Q1). What are the most used sensors types in IoT
Temperature sensors
Proximity sensor
Pressure sensor
Gas sensor
Smoke sensor
IR sensors
Motion detection sensors
Q2). How did you detect fire, which sensor is suitable?
I will use a smoke sensor which detects fire and smoke
Q3). How did you measure the voltage using sensors?
I will use Thermocouples which is used for measuring the voltage.
Q4). How did the Thermocouples work?
It will be measuring the temperature with a change in voltage if temperature increases thermocouples output voltage will be increased
Q5). What are the sensors can be used in Agriculture?
1.soil moisture sensor
2.Airflow sensors
3.Electrochemical sensors
Q6). What is the purpose of Airflow sensors?
It used to measure the air level in the soil, we can measure it from the one location or dynamically get from multiple places from the garden.
Q7). How to did you make small radar? is it possible?
Yes its possible, by using ultrasonic sensor we can make our own radar, which is detected object presence and distance
Q8). How did you check the quality of water?
Using Water quality sensors, I can detect the quality of water.
Q9). Can you list out some of the water sensors?
1.Total organic carbon sensor
2.Turbidity sensor
3.Conductivity sensor
4.pH sensor
Q10). Do you have a better idea for the saving electricity?
Yes I have, by using light detecting sensors we can switch off street light automatically, which saves a lot of electricity
Q11). What are suitable databases for IoT?
1. influxDB,
2. MongoDB,
3. RethinkDB,
4. SQLite
5. Apache Cassandra
and some more databases available, but these are the most used suitably for IOT
Q12). What are the features of influxDB?
–>Great support visualization tools
–>Distributed time series database
–>No external dependencies
Q13). What is mean by Arduino?
It’s a programmable my controller, it used to sense and control the electronic devices programmatically.
Q14). What is mean by Raspberry Pi?
It’s a credit card size computer, it portable we can bring everywhere. It’s run completely on open source software and nice devices for IoT projects.
Q15). Difference between Arduino and Raspberry Pi?
Arduino: A Openly programmable USB microController, it can execute only one program at a time.
Raspberry Pi: A credit card sized computer, we can run multiple programs at a time and it has more computing power compared to Arduino.
Q16). What is mean by Raspberry pi zero?
Pi zero is the latest minimized version of Raspberry Pi, it costs is only 5$.
Q17). Mostly used protocols in IOT?
MQTT protocol
XMPP
AMQP
Data Distribution Service (DDS)
Simple Text Oriented Messaging Protocol(STOMP)
Very Simple Control Protocol (VSCP)
Zigbee
wifi
Q18). What is the abbreviation of MQTT?
MQTT – Message Queue Telemetry Transport.
Q19). What is the Purpose of MQTT protocol?
Its provide the connectivity between application and middleware from net side networks to another side networks.
Q20). What is the role of publishers in IOT?
Publishers are the lightweight sensor that sends the Real-time data to middleware or intermediate devices.
Q21). Who are subscribers in IOT?
Subscribers are the application which is interested in collected real-time data from the sensors.
Q22). How did you program the Arduino?
By using Arduino IDE, I can program the Arduino. And another method I can use Node.js Johny five module to control Arduino
Q23). If its possible to control the keyboard using Arduino?
Yes, it’s possible to control the keyboard by using specialized inbuild keyboard Arduino library.
Q24). What is mean by a library in Arduino?
A library is the collection of code, which is already written for controlling the sensor or module.
Q25). How did you install a new library in Arduino?
In Arduino Select Include library from the Sketch option in Toolbar, It will open File Explorer, select library install from the location. That’s it.
Q26). Meaning of Sketch in Arduino?
In Arduino, each unit of code called as Sketch which is uploaded and run on the Board.
Q27). Its possible reduce the size of my sketch?
Yes its possible, by Removing unused libraries from the top of the code and make our code very simple and short, Then only we can reduce the size of the sketch.
Q28). How did you control the Arduino using python?
By connecting the serial port of Arduino we can control the Arduino using python. To connect the serial port we need to import a serial module in python.
Q29). List some of wearable Arduino boards?
Lilypad Arduino simple
Lilypad Arduino main board
Lilypad Arduino USB
Lilypad Arduino simple snap
Q30). How is host the web server using Arduino?
Using the Arduino Ethernet shield we can host the web server in Arduino.
Q31). What are the available models in Raspberry Pi?
Raspberry Pi 1 model B
Raspberry Pi 1 model A
Raspberry Pi 1 model B+
Raspberry Pi 1model A+
Raspberry Pi Zero
Raspberry Pi 2
Raspberry Pi 3 model B
Raspberry Pi Zero W
Q32). Real-Time usage of Raspberry Pi?
Home Automation
Internet Radio
Portable web server
Manipulating the robots
Q33). What is default operating system of Raspberry Pi, May I use any other operating systems?
Raspbian is the Default operating system os Pi, Yes we can use windows and any Linux operating systems mainly designed for Arm based devices.
Q34). Is windows support for Raspberry Pi?
