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What does LCD stand for and what are its main advantages?

Liquid Crystal Display. Advantages: lightweight, low power, inexpensive.

What are the disadvantages of LCD displays?

Poor black levels.

What is a TN (Twisted Nematic) LCD?

An original LCD technology with good response time (good for gaming) but poor viewing angles and color shift.

What is an IPS (In-Plane Switching) LCD?

LCD with excellent color representation, wider viewing angles, more expensive.

What is a VA (Vertical Alignment) LCD?

LCD with good color representation, compromise between TN and IPS, but slower response time than TN.

What is OLED and how is it different from LCD?

Organic Light Emitting Diode. Does not use a backlight, thinner, used in tablets/phones, higher cost.

Why do laptops have multiple Wi-Fi antennas?

To support Wi-Fi main and auxiliary connections, and Bluetooth; wires wrap around the screen.

What is the difference between CCFL and LED backlighting?

CCFL: older, thicker, higher voltage. LED: newer, thinner, lower power.

What does an inverter do in an LCD display?

Converts DC to AC for backlight power; replace if screen is too dim or unreadable.

What is a digitizer?

Input device used with pens or fingers on touchscreens; converts touch into digital signals.

What is the purpose of connecting mobile devices?

Synchronization, connectivity, backup, and identification.

What is Micro-USB used for?

Common USB connector for charging and data transfer.

What is Mini-USB?

An older, slightly larger USB connector.

What is USB-C?

A modern connector that supports USB 2.0/3.0/3.1, DisplayPort, Thunderbolt, and HDMI; reversible design.

What is the Lightning connector?

Apple proprietary 8-pin connector; reversible, higher power output, simpler than Micro-USB.

What is a DB-9 interface used for?

Also called DE-9, used for RS-232 serial communication, commonly as a configuration port for network devices.

What is NFC and where is it used?

Near Field Communication. Short-range wireless data transmission used for payments, transport, and secure ID.

What is Bluetooth used for?

High-speed, short-distance wireless communication for phones, headsets, speakers, fitness trackers, etc.

What is a hotspot feature on a mobile device?

Turns the phone into a wireless router, sharing cellular data with other devices.

What is a touch pen or capacitive stylus used for?

To interact with a touchscreen without using your fingers. Helps with handwriting and precise selection.

What is an active stylus?

A digital stylus that communicates directly with the device, supports pressure sensitivity and programmable buttons.

What is a drawing pad used for?

For precise input using an active stylus; often supported across multiple OS platforms.

What is a trackpad?

A mouse replacement common on laptops; allows gestures for right-click, zoom, and window control.

What are the types of headsets and their connections?

Wired (USB or 3.5mm TRRS jack) and wireless (Bluetooth).

What is a port replicator?

A device like a docking station but typically lacks support for expansion cards and connects via USB.

What are GSM and CDMA?

GSM: Global System for Mobile Communications. CDMA: Code Division Multiple Access. Used for cellular network communications.

What’s the difference between GSM and CDMA in terms of hardware?

GSM uses SIM cards and works globally; CDMA phones are tied to providers and don’t use SIMs traditionally.

What is LTE and LTE-A?

LTE supports up to 150 Mbps, LTE-A supports up to 300 Mbps download rates.

What are the benefits of 5G over 4G?

Faster speeds (up to 10 Gbps), lower latency, better support for IoT and cloud processing.

What is PRL and why is it important?

Preferred Roaming List; helps CDMA phones connect to correct towers and can be updated over-the-air.

What is Bluetooth pairing and what are the steps?

Enable Bluetooth, make devices discoverable, select device, confirm PIN, test connectivity.

How does GPS work?

Uses 4+ satellites to triangulate location based on timing differences. Used in maps and location services.

What does MDM stand for and what does it do?

Mobile Device Management. Manages corporate and personal mobile devices, controls apps/data/policies.

What can MDM configure?

Corporate email, two-factor authentication, app restrictions, remote management of device functions.

What data can be synchronized on mobile devices?

Mail, pictures, music, video, calendar, contacts — with control over cellular vs Wi-Fi transfers.