Category: IOT Objective Questions

IOT Multiple Choice Questions on “Humidity Sensor”.

1. DHT11 is __________ sensor.
a) Proximity sensor
b) Humidity sensor
c) Touch sensor
d) Pressure sensor

Answer: b
Clarification: We can read data from any sensor and analyse it graphically from anywhere in the world. Here, we can read temperature and humidity data from DHT11 sensor and upload it to a Think speak cloud using Arduino Uno.

2. What is ESP8266?
a) Sensor
b) WIFI module
c) Board
d) USB cable

Answer: b
Clarification: ESP8266 is a WIFI module, which is serial. And also it is small, cheap, and easy to use.

3. What is humidity sensor?
a) Hygrometer
b) Gyroscope
c) Sesimoscope
d) Sundial

Answer: a
Clarification: A hygrometer is an instrument used for measuring the water vapor in the atmosphere. Humidity measurement instruments usually rely on measurements of some quantity such as temperature, pressure, mass or a mechanical or electrical change.

4. Units for Humidity sensor____________
a) Dew/fost point or Relative Humidity
b) Relative Humidity or Parts Per Million
c) Dew/fost point or Parts Per Million
d) Dew/fost point or Parts Per Million or Relative Humidity

Answer: d
Clarification: Most commonly units for humidity measurement are Relative Humidity(RH), DEW/Fost point (D/F PT) and Parts Per Million(PPM). RH is a function of temperature. DEW/Fost point is a function of the pressure of the as but is independent of temperature and is therefore defined as absolute humidity measurement of temperature. PPM is also an absolute measurement.

5. Dew point and Fost point are mainly used in which conditions?
a) Water vapor
b) Pressure of gas
c) Dryness of gas
d) Moisture in gas

Answer: c
Clarification: Dew point and Fost point are often used when the dryness of the gas is important. Dew point is also used as an indicator of water vapor in high temperature processes, such as industrial drying.

6. Units for Absolute Humidity is ________
a) grams/m³
b) % by volume
c) PPMV
d) %

Answer: a
Clarification: Absolute Humidity is defined as ratio of mass (vapor) to volume and has units of grams/m³.

7. Units for Due point is _______
a) gram/m³
b) % by volume
c) PPMV
d) ^oC

Answer: d
Clarification: Dew point is defined as temperature at which the water vapor in a gas condenses to liquid water and has a units of ^oC.

8. Humidity sensors are divided into how many types and depending on what?
a) 2 types depending on output
b) 2 types depending on measurement units
c) 3 types depending on measurement units
d) 3 types depending on output

Answer: b
Clarification: According to the measurement units, humidity sensors are divided into two types: Relative Humidity(RH), and Absolute Humidity(moisture) sensors. Most humidity sensors are relative humidity sensors and use different sensing principles.

9. Electronic type hygrometers are divided into how many types?
a) 5 types
b) 3 types
c) 4 types
d) 2 types

Answer: d
Clarification: Electronic type hygrometers or humidity sensors can broadly divided into two categories: one employs capacitive sensing principle, while other use resistive effects.

10. Relative humidity is a function of ________
a) Ambient temperature
b) Water vapor pressure
c) Ambient temperature and Water vapor pressure
d) Dryness

Answer: c
Clarification: Relative humidity is a function of both ambient temperature and water vapor pressure. Therefore there is a relationship between relative humidity, the amount of moisture present in the sensor, and sensor capacitance. This relation governs the operation of a capacitive humidity instrument.

11. Which sensors measure the moisture level using humidity?
a) Capacitive Sensor
b) Resistive Sensor
c) Thermal Conductivity
d) Both resistive and conductive

Answer: a
Clarification: These sensors measure moisture levels using a humidity dependent condenser; they are suitable for RH range and condensation tolerance. These sensors are commonly used in industrial and commercial environments.

12. ________ sensors measure the electrical change in devices such as conductive polymers.
a) Capacitive Sensor
b) Resistive Sensor
c) Thermal Conductivity
d) Both resistive and conductive

Answer: d
Clarification: These sensors can measure the electrical change in devices such as conductive polymers and treated substrates. They are suitable for use in residential and commercial environments.

