100 IoT (Internet of Things) MCQ With Answers

IoT stands for Internet of Things. It refers to the network of physical objects, devices, vehicles, buildings, and other items that are embedded with sensors, software, and other technologies to connect and exchange data over the internet

Benefits of IoT:

• Efficient resource utilization
• Minimizing Human effort
• Saves time
• Development of AI through IoT
• Improved security

IoT Features:

• Connect various things to the IoT Platform
• Analyze the data collected and use it to build business intelligence
• Integrate various models to improve user experience.

IoT Ecosystem:

Basic architecture:

• Devices/Things: These are the physical objects or devices that are equipped with sensors, actuators, and other hardware to collect data and perform actions.
• Sensors and Actuators: Sensors gather data from the environment. They can measure things like temperature, humidity, light, motion, and more. Actuators, on the other hand, perform actions based on the data received from sensors.
• Connectivity: This layer involves the means by which devices connect to the internet and communicate with each other.
• Gateways: Gateways serve as intermediaries between devices and the central cloud-based servers.
• Cloud Services: Cloud platforms are where the data collected from devices is stored, processed, and analyzed.

Application of IoT:

• Energy conservation
• Smart Transport
• Social life and entertainment
• Supply chain and logistics
• Health and fitness
• Smart environment
• Home automation
• Smart agriculture

IoT Sensor:

It is a device that captures real-world data and translates it into a piece of information that could be interpreted by other instruments. As the name suggests, sensors react to stimuli – be it changes in temperature, sound, or different properties. Hence a sensor in an IoT system senses the desired physical quantity and converts it into electrical signals transmitted to the central cloud-based server directly or via an on-site microcontroller.

Types of Sensors:

• Temperature sensor
• Humidity sensor
• Proximity sensor
• Level sensor
• Gyroscope.

Features of Sensors:

• Range
• Accuracy
• Sensitivity
• Resolution

IoT (Internet of Things) MCQ

1. What does IoT stand for?

a. Internet of Technology
b. Internal Object Transfer
c. Internet of Things
d. Intuitive Online Training

Answer: c. Internet of Things

2. Which of the following is not a key component of an IoT system?

a. Sensors
b. Internet connectivity
c. A mouse and keyboard
d. Data processing

Answer: c. A mouse and keyboard

3.Which communication protocol is most commonly used for low power and short-distance communication in IoT?

a. Wi-Fi
b. Bluetooth Low Energy (BLE)
c. Ethernet
d. LTE

Answer: b. Bluetooth Low Energy (BLE)

4. Which of the following is NOT a challenge of IoT?

a. Privacy concerns
b. Scalability
c. Reduced data generation
d. Security issues

Answer: c. Reduced data generation

5. Which platform allows IoT devices to connect to cloud services like AWS IoT?

a. MQTT
b. HTTP
c. FTP
d. ICMP

Answer: a. MQTT

6. Which among the following is a major application of IoT in agriculture?

a. Precision farming
b. Online shopping
c. Video conferencing
d. Text messaging

Answer: a. Precision farming

7. Which layer in the IoT stack is responsible for data accumulation?

a. Perception layer
b. Network layer
c. Application layer
d. Database layer

Answer: a. Perception layer

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8. Which technology allows devices to communicate over long distances without consuming much power in the IoT domain?

a. Wi-Fi
b. NFC
c. Zigbee
d. LoRaWAN

Answer: d. LoRaWAN

9. Which IoT device is popularly known to assist users in voice-controlled activities?

a. Google Home
b. PlayStation 5
c. Windows PC
d. USB Drive

Answer: a. Google Home

10. For which purpose is the protocol CoAP commonly used in IoT?

a. High speed file transfer
b. Voice over IP
c. Constrained environments
d. Online gaming

Answer: c. Constrained environments

11. Which of the following is not a type of IoT sensor?

a. Temperature sensor
b. Humidity sensor
c. Brightness sensor
d. Music sensor

Answer: d. Music sensor

12. What is the primary purpose of the IPv6 protocol in IoT?

a. Improved security
b. Enhanced speed
c. Better graphics
d. More available addresses

Answer: d. More available addresses

13. Which company introduced the concept of the “Smart Home“?

a. Apple
b. Microsoft
c. Google
d. Samsung

Answer: a. Apple

14. Which OS is specifically designed for IoT devices?

a. Android
b. Windows
c. iOS
d. RIOT

Answer: d. RIOT

15. Which one of the following is a primary concern when implementing IoT solutions in healthcare?

a. Entertainment
b. Patient data privacy
c. Graphics rendering
d. Music streaming

