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    4.  Which type of sensor is used in the Automatic Streetlight project to detect light levels?

                                      (i)  IR Sensor                            (ii)  PIR Sensor

                                    (iii)  Photoresistor                      (iv)  Ultrasonic Sensor

                         5.  Choose the correct sensor used to measure distance using sound waves.

                                      (i)  Ultrasonic Distance Sensor           (ii)  Soil Moisture Sensor

                                    (iii)  Photodiode                         (iv)  PIR Sensor

                      B.  Write ‘T’ for true and ‘F’ for false.

                         1.   The microcontroller processes the signal from a sensor and can trigger
                             actions based on that signal.

                         2.   A PIR sensor can trigger actions such as turning on lights when motion

                             is detected.

                         3.   A soil moisture sensor detects the temperature of the environment.

                         4.   The processing phase of a sensor involves interpreting the signal from
                             the sensor and making decisions based on that information.

                         5.  Sensors are not used to gather information and trigger actions.

                      C.  Fill in the blanks using the given hints:

                         1.  A                 changes its resistance based on the amount of light             Hints
                             falling on it.                                                                  Conversion
                                                                                                             Photodiode
                         2.  In Tinkercad, you can use the                  feature to simulate circuits
                                                                                                               Circuits
                             and sensors.                                                                    Photoresistor

                         3.  Sensors in robotics help devices                  with their environment.         Interact

                         4.  A                 sensor generates current when exposed to light and is
                             used in optical communication.
                         5.  After a sensor detects a stimulus, the                 step involves converting the physical

                             signal into an electrical signal.

                      COMPETENCY-BASED QUESTIONS

                      1.  Maya is building a plant watering system and needs to detect soil moisture levels to trigger
                         irrigation. Which sensor should Maya use for this task?

                      2.  Ravi is building a motion detection system for a smart home project. He wants to use a sensor
                         that detects human movement. Which sensor should Ravi use?

                                     AI RoboGenius - VII
                     50

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