Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 52 · 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 measure classroom noise? (a) a light sensor (b) a gas sensor (c) a sound sensor (d) a motion sensor
2. 2.⚙️ Which actuator would you use to open a gate to 90°? (a) a servo motor (b) a display (c) an LED (d) a pump
3. 3.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
4. 4.Which job needs a display? (a) beep an alarm (b) spin a robot’s wheels (c) show the temperature (d) show a status light
5. 5.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
6. 6.Which job needs a pump? (a) show a status light (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
7. 7.🔍 Which sensor would you use to spot someone walking in? (a) a rain sensor (b) a gas sensor (c) a sound sensor (d) a motion sensor
8. 8.🔍 Which sensor would you use to make a parking alarm? (a) a distance sensor (b) a light sensor (c) a temperature sensor (d) a sound sensor
9. 9.🔍 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)?
10. 10.True or false: to close a window in rain, use a soil moisture sensor. (a) True (b) False
11. 11.Which job needs an LED? (a) beep an alarm (b) show a status light (c) move water to plants (d) spin a robot’s wheels
12. 12.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
13. 13.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) an LED (c) a buzzer (d) a display
14. 14.Which job needs a sound sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) open blinds at sunrise (d) switch on with a clap
15. 15.Which job needs a motor? (a) show the temperature (b) show a status light (c) spin a robot’s wheels (d) move water to plants
16. 16.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
17. 17.True or false: to keep an incubator warm, use a temperature sensor. (a) True (b) False
18. 18.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
19. 19.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a motor (b) an LED (c) a buzzer (d) a servo motor
20. 20.🔍 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.True or false: to spot someone walking in, use a sound sensor. (a) False (b) True
22. 22.Which job needs a buzzer? (a) show a status light (b) move water to plants (c) spin a robot’s wheels (d) beep an alarm
23. 23.Which job needs a servo motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) beep an alarm (d) move water to plants
24. 24.Which job needs a rain sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) close a window in rain (d) water a dry plant
25. 25.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a motor (c) a servo motor (d) a display
26. 26.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a light sensor (c) a temperature sensor (d) a rain sensor
27. 27.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
28. 28.Which job needs a distance sensor? (a) spot someone walking in (b) switch on with a clap (c) start a fan when hot (d) stop a robot near walls
29. 29.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
30. 30.Which job needs a light sensor? (a) stop a robot near walls (b) open blinds at sunrise (c) measure classroom noise (d) warn of a gas leak
31. 31.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a soil moisture sensor (c) a motion sensor (d) a gas sensor
32. 32.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
33. 33.🔍 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?
34. 34.🔍 Which sensor would you use to keep an incubator warm? (a) a rain sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
35. 35.🔍 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)?
36. 36.Which job needs a motion sensor? (a) stop a robot near walls (b) measure classroom noise (c) make a parking alarm (d) spot someone walking in
37. 37.🔍 Which sensor would you use to water a dry plant? (a) a temperature sensor (b) a motion sensor (c) a soil moisture sensor (d) a sound sensor
38. 38.🔍 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?
39. 39.🔍 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)?
40. 40.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a temperature sensor

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