CompTIA A+ Core 1 Domain 1: Mobile Devices

USB PD 3.1 EPR adds 28 V, 36 V, and 48 V fixed voltages enabling 140 W, 180 W, and 240 W, so it can supply the 130 W laptop over USB-C.

• ATrap of confusing the old SPR ceiling with EPR; standard PD before 3.1 tops out at 100 W (20 V/5 A), which is below 130 W.
• CNames a legacy dedicated-charging-port spec capped near 7.5 W; it predates Power Delivery negotiation and cannot supply laptop-class wattage at all.
• DConfuses a data-throughput standard (40 Gbps) with a power standard; USB4 defines transfer rates, not the voltage/current profiles that authorize 130 W charging.

Thunderbolt 4 always delivers 40 Gbps over USB-C and its certification requires support for two 4K displays or one 8K display, matching the stated needs.

• ATrap of picking a fast-sounding USB tier; USB 3.2 Gen 2 caps at 10 Gbps and does not guarantee dual-4K video, so it misses both certified minimums.
• BNames a pure video link on the wrong connector; Mini DisplayPort is not the USB-C form factor the scenario requires and carries no general 40 Gbps data role.
• DConfuses a TV/monitor video standard with a USB-C data port; HDMI uses its own connector and is a one-way A/V link, not a 40 Gbps multipurpose port.

USB Power Delivery provides flexible power along with data over a single cable, and the same connector supports alternate modes/Thunderbolt that carry video.

• BTrap that confuses USB-C with a barrel power jack; the spec was designed to deliver power along with data over the same single cable.
• CIgnores alternate modes; the connector can tunnel DisplayPort/Thunderbolt video, which is exactly how single-cable docks drive monitors.
• DConfuses the connector shape with a fixed protocol; speed depends on the implementation (USB 2.0 up to USB4/Thunderbolt), not the USB-C shape alone.

A Thunderbolt dock provides multiple downstream ports plus laptop charging over a single cable, with certification requiring PC charging on at least one computer port.

• BTrap of equating any hub with a dock; a passive USB-A hub adds USB ports only and cannot drive multiple displays or deliver charging power to the laptop.
• CNames a device for sharing one keyboard/monitor/mouse among several computers, not for expanding one laptop's ports or charging it over a single cable.
• DConfuses wireless networking gear with wired port expansion; an access point provides RF connectivity and cannot supply monitors, Ethernet pass-through, or charging.

NFC is a contactless technology at 13.56 MHz with a typical range of only a couple of centimeters, and its card-emulation mode backs contactless payment.

• ATrap of substituting a longer-range PAN radio; BLE operates at 2.4 GHz with up to ~100 m range and is not the tap-to-pay card-emulation transport.
• CConfuses a WLAN data band with proximity payments; Wi-Fi covers tens of meters and is used for networking, not for a deliberate near-contact tap.
• DNames an obsolete optical link requiring aimed line of sight; modern phones use inductively coupled NFC, not infrared, for contactless payment.

Class 1 radios transmit at up to 100 mW (20 dBm), the highest standard power class, making about 100 m range achievable in open air.

• ATrap because Class 2 is the most common phone/earbud class but reaches only about 10 m, far short of the 100 m the scenario requires.
• BNames the lowest-power class limited to roughly 1 m; it is used for very-short-range accessories, not a 100 m link.
• DInvents a tier that is not part of the standard Bluetooth power-class scheme of Class 1, 2, and 3, so it is a distractor with no defined range.

Bluetooth LE, introduced with 4.0, is designed and optimized for low-duty-cycle applications such as fitness and medical sensors that send a few bytes intermittently.

• ATrap because BR/EDR is optimized for continuous high-throughput links such as audio streaming, drawing far more power than a coin-cell sensor can sustain for months.
• BNames a high-data-rate streaming mode for headsets and speakers; its always-on radio is the opposite of a low-duty-cycle sensor design.
• CConfuses a peer-to-peer WLAN technology with Bluetooth; Wi-Fi Direct consumes much more power and is not the SIG's low-energy sensor radio.

Wi-Fi 6E extends the Wi-Fi 6 (802.11ax) standard into the newly opened 6 GHz band; such radios are typically tri-band with dedicated 2.4, 5, and 6 GHz radios.

