Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 29 · 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 spot someone walking in, use a soil moisture sensor. (a) False (b) True
2. 2.True or false: to warn of a gas leak, use a motion sensor. (a) False (b) True
3. 3.🔍 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?
4. 4.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
5. 5.🔍 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
6. 6.🔍 Which sensor would you use to measure classroom noise? (a) a distance sensor (b) a light sensor (c) a sound sensor (d) a temperature sensor
7. 7.🔍 Which sensor would you use to stop a robot near walls? (a) a light sensor (b) a soil moisture sensor (c) a motion sensor (d) a distance sensor
8. 8.⚙️ What is an actuator? (a) an output that acts (b) a battery (c) a sensor (d) a program
9. 9.Which job needs a buzzer? (a) move water to plants (b) open a gate to 90° (c) beep an alarm (d) spin a robot’s wheels
10. 10.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a display (b) a servo motor (c) a pump (d) a motor
11. 11.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a temperature sensor
12. 12.🔍 Which sensor would you use to start a fan when hot? (a) a motion sensor (b) a gas sensor (c) a soil moisture sensor (d) a temperature sensor
13. 13.Which job needs a motor? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) turn to an exact angle
14. 14.Which job needs a display? (a) turn to an exact angle (b) move water to plants (c) show the temperature (d) open a gate to 90°
15. 15.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) a display (c) an LED (d) a motor
16. 16.Which job needs a soil moisture sensor? (a) keep an incubator warm (b) water a dry plant (c) measure classroom noise (d) switch on lamps at dusk
17. 17.Which job needs a rain sensor? (a) start a fan when hot (b) water a dry plant (c) switch on lamps at dusk (d) close a window in rain
18. 18.Which job needs a gas sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) warn of a gas leak (d) stop a robot near walls
19. 19.🔍 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)?
20. 20.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a rain sensor (c) a temperature sensor (d) a motion sensor
21. 21.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a distance sensor (c) a soil moisture sensor (d) a gas sensor
22. 22.Which job needs a distance sensor? (a) switch on with a clap (b) spot someone walking in (c) switch on lamps at dusk (d) stop a robot near walls
23. 23.Which job needs a distance sensor? (a) make a parking alarm (b) measure classroom noise (c) warn of a gas leak (d) open blinds at sunrise
24. 24.Which job needs a sound sensor? (a) close a window in rain (b) switch on lamps at dusk (c) measure classroom noise (d) open blinds at sunrise
25. 25.🔍 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?
26. 26.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a sound sensor (c) a temperature sensor (d) a gas sensor
27. 27.🔍 Which sensor would you use to open blinds at sunrise? (a) a temperature sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
28. 28.🔍 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
29. 29.Which job needs a light sensor? (a) make a parking alarm (b) switch on lamps at dusk (c) stop a robot near walls (d) water a dry plant
30. 30.Which job needs a motion sensor? (a) measure classroom noise (b) switch on lamps at dusk (c) switch on with a clap (d) spot someone walking in
31. 31.⚙️ Which actuator would you use to turn to an exact angle? (a) a pump (b) a servo motor (c) an LED (d) a buzzer
32. 32.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor
33. 33.🔍 A distance sensor sends a sound pulse and hears the echo 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
34. 34.🔍 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)?
35. 35.🔍 Which sensor would you use to make a parking alarm? (a) a soil moisture sensor (b) a motion sensor (c) a rain sensor (d) a distance sensor
36. 36.🔍 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)?
37. 37.Which job needs a pump? (a) beep an alarm (b) move water to plants (c) spin a robot’s wheels (d) show a status light
38. 38.🔍 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)?
39. 39.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a distance sensor (c) a motion sensor (d) a soil moisture sensor
40. 40.True or false: to stop a robot near walls, use a light sensor. (a) True (b) False

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