13. ________ sensors are suitable for environments that have high temperatures.
a) Capacitive Sensor
b) Resistive Sensor
c) Thermal Conductivity
d) Both resistive and conductive

Answer: c
Clarification: These sensors are suitable for use in environments that have high temperatures. They measure humidity by calibrating the difference between the thermal conductivity of dry air and that of moist air.

14. Are capacitive sensors linear?
a) True
b) False

Answer: a
Clarification: Capacitive type sensors are linear and hence can measure RH from 0% to 100%, but require complex circuit and also need regular calibration.

15. Capacitive RH sensors dominate __________ measurements.
a) Atmospheric
b) Process
c) Both atmospheric and process
d) Neither atmospheric nor process

Answer: c
Clarification: Capacitive RH sensors dominate atmospheric and process measurements and are the only types of full range RH measuring devices capable of operating accurately down to 0% RH.

IOT Multiple Choice Questions on “MAC Address”.

1. Hardware address is known as _________
a) MAC address
b) IP Address
c) Network Interface Card
d) Address Resolution Protocol

Answer: a
Clarification: Along with an IP address there is also a hardware address. Typically it is tied to a key connection device in your computer called the network interface card. Every NIC has a hardware address that’s known as MAC, for Media Access Control.

2. MAC stands for ________
a) Media Area Control
b) Memory Access Control
c) Memory Area Control
d) Media Access Control

Answer: d
Clarification: MAC, for Media Access Control. Where IP addresses are associated with TCP/IP, MAC address are linked to the hardware of the network adapters.

3. What translates IP address into MAC address?
a) Organizationally Unique Identifier
b) Address Resolution Protocol
c) Network Interface Card
d) Burned In Address

Answer: c
Clarification: A MAC address is given to an adapter when it is manufactured. It is hardwired or hard-coded onto your computer’s NIC and it is unique to it. Something called the ARP (Address Resolution Protocol) translates an IP address into MAC address.

4. Networking Hardware Address is referred with ________
a) IP address
b) MAC address
c) NIC
d) Organizationally Unique Identifier

Answer: b
Clarification: Hardware and software working together, IP address and MAC address working together. For this reason, the MAC address is sometimes referred to as a networking hardware address, the burned in address or the physical address.

5. Does MAC address contain characters.
a) True
b) False

Answer: a
Clarification: The MAC address itself doesn’t look anything like an IP address. The MAC address is a string of usually six sets of two digits or characters, separated by colons.

6. MAC addresses are very useful in diagnosing network issues.
a) True
b) False

Answer: a
Clarification: MAC addresses are very useful in diagnosing network issues, such as problems with IP address. They are useful for network diagnosis because they never change, as opposed to a dynamic IP address, which can change from time to time.

7. On wireless networks ________ filtering is the security measure.
a) OUI
b) IP
c) NIC
d) MAC

Answer: d
Clarification: On wireless networks, a process called MAC filtering is a security measure to prevent unwanted network access by hackers and intruders. In MAC address filtering, the router is configured to accept traffic only from specific MAC addresses.

8. MAC addresses are used as ________
a) Network addresses
b) IP address
c) Hardware address
d) Burned in address

Answer: a
Clarification: MAC address is used as a network address for most IEEE 802 network technologies, including Ethernet and Wi-Fi. Logically, MAC addresses are used in the media access control protocol sub layer of the OSI model.

9. IEEE standards for Institute of Electrical and Electronics Engineers.
a) False
b) True

Answer: b
Clarification: MAC addresses are formed according to the rules of one of three numbering name spaces managed by the Institute of Electrical and Electronics Engineers(IEEE).

10. The original IEEE 802 MAC address comes from________
a) MAC address
b) IP address
c) Ethernet address
d) Http

Answer: c
Clarification: The original IEEE 802 MAC address comes from the original Xerox Ethernet addressing scheme. This 48-bit address space contains potential 242 or 281,474,976,710,656 possible MAC addresses.