• BTrap that confuses 6 GHz with 60 GHz (802.11ad/ay); Wi-Fi 6E adds the 6 GHz spectrum, not the much higher 60 GHz band.
• CConflates Wi-Fi with cellular; Wi-Fi 6E remains an IEEE 802.11 WLAN technology and does not adopt 3GPP's 5G radio.
• DNames a wired technology; the 'E' in Wi-Fi 6E refers to extended wireless spectrum, not any change to wired Ethernet cabling or ports.

3GPP standardizes the cellular generations; the 5G system is defined from Release 15, functionally frozen in June 2018, building on 4G LTE.

• BTrap that swaps the WLAN body for the cellular body; 802.11 governs Wi-Fi, whereas 3GPP defines LTE and 5G NR.
• COverstates one band; 5G NR includes sub-6 GHz ranges as well as mmWave, so a mmWave-only claim is false.
• DNames a misconception; 3GPP 5G still uses a SIM/USIM (the eSIM is the only platform that secures 5G access per 3GPP), not IP-based identity.

Cloud sync stores the data centrally and, when both devices sign in to the same account, an edit made on one device is reflected on the others.

• ATrap that assumes only tethered sync; cloud synchronization propagates changes over the network without a physical cable between the two devices.
• CNames an invented mechanism; Bluetooth does not mirror contact databases, and synchronization is handled by the cloud account, not screen capture.
• DDescribes the no-sync state; if sync is off or accounts differ, changes stay local, which is exactly the opposite of the behavior described.

OLED is a self-luminous technology in which each pixel directly emits light; with no backlight it can be thinner and switch individual pixels fully off.

• ATrap that describes an LED-backlit LCD; OLED has no backlight at all, so 'a stronger backlight' contradicts the technology's defining trait.
• BNames the legacy backlight of older LCDs; OLED pixels self-illuminate, so no CCFL or other separate lamp is present.
• DConfuses an LCD sub-type with OLED; IPS is still a backlit liquid-crystal panel, whereas OLED uses self-emitting organic materials, not liquid crystals.

Bluetooth is a short-range radio whose supported applications include audio streaming to headphones, earbuds, and speakers across typical room distances.

• BTrap that picks another short-range radio, but NFC's range is only a couple of centimeters and suits tap-to-pair/payment, not continuous room-scale audio.
• CConfuses a wide-area carrier network with a personal audio link; cellular connects to towers and is not used to bind local headphones to a laptop.
• DNames a one-way satellite positioning receiver that provides location data only; it cannot transmit audio to a peripheral at all.

This matches the stated lithium-ion benefits and is why the chemistry is the industry standard for portable electronics, balancing weight, runtime, and charge speed.

• AThis is the unlimited-cycle myth; manufacturers state rechargeable cells have a limited number of charge cycles and capacity fades, so 'unlimited' is plainly wrong.
• CThis describes the nickel-based memory effect, not lithium-ion, which needs no deep-discharge conditioning and can be topped up at any charge level.
• DThis confuses single-use primary alkaline cells with rechargeable lithium-ion packs that are designed to be recharged hundreds of times before service.

Vendors state laptops use SODIMM, a smaller module than the desktop DIMM, sized specifically to fit the limited interior space inside a notebook.

• ADesktops use the full-size DIMM, which is physically too long for a notebook slot, so ordering one for a laptop guarantees it will not fit the chassis.
• BAn LGA package is a processor, not memory; confusing the CPU socket with a RAM slot leads to ordering the wrong component entirely for the upgrade.
• DM.2 2280 is an SSD storage form factor, not system memory; swapping these confuses persistent storage with the volatile RAM being upgraded.

Vendor documentation credits IPS in-plane crystal alignment for wide viewing angles and consistent off-axis color, exactly what collaborative color work requires.

• BThis mixes OLED, which has no backlight, with twisted-nematic wording and describes no real panel while misattributing the wide-angle advantage of IPS.
• CTN trades viewing angle and color accuracy for fast response; claiming it has the widest angles inverts the well-known weakness of twisted-nematic panels.
• DBrightness in nits is unrelated to viewing angle; the off-axis color stability comes from crystal alignment, not the luminance of the backlight.

