ICT Mobile and IoT Devices 5 — Questions and Answers
Question 1: What does the 'Internet of Things' (IoT) primarily refer to?
- High-speed internet connections for mobile devices
- Network of physical devices embedded with sensors that collect and exchange data (Correct answer)
- Cloud storage systems for mobile backups
- Social media platforms connecting global users
Correct answer: Network of physical devices embedded with sensors that collect and exchange data
IoT describes the ecosystem of physical objects embedded with sensors, software, and connectivity that enables them to collect and share data over the internet.
Question 2: Which cellular technology introduced network slicing to support diverse IoT use cases simultaneously on the same infrastructure?
- 3G HSPA+
- 4G LTE
- 5G NR (Correct answer)
- 2G EDGE
Correct answer: 5G NR
5G NR introduced network slicing, allowing operators to create virtual dedicated network segments optimized for different IoT use cases like URLLC or mMTC.
Question 3: A wearable fitness tracker syncs data to a smartphone only when within a few meters. Which technology facilitates this short-range, low-energy connection?
- Wi-Fi 802.11ac
- Bluetooth Low Energy (BLE) (Correct answer)
- NFC
- Zigbee
Correct answer: Bluetooth Low Energy (BLE)
BLE (Bluetooth Low Energy) is designed for short-range communication with minimal power draw, making it ideal for wearables that sync periodically.
Question 4: What is the primary security risk of leaving a mobile device's developer options and USB debugging enabled?
- Reduces battery life permanently
- Allows unauthorized ADB access to extract data or install malware when connected to a computer (Correct answer)
- Disables app store security scanning
- Prevents OS security updates
Correct answer: Allows unauthorized ADB access to extract data or install malware when connected to a computer
USB debugging via ADB (Android Debug Bridge) allows a connected computer to access the device filesystem, install apps, and run commands without screen unlock.
Question 5: Which mobile display technology consumes no power when showing static content because pixels only use energy when changing state?
- AMOLED
- LCD IPS
- E-Ink (E-Paper) (Correct answer)
- Mini-LED
Correct answer: E-Ink (E-Paper)
E-Ink displays use a bistable mechanism where pixels maintain their state without power, only consuming energy when the image changes.
Question 6: A smart factory deploys hundreds of sensors that must operate for 10 years on a single battery and send small telemetry packets. Which standard best fits this requirement?
- Wi-Fi 6E
- NB-IoT (Narrowband IoT) (Correct answer)
- Bluetooth Classic
- HDMI over IP
Correct answer: NB-IoT (Narrowband IoT)
NB-IoT is an LPWAN standard designed for massive IoT deployments requiring deep indoor penetration, long battery life (10+ years), and low-cost connectivity.
Question 7: What is the function of a mobile device's baseband processor?
- Renders graphics for the display
- Handles all cellular and radio communication protocols independently from the main CPU (Correct answer)
- Manages fingerprint authentication
- Controls USB charging negotiation
Correct answer: Handles all cellular and radio communication protocols independently from the main CPU
The baseband processor is a dedicated chip that manages all radio communications (LTE, 5G, GSM) and operates its own real-time OS separate from the application processor.
ICT Mobile and IoT Devices 5
What does the 'Internet of Things' (IoT) primarily refer to?