Core 1: Mobile Devices

Which laptop component converts DC power into the high voltage needed to illuminate a CCFL backlight?

• A CMOS battery
• B Inverter ✓
• C Digitizer
• D Backlight diode

Answer: An inverter steps DC up to the high AC voltage a CCFL backlight needs. LED backlights do not require an inverter.

A user wants to replace a cracked laptop screen that responds to touch. Which component captures the touch input?

• A Inverter
• B Digitizer ✓
• C LCD panel
• D Webcam

Answer: The digitizer is the layer that converts physical touch into digital coordinates. The LCD only displays the image.

Which connector standard is reversible and commonly used for charging and data on modern smartphones?

• A Micro-USB
• B USB-C ✓
• C Lightning
• D Mini-USB

Answer: USB-C is reversible and supports power delivery and high-speed data, now standard on most modern devices.

A technician needs to enable a phone to share its cellular connection with a laptop over Wi-Fi. What feature is this?

• A Tethering via USB
• B Mobile hotspot ✓
• C Airplane mode
• D Bluetooth pairing

Answer: A mobile hotspot shares the cellular data connection over Wi-Fi to other devices.

Which protocol synchronizes email, calendar, and contacts and pushes changes to mobile devices in corporate environments?

• A POP3
• B IMAP
• C Exchange ActiveSync ✓
• D SMTP

Answer: Exchange ActiveSync provides push synchronization of mail, calendar, and contacts to mobile devices.

A user reports their laptop does not charge when plugged in but runs on battery. Which is the FIRST component to suspect?

• A Motherboard
• B AC adapter ✓
• C RAM
• D Display

Answer: Start with the simplest, most likely cause: the AC adapter. Test with a known-good adapter before replacing internal parts.