Nits equal candela per square meter, the unit vendors and VESA use to rate how much light a display actually emits at peak.

• ARefresh rate is expressed in hertz, not nits, so reading a nits value as a refresh figure confuses two entirely different display metrics.
• BPixel density uses pixels-per-inch, not nits; conflating brightness with resolution sharpness misreads exactly what the rated number measures.
• CContrast ratio is a unitless figure such as 1000:1, whereas nits measure emitted luminance, so this names the wrong display characteristic.

Vendors define refresh rate in hertz as redraws per second, and more redraws reduce motion blur, which is why scrolling looks smoother.

• AColor depth is measured in bits or millions of colors, not hertz; raising the refresh rate adds no colors, so this misdefines the spec.
• CBrightness is measured in nits, not hertz, so tying luminance to the redraw frequency confuses two unrelated and independent display metrics.
• DClock speed in gigahertz describes the chip, not the screen; the panel's refresh rate is a display property independent of CPU frequency.

Microsoft and Apple document dedicated fingerprint readers (Hello and Touch ID) that authenticate a user from a stored fingerprint instead of a typed password.

• AA TPM stores keys but has no sensor and cannot read fingerprints, so attributing the actual ridge scan to the TPM module is incorrect.
• BAn IR camera performs face recognition, not fingerprint capture, so this answer swaps the two distinct Windows Hello biometric methods.
• DA color webcam cannot enroll a fingerprint; only a dedicated capacitive or optical sensor, not a photo, can perform fingerprint authentication.

Apple TrueDepth and Windows Hello use infrared imaging plus projected dots to map facial geometry, working in darkness and resisting simple photo spoofing.

• AA 2-D color photo can be spoofed and fails in darkness, so secure face unlock needs depth or infrared imaging rather than just an RGB picture.
• BA fingerprint reader senses ridge patterns, not faces, and cannot perform facial recognition, so this conflates two separate biometric sensors.
• CAn ambient-light sensor only gauges brightness for auto-dimming; it captures no facial geometry and therefore cannot authenticate any individual.

Microsoft and Samsung describe sharing the internet connection over Wi-Fi by default, letting nearby devices connect just like they would to any Wi-Fi network.

• BA hotspot is inherently wireless, so requiring an Ethernet cable contradicts its purpose and ignores the Wi-Fi network it broadcasts for client devices.
• CNFC works only within centimeters for brief data exchanges and cannot carry an ongoing internet session for a tablet, so it is unsuitable here.
• DLegacy IrDA is obsolete and line-of-sight only, whereas modern hotspots broadcast over Wi-Fi radio rather than an infrared light beam.

Apple and Samsung state Personal Hotspot uses the device's cellular data connection to create a temporary, portable Wi-Fi network for other devices.

• ACached content is not a live internet feed; a hotspot must share an active network link, not previously downloaded data sitting on the phone.
• BA hotspot shares the phone's own cellular data, not some other Wi-Fi network, so assuming a relayed public hotspot misstates the actual source.
• DBattery power charges devices but is never an internet source, so conflating electrical power with a data connection is fundamentally incorrect.

Samsung and Apple note a hotspot requires a carrier that supports tethering and may incur extra fees or count usage against the data cap.

• AVendors warn that tethering consumes the plan's data and may add charges, so assuming it is always free risks unexpected overage fees on the trip.
• CThe laptop joins the phone's hotspot over Wi-Fi and needs no SIM of its own; the phone supplies the single cellular link to the carrier.
• DHotspots can even share a connection over Bluetooth, so disabling it is unnecessary and entirely unrelated to the carrier's tethering billing rules.

Microsoft and Apple describe a VPN providing a more secure, encrypted connection to the corporate network from public places such as a coffee shop.

• BA hotspot only shares internet access; it does not tunnel into a private company network or guarantee corporate-grade encryption of the session.
• CAirplane mode disables the wireless radios and provides no connection at all, let alone a secure path to reach internal company servers.
• DNFC works only at a few centimeters and cannot reach a remote server, making it completely unsuited to secure network tunneling.