IOT Multiple Choice Questions on “Publishing Messages with Commands”.

1. What is the java extension file in IoT?
a) .jar
b) .c
c) .exe
d) .py

Answer: a
Clarification: Java IDE to run the example in any computer or build .jar file with all the dependencies included and launch it any computer or devices that you want to use as the MQTT client with a command similar to the following line.

2. Do we run our program in the same computer where we have written?
a) True
b) False
c) May or may not
d) Cannot be determined

Answer: c
Clarification: In case you don’t run the example in the same computer in which you are running the MQTT server, remember to change the value for the mqttServerHost string in the main method of the Main class.

3. Publish command message is sent from _________
a) Only publisher to broker
b) Only broker to publisher
c) Publisher to broker and broker to publisher
d) Server to client

Answer: c
Clarification: The public command message is sent from a publisher to a broker or from a broker to a subscriber, to publish information on a specified topic or topics.

4. The message is sent to the input queue of a message flow that contains a _________
a) Subscriber
b) Server
c) Publication node
d) Client

Answer: d
Clarification: Message is sent to the input queue of a message flow that contains a publishing node. Authority to put a message into the queue and to publish on the specified topic.

5. Does user has authority for all topics.
a) True
b) False

Answer: b
Clarification: If the user has no authority on topic a warning response will come which indicates which are not published, if not those topics are published.

6. ROSTOPIC uses _________ at the command line for representing the content of the message.
a) YAML_syntax
b) rostopic bw
c) rostopic delay
d) rostopic echo

Answer: a
Clarification: ROSTOPIC uses YAML_syntax at the command line for representing the content of the message. For information on how to use this YAML syntax for commands like rostopic pub.

7. Which command displays the band width?
a) rostopic hz
b) rostopic delay
c) rostopic echo
d) rostopic bw

Answer: d
Clarification: Rostopic bw displays the bandwidth. The bandwidth reported is the received bandwidth. If there are network connectivity issues or rostopic cannot keep up with the publisher.

8. rostopic delay will provide delay for ___________
a) Topics which has header
b) Topics which has tail
c) Topics which has tail and head
d) To all topics

Answer: a
Clarification: Rostopic delay display the delay for topic which has header. Rostopic is implemented in python.

9. Which command displays messages published to a topic?
a) rostopic bw
b) rostopic delay
c) rostopic echo
d) rostopic hz

Answer: c
Clarification: Rostopic echo displays messages published to a topic. Rostopic is implemented in python.

10. Which command finds out the topic?
a) rostopic bw
b) rostopic delay
c) rostopic echo
d) rostopic find

Answer: d
Clarification: Rostopic find, finds topics by type. Rostopic is implemented in python. ROSTOPIC uses YAML_syntax at the command line

IOT Multiple Choice Questions on “Collaborative Robotics”.

1. Collaborative robots are easily integrated into existing production environment. With __________ articulation points.
a) 4
b) 5
c) 6
d) 3

Answer: c
Clarification: Our three different Collaborative robots are easily integrated into existing production environment. 6 articulation points and a wide scope of flexibility.

2. The collaborative robot arms are designed to mimic the range of motion of a ________
a) Network
b) Machine arm
c) Device
d) Human arm

Answer: d
Clarification: The collaborative robot arms are designed to mimic the range of motion of a human arm.

3. In co – robot co represents?
a) Coordinative
b) Collaborative
c) Computer
d) Control

Answer: b
Clarification: A cobot or co-robot is a robot intended to physically interact with humans in a shared workspace.

4. A cobots as an apparatus and method for interaction between ________ and ________
a) person and computer
b) Device and computer
c) Device and human
d) Human and

Answer: a
Clarification: A cobots as an apparatus and method for direct physical interaction between a person and a general purpose manipulator controlled by a computer.