Answer: b. Patient data privacy

16. In which industry can IoT solutions improve the supply chain?

a. Manufacturing
b. Gaming
c. Social media
d. Video editing

Answer: a. Manufacturing

17. Which one is a famous IoT-based wearable device?

a. Microwave oven
b. Apple Watch
c. Desktop computer
d. Refrigerator

Answer: b. Apple Watch

18. What kind of network is typically created by IoT devices in homes?

a. Satellite network
b. PAN (Personal Area Network)
c. VPN (Virtual Private Network)
d. MAN (Metropolitan Area Network)

Answer: b. PAN (Personal Area Network)

19. Which of the following is a popular database used to store IoT data due to its capability to store time-series data?

a. MySQL
b. MongoDB
c. InfluxDB
d. SQL Server

Answer: c. InfluxDB

20. What is the primary function of the “Edge” in Edge Computing in the context of IoT?

a. Internet connectivity
b. Data storage
c. Data processing near the source of data
d. Power supply

Answer: c. Data processing near the source of data

21. Which standard focuses on the interoperability of IoT devices?

a. IEEE 802.11
b. IEEE 802.15.4
c. GSM
d. HTTPS

Answer: b. IEEE 802.15.4

22. Which of the following IoT application focuses on city-wide solutions?

a. Wearables
b. Home Automation
c. Smart City
d. Industrial Automation

Answer: c. Smart City

23. Which protocol is a lightweight publish/subscribe messaging protocol designed for IoT?

a. HTTP
b. CoAP
c. MQTT
d. FTP

Answer: c. MQTT

24. For close range communication, which technology is generally preferred in IoT devices?

a. NFC
b. Wi-Fi
c. GSM
d. Satellite

Answer: a. NFC

25. Which of the following is NOT a typical security concern in IoT?

a. Physical access to devices
b. Cloud storage integrity
c. Device firmware updates
d. High graphic resolutions

Answer: d. High graphic resolutions

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26. Which cloud platform offers IoT-specific services like Azure IoT Suite?

a. Google Cloud
b. IBM Cloud
c. Microsoft Azure
d. Oracle Cloud

Answer: c. Microsoft Azure

27. What is the main advantage of edge computing in IoT?

a. Increased cloud storage
b. Improved graphic resolution
c. Reduction in latency
d. Increased power consumption

Answer: c. Reduction in latency

28. Which IoT layer is primarily responsible for collecting data from the environment?

a. Processing layer
b. Sensing layer
c. Network layer
d. Application layer

Answer: b. Sensing layer

29. What is a common application of IoT in transportation?

a. Video Streaming
b. Social Media Integration
c. Fleet Management
d. Online Gaming

Answer: c. Fleet Management

30. Which of the following security mechanisms can be used to ensure the confidentiality of IoT data during transmission?

a. Two-factor authentication
b. Hashing algorithms
c. Encryption
d. CAPTCHA

Answer: c. Encryption

31. What is the role of a gateway device in an IoT architecture?

a. Processing and analysis of data
b. Data sensing
c. Sending data directly to the cloud
d. Acting as a bridge between IoT devices and the cloud

Answer: d. Acting as a bridge between IoT devices and the cloud

32. Which wireless technology is commonly used for short-range communication between IoT devices and smartphones?

a. LTE
b. Zigbee
c. Bluetooth
d. LoRaWAN

Answer: c. Bluetooth

33. What is the purpose of a Digital Twin in IoT?

a. To create virtual reality simulations
b. To build a duplicate physical device
c. To monitor and model a physical device digitally
d. To generate random numbers

Answer: c. To monitor and model a physical device digitally

34. Which IoT communication model allows direct communication between devices without using a central server?

a. Peer-to-Peer
b. Client-Server
c. Publisher-Subscriber
d. Master-Slave

Answer: a. Peer-to-Peer

35. Which of the following is an example of an IoT application in the healthcare industry?

a. Online gaming platform
b. Smartwatch for tracking fitness
c. Music streaming service
d. Social media platform

Answer: b. Smartwatch for tracking fitness

36. What is the primary purpose of mesh networking in IoT?

a. Providing internet access to all devices
b. Extending the range of IoT devices
c. Enabling offline communication between devices
d. Reducing data latency

Answer: b. Extending the range of IoT devices

37. Which IoT protocol is known for its lightweight nature and is commonly used for low-power devices?

a. HTTP
b. MQTT
c. CoAP
d. FTP

Answer: c. CoAP

38. Which of the following statements about fog computing in IoT is true?

a. It exclusively relies on cloud servers for processing.
b. It centralizes all data processing on IoT devices.
c. It distributes data processing closer to the data source.
d. It doesn’t involve any networking components.

