Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 306 · 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.Which job needs a motor? (a) turn to an exact angle (b) spin a robot’s wheels (c) show the temperature (d) show a status light
2. 2.🔍 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)?
3. 3.Which job needs a servo motor? (a) beep an alarm (b) show a status light (c) turn to an exact angle (d) spin a robot’s wheels
4. 4.🔍 Which sensor would you use to start a fan when hot? (a) a soil moisture sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
5. 5.⚙️ What is an actuator? (a) a sensor (b) a battery (c) an output that acts (d) a program
6. 6.🔍 Which sensor would you use to switch on lamps at dusk? (a) a gas sensor (b) a soil moisture sensor (c) a motion sensor (d) a light sensor
7. 7.Which job needs an LED? (a) show a status light (b) spin a robot’s wheels (c) show the temperature (d) open a gate to 90°
8. 8.Which job needs a buzzer? (a) beep an alarm (b) move water to plants (c) open a gate to 90° (d) show a status light
9. 9.🔍 Which sensor would you use to measure classroom noise? (a) a sound sensor (b) a distance sensor (c) a rain sensor (d) a soil moisture sensor
10. 10.🔍 For a microcontroller, is a sensor an input or an output? (a) an output (b) an input (c) a power source (d) a fuse
11. 11.⚙️ Which actuator would you use to show a status light? (a) a motor (b) an LED (c) a buzzer (d) a servo motor
12. 12.🔍 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
13. 13.True or false: to close a window in rain, use a motion sensor. (a) False (b) True
14. 14.🔍 Which sensor would you use to stop a robot near walls? (a) a distance sensor (b) a gas sensor (c) a motion sensor (d) a rain sensor
15. 15.Which job needs a display? (a) open a gate to 90° (b) show the temperature (c) beep an alarm (d) spin a robot’s wheels
16. 16.🔍 Which sensor would you use to close a window in rain? (a) a gas sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
17. 17.🔍 Which sensor would you use to keep an incubator warm? (a) a soil moisture sensor (b) a temperature sensor (c) a motion sensor (d) a sound sensor
18. 18.⚙️ Which actuator would you use to open a gate to 90°? (a) a pump (b) a servo motor (c) a buzzer (d) a motor
19. 19.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a pump (c) a display (d) a motor
20. 20.Which job needs a temperature sensor? (a) switch on with a clap (b) measure classroom noise (c) keep an incubator warm (d) spot someone walking in
21. 21.🔍 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
22. 22.True or false: to close a window in rain, use a soil moisture sensor. (a) False (b) True
23. 23.🔍 Which sensor would you use to switch on with a clap? (a) a rain sensor (b) a soil moisture sensor (c) a sound sensor (d) a gas sensor
24. 24.🔍 Which sensor would you use to warn of a gas leak? (a) a motion sensor (b) a distance sensor (c) a temperature sensor (d) a gas sensor
25. 25.🔍 Which sensor would you use to open blinds at sunrise? (a) a light sensor (b) a rain sensor (c) a motion sensor (d) a sound sensor
26. 26.Which job needs a rain sensor? (a) warn of a gas leak (b) measure classroom noise (c) stop a robot near walls (d) close a window in rain
27. 27.Which job needs a servo motor? (a) open a gate to 90° (b) show the temperature (c) show a status light (d) beep an alarm
28. 28.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a servo motor (b) a motor (c) an LED (d) a buzzer
29. 29.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
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.True or false: to make a parking alarm, use a light sensor. (a) True (b) False
32. 32.🔍 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
33. 33.True or false: to open blinds at sunrise, use a rain sensor. (a) False (b) True
34. 34.🔍 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
35. 35.Which job needs a distance sensor? (a) close a window in rain (b) keep an incubator warm (c) stop a robot near walls (d) switch on lamps at dusk
36. 36.True or false: to stop a robot near walls, use a temperature sensor. (a) True (b) False
37. 37.True or false: to close a window in rain, use a distance sensor. (a) False (b) True
38. 38.🔍 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?
39. 39.⚙️ Which actuator would you use to turn to an exact angle? (a) a servo motor (b) a pump (c) a motor (d) a display
40. 40.Which job needs a gas sensor? (a) keep an incubator warm (b) warn of a gas leak (c) make a parking alarm (d) spot someone walking in

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