What type of mobile display uses pixels that emit their own light without a backlight?

OLED (Organic Light-Emitting Diode)

True or False: LCD displays consume more power than OLED when displaying dark content.

True. LCD backlights stay on constantly, while OLED pixels turn off for black areas.

Apple's proprietary 8-pin reversible connector is called _____.

Lightning connector

Which connector type supports up to 100W power delivery and 40 Gbps data transfer?
A) Lightning
B) USB-C
C) Micro-USB
D) Mini-USB

B) USB-C

What is the maximum range for NFC communication?

4 cm (approximately 1.5 inches)

Riddle: I operate at 13.56 MHz and enable tap-to-pay. What technology am I?

NFC (Near Field Communication)

Which Bluetooth version can reach up to 240 meters in open air?

Bluetooth 5.0/5.1/5.2

True or False: 5G high-band (mmWave) signals can penetrate walls easily.

False. mmWave signals are blocked by walls and glass, requiring line-of-sight.

What frequency band does Bluetooth use for communication?

2.4 GHz ISM band

Li-ion batteries typically last _____ charge cycles before capacity drops to 80%.

300-500

Which charging method is more efficient?
A) Wireless charging
B) Wired charging
C) Both equal
D) Depends on device

B) Wired charging (95% vs 70-80% for wireless)

What wireless charging standard is dominant in mobile devices?

Qi (pronounced 'chee')

True or False: OLED displays have infinite contrast ratio.

True. Black pixels are completely off, creating infinite contrast with lit pixels.

A user's phone won't charge. What should you check FIRST?

Inspect charging port for debris, lint, or bent pins

Which synchronization method works without internet connection?
A) Cloud sync
B) Desktop sync
C) Wi-Fi sync
D) Cellular sync

B) Desktop sync (uses USB cable connection)

What port number is used for secure IMAP email?

993 (IMAP with SSL/TLS)

When pairing Bluetooth devices, what is the typical range requirement?

Within 1 meter during initial pairing process

True or False: Micro-USB connectors are reversible like USB-C.

False. Micro-USB has specific up/down orientation, unlike reversible USB-C.

What causes partial touchscreen failure after dropping a device?

Damaged digitizer requiring professional screen replacement

A phone connects to Wi-Fi but has no internet. What's the FIRST solution?

Forget the Wi-Fi network and reconnect with password

Which 5G band offers the best balance of speed and coverage?

Mid-band 5G (2.5-3.7 GHz)

What technology enables Apple Pay and Google Pay transactions?

NFC (Near Field Communication)

True or False: Active styluses require battery power and device-specific support.

True. They communicate with device and support pressure sensitivity.

What should you avoid when a device is overheating?

Placing it in refrigerator/freezer (causes condensation damage)

Wi-Fi 6 operates on which frequency bands?
A) 2.4 GHz only
B) 5 GHz only
C) 2.4 and 5 GHz
D) 2.4, 5, and 6 GHz

D) 2.4, 5, and 6 GHz (6 GHz for Wi-Fi 6E)

What is the optimal battery charge range for Li-ion longevity?

Between 20-80% charge level

Bluetooth headphones pair successfully but no audio plays. What's the likely cause?

Audio output not set to Bluetooth device in settings

True or False: GSM networks use SIM cards while CDMA networks originally didn't.

True. GSM always used SIMs; CDMA used device-based authentication initially.

What accelerates Li-ion battery degradation the most?

Heat exposure and full charge/discharge cycles

Which display type is better for outdoor use in bright sunlight?

LCD (can achieve higher brightness levels than OLED)

A device shows cellular connection but apps won't load. What should you try?

Enable then disable Airplane Mode to refresh cellular connection

What data transfer speed does Lightning connector support?

USB 2.0 speeds (480 Mbps)

True or False: Wireless charging generates more heat than wired charging.

True. Wireless charging is less efficient, creating more heat during transfer.