Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 111 · 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.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
2. 2.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) a fuse (c) a power source (d) an input
3. 3.🔍 Which sensor would you use to warn of a gas leak? (a) a rain sensor (b) a light sensor (c) a motion sensor (d) a gas sensor
4. 4.True or false: to spot someone walking in, use a distance sensor. (a) True (b) False
5. 5.🔍 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?
6. 6.🔍 Which sensor would you use to close a window in rain? (a) a rain sensor (b) a distance sensor (c) a light sensor (d) a soil moisture sensor
7. 7.True or false: to make a parking alarm, use a gas sensor. (a) False (b) True
8. 8.Which job needs a buzzer? (a) beep an alarm (b) turn to an exact angle (c) show the temperature (d) open a gate to 90°
9. 9.🔍 Which sensor would you use to start a fan when hot? (a) a rain sensor (b) a distance sensor (c) a light sensor (d) a temperature sensor
10. 10.🔍 Which sensor would you use to spot someone walking in? (a) a temperature sensor (b) a motion sensor (c) a gas sensor (d) a light sensor
11. 11.Which job needs a light sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) measure classroom noise (d) keep an incubator warm
12. 12.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
13. 13.True or false: to switch on lamps at dusk, use a rain sensor. (a) False (b) True
14. 14.Which job needs a temperature sensor? (a) make a parking alarm (b) keep an incubator warm (c) measure classroom noise (d) warn of a gas leak
15. 15.True or false: to close a window in rain, use a light sensor. (a) True (b) False
16. 16.🔍 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)?
17. 17.Which job needs a sound sensor? (a) open blinds at sunrise (b) measure classroom noise (c) warn of a gas leak (d) water a dry plant
18. 18.True or false: to close a window in rain, use a sound sensor. (a) True (b) False
19. 19.🔍 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
20. 20.Which job needs a soil moisture sensor? (a) water a dry plant (b) close a window in rain (c) stop a robot near walls (d) switch on with a clap
21. 21.Which job needs a temperature sensor? (a) start a fan when hot (b) switch on lamps at dusk (c) warn of a gas leak (d) make a parking alarm
22. 22.🔍 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?
23. 23.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a display (c) an LED (d) a motor
24. 24.True or false: to switch on lamps at dusk, use a distance sensor. (a) False (b) True
25. 25.True or false: to switch on with a clap, use a rain sensor. (a) False (b) True
26. 26.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) turn to an exact angle
27. 27.True or false: to stop a robot near walls, use a distance sensor. (a) False (b) True
28. 28.Which job needs a gas sensor? (a) make a parking alarm (b) measure classroom noise (c) warn of a gas leak (d) keep an incubator warm
29. 29.🔍 Which sensor would you use to switch on lamps at dusk? (a) a light sensor (b) a motion sensor (c) a gas sensor (d) a distance sensor
30. 30.🔍 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.True or false: to switch on with a clap, use a light sensor. (a) True (b) False
32. 32.Which job needs a light sensor? (a) start a fan when hot (b) open blinds at sunrise (c) measure classroom noise (d) close a window in rain
33. 33.Which job needs a distance sensor? (a) switch on lamps at dusk (b) stop a robot near walls (c) open blinds at sunrise (d) switch on with a clap
34. 34.🔍 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)?
35. 35.🔍 Which sensor would you use to stop a robot near walls? (a) a rain sensor (b) a distance sensor (c) a soil moisture sensor (d) a motion sensor
36. 36.⚙️ Which actuator would you use to show a status light? (a) a servo motor (b) an LED (c) a motor (d) a display
37. 37.Which job needs a motor? (a) beep an alarm (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
38. 38.True or false: to water a dry plant, use a motion sensor. (a) True (b) False
39. 39.True or false: to measure classroom noise, use a distance sensor. (a) True (b) False
40. 40.🔍 Which sensor would you use to switch on with a clap? (a) a gas sensor (b) a temperature sensor (c) a distance sensor (d) a sound sensor

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