Question 1

What type of display technology uses organic compounds that emit light and does NOT require a backlight, resulting in true blacks and thinner screens?

Accepted Answer

OLED (Organic Light-Emitting Diode). Because each pixel generates its own light, no backlight is needed, enabling true blacks when pixels are off.

Question 2

What is the purpose of a digitizer in a mobile touchscreen device?

Accepted Answer

A digitizer is the component that detects and converts touch input (finger or stylus pressure/location) into digital signals the device can process.

Question 3

What is the function of an accelerometer in a mobile device?

Accepted Answer

An accelerometer detects the orientation and movement of the device, enabling features like screen auto-rotation and step counting.

Question 4

Which mobile device component is specifically responsible for enabling contactless payments and short-range data exchange within approximately 4 cm?

Accepted Answer

NFC (Near Field Communication) is the component enabling contactless payments (like Apple Pay or Google Pay) and short-range data exchange at distances of about 4 cm or less.

Question 5

What is the difference between a SIM card and an eSIM?

Accepted Answer

A SIM card is a physical removable card storing carrier and subscriber data, while an eSIM is embedded directly into the device and can be reprogrammed remotely to switch carriers without a physical swap.

CompTIA A+ Mobile Devices

Study Modes

Practice Test

Study Guide

Try These Cards

Related Study Decks

CompTIA A+ Certification — Complete Bundle

CompTIA A+ Hardware & Components

CompTIA A+ Networking Fundamentals

CompTIA A+ Operating Systems

CompTIA A+ Security Threats

CompTIA A+ Security Threats & Tools

Unlock the Full CompTIA A+ Certification Study Bundle