Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 27 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
2. 2.Which job needs a light sensor? (a) warn of a gas leak (b) start a fan when hot (c) spot someone walking in (d) switch on lamps at dusk
3. 3.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a motion sensor (c) a gas sensor (d) a sound sensor
4. 4.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
5. 5.🔍 Which sensor would you use to spot someone walking in? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a motion sensor
6. 6.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
7. 7.🔍 Which sensor would you use to switch on with a clap? (a) a distance sensor (b) a temperature sensor (c) a sound sensor (d) a soil moisture sensor
8. 8.Which job needs a buzzer? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) beep an alarm
9. 9.🔍 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
11. 11.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a temperature sensor (c) a rain sensor (d) a gas sensor
12. 12.⚙️ Which actuator would you use to show a status light? (a) a display (b) a pump (c) a buzzer (d) an LED
13. 13.True or false: to make a parking alarm, use a soil moisture sensor. (a) True (b) False
14. 14.🔍 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)?
15. 15.🔍 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.⚙️ What is an actuator? (a) a program (b) a sensor (c) an output that acts (d) a battery
18. 18.Which job needs a motor? (a) move water to plants (b) show the temperature (c) turn to an exact angle (d) spin a robot’s wheels
19. 19.Which job needs an LED? (a) beep an alarm (b) show a status light (c) move water to plants (d) turn to an exact angle
20. 20.Which job needs a soil moisture sensor? (a) make a parking alarm (b) water a dry plant (c) spot someone walking in (d) stop a robot near walls
21. 21.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a buzzer (c) a servo motor (d) a motor
22. 22.🔍 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a sound sensor (c) a rain sensor (d) a temperature sensor
24. 24.True or false: to close a window in rain, use a distance sensor. (a) True (b) False
25. 25.🔍 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.⚙️ Which actuator would you use to spin a robot’s wheels? (a) an LED (b) a display (c) a pump (d) a motor
27. 27.True or false: to measure classroom noise, use a light sensor. (a) True (b) False
28. 28.Which job needs a rain sensor? (a) make a parking alarm (b) switch on with a clap (c) close a window in rain (d) start a fan when hot
29. 29.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a motor (c) a servo motor (d) a display
30. 30.True or false: to warn of a gas leak, use a distance sensor. (a) False (b) True
31. 31.🔍 Which sensor would you use to start a fan when hot? (a) a distance sensor (b) a rain sensor (c) a temperature sensor (d) a light sensor
32. 32.Which job needs a light sensor? (a) water a dry plant (b) keep an incubator warm (c) open blinds at sunrise (d) close a window in rain
33. 33.🔍 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.⚙️ Which actuator would you use to move water to plants? (a) a servo motor (b) a pump (c) a display (d) a motor
35. 35.True or false: to start a fan when hot, use a temperature sensor. (a) True (b) False
36. 36.🔍 Which sensor would you use to keep an incubator warm? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a light sensor
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a temperature sensor (c) a soil moisture sensor (d) a gas sensor
38. 38.🔍 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?
39. 39.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
40. 40.Which job needs a distance sensor? (a) close a window in rain (b) keep an incubator warm (c) start a fan when hot (d) make a parking alarm

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