Electronics Worksheet: Sensors and Actuators

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

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