NPTEL Introduction To Internet Of Things Assignment Answers

  1. State whether the following statement is true or false.
    Statement: Wired HART lacks a network layer.

a. True
b. False

Answer :- a
  1. The HART physical layer is derived from _ protocol and operates only in _ GHz ISM band.

a. IEEE 802.15.4, 2.4
b. IEEE 802.15.4, 4.8
c. IEEE 802.16.5, 4.8
d. None of these

Answer :- a
  1. State whether the following statement is True or False
    Statement: Super-frames in HART consist of grouped 20ms wide timeslots.

a. True
b. False

Answer :- b
  1. _ identifies channels consistently affected by interference and removes them from use.

a. Channel hopping
b. Channel aggregating
c. Channel blacklisting
d. Frequency aggregating

Answer :- c
  1. The _ supervises each node in the network and guides them on when and where to send packets.

a. Application manager
b. Network manager
c. Trust manager
d. None of these

Answer :- b
  1. NFC is designed for use by devices within _ to each other?

a. Close proximity
b. No near contact
c. Both (a) and (b)
d. None of these

Answer :- a
  1. _ contain information which is readable by other devices, however it cannot read information itself.

a. Active NFC devices
b. Dumb NFC devices
c. Passive NFC devices
d. None of these

Answer :- c
  1. NFC devices work on the principle of _?

a. Magnetic introduction
b. Magnetic induction
c. Both (a) and (b)
d. None of these

Answer :- b
  1. Which of these is NOT a mode of operation NFC?

a. Server-to-Server
b. Peer-to-Peer
c. Read/Write
d. Card emulation

Answer :- a
  1. State whether the following statement is true or false
    Statement: Paging in Bluetooth is the process of forming a connection between two Bluetooth devices.

a. True
b. False

Answer :- a
  1. There are __ modes of operation in Bluetooth.

a. 3
b. 4
c. 5
d. None of these

Answer :- b
  1. Zwave uses __ for signaling and control?

a. Light
b. RF
c. Sound
d. None of these

Answer :- b
  1. Which of the following is/are not a constraint on sensor nodes?

a. Must consume high power
b. Not be adaptive to the environment
c. Both (a) and (b)
d. None of these

Answer :- c
  1. __ are simply those that are unable to perform an operation; this could be because of power failure and environmental events.

a. Normal nodes
b. Failed nodes
c. Badly failed nodes
d. None of these

Answer :- b
  1. Dumb behavior of sensor nodes is _ in nature (as it is dependent on the effects of the environmental conditions).

a. Temporal
b. Spatial
c. Both (a) and (b)
d. None of these

Answer :- a
  1. The full form of MQTT is

a. Message Queue Telemetry Transport
b. Message Query Telemetry Transport
c. Message Queue Telemedicine Transport
d. None of these

Answer :- a
  1. In MQTT, a ____ controls the publish-subscribe messaging pattern.

a. Publishers
b. Message Broker
c. Subscribers
d. All of these

Answer :- b
  1. Which of the following is NOT a component of MQTT?

a. Publishers
b. Users
c. Brokers
d. None of these

Answer :- b
  1. __ is an extension of MQTT which uses lightweight attribute based encryption. It has _ main stages.

a. SMQTT, three
b. BMQTT, three
c. SMQTT, four
d. None of these

Answer :- c
  1. Which of the following is based on Request-Response model between end-points?

a. MQTT
b. CoAP
c. Both (a) and (b)
d. Neither (a) nor (b)

Answer :- b
  1. The two sub-layers of CoAP are –

a. Messaging and Holding
b. Messaging and Backoff
c. Messaging and Teardown
d. Messaging and Request/response

Answer :- d
  1. Which of the following is used for real-time exchange of structured data?

a. MQTT
b. SMQTT
c. XMPP
d. CoAP

Answer :- c
  1. XMPP uses the ____ architecture.

a. Publish-subscribe
b. Client-serverc. Both (a) and (b)
d. Neither (a) nor (b)

Answer :- b
  1. With respect to AMQP, which of the following message delivery guarantees allow for each message to be delivered certainly as well as to be delivered multiple times.

a. At-least-once
b. At-most-once
c. Exactly-once
d. Both (a) and (b)

Answer :- a
  1. Which of the following is/are NOT an AMQP frame type?

a. Open
b. Close
c. End
d. None of these

Answer :- d
  1. Which of the following is/are NOT the function/functions of the Bindings component of the AMQP protocol?

a. Receives messages and routes them to queues
b. Separate queues for separate business process
c. Consumer receive messages from queues
d. All of these

Answer :- d
  1. Which of the following is/are NOT exchange types in AMQP?

