Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 231 · 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 sensor would you use to stop a robot near walls? (a) a motion sensor (b) a soil moisture sensor (c) a temperature sensor (d) a distance sensor
2. 2.Which job needs a light sensor? (a) switch on lamps at dusk (b) measure classroom noise (c) warn of a gas leak (d) make a parking alarm
3. 3.True or false: to water a dry plant, use a soil moisture sensor. (a) False (b) True
4. 4.True or false: to spot someone walking in, use a temperature sensor. (a) True (b) False
5. 5.Which job needs a pump? (a) show the temperature (b) spin a robot’s wheels (c) open a gate to 90° (d) move water to plants
6. 6.🔍 Which sensor would you use to warn of a gas leak? (a) a distance sensor (b) a light sensor (c) a gas sensor (d) a sound sensor
7. 7.🔍 Which sensor would you use to start a fan when hot? (a) a temperature sensor (b) a motion sensor (c) a rain sensor (d) a soil moisture sensor
8. 8.🔍 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?
9. 9.⚙️ Which actuator would you use to beep an alarm? (a) a buzzer (b) an LED (c) a motor (d) a servo motor
10. 10.🔍 Which sensor would you use to switch on lamps at dusk? (a) a soil moisture sensor (b) a temperature sensor (c) a light sensor (d) a distance sensor
11. 11.True or false: to warn of a gas leak, use a rain sensor. (a) True (b) False
12. 12.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) an input (c) a fuse (d) an output
13. 13.True or false: to measure classroom noise, use a sound sensor. (a) False (b) True
14. 14.🔍 Which sensor would you use to measure classroom noise? (a) a rain sensor (b) a sound sensor (c) a distance sensor (d) a gas sensor
15. 15.⚙️ Which actuator would you use to turn to an exact angle? (a) an LED (b) a buzzer (c) a motor (d) a servo motor
16. 16.Which job needs a rain sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) start a fan when hot (d) close a window in rain
17. 17.Which job needs a temperature sensor? (a) switch on with a clap (b) make a parking alarm (c) keep an incubator warm (d) stop a robot near walls
18. 18.True or false: to warn of a gas leak, use a sound sensor. (a) True (b) False
19. 19.Which job needs an LED? (a) show a status light (b) open a gate to 90° (c) move water to plants (d) beep an alarm
20. 20.🔍 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?
21. 21.🔍 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)?
22. 22.Which job needs a motion sensor? (a) warn of a gas leak (b) spot someone walking in (c) open blinds at sunrise (d) water a dry plant
23. 23.🔍 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)?
24. 24.True or false: to start a fan when hot, use a gas sensor. (a) True (b) False
25. 25.Which job needs a distance sensor? (a) stop a robot near walls (b) keep an incubator warm (c) switch on lamps at dusk (d) spot someone walking in
26. 26.True or false: to switch on with a clap, use a sound sensor. (a) False (b) True
27. 27.🔍 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
28. 28.Which job needs a soil moisture sensor? (a) open blinds at sunrise (b) water a dry plant (c) stop a robot near walls (d) make a parking alarm
29. 29.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a pump (c) a motor (d) an LED
30. 30.Which job needs a gas sensor? (a) keep an incubator warm (b) warn of a gas leak (c) spot someone walking in (d) measure classroom noise
31. 31.Which job needs a buzzer? (a) spin a robot’s wheels (b) beep an alarm (c) show a status light (d) turn to an exact angle
32. 32.Which job needs a display? (a) show a status light (b) turn to an exact angle (c) spin a robot’s wheels (d) show the temperature
33. 33.⚙️ Which actuator would you use to show the temperature? (a) an LED (b) a motor (c) a display (d) a servo motor
34. 34.🔍 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)?
35. 35.True or false: to make a parking alarm, use a temperature sensor. (a) True (b) False
36. 36.⚙️ Which actuator would you use to move water to plants? (a) an LED (b) a servo motor (c) a pump (d) a motor
37. 37.🔍 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)?
38. 38.🔍 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.🔍 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)?
40. 40.True or false: to switch on with a clap, use a light sensor. (a) True (b) False

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