Apple and Samsung document active pens with pressure and tilt sensitivity that vary line weight from a light touch to a firmer, deeper press.

• AA passive stylus only registers a touch location and contains no sensors to report pressure, so the resulting line weight stays a uniform width.
• BA mouse cannot sense pen pressure against the glass, and substituting a scroll wheel does not deliver natural pressure-driven stroke variation.
• CAn on-screen keyboard types characters and has nothing to do with drawing pressure or stylus input rendered on the display surface.

Microsoft and Apple state the platform fuses GNSS or GPS with Wi-Fi, cellular, and IP signals to determine the device's location.

• AA MAC address identifies a network interface and contains no geographic coordinates, so it cannot on its own reveal where a device physically is.
• BLocation services also draw on Wi-Fi access points, GPS satellites, and IP data, so claiming a voice call is the sole source is simply wrong.
• DAirplane mode disables the radios; although GPS may be re-enabled afterward, the claim that the mode is required for a satellite lock is false.

Apple and Samsung state airplane or flight mode turns off the cellular, Wi-Fi, and Bluetooth radios to halt radio-frequency signal transmission.

• AAirplane mode only disables the radios; the device stays powered on and offline apps still work, so describing it as completely off is incorrect.
• CAirplane mode disables the cellular radio entirely, so it cannot possibly boost a signal that it has just switched off for the flight.
• DAirplane mode toggles wireless radios, not storage encryption, so it has no effect whatsoever on protecting data already at rest on the device.

Vendors note laptops embed a camera and microphone in the bezel so a user can make video calls, take photos, and use voice features without add-ons.

• BSpeakers only output sound and cannot capture the microphone audio a meeting needs, so they do not substitute for an actual microphone.
• CA fingerprint sensor authenticates a touch and has no imaging capability, so it cannot provide a webcam feed for a video call.
• DAn infrared proximity sensor only detects presence or distance; it neither records video nor captures audio for a conferencing session.

Apple and Dell document lithium-(ion) polymer packs as a flexible-form lithium chemistry used in slim tablets and modern thin laptops.

• ALi-poly is a rechargeable lithium chemistry, not a single-use alkaline cell, so calling it disposable directly contradicts its rechargeable design.
• BLi-poly is a lithium chemistry without the nickel-cadmium memory effect, so equating the two misidentifies the battery's real charging behavior.
• CLithium-ion polymer is a legitimate variant that vendors ship in newer thin devices, so the polymer label is not evidence of a fake battery.

DisplayPort uses the Alt Mode functional extension of USB-C to route native DisplayPort audio/video over the connector's high-speed lanes, exactly the documented mechanism.

• AThis invents an analog VGA conversion inside the port; USB-C carries digital DisplayPort over its existing high-speed lanes, and nothing physically rewires the connector to VGA.
• CThis conflates a short-range wireless radio with a wired cable link; Bluetooth lacks the bandwidth for a display and is unrelated to USB-C video transport.
• DThis imagines a graphics processor inside a passive cable; rendering happens on the laptop's own GPU and the cable merely carries the DisplayPort signal it produces.

This is exactly how Qi magnetic induction works: a transmitter coil's changing field induces a voltage in the receiver coil to charge the battery.

• AThis describes a contact/pogo-pin charger, not Qi; inductive pads transfer power across an air gap with no exposed conductors touching the phone at all.
• BThis is optical power transfer, not magnetic induction; Qi never uses light or solar cells and would not work through an opaque phone case or back.
• DThis confuses far-field radio with near-field Qi induction; the cellular antenna is for data, and Qi relies on closely coupled coils, not broadcast radio.

Magnetic attachment aligns the device and charger coils precisely, which improves coupling efficiency and enables faster, more reliable charging than loose placement.

• BThis wrongly claims long-range power; Qi remains a near-field coil technology, and the magnets only fix alignment at contact, not transmission range over distance.
• CThis misstates the design; the magnets surround the coil and do not replace it, since induction between coils is still what actually transfers the power.
• DThis confuses magnetic attachment with a physical port; an attached MagSafe charger is still wireless induction, not a wired USB-C Power Delivery contract.

