Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 109 · 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 motion sensor. (a) True (b) False
2. 2.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) make a parking alarm (d) spot someone walking in
3. 3.True or false: to stop a robot near walls, use a distance sensor. (a) True (b) False
4. 4.Which job needs a motor? (a) turn to an exact angle (b) open a gate to 90° (c) show a status light (d) spin a robot’s wheels
5. 5.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a display (c) a motor (d) a pump
6. 6.Which job needs a light sensor? (a) keep an incubator warm (b) open blinds at sunrise (c) water a dry plant (d) make a parking alarm
7. 7.🔍 Which sensor would you use to switch on lamps at dusk? (a) a rain sensor (b) a soil moisture sensor (c) a gas sensor (d) a light sensor
8. 8.🔍 Which sensor would you use to spot someone walking in? (a) a motion sensor (b) a sound sensor (c) a rain sensor (d) a distance sensor
9. 9.🔍 Which sensor would you use to close a window in rain? (a) a light sensor (b) a motion sensor (c) a rain sensor (d) a soil moisture sensor
10. 10.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) show a status light
11. 11.Which job needs a pump? (a) show the temperature (b) open a gate to 90° (c) beep an alarm (d) move water to plants
12. 12.⚙️ What is an actuator? (a) a battery (b) an output that acts (c) a program (d) a sensor
13. 13.Which job needs a display? (a) turn to an exact angle (b) show a status light (c) spin a robot’s wheels (d) show the temperature
14. 14.🔍 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)?
15. 15.True or false: to measure classroom noise, use a gas sensor. (a) False (b) True
16. 16.True or false: to warn of a gas leak, use a gas sensor. (a) False (b) True
17. 17.True or false: to start a fan when hot, use a light sensor. (a) True (b) False
18. 18.🔍 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)?
19. 19.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True
20. 20.Which job needs a distance sensor? (a) start a fan when hot (b) water a dry plant (c) close a window in rain (d) make a parking alarm
21. 21.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
22. 22.🔍 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.Which job needs an LED? (a) spin a robot’s wheels (b) turn to an exact angle (c) show a status light (d) move water to plants
24. 24.Which job needs a motion sensor? (a) make a parking alarm (b) start a fan when hot (c) switch on with a clap (d) spot someone walking in
25. 25.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
26. 26.🔍 For a microcontroller, is a sensor an input or an output? (a) a fuse (b) an output (c) a power source (d) an input
27. 27.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a light sensor (c) a rain sensor (d) a gas sensor
28. 28.True or false: to close a window in rain, use a rain sensor. (a) False (b) True
29. 29.🔍 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?
30. 30.Which job needs a distance sensor? (a) keep an incubator warm (b) water a dry plant (c) stop a robot near walls (d) switch on with a clap
31. 31.🔍 Which sensor would you use to make a parking alarm? (a) a temperature sensor (b) a sound sensor (c) a distance sensor (d) a gas sensor
32. 32.Which job needs a temperature sensor? (a) close a window in rain (b) measure classroom noise (c) open blinds at sunrise (d) start a fan when hot
33. 33.⚙️ Which actuator would you use to move water to plants? (a) a display (b) an LED (c) a pump (d) a buzzer
34. 34.🔍 Which sensor would you use to measure classroom noise? (a) a soil moisture sensor (b) a sound sensor (c) a rain sensor (d) a distance sensor
35. 35.True or false: to switch on lamps at dusk, use a temperature sensor. (a) True (b) False
36. 36.🔍 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?
37. 37.🔍 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.Which job needs a temperature sensor? (a) keep an incubator warm (b) close a window in rain (c) open blinds at sunrise (d) warn of a gas leak
39. 39.Which job needs a buzzer? (a) spin a robot’s wheels (b) show the temperature (c) move water to plants (d) beep an alarm
40. 40.🔍 Which sensor would you use to water a dry plant? (a) a rain sensor (b) a light sensor (c) a sound sensor (d) a soil moisture sensor

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