Arduino Questions and Answers – GSR Sensor

This set of Arduino Multiple Choice Questions & Answers (MCQs) focuses on “GSR Sensor”.

1. What is the use of the GSR Sensor?
a) Monitors electrodermal activity
b) Monitors skin capacitance
c) Monitors skin temperature
d) Monitors heartbeat
View Answer

Answer: a
Explanation: The GSR Sensor stands for Galvanic Skin Response Sensor. This sensor can monitor the electrical conductance or the electrodermal activity and help us classify the emotion of a person.

2. How many pins are present in the GSR Sensor?
a) 1
b) 4
c) 10
d) 5
View Answer

Answer: b
Explanation: The GSR Sensor has 4 pins. These are the Vcc for powering the sensor, GND for completing the circuit, and SIG and NC being the data pins.

3. What kind of output does the SIG pin give?
a) Analog
b) Digital
c) PCM
d) TDM
View Answer

Answer: a
Explanation: The SIG pin gives us the actual data received by the sensor, and since the value can fluctuate very easily it is an Analog pin.

4. What will happen if we supply a voltage of 25V to the Vcc of the GSR Sensor?
a) Damage is caused
b) Module will shut down
c) Module will not respond for the time the voltage is applied
d) Module will function normally
View Answer

Answer: a
Explanation: The GSR Sensors are mostly built to work on a voltage range of approximately 3.3V to 5V. Any voltage lower than that and the sensor will not be able to power on, but however any voltage significantly above that and the sensor may suffer permanent damage.

5. How many electrodes does the GSR Sensor need?
a) 1
b) 3
c) 5
d) 2
View Answer

Answer: d
Explanation: The GSR Sensor needs 2 electrodes to complete the circuit with your body in order to obtain a reading. The sensor records the resistance formed by the load that is your body and outputs the data to the A0 or the SIG pin.
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6. What is the optimum current that is required to operate the GSR Sensor?
a) 20 mA
b) 15 mA
c) 200 A
d) 1 A
View Answer

Answer: b
Explanation: The current rating on any Sensor is given so that users can know what is the optimum current that needs to be fed to the active sensor such that the internal electronics is not destroyed by excess current.

7. What kind of sensor is the GSR Sensor?
a) Passive
b) Active
c) Radio
d) Pressure based
View Answer

Answer: b
Explanation: The GSR sensor is an active sensor since it requires an active DC voltage source to function properly. On the contrary, an LDR can be said to be a sort of a passive sensor since it does not require the input of current from an external source for its working.

8. What can the GSR Sensor’s function be applied to?
a) Sleep Analysis
b) Heat Generation
c) Injury Detection
d) Physical health issues
View Answer

Answer: a
Explanation: The GSR Sensor gives the electrodermal activity of the person in the form of a convenient number. So, in real time it can be used to track sleep defects in patients.

9. What is the unit for skin conductance?
a) Mega Siemens
b) Deca Siemens
c) Micro Siemens
d) Octa Siemens
View Answer

Answer: c
Explanation: The unit of skin conductance is micro Siemens. It works by applying a very small voltage across the two terminals of the sensor and then recording the current passing through the body.

10. What voltage is applied between the two electrodes or terminals of the GSR Sensor?
a) 1 V
b) 0.5V
c) 330 mV
d) 10 V
View Answer

Answer: b
Explanation: A voltage of 0.5 v is applied across the terminals and the current passing through the body is recorded and finally the value of EDA is calculated.

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Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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