A wireless wide area network module is the internal cellular modem; with a SIM and an active carrier plan it connects the laptop to 4G/5G networks.

• AThis swaps the acronyms; a WLAN card handles local Wi-Fi only, whereas cellular carrier data requires the separate wireless wide area network module.
• BThis is nonsense hardware repurposing; SO-DIMMs are system RAM and cannot act as a radio, and adding memory never grants cellular connectivity.
• CThis confuses a storage form factor with a modem; mSATA is a legacy SSD interface for data and carries no cellular networking function whatsoever.

A physical sliding cover blocks the lens entirely, so no software or malware can capture video while it is closed, giving a hardware-level guarantee.

• AThis still allows recording; reducing resolution degrades quality but the camera keeps capturing, so it provides no real guarantee against covert video capture.
• BThis relies on aiming and is easily defeated; the camera remains fully functional and could capture the room the moment the laptop is moved.
• DThis overstates a software action; uninstalling a driver is reversible by software and does not physically cut power, so it offers weaker assurance than a cover.

A microlouver privacy filter limits the viewing angle so the screen looks dark from the sides while remaining clear to the user sitting directly in front.

• BThis inverts the goal; anti-glare film cuts reflections but does not restrict who can see the content, so neighbors could still read the screen.
• CThis conflates eye comfort with privacy; reducing blue light addresses eye strain and does nothing to narrow the viewing angle or block side viewers.
• DThis misstates the function; a clear glass protector guards against scratches and impacts but keeps the image fully visible from every angle, not just head-on.

A matte anti-glare surface diffuses incoming light so reflections are scattered rather than mirrored back, making the screen easier to read under bright lighting.

• AThis targets the wrong layer; reflections come from the outer surface finish, and OLED versus IPS changes pixel technology, not whether the glass reflects light.
• BThis is a fabricated mechanism; refresh rate governs how often frames update and has no effect on how the surface reflects ambient light or glare.
• CThis misattributes optics to pixel density; higher resolution sharpens the image but does not change the glossy surface that produces the mirror-like reflections.

Mobile High-Definition Link is an older wired interface that shares the device's micro-USB connector to output HD video to an MHL-enabled HDMI input.

• AThis describes wireless mirroring like Miracast or AirPlay; MHL is a wired standard that sends video over a physical cable, not a radio link.
• CThis reverses the timeline; MHL is the older, largely retired standard, and modern phones moved to USB-C with DisplayPort Alt Mode instead of MHL.
• DThis omits its core purpose; MHL was created specifically to carry HD audio and video to a display, while also optionally charging the device.

After the password, the authenticator app supplies a push approval or a time-based one-time passcode as the second factor proving the user's identity.

• AThis describes passwordless sign-in, not two-factor; with 2FA the password is still entered and the phone adds a second, separate proof of identity.
• BThis confuses disk encryption with authentication; the authenticator app verifies a sign-in, it does not encrypt the computer's files or act as storage.
• DThis misframes 2FA as auto-login; the point is to add a verification step the user must actively complete, increasing security rather than removing prompts.

The digitizer sits over the LCD and converts finger or pen contact into digital coordinates; if it breaks the image still shows but touch stops working.

• AThis misassigns the role; an inverter powers older backlights and has nothing to do with touch input, which is handled by the digitizer layer.
• BThis blames system RAM for an input fault; memory problems cause crashes or no boot, not a working display that simply ignores touch.
• CThis invents a shared path; the Wi-Fi antenna handles radio only, and touch coordinates travel from the digitizer, not the wireless antenna cable.

Finger touch uses a capacitive layer sensing the body's charge, while pressure and tilt from an active pen require a built-in active digitizer the touch-only model lacks.

• AThis blames power capacity; pen pressure sensing is a sensing-hardware feature, and battery wattage does not determine whether a panel can interpret stylus input.
• BThis conflates input sensing with rendering; drawing the line uses the existing GPU, while detecting pen pressure and tilt depends on the digitizer layer.
• CThis invents a wireless data path; an active pen communicates with the panel's digitizer, not over Wi-Fi, so network speed is irrelevant to pen input.

A 2-in-1 is designed to combine laptop productivity with tablet flexibility, using a detachable or folding keyboard and a touchscreen for both roles.

