Multiple Choice Questions and Answers on Sensors for IOT
Multiple Choice Questions and Answers on Sensors for IOT
Multiple Choice Questions and Answers on Temperature Sensor
1. Which sensor is used for monitor electric distribution and switching equipment temperature?
a) LM35
b) ESP8266
c) DHT11
d) RFM3200
Answer: RFM3200
2. Line of sight of wireless sensor tag is ________
a) 750ft
b) 700ft
c) 500ft
d) 550ft
Answer: 700ft
3. How many pins does temperature sensor have?
a) 5 legs
b) 2 legs
c) 4 legs
d) 3 legs
Answer: 3 legs
4. Which of the following is the Wireless battery-free sensor?
a) LM35
b) RFM3200
c) ESP8266
d) DHT11
Answer: RFM3200
5. Which sensor is linear and low accuracy?
a) Thermistor
b) Resistance Thermometer
c) Thermocouple
d) Semiconductor based sensor
Answer: Semiconductor based sensor
6. What is ESP8266?
a) WIFI module
b) Sensor
c) Board
d) USB cable
Answer: WIFI module
7. Electric motor protection has which sensor?
a) Pressure sensor
b) Touch sensor
c) Temperature sensor
d) Humidity sensor
Answer: Temperature sensor
8. What is DS18B20?
a) Pressure sensor
b) Touch sensor
c) Humidity sensor
d) Temperature sensor
Answer: Temperature sensor
9. What is STSC1?
a) Pressure sensor
b) Temperature sensor
c) Touch sensor
d) Humidity sensor
Answer: Temperature sensor
10. Which sensor is LM35?
a) Pressure sensor
b) Humidity sensor
c) Temperature sensor
d) Touch sensor
Answer: Temperature sensor
11. A ________ is thermally sensitive resistor that exhibits a large change in resistance.
a) Thermistor
b) Resistance Thermometer
c) Thermo couple
d) Semiconductor based sensor
Answer: Thermistor
12. ________ measures temperature by correlating the resistance of the RTD with temperature.
a) Thermistor
b) Resistance Thermometer
c) Thermo couple
d) Semiconductor based sensor
Answer: Resistance Thermometer
13. ________ consists of two different metals connected at two points.
a) Thermistor
b) Resistance Thermometer
c) Thermocouple
d) Semiconductor based sensor
Answer: Thermocouple
14. Which type of temperature sensor is placed in Integrated Circuits?
a) Thermistor
b) Resistance Thermometer
c) Thermocouple
d) Semiconductor based sensor
Answer: Semiconductor based sensor
15. Monnit temperature sensor is used for what?
a) Accurate results
b) To measure the temperature at high degree
c) Temperature sensor
d) Pressure sensor
Answer: Accurate results
Multiple Choice Questions and Answers on Humidity Sensor
1. Electronic type hygrometers are divided into how many types?
a) 5 types
b) 3 types
c) 4 types
d) 2 types
Answer: 2 types
2. 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: 2 types depending on measurement units
3. What is humidity sensor?
a) Hygrometer
b) Gyroscope
c) Sesimoscope
d) Sundial
Answer: Hygrometer
4. ________ 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: Both resistive and conductive
