquid Crystal Display (LCD): The LCD is responsible for displaying images on the phone screen. Discoloration often indicates issues within the LCD itself, such as dead or stuck pixels, uneven backlighting, or damage to the layers.
Incorrect Options:
A. Bulging Battery: While a bulging battery can cause various problems, it typically doesn’t lead to screen discoloration unless there’s leakage damaging the LCD, which is less common.
B. Wired Connectors: Issues with wired connectors would likely cause connectivity or intermittent problems rather than directly affecting the screen’s appearance.
D. Phone Case: A phone case protects the device but doesn’t usually impact the screen’s functionality unless it exerts pressure or causes damage.
E. Protective Glass: Damage to protective glass typically results in scratches rather than widespread screen discoloration, which suggests issues with the underlying LCD.
A laptop does not have any audio output from the built-in speakers. The Windows Device Manager shows a down arrow for the audio device.
Which of the following will correct this audio issue?
A. Replacing the speakers
B. Increasing the volume
C. Enabling the audio device
D. Updating the driver
D. Updating the driver
If Device Manager shows a down arrow on the audio device, it likely means there’s a driver issue. Updating the driver can fix compatibility problems, bugs, or corruption causing the audio issue.
Here’s why the other options don’t address the problem:
A. Replacing the speakers: This only helps if the speakers are physically damaged. Since the down arrow indicates a device issue, it’s best to start with software troubleshooting.
B. Increasing the volume: Low volume or muted sound can be fixed by adjusting volume, but the down arrow shows there’s a bigger issue than volume settings.
C. Enabling the audio device: Enabling the device might help, but the down arrow suggests a driver problem, so updating the driver is the more complete solution.
The IT department issued a corporate smartphone to a user, but the user returned the device stating it had connectivity issues. The user claimed the device functioned on Wi-Fi, but all connectivity to cloud services was lost as soon as the device was taken off site.
Which of the following issues was MOST likely affecting the device?
A. MDM was never properly set up on the device.
B. S/MIME certificates were corrupted and needed to be reloaded.
C. Bluetooth on the device was disabled by mistake.
D. The device never had a proper SIM card installed.
D. The device never had a proper SIM card installed.
If a device loses cloud access off-site but has Wi-Fi, it likely relies solely on Wi-Fi for internet. This may mean the device lacks a working SIM card, preventing cellular connectivity outside the office.
Incorrect choices:
A. MDM setup issues: Poor MDM setup might cause access restrictions, but it wouldn’t solely prevent off-site connectivity.
B. S/MIME certificates: S/MIME certificates affect email security, not general internet connectivity.
C. Bluetooth disabled: Bluetooth is for short-range connections and doesn’t impact internet or cloud access.
Which of the following handles touch-screen operation on a mobile device?
A. Stylus
B. Liquid crystal display
C. Processor
D. Digitizer
D. Digitizer
A digitizer detects and interprets touch input on a touch screen, converting taps, swipes, and other gestures into digital signals the device can process.
Incorrect choices:
A. Stylus: A stylus interacts with the screen but doesn’t process touch input; that’s the digitizer’s role.
B. LCD: The LCD displays visuals but doesn’t handle touch input.
C. Processor: The processor runs tasks but doesn’t directly handle touch input, which is managed by the digitizer.
To control costs, a company provides a limited number of users with company phones. One of these users opens a support ticket because the phone no longer allows Internet browsing over a cellular connection. The user acknowledges that the phone worked before the user’s child streamed several movies using the device.
Which of the following describes why the phone cannot browse the internet?
A. The child accidentally connected to a neighbor’s WLAN.
B. The company’s group policy disabled the device.
C. The device has a data cap and has reached that limit.
D. The device’s plan has been unpaid.
C. The device has a data cap and has reached that limit.
The user’s inability to browse the internet over a cellular connection after streaming several movies suggests that the device’s data limit has been reached. Many cellular plans have data caps, and exceeding them can result in throttled speeds or blocked data until the next billing cycle.
Here’s why other options are less relevant:
Connected to neighbor’s WLAN: Connecting to a neighbor’s WLAN wouldn’t affect cellular browsing capability.
Company’s group policy disabled the device: A group policy restriction would likely affect more than just cellular browsing.
Unpaid plan: Unpaid bills would suspend service entirely, not just limit browsing after heavy usage.
A user is expecting a visit from a new customer, and the company’s ADSL link has suddenly gone down.
Which of the following should the user do to access a smartphone’s 4G internet connection from the laptop?