• AThis overstates a clamshell; a standard laptop's hinge and keyboard stay attached and it usually lacks touch, so it cannot truly act as a flat tablet.
• CThis misdescribes e-readers; they use slow monochrome e-ink for reading, lack a real keyboard, and are unsuited to office typing or color sketching.
• DThis ignores portability; a desktop tower is not mobile and cannot become a handheld tablet just by attaching a touch monitor to it.

A detachable 2-in-1 separates the keyboard entirely so the screen becomes a standalone tablet, unlike a convertible whose keyboard stays attached and folds back.

• AThis contradicts the scenario; the Surface Pro keyboard clearly detaches, so describing it as a soldered, non-removable keyboard is simply incorrect.
• BThis mislabels the device; the Surface Pro has a removable keyboard and a touchscreen, which is the opposite of a fixed-keyboard non-touch ultrabook.
• DThis describes the convertible Galaxy Book, not the Surface Pro, and a folding hinge that never detaches is the opposite of the Surface Pro's removable keyboard.

The top row defaults to special features, and holding Fn temporarily sends the standard function key, so Fn plus the key produces the plain F5 the app expects.

• AThis calls for needless hardware swapping; the behavior is configurable in software, so the existing keyboard can send standard F-keys without replacement.
• BThis is drastic and wrong; the top-row default is a configurable setting, not a permanent firmware lock requiring a full operating-system reinstall.
• DThis invents a power dependency; the key's dual behavior is governed by the Fn modifier and a setting, not by whether the AC adapter is connected.

Laptops map screen brightness down and up to specific function-row keys marked with a sun icon, which is the standard keyboard method to dim or brighten the display.

• BThis invents a mapping; Caps Lock and Num Lock toggle text and keypad modes and are not the standard keys for adjusting display brightness.
• CThis misassigns the arrow keys; left and right arrows move the cursor and are not the recognized brightness controls on laptop keyboards.
• DThis describes no real shortcut; pressing Ctrl and Alt alone does not change brightness, which is handled by the dedicated sun-icon function keys.

USB-C carrying DisplayPort Alt Mode is backward compatible with VGA using a plug adapter, so a USB-C to VGA adapter bridges the laptop to the projector.

• AThis wrongly declares it impossible; USB-C with DisplayPort Alt Mode supports backward compatibility to VGA through an adapter, so the connection is achievable.
• CThis mixes incompatible connectors; an Ethernet cable and RJ45 plug do not fit or function in a VGA port and carry no analog video signal.
• DThis expects software to bridge a physical connector gap; a driver cannot make USB-C fit a VGA cable, which still requires a physical adapter.

The WWAN module needs a SIM with an active carrier subscription to authenticate and join the cellular network, which resolves the 'SIM not found' state.

• AThis invents a storage requirement; cellular network attachment depends on a SIM and carrier credentials, not on adding any additional internal drive.
• BThis ties radio attachment to processing power incorrectly; the WWAN modem registers using a SIM and carrier account, not a particular CPU speed.
• DThis conflates Wi-Fi with cellular; a Wi-Fi dongle reaches local hotspots and plays no role in a WWAN modem registering on a carrier's cellular tower.

Microlouvers block light at off-axis angles and absorb part of the on-axis light too, transmitting only a fraction of the panel's brightness toward the user.

• BThis invents an electrical drain; a privacy filter is a passive optical film that connects to nothing and does not tap or reduce the backlight's power.
• CThis blames a software change; a stick-on film cannot alter the brightness slider, and the scenario states the display settings did not change.
• DThis claims hardware damage; a removable optical film does not harm the backlight, and the dimming is simply reduced light transmission, not progressive LED decay.

Thunderbolt supports daisy-chaining up to six devices over a single cable connection, so each peripheral connects to the previous one in a series from the one host port.

• AThis swaps a wireless radio for a wired bus; Thunderbolt chaining is a physical cable connection between devices, and Wi-Fi Direct cannot carry storage or display traffic between them.
• BThis misstates a KVM's purpose; a keyboard-video-mouse switch shares one set of peripherals across multiple computers and does not daisy-chain devices off one port.
• DThis confuses USB topology with Thunderbolt; plain USB uses a star layout through a hub and cannot daisy-chain devices one after another the way Thunderbolt does.