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: Dryness of gas
6. Units for Absolute Humidity is ________
a) grams/m3
b) % by volume
c) PPMV
d) %
Answer: grams/m3
7. Units for Due point is _______
a) gram/m3
b) % by volume
c) PPMV
d) oC
Answer: oC
8. Capacitive RH sensors dominate __________ measurements.
a) Atmospheric
b) Process
c) Both atmospheric and process
d) Neither atmospheric nor process
Answer: Both atmospheric and process
9. DHT11 is __________ sensor.
a) Proximity sensor
b) Humidity sensor
c) Touch sensor
d) Pressure sensor
Answer: Humidity sensor
10. Relative humidity is a function of ________
a) Ambient temperature
b) Water vapor pressure
c) Ambient temperature and Water vapor pressure
d) Dryness
Answer: Ambient temperature and Water vapor pressure
11. Which sensors measure the moisture level using humidity?
a) Capacitive Sensor
b) Resistive Sensor
c) Thermal Conductivity
d) Both resistive and conductive
Answer: Capacitive Sensor
12. 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: Dew/fost point or Parts Per Million or Relative Humidity
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: Thermal Conductivity
14. What is ESP8266?
a) Sensor
b) WIFI module
c) Board
d) USB cable
Answer: WIFI module
15. Are capacitive sensors linear?
a) True
b) False
Answer: True
Multiple Choice Questions and Answers on Pressure Sensor
1. What is the absolute pressure of c39?
a) 2.0 bar
b) 1.5 bar
c) 1.2 bar
d) 1.35 bar
Answer: 1.2 bar
2. What is the operating voltage of pressure sensor?
a) 3.5v
b) 1.5v
c) 5v
d) 3v
Answer: 3v
3. What is the stability of pressure sensor?
a) +/-0.75% FS
b) +/-0.5% FS
c) +/- 0.35% FS
d) +/-0.125% FS
Answer: +/- 0.35% FS
4. Barometer is which type of sensor________
a) Pressure sensor
b) Touch sensor
c) Temperature sensor
d) Humidity sensor
Answer: Pressure sensor
5. Touch screen devices use which sensor?
a) Touch sensor
b) Temperature sensor
c) Humidity sensor
d) Pressure sensor
Answer: Pressure sensor
6. Which sensor measure the pressure relative to atmospheric pressure?
a) Absolute pressure sensor
b) Gauge pressure sensor
c) Vacuum pressure sensor
d) Differential pressure sensor
Answer: Gauge pressure sensor
7. Which sensor measures the pressure relative to perfect vacuum?
a) Absolute pressure sensor
b) Gauge pressure sensor
c) Vacuum pressure sensor
d) Differential pressure sensor
Answer: Absolute pressure sensor
8. In which place the pressure sensor is needed for monitoring gases and their partial pressures.
a) Touch screen
b) Automotive Industry
c) Industrial
d) Aviation
Answer: Industrial
9. Which devices measures gases or liquid?
a) Proximity sensor
b) Pressure sensor
c) Temperature sensor
d) Touch sensor
Answer: Pressure sensor
10. Which pressure standard is used for gauge?
a) Dead-weight tester
b) Manometer
c) Pressure switches
d) Stain gauge pressure sensor
Answer: Manometer
11. Pressure measured relative to perfect vacuum is termed as ______
a) Absolute Pressure Measurement
b) Differential Pressure Measurement
c) Gauge Pressure Measurement
d) Both Absolute and Differential
Answer: Absolute Pressure Measurement
12. In which pressure measurement, pressure of two distinct positions are compared?
a) Absolute Pressure Measurement
b) Differential Pressure Measurement
c) Gauge Pressure Measurement
d) Both Absolute and Differential
Answer: Differential Pressure Measurement
13. ______ can be defined as a subtype of differential pressure measurement.