Yes, windows give support for raspberry, with specially designed windows 10 IOT core.
Q35). What is the GPIO?
GPIO – General purpose input/output. Its programmable pins which may input or output pins, During runtime user, control these pin programmatically. for more details https://en.wikipedia.org/wiki/General-purpose_input/output
Q36). Which module is used to control the gpio in python?
Gpiozero is used to control the gpio pins in Raspberry Pi. By using this we can control button, LED, Robot and more things are possible.
Q37). Why should I prepare MongoDB for IOT compared to other databases?
Its the document model based storage database. Hence its faster compared to other databases, Rather than that its support more than 20 programming language support for integration.
Q38). What is the programming language supported by MongoDB?
Actionscript info,C,C#,C++,Clojure info,ColdFusion info,D info,Dart info,Delphi info,Erlang,Go info,Groovy info,Haskell,Java,JavaScript,Lisp info,Lua info,MatLab info,Perl,PHP,PowerShell info,Prolog info,Python,R info,Ruby,Scala,Smalltalk.
Q39). What is mean by aggregation in MongoDB?
Its process of data and return the computed values. for more information: https://docs.mongodb.com/manual/core/map-reduce/
Q40). Explain about sharding?
Sharding is Split data into multiple collections and store it in the multiple machines.
Q41). Explain about replication?
Replication is the act of sync data between multiple servers, which makes MongoDB as high availability.
Q42). Explain how did you store the High volume file like video or audio files into Arduino?
Using Gridfs is the specification used for storing and retrieving the audio or video file from MongoDB.
Q43). Can you write a query to insert the data into MongoDB?
db.yourIOTcollectionname.insert({location:”india”, count:”123″});
Here YourIOTcollectionname is the name of your collection.
Q44). Explain how did you insert bulk data in MongoDB, can write the query for that?
query:
var huge= db.iotCollection.initializeUnorderedBulkOp();
huge.insert({location:”India”, count:456, polls:456});
huge.insert({location:”Russia:, count:567, polls:567});
huge.insert({location:”China”, count:789, polls:789});
huge.insert({location:”USA”, count:123, polls:123});
huge.execute()
Q45). What is DB command?
DB command mentions the currently selected database name in MongoDB;
Q46). What are the layers of OSI?
Physical layer
Data link layer
Network layer
Transport layer
Session layer
Presentation layer
Application layer
Q47). List some Advance IOT projects?
Control the robot by Hand gesture (like an iron man)
Office theft prevention system
Facial recognition based intruder alert system.
Temperature sensors
Proximity sensor
Pressure sensor
Gas sensor
Smoke sensor
IR sensors
Motion detection sensors
Q2). How did you detect fire, which sensor is suitable?
I will use a smoke sensor which detects fire and smoke
Q3). How did you measure the voltage using sensors?
I will use Thermocouples which is used for measuring the voltage.
Q4). How did the Thermocouples work?
It will be measuring the temperature with a change in voltage if temperature increases thermocouples output voltage will be increased
Q5). What are the sensors can be used in Agriculture?
1.soil moisture sensor
2.Airflow sensors
3.Electrochemical sensors
Q6). What is the purpose of Airflow sensors?
It used to measure the air level in the soil, we can measure it from the one location or dynamically get from multiple places from the garden.
Q7). How to did you make small radar? is it possible?
Yes its possible, by using ultrasonic sensor we can make our own radar, which is detected object presence and distance
Q8). How did you check the quality of water?
Using Water quality sensors, I can detect the quality of water.
Q9). Can you list out some of the water sensors?
1.Total organic carbon sensor
2.Turbidity sensor
3.Conductivity sensor
4.pH sensor
 |
| IoT Experienced Level Interview Questions Answers |
Q10). Do you have a better idea for the saving electricity?
Yes I have, by using light detecting sensors we can switch off street light automatically, which saves a lot of electricity
Q11). What are suitable databases for IoT?
1. influxDB,
2. MongoDB,
3. RethinkDB,
4. SQLite
5. Apache Cassandra
and some more databases available, but these are the most used suitably for IOT
Q12). What are the features of influxDB?
–>Great support visualization tools
–>Distributed time series database
–>No external dependencies
Q13). What is mean by Arduino?
It’s a programmable my controller, it used to sense and control the electronic devices programmatically.
Q14). What is mean by Raspberry Pi?
It’s a credit card size computer, it portable we can bring everywhere. It’s run completely on open source software and nice devices for IoT projects.
Q15). Difference between Arduino and Raspberry Pi?
Arduino: A Openly programmable USB microController, it can execute only one program at a time.
Raspberry Pi: A credit card sized computer, we can run multiple programs at a time and it has more computing power compared to Arduino.
Q16). What is mean by Raspberry pi zero?
Pi zero is the latest minimized version of Raspberry Pi, it costs is only 5$.
Q17). Mostly used protocols in IOT?
MQTT protocol
XMPP
AMQP
Data Distribution Service (DDS)
Simple Text Oriented Messaging Protocol(STOMP)
Very Simple Control Protocol (VSCP)
Zigbee
wifi
Q18). What is the abbreviation of MQTT?
