Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 259 · 40 questions

Remember (Measure it, then move it): Match the sensor to the quantity: light, heat, distance, movement, soil wetness, sound, gas or rain. Match the actuator to the action: spin (motor), exact angle (servo), beep (buzzer), light (LED), water (pump), numbers (display). Echo distance = 17 × echo time in ms (cm), because the sound goes there and back.

1. 1.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
2. 2.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) an LED (c) a motor (d) a pump
3. 3.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.⚙️ Which actuator would you use to show a status light? (a) a pump (b) an LED (c) a servo motor (d) a buzzer
5. 5.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.Which job needs a pump? (a) move water to plants (b) show a status light (c) show the temperature (d) beep an alarm
7. 7.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
8. 8.🔍 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.True or false: to open blinds at sunrise, use a light sensor. (a) False (b) True
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an output (d) an input
11. 11.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a motion sensor (c) a gas sensor (d) a temperature sensor
12. 12.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a distance sensor (c) a temperature sensor (d) a motion sensor
13. 13.⚙️ What is an actuator? (a) a battery (b) a sensor (c) an output that acts (d) a program
14. 14.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a pump (c) a buzzer (d) a servo motor
15. 15.🔍 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.Which job needs an LED? (a) show the temperature (b) turn to an exact angle (c) show a status light (d) open a gate to 90°
17. 17.🔍 Which sensor would you use to close a window in rain? (a) a sound sensor (b) a soil moisture sensor (c) a rain sensor (d) a distance sensor
18. 18.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) a display (d) a motor
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.Which job needs a motion sensor? (a) spot someone walking in (b) open blinds at sunrise (c) make a parking alarm (d) stop a robot near walls
21. 21.True or false: to measure classroom noise, use a soil moisture sensor. (a) False (b) True
22. 22.True or false: to spot someone walking in, use a light sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a light sensor
24. 24.True or false: to water a dry plant, use a light sensor. (a) True (b) False
25. 25.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a soil moisture sensor (c) a gas sensor (d) a rain sensor
26. 26.Which job needs a light sensor? (a) measure classroom noise (b) stop a robot near walls (c) spot someone walking in (d) open blinds at sunrise
27. 27.True or false: to keep an incubator warm, use a rain sensor. (a) True (b) False
28. 28.🔍 Which sensor would you use to stop a robot near walls? (a) a sound sensor (b) a rain sensor (c) a distance sensor (d) a light sensor
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.Which job needs a light sensor? (a) keep an incubator warm (b) make a parking alarm (c) switch on lamps at dusk (d) stop a robot near walls
31. 31.🔍 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm
33. 33.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a display (c) a pump (d) an LED
34. 34.Which job needs a gas sensor? (a) keep an incubator warm (b) measure classroom noise (c) switch on with a clap (d) warn of a gas leak
35. 35.True or false: to stop a robot near walls, use a soil moisture sensor. (a) False (b) True
36. 36.🔍 Which sensor would you use to switch on lamps at dusk? (a) a temperature sensor (b) a light sensor (c) a rain sensor (d) a motion sensor
37. 37.Which job needs a motor? (a) spin a robot’s wheels (b) open a gate to 90° (c) show a status light (d) beep an alarm
38. 38.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a servo motor (c) a motor (d) a display
39. 39.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
40. 40.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

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