a) Absolute Pressure Measurement
b) Differential Pressure Measurement
c) Gauge Pressure Measurement
d) Both Absolute and Differential
Answer: Gauge Pressure Measurement
14. The computer devices and smart phones that have _______ with pressure sensor.
a) Automotive Industry
b) Industrial
c) Aviation
d) Touch screen
Answer: Touch screen
15. The feature of c39 is its low insertion height.
a) True
b) False
Answer: True
Multiple Choice Questions and Answers on Accelerometer and Gyroscope Sensor
1. Which axis accelerometer is mostly used in IOT?
a) 2- axis
b) 3- axis
c) 1- axis
d) Combination of all
Answer: 3- axis
2. What is the rate noise density of gyroscope?
a) 0.011 dps/√Hz
b) 0.0011 dps/√Hz
c) 1.11 dps/√Hz
d) 11.1 dps/√Hz
Answer: 0.011 dps/√Hz
3. What is the use of accelerometer in laptops?
a) To rotate the screen
b) To protect hard drives from damage
c) To get the angle on monitor
d) To get the linear acceleration
Answer: To protect hard drives from damage
4. Ring laser type gyroscope operates based on _________ principle.
a) Damper
b) Sagnac
c) Seismic
d) Dashpot
Answer: Sagnac
5. How many and what are the parts that are present in the accelerometer sensor?
a) 1, capacitor sensor
b) 3, piezoelectric effect, Analog display, digital display
c) 2, piezoelectric effect and capacitor sensor
d) 2, Capacitor sensor, digital Display
Answer: 2, piezoelectric effect and capacitor sensor
6. The BGM160 gyroscope sensor is fitted with ________ interfaces.
a) Only SPI
b) Only I2C
c) SPI and UART
d) SPI and I2C
Answer: SPI and I2C
7. ________ sensor is used for tracking rotation or twist.
a) Gyroscope
b) Temperature
c) Pressure
d) Proximity
Answer: Gyroscope
8. Gyroscope is used to measure_________
a) Linear Acceleration
b) Angular velocity
c) Angular velocity and linear acceleration
d) Linear velocity
Answer: Angular velocity
9. Accelerometer is the measurement of ________
a) Velocity/time
b) Energy/time
c) Height/time
d) Angle/time
Answer: Velocity/time
10. How many sensing structures are there in gyroscope sensor?
a) Two structures
b) Three structures
c) Depending on application
d) Single structure
Answer: Single structure
11. Theory behind working of accelerometer can be understood from ________
a) Rotary
b) Liner
c) Newtonian mechanism
d) Reciprocating
Answer: Newtonian mechanism
12. ________ is included in a system to provide desirable damping effect.
a) Speedometer
b) Seismic
c) Damper
d) Dashpot
Answer: Dashpot
13. Gyroscope is used for_________
a) Anti-theft
b) Capacitive proximity sensing
c) Gaming
d) Angle detection
Answer: Gaming
14. Displacement and acceleration are related by fundamental scaling law.
a) True
b) False
Answer: True
15. Are accelerometer used in cars?
a) True
b) False
Answer: True
Multiple Choice Questions and Answers on Proximity Sensor
1. What is the sensing range for magnetic proximity sensors?
a) 120mm
b) 90mm
c) 150mm
d) 100mm
Answer: 120mm
2. VCNL4100CT allows the proximity detection up to________
a) 2 meter
b) 1 meters
c) 0.5 meters
d) 1.5 meters
Answer: 1 meters
3. What is the sensing range for capacitive proximity sensors?
a) 150mm
b) 25mm
c) 120mm
d) 100mm
Answer: 120mm
4. Which proximity sensor indicates level?
a) Inductive Proximity Sensor
b) Capacitive Proximity Sensor
c) Magnetic Proximity Sensor
d) Ultrasonic Proximity Sensor
Answer: Inductive Proximity Sensor
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: Ultrasonic Proximity Sensor