Answer: c. It distributes data processing closer to the data source.

Also Read:- How Do IOT Devices Update Remotely

39. What is the main purpose of using actuators in IoT devices?

a. To sense environmental data
b. To process data
c. To control physical processes
d. To analyze network traffic

Answer: c. To control physical processes

40. Which technology is commonly used in smart homes to control lighting, temperature, and other appliances remotely?

a. NFC
b. Zigbee
c. Wi-Fi
d. Bluetooth

Answer: c. Wi-Fi

41. Which IoT application involves tracking the location and movement of assets, vehicles, or people?

a. Precision agriculture
b. Home automation
c. Fleet management
d. Video streaming

Answer: c. Fleet management

42. What is the primary advantage of using fog computing over traditional cloud computing in IoT?

a. Lower latency
b. Unlimited storage
c. Higher processing power
d. Better graphics rendering

Answer: a. Lower latency

43. Which IoT technology uses radio frequency identification to identify and track objects?

a. GPS
b. Zigbee
c. NFC
d. Ethernet

Answer: c. NFC

44. Which of the following is a potential concern related to the security of IoT devices?

a. Excessive battery life
b. Lack of interoperability
c. Too much data storage
d. Too many graphics

Answer: b. Lack of interoperability

45. What is the term used to describe the process of making everyday objects “smart” and capable of connecting to the internet?

a. Virtualization
b. Augmentation
c. Digitization
d. Ubiquitous computing

Answer: d. Ubiquitous computing

46. In which IoT application would you find wearable devices like smartwatches and fitness trackers?

a. Agriculture
b. Logistics
c. Healthcare
d. Automotive

Answer: c. Healthcare

47. What is a primary advantage of using edge computing in IoT over traditional cloud computing?

a. Lower power consumption
b. Higher storage capacity
c. Unlimited processing speed
d. Remote access

Answer: a. Lower power consumption

48. Which wireless communication technology is used for long-range, low-power IoT applications?

a. Wi-Fi
b. Zigbee
c. Bluetooth
d. LoRaWAN

Answer: d. LoRaWAN

49. Which IoT component is responsible for making sense of the data collected by sensors?

a. Actuators
b. Microcontrollers
c. Cloud servers
d. Data analytics algorithms

Answer: d. Data analytics algorithms

50. What is the purpose of MQTT’s “Quality of Service” (QoS) levels in IoT communication?

a. To improve graphics quality
b. To enhance battery life
c. To ensure reliable message delivery
d. To increase network bandwidth

Answer: c. To ensure reliable message delivery

51. Which IoT communication model involves devices subscribing to specific topics and receiving messages published to those topics?

a. Peer-to-peer
b. Client-server
c. Publisher-subscriber
d. Master-slave

Answer: c. Publisher-subscriber

52. Which technology allows devices to communicate with each other over short distances without the need for an internet connection?

a. Cellular network
b. Wi-Fi
c. NFC
d. Satellite communication

Answer: c. NFC

53. In an IoT ecosystem, what does the term “Thing” refer to?

a. Cloud server
b. Mobile application
c. Sensor or device
d. Data analytics algorithm

Answer: c. Sensor or device

54. Which type of attack involves overwhelming an IoT device or network with excessive traffic to disrupt its normal functioning?

a. Malware attack
b. DDoS attack
c. Social engineering attack
d. Insider attack

Answer: b. DDoS attack

55. Which IoT technology is used to identify the location of an object or person using signals from satellites?

a. Zigbee
b. NFC
c. RFID
d. GPS

Answer: d. GPS

56. Which layer of the IoT architecture is responsible for analyzing and processing data collected from sensors?

a. Perception layer
b. Network layer
c. Application layer
d. Data analytics layer

Answer: c. Application layer

57. What is the term for the practice of connecting physical devices to the internet to gather and exchange data?

a. Cloud computing
b. Web browsing
c. Internet of Things (IoT)
d. Virtual reality

Answer: c. Internet of Things (IoT)

58. What is the purpose of IoT protocols like CoAP (Constrained Application Protocol)?

a. High-speed data transfer
b. Resource-constrained device communication
c. Audio streaming
d. Virtualization of devices

