Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 202 · 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 job needs a temperature sensor? (a) switch on with a clap (b) stop a robot near walls (c) make a parking alarm (d) start a fan when hot
2. 2.Which job needs a soil moisture sensor? (a) close a window in rain (b) open blinds at sunrise (c) water a dry plant (d) start a fan when hot
3. 3.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a motor (c) a buzzer (d) a display
4. 4.⚙️ Which actuator would you use to open a gate to 90°? (a) an LED (b) a servo motor (c) a display (d) a buzzer
5. 5.🔍 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) an output (d) a fuse
7. 7.🔍 Which sensor would you use to make a parking alarm? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a rain sensor
8. 8.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) beep an alarm (d) open a gate to 90°
9. 9.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
10. 10.🔍 Which sensor would you use to water a dry plant? (a) a soil moisture sensor (b) a light sensor (c) a motion sensor (d) a rain sensor
11. 11.🔍 Which sensor would you use to spot someone walking in? (a) a gas sensor (b) a soil moisture sensor (c) a temperature sensor (d) a motion sensor
12. 12.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
13. 13.🔍 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)?
14. 14.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a gas sensor (c) a temperature sensor (d) a rain sensor
15. 15.True or false: to spot someone walking in, use a sound sensor. (a) True (b) False
16. 16.🔍 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
17. 17.⚙️ What is an actuator? (a) a sensor (b) a battery (c) a program (d) an output that acts
18. 18.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a soil moisture sensor
19. 19.Which job needs a gas sensor? (a) make a parking alarm (b) water a dry plant (c) measure classroom noise (d) warn of a gas leak
20. 20.Which job needs a temperature sensor? (a) keep an incubator warm (b) spot someone walking in (c) switch on lamps at dusk (d) close a window in rain
21. 21.🔍 Which sensor would you use to switch on lamps at dusk? (a) a motion sensor (b) a gas sensor (c) a sound sensor (d) a light sensor
22. 22.🔍 Which sensor would you use to warn of a gas leak? (a) a sound sensor (b) a soil moisture sensor (c) a rain sensor (d) a gas sensor
23. 23.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) show a status light (d) show the temperature
24. 24.Which job needs a sound sensor? (a) measure classroom noise (b) keep an incubator warm (c) water a dry plant (d) spot someone walking in
25. 25.True or false: to switch on with a clap, use a sound sensor. (a) True (b) False
26. 26.⚙️ Which actuator would you use to turn to an exact angle? (a) a motor (b) a servo motor (c) a buzzer (d) a pump
27. 27.🔍 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?
28. 28.Which job needs a light sensor? (a) switch on with a clap (b) keep an incubator warm (c) close a window in rain (d) switch on lamps at dusk
29. 29.🔍 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?
30. 30.⚙️ Which actuator would you use to beep an alarm? (a) an LED (b) a display (c) a buzzer (d) a pump
31. 31.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a buzzer (c) a pump (d) a motor
32. 32.🔍 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)?
33. 33.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a distance sensor (c) a gas sensor (d) a motion sensor
34. 34.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
35. 35.True or false: to water a dry plant, use a sound sensor. (a) False (b) True
36. 36.Which job needs a distance sensor? (a) warn of a gas leak (b) close a window in rain (c) make a parking alarm (d) switch on lamps at dusk
37. 37.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
38. 38.True or false: to keep an incubator warm, use a light sensor. (a) False (b) True
39. 39.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
40. 40.Which job needs a sound sensor? (a) switch on with a clap (b) switch on lamps at dusk (c) start a fan when hot (d) water a dry plant

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