a. Direct
b. Indirect
c. Fan-out
d. Topic

Answer :- b
  1. State whether the following statement is True or False. Statement: The IEEE 802.15.4 is a well-known standard for low data-rate Wireless Personal Area Network (WPAN).

a. True
b. False

Answer :- a
  1. The networking topologies supported in the IEEE 802.15.4 are –

a. Only Star
b. Star and Mesh
c. Only Mesh
d. None of these

Answer :- b
  1. State whether the following statement is True or False. Statement: Periodic transmission of beacon messages does not occur in beacon enabled networks (IEEE 802.15.4).

a. False
b. True

Answer :- a
  1. Which of the following are the enablers of IoT?

a. RFID
b. Nanotechnology
c. Sensors
d. All of the these

Answer :- D

All of the mentioned options are enablers of the Internet of Things (IoT):

a. RFID (Radio Frequency Identification) allows objects or items to be uniquely identified using radio waves, enabling them to be tracked and managed within IoT systems.

b. Nanotechnology plays a role in IoT by providing miniaturized components and devices, making it possible to create tiny sensors, processors, and actuators that can be integrated into various objects, enabling them to connect to IoT networks.

c. Sensors are a crucial component of IoT, as they gather data from the physical environment and convert it into electronic signals, which can then be processed and utilized in various applications.

  1. Which of the following is/are NOT a characteristic of IoT?

a. Efficient, scalable and associated architecture.
b. Ambiguous naming and addressing.
c. Abundance of sleeping nodes, mobile and non-IP devices.
d. None of these

Answer :- b
  1. State whether the following statement is True or False. Statement: The increasing number of devices in IoT is expected to result in an address crunch.

a. True
b. False

Answer :- a 
The statement is true. The increasing number of devices in the Internet of Things (IoT) is expected to result in an address crunch. As more and more devices get connected to the internet and the IoT ecosystem grows, there is a concern that the current Internet Protocol version 4 (IPv4) address space may become insufficient to accommodate all these devices. IPv4 has a limited number of unique IP addresses, and with the rapid proliferation of IoT devices, there is a risk of running out of available addresses.
  1. State whether the following statement is True or False. Statement: The gateway has a unique network prefix, which can be used to identify them globally.

a. True
b. False

Answer :- a
  1. Sometimes, when there is a need for the nodes to communicate directly to the Internet, __ can be used.

a. Sensors
b. Actuators
c. Tunneling
d. None of these

Answer :- c
  1. In ___ a node/network is connected to multiple networks for improved reliability.

a. Transparent roaming
b. Multi-homing
c. None of these
d. Both (a) and (b)

Answer:- b
  1. The IPv6 notation uses _______ values.

a. Roman
b. Hexadecimal
c. Both (a) and (b)
d. None of these

Answer :- b
  1. A _ detects (senses) changes in the ambient conditions or in the state of another device or a system, and forwards or processes this information in a certain manner.

a. Sensor
b. Actuator
c. Both (a) and (b)
d. None of these

Answer :- a
  1. A microphone is an example of an _.

a. Input device and actuator
b. Only actuator
c. Only Transducer
d. Input device and transducer

Answer :- d
  1. The ____ of a sensor is the smallest change it can detect in the quantity that it is measuring.

a. Resolution
b. Bias
c. Noise
d. None of these

Answer :- a

The resolution of a sensor refers to the smallest change in the quantity it is measuring that the sensor can detect and accurately represent. It represents the level of detail or precision with which the sensor can measure changes in the input parameter. Higher resolution sensors can detect smaller changes in the measured quantity, while lower resolution sensors have limitations in detecting fine variations.

For example, in a temperature sensor with a resolution of 0.1°C, it can detect temperature changes as small as 0.1°C and accurately represent them in its output. Resolution is an important specification for sensors, especially when precise measurements are required in various applications, including IoT, automation, and scientific measurements.

  1. Based on the data type, sensors are classified as ___________.

a. Scalar and Vector/Multimedia
b. Only scalar
c. Both (a) and (b)
d. Only vector

Answer :- a
  1. Solenoid valve is an example of __________.

a. Sensor
b. Actuator
c. Processing unit
d. None of these

Answer :- b
  1. An actuator requires a __________ and __________.

a. Control signal and a bias signal
b. Control signal and a source of energy
c. Noise signal and a source of energy
d. None of these

Answer :- b
  1. State whether the following statement is True or False. Statement: Pneumatic rack and pinion actuators are used for valve controls of water pipes.

a. True
b. False

Answer :- a
  1. Which of the following is NOT a function of an IoT gateway?

a. Switching
b. Routing
c. Protocol conversion
d. Generating noise

Answer :- d

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