CompTIA A+ Core 1 Practice Questions: Mobile Devices

22 free, exam-style CompTIA A+ Core 1 (220-1101) practice questions covering Mobile Devices. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

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Q1. Which mobile device screen technology offers the best color accuracy?

Explanation: OLED (Organic Light-Emitting Diode) displays provide superior color accuracy, deeper blacks, and higher contrast ratios compared to LCD technologies. This makes OLED ideal for high-quality visuals in mobile devices and TVs. Learn more.

Q2. Which mobile device feature allows contactless payments?

Explanation: NFC (Near Field Communication) enables contactless payments like Apple Pay and Google Pay. Learn more.

Q3. Which type of battery is commonly used in laptops?

Explanation: Lithium-ion (Li-ion) batteries are standard in modern laptops due to their energy density. Learn more.

Q4. Which mobile device screen technology offers the best color accuracy?

Explanation: OLED (Organic Light-Emitting Diode) screens offer exceptional color accuracy, deep blacks, and high contrast ratios. Unlike LCDs, OLED pixels emit their own light, allowing for more precise color control and better image quality, especially for high-end smartphones and tablets. Learn more.

Q5. Which of the following methods is commonly used to synchronize data such as contacts, calendars, and photos between a mobile device and a cloud service?

Explanation: Over-the-air (OTA) synchronization allows mobile devices to automatically sync data with cloud services (like iCloud, Google Drive, Outlook.com) over Wi-Fi or cellular data connections without needing a physical cable. Learn more.

Q6. Which display panel type commonly used in laptops offers the widest viewing angles and accurate color reproduction?

Explanation: IPS (In-Plane Switching) panels provide the best viewing angles and color accuracy compared to TN or VA.

Q7. What type of mobile connector is used for both charging and audio output on many modern smartphones?

Explanation: USB-C supports power delivery, audio, video, and data over a single reversible connector.

Q8. Which laptop component’s failure is most likely if the battery gauge freezes at 0% even when plugged in?

Explanation: A faulty battery controller can fail to report charge status even when external power is present.

Q9. Which mobile device component provides power to the LCD or OLED screen for illumination?

Explanation: The inverter (for older LCDs) or the backlight/display controller (for modern LCDs and OLEDs) is responsible for providing the necessary power to illuminate the screen. While OLEDs are self-emissive, they still rely on power management components for brightness control. Learn more.

Q10. Which mobile device feature, if enabled, can help locate a lost smartphone by using GPS, Wi-Fi, and cellular towers?

Explanation: Mobile device location services use a combination of GPS, Wi-Fi, and cellular tower triangulation to determine and share the device's geographical position, which is critical for 'Find My Device' features. Learn more.

Q11. Which mobile device component provides power to the LCD or OLED screen for illumination?

Explanation: The inverter (for older LCDs) or the backlight/display controller (for modern LCDs and OLEDs) is responsible for providing the necessary power to illuminate the screen. While OLEDs are self-emissive, they still rely on power management components for brightness control. Learn more.

Q12. Which mobile device feature, if enabled, can help locate a lost smartphone by using GPS, Wi-Fi, and cellular towers?

Explanation: Mobile device location services use a combination of GPS, Wi-Fi, and cellular tower triangulation to determine and share the device's geographical position, which is critical for 'Find My Device' features. Learn more.

Q13. Which common function of a mobile device's Near-Field Communication (NFC) feature involves quickly establishing a Bluetooth connection between two devices?

Explanation: NFC can be used for 'tap-to-pair' functionality, where two devices touch or come very close to each other to quickly establish a Bluetooth connection, simplifying the pairing process. Learn more.

Q14. Which LCD panel technology typically offers the fastest response times, making it popular for gaming monitors, but often at the expense of viewing angles and color accuracy?

Explanation: TN (Twisted Nematic) panels are known for their fast response times and high refresh rates, which are beneficial for competitive gaming. However, they typically have narrower viewing angles and less accurate color reproduction compared to IPS or VA panels. Learn more.

Q15. A technician needs to connect an older smartphone with a common small rectangular port to a computer for data transfer. Which common USB connector type is MOST likely found on this smartphone?

Explanation: Micro-USB was a very common small rectangular connector for charging and data on Android smartphones and other mobile devices before USB-C became prevalent. Mini-USB was an earlier, slightly larger version. Learn more.

Q16. What is the primary purpose of a Preferred Roaming List (PRL) update on a cellular device, particularly for CDMA networks?

Explanation: A PRL (Preferred Roaming List) update on a cellular device (especially CDMA) contains information about the cellular towers and frequencies the device should prioritize when roaming. Updating it ensures the device connects to the best available network and receives optimal service outside its home coverage area. Learn more.

Q17. A user reports that their laptop's integrated webcam is no longer functioning. Which component is MOST likely to be replaced to resolve this issue?

Explanation: The webcam is a distinct module within a laptop that can be replaced if it fails, assuming the issue isn't software or driver related. Objective 1.1 covers 'Hardware/device replacement' for laptops, including components like webcams. Learn more.

Q18. A mobile device's screen responds erratically to touch or not at all, but the display itself is clear and shows images correctly. Which component is most likely at fault?

Explanation: The digitizer is the layer responsible for detecting touch input. If the display is working but touch is not, the digitizer is the most likely culprit. Objective 1.2 covers 'Mobile display components' including 'Touch screen/digitizer'. Learn more.

Q19. A user wants to connect their new wireless headset to their smartphone for hands-free calls. Which connection method would they MOST likely use to pair the devices?

Explanation: Bluetooth is the standard wireless technology for connecting short-range peripherals like headsets to smartphones. Objective 1.3 covers 'Connection methods' including 'Bluetooth' for mobile devices. Learn more.

Q20. What is the primary difference between GSM (Global System for Mobile Communications) and CDMA (Code-Division Multiple Access) cellular technologies regarding subscriber identification?

Explanation: GSM networks use Subscriber Identity Module (SIM) cards to identify subscribers and enable network access. CDMA networks traditionally embed subscriber information directly into the phone's hardware, though newer CDMA phones may also use SIM cards for LTE/5G. Objective 1.4 covers 'Global System for Mobile Communications (GSM) vs. code-division multiple access (CDMA)'. Learn more.

Q21. Which physical connector is reversible and common on modern phones, laptops, and docks?

Explanation: USB-C uses a reversible connector and supports data, charging, and optional alternate modes. Learn more.

Q22. Which technology lets compatible devices charge without a cable when placed on a charging pad?

Explanation: Qi is a common wireless charging standard used by phones and accessories. Learn more.

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