Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 48 · 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.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a rain sensor
2. 2.🔍 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)?
3. 3.True or false: to switch on lamps at dusk, use a gas sensor. (a) True (b) False
4. 4.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
5. 5.⚙️ Which actuator would you use to show a status light? (a) a display (b) a pump (c) an LED (d) a motor
6. 6.🔍 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
7. 7.🔍 Which sensor would you use to keep an incubator warm? (a) a sound sensor (b) a rain sensor (c) a temperature sensor (d) a distance sensor
8. 8.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a gas sensor (c) a temperature sensor (d) a distance sensor
9. 9.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a power source (c) a fuse (d) an input
10. 10.🔍 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?
11. 11.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a temperature sensor (c) a rain sensor (d) a motion sensor
12. 12.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
13. 13.Which job needs a temperature sensor? (a) keep an incubator warm (b) make a parking alarm (c) open blinds at sunrise (d) warn of a gas leak
14. 14.🔍 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.🔍 Which sensor would you use to water a dry plant? (a) a distance sensor (b) a sound sensor (c) a soil moisture sensor (d) a gas sensor
16. 16.🔍 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
17. 17.⚙️ Which actuator would you use to show the temperature? (a) a buzzer (b) a pump (c) an LED (d) a display
18. 18.🔍 Which sensor would you use to warn of a gas leak? (a) a light sensor (b) a distance sensor (c) a gas sensor (d) a soil moisture sensor
19. 19.🔍 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?
20. 20.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
21. 21.Which job needs a motion sensor? (a) measure classroom noise (b) start a fan when hot (c) water a dry plant (d) spot someone walking in
22. 22.True or false: to water a dry plant, use a light sensor. (a) True (b) False
23. 23.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a light sensor (c) a gas sensor (d) a distance sensor
24. 24.Which job needs a servo motor? (a) show a status light (b) move water to plants (c) beep an alarm (d) open a gate to 90°
25. 25.Which job needs a rain sensor? (a) close a window in rain (b) keep an incubator warm (c) water a dry plant (d) switch on lamps at dusk
26. 26.🔍 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)?
27. 27.Which job needs a sound sensor? (a) measure classroom noise (b) spot someone walking in (c) close a window in rain (d) warn of a gas leak
28. 28.Which job needs a buzzer? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) beep an alarm
29. 29.🔍 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
31. 31.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
32. 32.🔍 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
34. 34.🔍 Which sensor would you use to stop a robot near walls? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a distance sensor
35. 35.🔍 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
36. 36.Which job needs a gas sensor? (a) warn of a gas leak (b) keep an incubator warm (c) start a fan when hot (d) open blinds at sunrise
37. 37.Which job needs a distance sensor? (a) stop a robot near walls (b) measure classroom noise (c) spot someone walking in (d) warn of a gas leak
38. 38.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) show the temperature (d) show a status light
39. 39.Which job needs a soil moisture sensor? (a) switch on lamps at dusk (b) keep an incubator warm (c) water a dry plant (d) measure classroom noise
40. 40.Which job needs an LED? (a) turn to an exact angle (b) show a status light (c) open a gate to 90° (d) move water to plants

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