5. The cobots assured human safety by having no internal source of ________
a) General motors
b) Safe equipment
c) Industrial material
d) Motive power

Answer: d
Clarification: The first cobots assured human safety by having no internal source of motive power. It is a natural agent, used to impact motion to machinery such as engine.

6. Motive power was provided by the human worker.
a) True
b) False

Answer: a
Clarification: The first cobots assured human safety by having no internal source of motive power. Motive power was provided by the human worker.

7. Cobots function was to allow computer control of motion by ________
a) Motors
b) Human worker
c) Payload
d) Power

Answer: c
Clarification: Cobots function was to allow computer control of motion, by redirecting or steering a payload, in a cooperative way with human worker. Later cobots provided limited amounts of motive power as well.

8. IAD stands for ________
a) Intelligent Assist Device
b) Industrial Assist Device
c) International Assist Device
d) Informative Assist Device

Answer: a
Clarification: The general motors team used the term Intelligent Assist Device as an alternative to cobot, especially in the context of industrial material handling and automotive assembly operations.

9. Cobots is also called as _______
a) ICD
b) IBD
c) IMD
d) IAD

Answer: d
Clarification: The general motors team used the term Intelligent Assist Device as an alternative to cobot, especially in the context of industrial material handling and automotive assembly operations.

10. BAXTER is which type of robot?
a) Humanoid robot
b) Industrial robot
c) Hospital robot
d) Workspace robot

Answer: b
Clarification: Universal robots released its first cobot, in 2008. Rethink Robotics released an industrial cobot, Baxter, in 2012.

11. ________ is the simplest method of collaborative robots and is used in applications when human interaction with robot is less.
a) Self monitored stop
b) Speed and separation monitoring
c) Power and force limiting
d) Hand guiding

Answer: a
Clarification: Self monitored stop is the simplest method of collaborative robots and is used in applications when human interaction with robot is less.

12. Which type of collaborative robot installation also traditional industrial robots?
a) Self monitored stop
b) Speed and separation monitoring
c) Power and force limiting
d) Hand guiding

Answer: b
Clarification: This type of collaborative robot installation also uses traditional industrial robots, but it is more suited for environments where employees will be frequently interacting with the robot.

13. _________ robots are the most collaborative of the types.
a) Self monitored stop
b) Speed and separation monitoring
c) Power and force limiting
d) Hand guiding

Answer: c
Clarification: Power and force limiting robots are the most collaborative of the types mentioned and they are the only ones that can truly work alongside humans without any additional safety devices and process interruption.

14. __________ robot allows a programmer to teach robot paths and positions.
a) Self monitored stop
b) Speed and separation monitoring
c) Power and force limiting
d) Hand guiding

Answer: d
Clarification: Hand Guiding is a collaborative feature that some robots have. It allows a programmer to teach robot paths and positions simply by moving the robot their hand to the desired positions.

15. All collaborative robot applications should follow ISO 10218.
a) True
b) False

Answer: a
Clarification: All collaborative robot applications should follow ISO 10218. However, not all processes are applicable to collaborative robots, which is why a risk assessment needs to be done.

IOT Multiple Choice Questions on “Galileo Gen 2 Board”.

1. Galileo Gen 2 board was developed by which company?
a) Atmel
b) Intel
c) Motorola
d) Dallas

Answer: b
Clarification: Intel Galileo is the first in the line of boards based on intelx86 architecture and is designed for education communities.

2. Galileo gen 2 board is some time called as Breakout Board?
a) True
b) False

Answer: a
Clarification: It is named as Breakout Boards.

3. Intel Galileo has the main feature of?
a) Support PCI Express
b) Intel Quart
c) Support for openCV
d) Onboard real time clock

Answer: b
Clarification: Intel Galileo features the Intel quart SoC X1000, the first product from the Intel Quart technology family of low power, small-core products. Intel Quart represents Intel’s attempt to compete within markets such as the Internet of Things and Wearable Computing.

