Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 40 · 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.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) a power source (c) an output (d) an input
2. 2.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
3. 3.🔍 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
4. 4.🔍 Which sensor would you use to keep an incubator warm? (a) a light sensor (b) a sound sensor (c) a distance sensor (d) a temperature sensor
5. 5.🔍 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)?
6. 6.🔍 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)?
7. 7.True or false: to make a parking alarm, use a distance sensor. (a) True (b) False
8. 8.⚙️ Which actuator would you use to beep an alarm? (a) a pump (b) an LED (c) a motor (d) a buzzer
9. 9.Which job needs a soil moisture sensor? (a) switch on with a clap (b) make a parking alarm (c) water a dry plant (d) keep an incubator warm
10. 10.Which job needs a motion sensor? (a) start a fan when hot (b) warn of a gas leak (c) make a parking alarm (d) spot someone walking in
11. 11.Which job needs a distance sensor? (a) water a dry plant (b) open blinds at sunrise (c) start a fan when hot (d) stop a robot near walls
12. 12.🔍 Which sensor would you use to water a dry plant? (a) a sound sensor (b) a distance sensor (c) a rain sensor (d) a soil moisture sensor
13. 13.🔍 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.True or false: to switch on lamps at dusk, use a sound sensor. (a) False (b) True
15. 15.🔍 Which sensor would you use to close a window in rain? (a) a distance sensor (b) a rain sensor (c) a gas sensor (d) a light sensor
16. 16.True or false: to start a fan when hot, use a gas sensor. (a) False (b) True
17. 17.⚙️ Which actuator would you use to show a status light? (a) a buzzer (b) a pump (c) a servo motor (d) an LED
18. 18.Which job needs a pump? (a) move water to plants (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
19. 19.🔍 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?
20. 20.🔍 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?
21. 21.🔍 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?
22. 22.🔍 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)?
23. 23.True or false: to switch on with a clap, use a gas sensor. (a) False (b) True
24. 24.🔍 Which sensor would you use to stop a robot near walls? (a) a gas sensor (b) a temperature sensor (c) a motion sensor (d) a distance sensor
25. 25.Which job needs a temperature sensor? (a) switch on with a clap (b) make a parking alarm (c) switch on lamps at dusk (d) start a fan when hot
26. 26.True or false: to spot someone walking in, use a motion sensor. (a) False (b) True
27. 27.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) move water to plants (d) open a gate to 90°
28. 28.🔍 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?
29. 29.⚙️ What is an actuator? (a) a sensor (b) an output that acts (c) a program (d) a battery
30. 30.Which job needs a sound sensor? (a) keep an incubator warm (b) start a fan when hot (c) switch on with a clap (d) switch on lamps at dusk
31. 31.Which job needs a motor? (a) beep an alarm (b) open a gate to 90° (c) move water to plants (d) spin a robot’s wheels
32. 32.Which job needs a sound sensor? (a) spot someone walking in (b) close a window in rain (c) warn of a gas leak (d) measure classroom noise
33. 33.⚙️ Which actuator would you use to show the temperature? (a) a pump (b) a servo motor (c) an LED (d) a display
34. 34.🔍 Which sensor would you use to warn of a gas leak? (a) a temperature sensor (b) a gas sensor (c) a soil moisture sensor (d) a sound sensor
35. 35.True or false: to switch on with a clap, use a rain sensor. (a) True (b) False
36. 36.True or false: to make a parking alarm, use a soil moisture sensor. (a) False (b) True
37. 37.True or false: to keep an incubator warm, use a rain sensor. (a) False (b) True
38. 38.True or false: to spot someone walking in, use a rain sensor. (a) False (b) True
39. 39.True or false: to switch on lamps at dusk, use a light sensor. (a) False (b) True
40. 40.Which job needs a servo motor? (a) show a status light (b) open a gate to 90° (c) spin a robot’s wheels (d) beep an alarm

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