ICT Mobile and IoT Devices 2 — Questions and Answers
Question 1: Which wireless protocol is most commonly used for short-range IoT device communication with very low power consumption?
- Wi-Fi 6
- Zigbee (Correct answer)
- LTE-M
- Ethernet
Correct answer: Zigbee
Zigbee operates in the 2.4 GHz band and is designed for low-power, low-data-rate IoT mesh networks.
Question 2: A mobile device is running low on battery. Which power-saving feature allows the device to receive push notifications while using minimal energy?
- Airplane mode
- Doze mode (Correct answer)
- Safe mode
- Developer mode
Correct answer: Doze mode
Doze mode (Android) reduces background CPU and network activity while still allowing high-priority push notifications.
Question 3: What does the acronym IMEI stand for in mobile devices?
- International Mobile Equipment Identity (Correct answer)
- Integrated Mobile Encryption Interface
- Internal Memory Expansion Index
- Internet Mobile Exchange Identifier
Correct answer: International Mobile Equipment Identity
IMEI (International Mobile Equipment Identity) is a unique 15-digit number that identifies a mobile device globally.
Question 4: Which IoT communication protocol is specifically designed for sending small messages over unreliable networks with minimal bandwidth?
- HTTP/2
- MQTT (Correct answer)
- FTP
- SMTP
Correct answer: MQTT
MQTT (Message Queuing Telemetry Transport) is a lightweight publish-subscribe protocol ideal for IoT devices on constrained networks.
Question 5: A user wants to track their fitness data across multiple apps without re-entering it. Which Android feature enables this sharing between health apps?
- Google Fit API
- Health Connect (Correct answer)
- Wear OS Bridge
- Sync Adapter
Correct answer: Health Connect
Health Connect (formerly Google Health Connect) is a centralized health data repository allowing apps to share and access fitness data securely.
Question 6: What is the maximum theoretical data transfer speed of USB 3.2 Gen 2x2?
- 5 Gbps
- 10 Gbps
- 20 Gbps (Correct answer)
- 40 Gbps
Correct answer: 20 Gbps
USB 3.2 Gen 2x2 uses two lanes simultaneously, each at 10 Gbps, achieving a maximum of 20 Gbps.
Question 7: Which technology allows a smartphone to emulate a credit card for contactless payments at NFC-enabled terminals?
- MST (Magnetic Secure Transmission)
- HCE (Host Card Emulation) (Correct answer)
- BLE (Bluetooth Low Energy)
- QR Code Payment
Correct answer: HCE (Host Card Emulation)
HCE (Host Card Emulation) allows Android devices to emulate NFC smart cards for payments without requiring a hardware secure element.
ICT Mobile and IoT Devices 2
Which wireless protocol is most commonly used for short-range IoT device communication with very low power consumption?