Answer: b. Resource-constrained device communication

59. Which IoT communication model involves a central device controlling and communicating with multiple peripheral devices?

a. Peer-to-peer
b. Client-server
c. Publisher-subscriber
d. Master-slave

Answer: d. Master-slave

60. What is the primary goal of IoT analytics?

a. Enhancing battery life
b. Improving graphical user interfaces
c. Extracting insights from IoT data
d. Increasing physical device durability

Answer: c. Extracting insights from IoT data

61. Which type of IoT communication network involves devices connecting to the internet through a central point like a home router?

a. Star topology
b. Mesh topology
c. Bus topology
d. Ring topology

Answer: a. Star topology

62. What is the purpose of a digital certificate in IoT security?

a. Storing sensor data
b. Authenticating devices and servers
c. Enhancing battery life
d. Rendering high-resolution graphics

Answer: b. Authenticating devices and servers

63. Which IoT application focuses on optimizing the use of resources in urban environments, such as energy and transportation?

a. Precision farming
b. Smart cities
c. Industrial automation
d. Home automation

Answer: b. Smart cities

64. Which IoT concept involves machines or devices that can communicate, cooperate, and make decisions without human intervention?

a. Artificial intelligence
b. Machine learning
c. Autonomous computing
d. Machine-to-machine (M2M) communication

Answer: d. Machine-to-machine (M2M) communication

65. Which of the following is an example of a sensor used in IoT applications?

a. Loudspeaker
b. Printer
c. Microphone
d. Keyboard

Answer: c. Microphone

66. In the context of IoT, what is the primary purpose of data visualization?

a. Reducing data transmission
b. Enhancing security protocols
c. Converting data to sound
d. Making data insights accessible and understandable

Answer: d. Making data insights accessible and understandable

67. Which IoT application involves using technology to monitor and manage the condition of machines and equipment in an industrial setting?

a. Precision farming
b. Healthcare monitoring
c. Industrial automation
d. Home security

Answer: c. Industrial automation

68. Which of the following is a concern related to the scalability of IoT systems?

a. Low battery life
b. High graphical requirements
c. Limited storage capacity
d. Handling a large number of devices and data

Answer: d. Handling a large number of devices and data

69. Which technology is used to establish a secure, encrypted communication between a user’s browser and a website?

a. HTTP
b. FTP
c. SSL/TLS
d. UDP

Answer: c. SSL/TLS

70. What is the main function of a humidity sensor in IoT applications?

a. Tracking location
b. Measuring temperature
c. Detecting humidity levels
d. Enhancing battery life

Answer: c. Detecting humidity levels

71. What is the main purpose of a gateway in an IoT network?

a. Data analytics
b. Data sensing
c. Data storage
d. Data communication

Answer: d. Data communication

72. Which IoT communication protocol is known for its low power consumption and suitability for short-range communication?

a. Bluetooth
b. Wi-Fi
c. LoRaWAN
d. Zigbee

Answer: a. Bluetooth

73. Which layer of the OSI model is responsible for routing and forwarding data packets between devices in an IoT network?

a. Application layer
b. Network layer
c. Data link layer
d. Physical layer

Answer: b. Network layer

74. Which IoT application involves using sensors to monitor air quality and pollution levels in urban areas?

a. Precision agriculture
b. Smart cities
c. Healthcare monitoring
d. Industrial automation

Answer: b. Smart cities

75. What is the primary purpose of a digital twin in the context of IoT?

a. Simulating virtual reality environments
b. Enhancing data storage capacity
c. Monitoring physical devices in real-time
d. Improving data encryption algorithms

Answer: c. Monitoring physical devices in real-time

76. Which wireless technology is commonly used for low-power, short-range communication between IoT devices, such as wireless sensor networks?

a. Wi-Fi
b. Bluetooth
c. LTE
d. LoRaWAN

Answer: b. Bluetooth

77. In the context of IoT security, what does the term “DDoS” stand for?

a. Data Defense over Systems
b. Distributed Denial of Service
c. Device Detection of Security
d. Digital Data on Servers

Answer: b. Distributed Denial of Service

78. Which IoT application involves using sensors to monitor the condition of equipment and predict maintenance needs in industries?

a. Precision agriculture
b. Healthcare monitoring
c. Industrial automation
d. Smart home