MQTT – Message Queue Telemetry Transport.
Q19). What is the Purpose of MQTT protocol?
Its provide the connectivity between application and middleware from net side networks to another side networks.
Q20). What is the role of publishers in IOT?
Publishers are the lightweight sensor that sends the Real-time data to middleware or intermediate devices.
Q21). Who are subscribers in IOT?
Subscribers are the application which is interested in collected real-time data from the sensors.
Q22). How did you program the Arduino?
By using Arduino IDE, I can program the Arduino. And another method I can use Node.js Johny five module to control Arduino
Q23). If its possible to control the keyboard using Arduino?
Yes, it’s possible to control the keyboard by using specialized inbuild keyboard Arduino library.
Q24). What is mean by a library in Arduino?
A library is the collection of code, which is already written for controlling the sensor or module.
Q25). How did you install a new library in Arduino?
In Arduino Select Include library from the Sketch option in Toolbar, It will open File Explorer, select library install from the location. That’s it.
Q26). Meaning of Sketch in Arduino?
In Arduino, each unit of code called as Sketch which is uploaded and run on the Board.
Q27). Its possible reduce the size of my sketch?
Yes its possible, by Removing unused libraries from the top of the code and make our code very simple and short, Then only we can reduce the size of the sketch.
Q28). How did you control the Arduino using python?
By connecting the serial port of Arduino we can control the Arduino using python. To connect the serial port we need to import a serial module in python.
Q29). List some of wearable Arduino boards?
Lilypad Arduino simple
Lilypad Arduino main board
Lilypad Arduino USB
Lilypad Arduino simple snap
Q30). How is host the web server using Arduino?
Using the Arduino Ethernet shield we can host the web server in Arduino.
Q31). What are the available models in Raspberry Pi?
Raspberry Pi 1 model B
Raspberry Pi 1 model A
Raspberry Pi 1 model B+
Raspberry Pi 1model A+
Raspberry Pi Zero
Raspberry Pi 2
Raspberry Pi 3 model B
Raspberry Pi Zero W
Q32). Real-Time usage of Raspberry Pi?
Home Automation
Internet Radio
Portable web server
Manipulating the robots
Q33). What is default operating system of Raspberry Pi, May I use any other operating systems?
Raspbian is the Default operating system os Pi, Yes we can use windows and any Linux operating systems mainly designed for Arm based devices.
Q34). Is windows support for Raspberry Pi?
Yes, windows give support for raspberry, with specially designed windows 10 IOT core.
Q35). What is the GPIO?
GPIO – General purpose input/output. Its programmable pins which may input or output pins, During runtime user, control these pin programmatically. for more details https://en.wikipedia.org/wiki/General-purpose_input/output
Q36). Which module is used to control the gpio in python?
Gpiozero is used to control the gpio pins in Raspberry Pi. By using this we can control button, LED, Robot and more things are possible.
Q37). Why should I prepare MongoDB for IOT compared to other databases?
Its the document model based storage database. Hence its faster compared to other databases, Rather than that its support more than 20 programming language support for integration.
Q38). What is the programming language supported by MongoDB?
Actionscript info,C,C#,C++,Clojure info,ColdFusion info,D info,Dart info,Delphi info,Erlang,Go info,Groovy info,Haskell,Java,JavaScript,Lisp info,Lua info,MatLab info,Perl,PHP,PowerShell info,Prolog info,Python,R info,Ruby,Scala,Smalltalk.
Q39). What is mean by aggregation in MongoDB?
Its process of data and return the computed values. for more information: https://docs.mongodb.com/manual/core/map-reduce/
Q40). Explain about sharding?
Sharding is Split data into multiple collections and store it in the multiple machines.
Q41). Explain about replication?
Replication is the act of sync data between multiple servers, which makes MongoDB as high availability.
Q42). Explain how did you store the High volume file like video or audio files into Arduino?
Using Gridfs is the specification used for storing and retrieving the audio or video file from MongoDB.
Q43). Can you write a query to insert the data into MongoDB?
db.yourIOTcollectionname.insert({location:”india”, count:”123″});
Here YourIOTcollectionname is the name of your collection.
Q44). Explain how did you insert bulk data in MongoDB, can write the query for that?
query:
var huge= db.iotCollection.initializeUnorderedBulkOp();
huge.insert({location:”India”, count:456, polls:456});
huge.insert({location:”Russia:, count:567, polls:567});
huge.insert({location:”China”, count:789, polls:789});
huge.insert({location:”USA”, count:123, polls:123});
huge.execute()
Q45). What is DB command?
DB command mentions the currently selected database name in MongoDB;
Q46). What are the layers of OSI?
Physical layer
Data link layer
Network layer
Transport layer
Session layer
Presentation layer
Application layer
Q47). List some Advance IOT projects?
Control the robot by Hand gesture (like an iron man)
Office theft prevention system
Facial recognition based intruder alert system.