IoT Architecture & Protocols
JKSSB Sub-Inspector (Telecommunication) · IoT, Embedded Systems & Mechatronics · 20 practice questions with answers and explanations: 7 Easy, 13 Medium, 0 Hard.
Sample questions
Sample Easy question 1
Which lightweight publish-subscribe protocol is widely used in IoT?
- MQTT
- POP3
- SMTP
- FTP
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Answer: A. MQTT suits small devices and unreliable, low-bandwidth networks.
Sample Easy question 2
Which wireless technology is designed for long-range, low-power IoT links?
- LoRa (LoRaWAN)
- Wi-Fi 6 alone
- Wired Ethernet
- Optical fibre
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Answer: A. LoRaWAN covers kilometres with very low power use.
Sample Easy question 3
What does RFID use to identify tagged objects?
- Visible light alone
- Magnetic tape
- Sound waves
- Radio waves
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Answer: D. An RFID reader powers or reads tags using radio signals.
Sample Medium question 4
What does edge computing do?
- Stores data alone on tape
- Replaces all sensors
- Processes data close to where it is generated instead of sending everything to the cloud
- Blocks internet access
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Answer: C. Edge processing cuts latency and bandwidth use.
Sample Medium question 5
What is the role of an IoT gateway?
- Drawing graphs of data
- Generating electricity for devices
- Removing sensors from the network
- Connecting local devices to the internet or cloud and often translating protocols
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Answer: D. A gateway bridges constrained device networks and IP networks.
Sample Medium question 6
What is the first layer, which senses and collects data, in a simple three-layer IoT architecture?
- Application layer
- Perception layer
- Business layer
- Network layer
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Answer: B. The perception layer holds sensors and actuators; the network layer moves data; the application layer serves users.