Answer: c. Industrial automation

79. What is the purpose of a firmware update in IoT devices?

a. Enhancing battery life
b. Upgrading hardware components
c. Improving data visualization
d. Fixing software vulnerabilities

Answer: d. Fixing software vulnerabilities

80. Which IoT component is responsible for taking action based on data received from sensors?

a. Actuator
b. Gateway
c. Microcontroller
d. Sensor node

Answer: a. Actuator

81. Which IoT communication model involves devices directly communicating with each other without a central server?

a. Peer-to-peer
b. Client-server
c. Publisher-subscriber
d. Master-slave

Answer: a. Peer-to-peer

82. What is the term for a network topology in which each device is connected to every other device, forming a mesh-like structure?

a. Star topology
b. Bus topology
c. Mesh topology
d. Ring topology

Answer: c. Mesh topology

83. Which IoT application involves using sensors to monitor the behavior of people or animals in natural habitats?

a. Precision agriculture
b. Wildlife conservation
c. Industrial automation
d. Home security

Answer: b. Wildlife conservation

84. What is the role of fog computing in IoT?

a. Storing large volumes of data in the cloud
b. Centralized data processing on IoT devices
c. Distributing data processing closer to the data source
d. Enabling real-time data streaming

Answer: c. Distributing data processing closer to the data source

85. Which IoT communication protocol is designed for low-power, constrained devices and is often used for home automation?

a. MQTT
b. HTTP
c. CoAP
d. FTP

Answer: c. CoAP

86. Which technology is commonly used in smart homes to control devices using spoken language commands?

a. GPS
b. NFC
c. RFID
d. Voice assistants

Answer: d. Voice assistants

87. Which IoT layer is responsible for processing data and making decisions based on the collected data?

a. Sensing layer
b. Network layer
c. Application layer
d. Data storage layer

Answer: c. Application layer

88. Which IoT application involves using sensors to monitor soil conditions, weather patterns, and crop health to optimize agricultural practices?

a. Precision agriculture
b. Smart cities
c. Healthcare monitoring
d. Industrial automation

Answer: a. Precision agriculture

89. What is the term for the practice of designing IoT devices with security in mind from the beginning of the development process?

a. Security retrofitting
b. Secure architecture
c. Security by design
d. Secure patching

Answer: c. Security by design

90. Which IoT communication model involves devices sending data to a central server for processing and analysis?

a. Peer-to-peer
b. Client-server
c. Publisher-subscriber
d. Master-slave

Answer: b. Client-server

91. Which IoT application involves using sensors to monitor the health and well-being of patients remotely?

a. Precision agriculture
b. Smart cities
c. Healthcare monitoring
d. Industrial automation

Answer: c. Healthcare monitoring

92. What is the primary goal of edge computing in IoT?

a. Reducing data storage costs
b. Minimizing data collection frequency
c. Improving data processing speed
d. Enhancing cloud-based analytics

Answer: c. Improving data processing speed

93. Which protocol is commonly used for secure communication over the Internet in IoT applications?

a. HTTP
b. FTP
c. SSL/TLS
d. DNS

Answer: c. SSL/TLS

94. What is the purpose of a sensor node in an IoT network?

a. Data processing
b. Data storage
c. Data communication
d. Data visualization

Answer: c. Data communication

95. Which IoT component is responsible for converting analog signals from sensors into digital data for processing?

a. Actuator
b. Microcontroller
c. Gateway
d. Cloud server

Answer: b. Microcontroller

96. Which IoT application involves using sensors and actuators to control and automate home devices such as lighting, heating, and security systems?

a. Precision agriculture
b. Smart cities
c. Healthcare monitoring
d. Home automation

Answer: d. Home automation

97. What is the term for the practice of using multiple IoT devices to work together and achieve a common goal?

a. Device collaboration
b. Device interaction
c. Device synchronization
d. Device orchestration

Answer: d. Device orchestration

98. Which IoT communication model involves devices subscribing to specific data sources and receiving updates whenever new data is available?

a. Peer-to-peer
b. Client-server
c. Publisher-subscriber
d. Master-slave

Answer: c. Publisher-subscriber

99. What is the primary concern of IoT security known as “device spoofing”?

a. Unauthorized data access
b. Physical theft of devices
c. Impersonation of devices
d. Device malfunction

Answer: c. Impersonation of devices

100. Which wireless technology is commonly used for long-range, low-power communication in IoT applications, especially in rural areas?

a. Bluetooth
b. NFC
c. LoRaWAN
d. Zigbee

Answer: c. LoRaWAN

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