4. Which among the following is more powerful?
a) Rasberry Pi 2 Model
b) Rasberry Pi 3 Model
c) Galieo Gen 2 Board
d) Galieo Gen 1 Board

Answer: b
Clarification: The latest iteration, the Pi 3 Model B, replaced the PI 2 Model B. It is more powerful than the older Galieo Gen 2, featuring a 1.2 GHz CPU and 1 Gb RAM. The Pi, however, does not have any flash memory.

5. Periferal Component Interconnect (PCI) Express interconnects which modules?
a) Serial communication
b) WIfi, Bluetooth, GSM cards
c) Micro SD card
d) Real Time Clock

Answer: b
Clarification: PCI is a high speed serial computer expansion bus standard. It includes higher maximum system bus throughput, lower I/O pin count and smaller physical footprint.

6. What is the frequency of the Galileo gen 2 board?
a) 250MHz
b) 400MHz
c) 450MHz
d) 300MHz

Answer: b
Clarification: The frequency of the board gives the speed of operation of board. So, increase in frequency increases the speed.

7. The 10/100Mbit Ethernet support enables the board to connect to _________
a) LAN
b) MAN
c) WAN
d) WLAN

Answer: a
Clarification: The 10/100 Mbit Ethernet support enables the board to be connected to a LAN. It also enables to accessing the linux shell.

8. What is the range of microSD card that is connected externally?
a) 16GB
b) 32Gb
c) 8Gb
d) 64Gb

Answer: b
Clarification: The external Micro SD card has a range of 32Gb.

9. Which of the following has a real time clock?
a) Galileo Gen 2
b) Rasberry Pi
c) Arduino
d) Rasberry Pi 3

Answer: a
Clarification: The Rasberry Pi, as well as most Arduino, does not have an on board real time clock. The Galileo boards have a real time clock, requiring only a 3V coin cell battery. The boards can therefore keep accurate time without being connected to either a power source or internet.

10. Which bus is a standard bus derived by ARM with aim to support efficient on chip?
a) Serial Attached SCSI
b) Futurebus
c) Advanced Micro Bus
d) Scalable Coherent Interface

Answer: c
Clarification: AMB is used for simple cost effective design transfer, pipelined transfer operation, and multiple bus masters. It is known for high performance and high clock synthesizable design, providing high bandwidth channel between processor and peripherals.

11. How many digital I/O pins are there in Board?
a) 29
b) 15
c) 25
d) 20

Answer: d
Clarification: Android compatible header containing 20 digital I/O pins in which 12 are fully native speed.

12. Does the board has UART?
a) True
b) False

Answer: a
Clarification: Galileo Gen 2 board has 2 UARTs, one shared with console UART. Serial console UART header is compatible with FTDI USB converter.

13. What is the storage memory of EEPROM?
a) 16kb
b) 6kb
c) 8kb
d) 12kb

Answer: c
Clarification: The EEPROMs memory is 8kb while it has external SD card option of 32GB.

14. What is the USB version that is supported?
a) USB 4.0
b) USB 1.5
c) USB 3.0
d) USB 2.0

Answer: d
Clarification: In addition to android hardware and software compatibility, the Intel Galileo board includes the following industry standards I/O ports and features: USB 2.0 Host port and USB 2.0 Client port.

15. ________ bit PWM for more precise control of servos and smoother response.
a) 14-bit
b) 12-bit
c) 8-bit
d) 6-bit

Answer: b
Clarification: 12-bit PWM for more precise control of servos and smoother response.

IOT Multiple Choice Questions on “Proximity Sensor”.

1. Which sensor can detect nearby objects?
a) Proximity sensor
b) Humidity sensor
c) Touch sensor
d) Pressure sensor

Answer: a
Clarification: A proximity sensor is a sensor able to detect the presence of nearby objects without any physical contact. A proximity sensor often emits an electromagnetic field or a beam of electromagnetic radiation, and looks for a change in the return signal.

2. The monitoring of machines, gears and objects are achieved by which sensor?
a) Humidity sensor
b) Proximity sensor
c) Touch sensor
d) Pressure sensor

Answer: b
Clarification: The monitoring of machines, gears and objects are achieved precisely by the IOT(INTERNET OF THINGS) wireless proximity sensors. They use in industries ranging from robotics to machine tools, from measuring instruments to assembly lines, from food sector to chemical industry, etc.