A. Set up a VPN.
B. Configure a hotspot.
C. Activate NFC.
D. Use a USB cable.
B. Configure a hotspot.
Configuring a hotspot on the smartphone allows it to share its 4G data connection with other devices, like a laptop, by creating a Wi-Fi network that the laptop can join to access the internet.
Here’s why the other options are incorrect:
Set up a VPN: A VPN provides secure internet access but doesn’t enable connection to a smartphone’s 4G network.
Activate NFC: NFC is used for short-range data transfers, such as contactless payments, and won’t share internet.
Use a USB cable: While USB tethering can share a connection, it’s less flexible than a hotspot for wireless access.
A technician is setting up a laptop with an encrypted hard drive. The laptop will securely store a PIN that the user will input at log-on.
Which of the following must be installed to set up this configuration?
A. TPM
B. HSM
C. UEFI
D. ARM
A. TPM (Trusted Platform Module)
A TPM (Trusted Platform Module) is a hardware component that securely stores cryptographic keys, such as those for hard drive encryption. In this scenario, the TPM stores the user’s log-on PIN, protecting encryption keys from unauthorized access and enhancing overall system security.
Here’s why the other options are incorrect:
B. HSM (Hardware Security Module): HSMs are used for cryptographic operations and key management in enterprise environments, not typically for securing PINs on individual laptops.
C. UEFI (Unified Extensible Firmware Interface): UEFI replaces BIOS and offers enhanced features, but it is not specifically required for configuring encrypted hard drives with secure PIN storage.
D. ARM (Advanced RISC Machine): ARM refers to a processor architecture and is not directly related to the encryption or secure storage of PINs on a laptop.
A user visits the help desk to report that a smartphone takes more than a day to fully charge. The user already tested multiple wall outlets and swapped the charging cable, but the results are the same.
Which of the following should the technician do FIRST?
A. Verify the power rating of the charger.
B. Ensure all unnecessary connectivity features are disabled.
C. Check that all missing smartphone OS updates are applied.
D. Complete a factory reset of the phone.
A. Verify the power rating of the charger.
If the smartphone charges slowly despite using different outlets and cables, the charger’s power output might be inadequate. Verifying the charger’s power rating should be the first troubleshooting step.
Now, let’s look at the incorrect choices:
B. Ensure all unnecessary connectivity features are disabled: While this may optimize power usage, it’s not the first step for troubleshooting slow charging, which is more likely due to the charger.
C. Check that all missing smartphone OS updates are applied: While important for overall performance, OS updates are not directly related to slow charging, which usually involves hardware issues.
D. Complete a factory reset of the phone: A factory reset is a last resort and should only be considered after other troubleshooting steps, as slow charging typically relates to hardware or power problems.
In which of the following places is a laptop’s wireless antenna MOST likely located?
A. Near the network interface card
B. Underneath the battery
C. Integrated into the motherboard
D. In the bezel of the lid
D. In the bezel of the lid
In most laptops, the wireless antenna is typically located in the bezel of the lid, near the display. This positioning allows for optimal signal reception and transmission, ensuring clear communication with access points or routers.
Now, let’s discuss why the other options are incorrect:
A. Near the network interface card: While the network interface card (NIC) contains the wireless components, the antenna is usually located in the lid bezel, not near the NIC.
B. Underneath the battery: This area typically houses components like the hard drive or cooling system and is not where the wireless antenna is placed.
C. Integrated into the motherboard: Although some laptops may have antennas on the motherboard, this is less common. Antennas in the lid bezel provide better wireless performance due to improved signal reception and transmission.
A new employee has been issued a company laptop. The employee requests an accessory with a single power source that has wired network connectivity and supports a keyboard, mouse, speakers, and dual monitors.
Which of the following accessories should the systems administrator deploy to BEST meet the new user’s needs?
A. PoE switch
B. USB-C hub with power delivery
C. Docking station with DisplayPort
D. KVM switch with audio
C. Docking station with DisplayPort
A docking station with DisplayPort connectivity is the best choice for the new user because it offers:
Wired Network Connectivity: Ethernet ports for a stable connection.
Peripheral Support: Multiple USB ports for a keyboard, mouse, and speakers.
Dual Monitor Capability: Supports connecting two monitors.
Single Power Source: Charges the laptop while connecting peripherals.
Incorrect Options:
A. PoE Switch: Provides power and network but lacks dual monitor and peripheral support.
B. USB-C Hub with Power Delivery: Offers USB ports and power but may not support dual monitors.
D. KVM Switch with Audio: Manages multiple computers but typically doesn’t support dual monitors and is not for a single laptop.
A user reports the touch screen on an Android smartphone is not responding to any input. The technician has cleared the cache, restarted the phone, and ensured the phone is fully charged. The issue still persists.