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: Optical Proximity Sensor
7. Which proximity sensor detects metal objects?
a) Capacitive Proximity Sensor
b) Magnetic Proximity Sensor
c) Ultrasonic Proximity Sensor
d) Inductive Proximity Sensor
Answer: Inductive Proximity Sensor
8. 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: Proximity sensor
9. Which protocol is used by proximity sensor?
a) I2C
b) SPI
c) UART/USART
d) CAN
Answer: I2C
10. Which sensor can detect nearby objects?
a) Proximity sensor
b) Humidity sensor
c) Touch sensor
d) Pressure sensor
Answer: Proximity sensor
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: Capacitive Proximity
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: Capacitive Proximity
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: Magnetic Proximity
14. Does proximity sensor have a temperature sensor in it?
a) True
b) False
Answer: True
15. Are proximity sensors used in retail settings?
a) True
b) False
Answer: True
Multiple Choice Questions and Answers on Touch Sensor
1. How many types the capacitive touch sensors are classified?
a) 1 type
b) 2 types
c) 3 types
d) 4 types
Answer: 2 types
2. How many types of touch sensors are present?
a) 2 types
b) 3 types
c) 4 types
d) 5 types
Answer: 2 types
3. How many types of sensors are there in resistive touch sensor?
a) 2 types
b) 3 types
c) 4 types
d) 5 types
Answer: 3 types
4. Which touch screen technology is popular for its versatility?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Optical Imaging
Answer: Optical Imaging
5. Other name for tactile sensor is______________
a) Pressure sensor
b) Humidity sensor
c) Touch sensor
d) Temperature sensor
Answer: Touch sensor
6. Which touchscreen is made up a glass overlay.
a) Resistive touchscreen
b) Capacitive touchscreen
c) APR
d) SAW
Answer: APR
7. Which sensor is used in mobile phones?
a) Capacitive touch sensor
b) Temperature sensor
c) Humidity sensor
d) Weight sensor
Answer: Capacitive touch sensor
8. Which touchscreen is coated with a transparent material?
a) Capacitive touchscreen
b) SAW
c) Infrared
d) Resistive touchscreen
Answer: Resistive touchscreen
9. Which touchscreen offers 75% clarity?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Infrared
Answer: Resistive touchscreen
10. Which touchscreen is used for industrial purpose?
a) Resistive touchscreen
b) Capacitive touchscreen
c) SAW
d) Infrared
Answer: Capacitive touchscreen
11. SAW expanded as?
a) Surface Arrangement Wave
b) Screen Acoustic Wave
c) Screen Arrangement Wave
d) Surface Acoustic Wave
Answer: Surface Acoustic Wave
12. Which touchscreen technology does not incorporate an overlay.
a) Resistive touchscreen
b) Infrared
c) Capacitive touchscreen
d) SAW
Answer: Infrared
13. Are APR touch screens touch resistances?
a) True
b) False
Answer: True
14. Capacitive touch sensor has moving parts.
a) True
b) False
Answer: False
15. Resistive touch sensor is used for longer time than capacitive touch sensor.
a) True
b) False
Answer: True
Multiple Choice Questions and Answers on Analog to Digital Converter
1. How many common ways are there for implementing an ADC?
a) 2 ways
b) 5 ways
c) 8 ways
d) 10 ways
Answer: 10 ways
2. Which ADC narrows the range?
a) Flash ADC
b) Wilkinson
c) Sigma delta
d) Successive approximation
Answer: Successive approximation
3. Perfect resolution is possible when?
a) sampling rate greater than thrice the bandwidth of the signal
b) sampling rate greater than twice the bandwidth of the signal
c) sampling rate less than twice the bandwidth of the signal
d) sampling rate less than thrice the bandwidth of the signal
Answer: sampling rate greater than twice the bandwidth of the signal
4. Resolution is expressed in __________
a) Bytes
b) Bits
c) Word
d) Nibble
Answer: Bits
5. The discrete levels available are_________
a) Sides
b) Edges
c) Levels
d) Bytes
Answer: Levels
6. Resolution is expressed in terms of_________
a) Milli volts
b) Ampere
c) Milli ampere
d) Volts
Answer: Volts
7. Nyquist rate is defined as ___________
a) twice the lowest frequency
b) trice the highest frequency
c) twice the highest frequency
d) trice the lowest frequency
Answer: twice the highest frequency
8. ENOB stands for_________
a) Effective no of bits
b) Effective no of bytes
c) Efficient no of bits
d) Efficient no of bytes
Answer: Effective no of bits
9. Other name for data conversion is ________
a) Flash ADC
b) Wilkinson
c) Sigma delta
d) Ramp compare
Answer: Flash ADC
10. To avoid aliasing we use a __________ filter.
a) Digital filter
b) Aliasing filter
c) Analog filter
d) Anti-aliasing filter
Answer: Anti-aliasing filter
11. Clock jitters is caused by __________
a) Sampling rate
b) Spectrum
c) Phase noise
d) Sampling frequency
Answer: Phase noise
12. The analog signal is __________ in __________
a) Continuous, frequency
b) Continuous, time
c) Discrete, frequency
d) Discrete, time
Answer: Continuous, time
13. Sample and hold circuit is a _______ circuit.
a) Analog device
b) Digital device
c) Both analog and digital
d) Neither analog nor digital
Answer: Analog device
14. The rate of new values is called the sampling rate or sampling frequency.
a) True
b) False
Answer: True
15. Quantization is the method used for conversion?
a) True
b) False
Answer: True
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