3. Which proximity sensor detects metal objects?
a) Capacitive Proximity Sensor
b) Magnetic Proximity Sensor
c) Ultrasonic Proximity Sensor
d) Inductive Proximity Sensor

Answer: d
Clarification: Different proximity sensor targets demand different sensors. The different types of proximity sensors are: Inductive, Capacitive, Ultrasonic, Photoelectric, Magnetic, etc.

4. Which proximity sensor indicates level?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Magnetic Proximity Sensor
d) Ultrasonic Proximity Sensor

Answer: a
Clarification: Capacitive Proximity Sensor indicates level and the fill amount present in containers, behind covering. They are used to track all objects including non-metallic ones.

5. Which proximity sensors are used in automotive?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Magnetic Proximity Sensor
d) Ultrasonic Proximity Sensor

Answer: d
Clarification: They are widely used in automotive such as parking sensors. Ultrasonic Proximity Sensors are used in automotive.

6. Which proximity sensor detects positioning of an object?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Optical Proximity Sensor
d) Magnetic Proximity Sensor

Answer: c
Clarification: They recognize, for non-contact and precisely, the positioning of the object.

7. Are proximity sensors used in retail settings?
a) True
b) False

Answer: a
Clarification: A retailer can use a customer’s proximity to a product to send deals and coupons directly to their smart phone.

8. VCNL4100CT allows the proximity detection up to________
a) 2 meter
b) 1 meters
c) 0.5 meters
d) 1.5 meters

Answer: b
Clarification: VCNL4100CT expand the range of applications by introducing a high-power IR emitter that allows proximity detection up to one meter.

9. Which protocol is used by proximity sensor?
a) I2C
b) SPI
c) UART/USART
d) CAN

Answer: a
Clarification: Microcontroller communication is via standard I2C, where the host can set measurement parameters and request results. If desired, programmable threshold allow the VCNL4100 to interrupt the host once threshold values are crossed, thereby minimizing device polling.

10. Does proximity sensor have a temperature sensor in it?
a) True
b) False

Answer: a
Clarification: A buit-in temperature sensor is used by the signal processing circuitry to provide stable outputs across the temperature range -40 ^oC to +85^oC.

11. Which device generates output signal when metal objects are either inside or entering into sensing area.
a) Capacitive Proximity
b) Magnetic Proximity
c) Inductive proximity
d) Parallel Proximity

Answer: a
Clarification: Device which generates output signal electrical signal when metal objects are either inside or entering into its sensing area from an direction.

12. ________ detects metals but along with it can also detect resins, liquids.
a) Inductive proximity
b) Capacitive Proximity
c) Magnetic Proximity
d) Parallel Proximity

Answer: b
Clarification: Capacitive Proximity can also detect metals but along with it can also detect resins, liquids, powders, etc. This sensor working can vary accordingly covering material, cable longness, noise sensitivity.

13. _________ sensors have no electrical noise effect and it can work DC.
a) Inductive proximity
b) Capacitive Proximity
c) Magnetic Proximity
d) Parallel Proximity

Answer: c
Clarification: Magnetic proximity sensors have no electrical noise effect and it can work on DC, AC, AC/DC.

14. What is the sensing range for magnetic proximity sensors?
a) 120mm
b) 90mm
c) 150mm
d) 100mm

Answer: a
Clarification: Magnetic proximity sensors have no electrical noise effect and it can work on DC, AC, AC/DC. These types of sensors have highest sensing range upto 120mm.

15. What is the sensing range for capacitive proximity sensors?
a) 150mm
b) 25mm
c) 120mm
d) 100mm

Answer: c
Clarification: Capacitive Proximity can also detect metals but along with it can also detect resins, liquids, powders, etc. This sensor working can vary accordingly covering material, cable longness, noise sensitivity.Its maximum range of sensing is 25mm.