Q.1 Which of the following is a low-power wide-area network (LPWAN) technology commonly used in IoT?
Wi-Fi
LoRaWAN
Ethernet
Bluetooth
Explanation - LoRaWAN is an LPWAN technology designed for long-range, low-power IoT communications.
Correct answer is: LoRaWAN
Q.2 Which frequency band is commonly used by Zigbee for IoT applications?
2.4 GHz
900 MHz
5 GHz
60 GHz
Explanation - Zigbee operates primarily in the 2.4 GHz ISM band, though regional variations exist.
Correct answer is: 2.4 GHz
Q.3 Which protocol is widely used for lightweight messaging in IoT systems?
HTTP
FTP
MQTT
SMTP
Explanation - MQTT is a publish-subscribe protocol designed for low-bandwidth and resource-constrained IoT devices.
Correct answer is: MQTT
Q.4 NB-IoT is based on which type of network infrastructure?
Satellite
Cellular
Wi-Fi mesh
Bluetooth mesh
Explanation - NB-IoT (Narrowband IoT) is a cellular-based LPWAN technology standardized by 3GPP.
Correct answer is: Cellular
Q.5 Which of the following IoT networking technologies provides the highest data rate?
LoRaWAN
NB-IoT
Wi-Fi
Zigbee
Explanation - Wi-Fi supports higher data rates compared to LPWAN and short-range IoT protocols like Zigbee.
Correct answer is: Wi-Fi
Q.6 Which technology is often used for smart home IoT devices like smart bulbs and locks?
Ethernet
Zigbee
LoRaWAN
Satellite
Explanation - Zigbee is widely used for low-power, short-range smart home IoT applications.
Correct answer is: Zigbee
Q.7 In IoT networking, CoAP stands for?
Control Access Protocol
Constrained Application Protocol
Connected Application Protocol
Centralized Access Protocol
Explanation - CoAP is a lightweight transfer protocol designed for constrained IoT devices.
Correct answer is: Constrained Application Protocol
Q.8 Bluetooth Low Energy (BLE) is mainly optimized for?
High throughput
Low power consumption
Long range
Satellite communication
Explanation - BLE is optimized to provide wireless connectivity with very low energy usage, ideal for IoT.
Correct answer is: Low power consumption
Q.9 Which IoT technology is best suited for long-range communication with low data rates?
LoRaWAN
Bluetooth
Wi-Fi
Zigbee
Explanation - LoRaWAN is designed for long-range and low data-rate IoT communications.
Correct answer is: LoRaWAN
Q.10 Which layer of the IoT architecture does MQTT primarily operate on?
Application layer
Network layer
Physical layer
Data link layer
Explanation - MQTT is an application layer protocol enabling message exchange in IoT systems.
Correct answer is: Application layer
Q.11 Which IoT networking technology supports mesh networking natively?
Zigbee
Wi-Fi
LoRaWAN
NB-IoT
Explanation - Zigbee supports mesh networking, allowing devices to relay data through other nodes.
Correct answer is: Zigbee
Q.12 Which wireless IoT technology is often used in wearables?
BLE
LoRaWAN
Ethernet
NB-IoT
Explanation - Bluetooth Low Energy is commonly used in wearables due to low power consumption and short range.
Correct answer is: BLE
Q.13 Which IoT networking technology leverages existing 4G LTE infrastructure?
LoRaWAN
NB-IoT
Zigbee
Wi-Fi
Explanation - NB-IoT is designed to operate on LTE networks to provide IoT connectivity.
Correct answer is: NB-IoT
Q.14 Which of the following is NOT a short-range IoT communication technology?
Zigbee
Wi-Fi
LoRaWAN
BLE
Explanation - LoRaWAN is a long-range IoT communication technology, unlike the others listed.
Correct answer is: LoRaWAN
Q.15 In IoT, which protocol is used for communication similar to HTTP but optimized for constrained devices?
FTP
CoAP
SMTP
POP3
Explanation - CoAP is optimized for constrained devices and networks in IoT environments.
Correct answer is: CoAP
Q.16 Sigfox technology is primarily designed for?
High-speed streaming
Low-power, wide-area communication
Indoor Wi-Fi replacement
Satellite IoT
Explanation - Sigfox is an LPWAN technology designed for long-range, low-data IoT communication.
Correct answer is: Low-power, wide-area communication
Q.17 Which of these technologies has the shortest typical communication range?
Wi-Fi
BLE
Zigbee
LoRaWAN
Explanation - BLE typically covers a shorter range compared to Zigbee, Wi-Fi, and LoRaWAN.
Correct answer is: BLE
Q.18 Which IoT networking technology was specifically standardized by 3GPP?
LoRaWAN
NB-IoT
Zigbee
Sigfox
Explanation - NB-IoT was standardized by 3GPP as part of the LTE specifications.
Correct answer is: NB-IoT
Q.19 What type of communication model does MQTT follow?
Client-server
Peer-to-peer
Publish-subscribe
Mesh
Explanation - MQTT uses a publish-subscribe communication model for efficient message delivery.
Correct answer is: Publish-subscribe
Q.20 Which IoT networking technology uses chirp spread spectrum modulation?
LoRaWAN
Wi-Fi
Zigbee
NB-IoT
Explanation - LoRaWAN uses chirp spread spectrum modulation for long-range, robust communication.
Correct answer is: LoRaWAN
Q.21 Which wireless communication technology is often used in industrial IoT applications for robustness?
Zigbee
Wi-Fi
Ethernet
LoRaWAN
Explanation - Zigbee’s mesh networking and reliability make it suitable for industrial IoT applications.
Correct answer is: Zigbee
Q.22 Which of the following provides the longest battery life for IoT sensors?
Wi-Fi
Zigbee
LoRaWAN
BLE
Explanation - LoRaWAN’s low power design supports very long battery life in IoT sensors.
Correct answer is: LoRaWAN
Q.23 Which of these IoT networking technologies is license-free globally?
Zigbee
Wi-Fi
LoRaWAN
All of the above
Explanation - Zigbee, Wi-Fi, and LoRaWAN operate on unlicensed ISM bands globally.
Correct answer is: All of the above
Q.24 Which IoT protocol is designed for request/response interactions similar to REST APIs?
MQTT
CoAP
AMQP
DDS
Explanation - CoAP supports RESTful interactions optimized for IoT devices.
Correct answer is: CoAP
Q.25 What is the main limitation of Wi-Fi in IoT applications?
Low data rate
High power consumption
Short range
Lack of standards
Explanation - Wi-Fi offers good data rate but consumes too much power for battery-powered IoT devices.
Correct answer is: High power consumption