An embedded eSIM lets a supported phone digitally store a carrier-provided profile, commonly activated by scanning a QR code, so no physical SIM card has to be inserted.

• BThis confuses removable storage with subscriber identity; a microSD card holds files and media and cannot authenticate the phone onto a carrier's cellular network.
• CThis describes a physical card, the opposite of the scenario; the plan arrives as a digital QR code precisely so there is no card to mail, cut, or insert.
• DThis misframes the technology; Wi-Fi calling rides on top of an existing carrier line, whereas an eSIM is the digital subscriber profile the plan is loaded into.

Manufacturer guidance says to stop using the device immediately, discharge and power it off, avoid puncturing it, and have the swollen battery replaced by a qualified technician.

• AThis ignores a clear hazard; a swollen lithium-ion cell does not shrink with more charge cycles, and continued use risks further case damage or a fire.
• BThis applies dangerous pressure to the cell; squeezing or compressing a swollen battery can rupture it, and the gas-filled pouch will simply expand again anyway.
• CThis is explicitly unsafe; puncturing a lithium-ion battery can cause it to vent toxic gas, ignite, or explode, which is exactly what guidance warns against.

NFC operates at very short range and an NFC record can carry Bluetooth pairing information, so a tap tells the phone to pair with the speaker automatically.

• AThis misattributes the tap to infrared; IR needs an unobstructed light path and is not what passes Bluetooth pairing data when a phone touches an accessory.
• CThis invents a role for satellite positioning; GPS only estimates location and plays no part in exchanging pairing keys between a nearby phone and speaker.
• DThis sends a local tap on a needless detour; pairing two adjacent devices happens directly over NFC and Bluetooth, not by way of the cellular carrier.

A USB-C-to-USB-A adapter or cable connects the rectangular legacy drive to the slimmer USB-C port, since USB-C remains compatible with the older USB device.

• AThis wrongly declares it impossible; USB-C is designed to interoperate with the existing USB ecosystem, so a simple adapter or cable bridges to legacy USB-A storage.
• BThis invents a wireless path; a USB flash drive has no radio, must be physically connected, and USB-C does not turn drives into Bluetooth devices.
• DThis expects software to alter a physical connector; firmware cannot change a port's shape, and bridging the two connectors requires a physical adapter.

A Wi-Fi + Cellular tablet includes a cellular modem and SIM, so it can connect directly to mobile data networks where no Wi-Fi is available, unlike a Wi-Fi-only unit.

• BThis assumes hardware that is not present; a Wi-Fi-only tablet has no cellular radio or SIM, so it simply goes offline when no Wi-Fi network is reachable.
• CThis overstates Bluetooth; it is a short-range link for accessories and cannot by itself reach the internet from a remote site without another connection.
• DThis conflates runtime with connectivity; a bigger battery lasts longer but provides no cellular radio, so it does nothing to get the tablet online off Wi-Fi.

An M.2 NVMe solid-state drive is the small gumstick board that seats in an M.2 slot and runs the NVMe protocol over the PCIe bus for high performance.

• AThis names a bulky mechanical desktop drive; a 3.5-inch platter unit would never fit a thin laptop and uses SATA, not the small PCIe gumstick board described.
• BThis confuses RAM with storage; a SO-DIMM is volatile system memory in a different slot and cannot serve as a persistent PCIe storage drive.
• CThis describes a disc reader, not a circuit board; an optical drive is a large tray mechanism and is absent from thin laptops that use M.2 storage.

4K UHD measures 3840 x 2160, which doubles both the width and height of Full HD's 1920 x 1080 and therefore holds four times the total pixel count.

• AThis denies the higher pixel count; 4K UHD has many more pixels than Full HD, not the same number on a bigger screen, so it can render a sharper image.
• CThis counts only one dimension; both width and height double from Full HD to 4K UHD, so the total pixel count quadruples rather than merely doubling.
• DThis confuses resolution with refresh rate; 3840 x 2160 states the pixel grid, while refresh rate is a separate hertz figure describing how often the screen updates.