Which of the following should the technician replace on the phone to MOST likely resolve the issue?
A. System on a chip
B. Accelerometer
C. Digitizer
D. Gyroscope
C. Digitizer
If a smartphone’s touch screen is unresponsive even after clearing the cache, restarting, and charging, the digitizer—the component that detects touch—is likely at fault. Replacing it should restore touch functionality.
Incorrect Options:
A. System on a chip (SoC): The SoC manages essential functions but rarely causes isolated touch issues.
B. Accelerometer: This sensor detects motion, not touch input.
D. Gyroscope: Similar to the accelerometer, it detects rotation, not touch input, so it’s unrelated to screen responsiveness.
Which of the following types of devices MOST often uses a Thunderbolt cable?
A. Linux PC
B. Android mobile
C. Apple laptop
D. Chromebook
C. Apple laptop
Thunderbolt, developed by Intel and Apple, is a high-speed interface commonly found on Apple devices like MacBook Pro and iMac. Thunderbolt cables connect compatible devices, such as external drives and displays, to Apple laptops.
Why the Other Options Are Incorrect:
A. Linux PC: While some Linux PCs support Thunderbolt, it’s far more common on Apple devices.
B. Android mobile: Android devices typically use USB Type-C, not Thunderbolt.
D. Chromebook: Chromebooks generally use USB Type-C; Thunderbolt support is rare on these devices.
A user reports a cell phone is getting hot.
Which of the following are MOST likely to be possible causes? (Choose three.)
A. Using the device as a Wi-Fi hotspot
B. A cracked screen
C. A failing battery
D. Less than 15% free storage space on the phone
E. Privileged control
F. Recurring prompts to install OS updates
G. Granting too many application camera permissions
H. Too many open applications
A. Using the device as a Wi-Fi hotspot
C. A failing battery
H. Too many open applications
Most Likely Causes of Overheating:
Using the device as a Wi-Fi hotspot: Sharing internet via hotspot requires simultaneous use of Wi-Fi and mobile data, which strains the device’s radio components and generates heat.
A failing battery: As batteries degrade, they become less efficient, producing more heat during use.
Too many open applications: Multiple apps increase CPU and RAM load, causing the device to heat up.
Why the Other Options Are Less Likely:
A cracked screen: Affects physical integrity but doesn’t directly cause overheating.
Low storage space: May impact performance but isn’t a primary cause of overheating.
Privileged control: Could lead to overheating through improper modifications, but this is rare.
Recurring OS update prompts: Annoying but not directly linked to overheating.
Excessive camera permissions: A privacy concern but unlikely to cause heat unless a specific app overuses CPU.
A user entered a help desk ticket stating the latest calendar updates have not appeared on the user’s corporate mobile device for several days, even though updates do appear on the user’s laptop.
Which of the following actions will MOST likely enable calendar alerts?
A. Checking that the ringer volume on the device is high enough to be audible
B. Ensuring the corporate password is saved correctly in the calendar application
C. Installing a third-party calendar application and synchronizing it with the corporate calendar
D. Remotely wiping the mobile device and reinstalling all applications
B. Ensuring the corporate password is saved correctly in the calendar application
The best solution is ensuring the corporate password is saved correctly in the calendar app to fix the synchronization issue. If the password is incorrect or outdated, updates won’t sync to the mobile device.
Here’s why the other options are less effective:
A. Checking the ringer volume: This only affects audible notifications, not the syncing issue.
C. Installing a third-party app: Adds complexity and may not address the root cause.
D. Wiping the device: Excessive and disruptive; should only be a last resort.
n end user discovered that the touch-screen features on a Windows device have stopped working.
Which of the following should a technician check?
A. Performance monitor
B. Tablet/PC settings
C. System configuration
D. Display settings
b. Tablet/PC settings
The correct answer is checking the Tablet/PC settings. These settings directly control how the touch-screen interface operates, including enabling and configuring the touch functionality. Ensuring that these settings are correct can resolve the issue of the touch screen not working.
Here’s why the other options are not the best choices:
a. Performance monitor: This tool tracks system performance metrics like CPU and memory usage. It is not relevant to troubleshooting touch-screen functionality, as it doesn’t address input device issues.
c. System configuration: This is used for managing startup and boot settings. While it could impact overall system behavior, it doesn’t directly affect touch-screen functionality, so it’s not the first place to check.
d. Display settings: While the display settings control screen resolution and orientation, they don’t directly impact the touch-screen functionality. The problem is more likely related to tablet/PC settings that manage touch interaction.
