Things and Connections important MCQs in English/Hindi | Nielit Notes | PDF

This post covers all important Questions from the topic "Things and Connections".

These MCQs will definitely help to pass IT and Computer students in any exam and interview that have Things and Connections topic.

Things and Connections chapter cover the following topics:

1. Working of Controlled Systems, Real-time systems with feedback loop e.g. thermostat in refrigerator, AC, etc.

2. Connectivity models – TCPIP versus OSI model, different type of modes using wired and wireless methodology.

3. The process flow of an IoT application.

After completion of Things and Connections unit, Students will be able to understand: 

  • Closed loop/ feedback loop system.
  • The use of sensors, actuators and controllers in the IoT process flow.
  • TCP/IP Versus OSI models.
  • Wired and wireless connectivities.

Things and Connections MCQs

Here are the 35 most important and frequently asked MCQs from the  "Things and Connections" topic.

1. A control system is generally met with the time response specifications:

a. Damping factor

b. Setting time

c. Steady state accuracy

d. All of the mentioned

Ans. d

2. Controllers play which of the following role in the control system?

a. They act on the error signal coming out of the summing junction and output a suitable to the actuator

b. They try to reduce steady state error optimizes overshoot

c. They amplify the signals going to the actuator

d. All of the mentioned

Ans. c

3. In closed loop control system, what is the sensitivity of the gain of the overall system, M to the variation in G?

a. G/1GH

b. 1/1+GH

c. G/1+G

d. 1/1+G

Ans. b

21. Feedback control system is basically ______________

a. Band pass filter

b. Band stop filter

c. High pass filter

d. Low pass filter

Ans. d

5. Loop gain is equal to:

a.Product of all branch gains in a loop

b.Product of all branch gains while traversing the forward path

c.Summation of all branch gains in a loop

d.Sum of all branch gains while traversing the forward path


6. Which of the following is not a feature of a good control system?

a. Slow response

b. Sufficient power handling capacity

c. Good stability

d. Good accuracy

Ans. a

7. MQTT works on the top of ________ which maintains the reliability of message & no data loss.

a. UDP

b. TCP


d. BGP

Ans. b

8. COAP is web transfer protocol and follows _______ model.

a. Request Response

b. Query response

c. Request subscribes

d. Publish subscribe

Ans. a

9. The open loop transfer function of the feedback control system is given by G(s) = K(s+3)/s(s+4)2(s+5)(s+6). The number of asymptotes and the centroid of asymptotes of the root loci of closed loop system is?

a. -4 and (-4,0)

b. 4 and (-4,0)

c. -3 and (-12,0)

d. 3 and (-12,0)

Ans. b

10. With negative feedback in a closed loop control system, the system sensitivity to parameter variation:

a. Becomes infinite

b. Becomes zero

c. Decreases

d. Increases

Ans. c

11. MAC is designed for , hence known as an energy efficient protocol.

a. Fast processing

b. Communication

c. Sensing accurately

d. Powe supply coordination

Ans. d

12. 6LoWPAN is a ___________ layer protocol.

a. Physical

b. Network

c. Transport

d. Application

Ans. b

13. _this is a WSN in which nodes are mobile and can change location based on their own or due to environmental changes.

a. Sensor network

b. Mobile sensor network

c. Adhoc network

d. Local area network

Ans. b

14. …….protocol also contributes in successfully operating & networking nodes.


b. Preamble sampling

c. UDP


Ans. b

15. 6LoWPAN is specially designed for ____ devices where communication overhead should be less.

a. High power devices

b. Large size devices

c. Lower powered devices

d. Low weight devices

Ans. c

16. The open loop transfer function of a plant is given as, G(s) = 1/s2-1. If the plant is operated in unity feedback configuration, then the lead compensator that can stabilize the control system is:

a. 10(s+4)/(s+2)

b. 10(s+2)/(s+10)

c. 10(s+2)/(s+10)

d. 10(s-1)/(s+2)

Ans. d

17 The Static system can be defined as:

a. Output of a system depends on the present as well as past input.

b. Output of a system depends only on the received inputs.

c. Output of the system depends on future inputs.

d. Output of the system depends only on the present input.

Ans. d

18. In control system excessive bandwidth is not employed because

a. It leads to slower time response

b. Noise is proportional to bandwidth

c. Noise is proportional to the square of the bandwidth

d. It leads to low relative stability

Ans. b

19. Which of the motions in actuators are preferred?

a. Rotary

b. Stationary

c. Non-Stationary

d. Translator

Ans. a

20. Which of the following is the input of a controller?

a. Signal of fixed amplitude not dependent on desired variable value

b. Desired variable value

c. Sensed signal

d. Error signal

Ans. d

21. What is the relation between output response and input signal in closed loop system?

a. Nonlinear

b. Linear

c. Exponential

d. Parabolic

Ans. b

22. Which of the following are the not characteristics of the closed loop systems?

a. It does not have the ability to control the system transient response

b. It does not involve I/O measurements

c. It reduces the sensitivity of plant-parameter variations

d. It does not compensate for disturbance

Ans. a

23. Sampling is necessary ____________

a. Non automated control system

b. Automated control system

c. In complex control system

d. Where high accuracy is required

Ans. d

24. The negative feedback closed-loop system was subjected to 15V. The system has a forward gain of 2 and a feedback gain of 0.5. Determine the output voltage and the error voltage.

a. 15V, 10V

b. 6V, 5V

c. 15V, 7.5V

d. 5V, 10V

Ans.c. 15V, 7.5V

25. Which protocols are used for routing?

a. BGP


c. Distance vector


Ans. b

26. The input signals to control systems are not known fully ahead of time, the characteristics of control system which suddenly strain a control system are:

a. Constant velocity and acceleration

b. Sudden shock

c. Sudden change

d. All of the mentioned

Ans. d

27. The characteristic equation of a control system is given by s(s+4)(s2+2s+s) + k(s+1) = 0. What are the angles of the asymptotes for the root loci?

a. 0°, 180°, 300°

b. 0°, 120°, 240°

c. 60°, 180°, 300°

d. 120°, 180°, 240°

Ans. c

28. 6LoWPAN works over frequency range of __________ & has data transfer rate .

a. 2.4GHz & 250Kbps

b. 900MHz & 250Kbps

c. 8.5 GHz & 600Kbps

d. 8.5GHz & 250kbps

Ans. a

29.IPv6 header required mechanism to save energy with IPv6 & LoWPAN.

a. Encryption

b. Decryption

c. Extraction

d. Compression

Ans. d

30. MQTT stands for _____

a. Message query telemetry transport

b. Message queue telemetry transport

c. Modified query telemetry transport

d. Modified queue telemetry transport

Ans. b

31. MQTT uses ____ model of communication.

a. Publish subscribe

b. Request response

c. Public response

d. Public request

Ans. a

32. Effect of feedback on sensitivity is minimum in:

a. Closed loop control system

b. Open and closed loop control systems

c. Open loop control system

d. None of the mentioned

Ans. a

33. A particular control system yielded a steady state error of 0.20 for unit step input. A unit integrator is cascaded to this system and unit ramp input is applied to this modified system. What is the value of steady-state error for this modified system?

a. 0.15

b. 0.20

c. 0.25

d. 0.10

Ans. c

34. In the communication model used by MQTT who handles the queues which manages the topics.

a. Publisher

b. Client

c. Server

d. Broker

Ans. d

35. MQTT protocol used in ______ layer.

a. Physical

b. Lata link

c. Application

d. Network

Ans. c

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