Electronics Worksheet: Sensors and Actuators

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

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