Electronics Worksheet: Sensors and Actuators

Electronics lesson 26: Sensors and actuators · Set 210 · 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 soil moisture sensor? (a) water a dry plant (b) measure classroom noise (c) switch on lamps at dusk (d) keep an incubator warm
2. 2.Which job needs a motion sensor? (a) open blinds at sunrise (b) stop a robot near walls (c) start a fan when hot (d) spot someone walking in
3. 3.Which job needs a gas sensor? (a) switch on lamps at dusk (b) warn of a gas leak (c) spot someone walking in (d) start a fan when hot
4. 4.⚙️ Which actuator would you use to show a status light? (a) a motor (b) a pump (c) an LED (d) a display
5. 5.🔍 Which sensor would you use to keep an incubator warm? (a) a temperature sensor (b) a distance sensor (c) a motion sensor (d) a gas sensor
6. 6.🔍 Which sensor would you use to spot someone walking in? (a) a light sensor (b) a soil moisture sensor (c) a rain sensor (d) a motion sensor
7. 7.🔍 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?
8. 8.🔍 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)?
9. 9.🔍 Which sensor would you use to warn of a gas leak? (a) a soil moisture sensor (b) a gas sensor (c) a temperature sensor (d) a rain sensor
10. 10.🔍 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?
11. 11.True or false: to open blinds at sunrise, use a light sensor. (a) True (b) False
12. 12.True or false: to switch on with a clap, use a light sensor. (a) False (b) True
13. 13.⚙️ What is an actuator? (a) a battery (b) a program (c) a sensor (d) an output that acts
14. 14.Which job needs a light sensor? (a) water a dry plant (b) switch on with a clap (c) switch on lamps at dusk (d) measure classroom noise
15. 15.🔍 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
16. 16.🔍 Which sensor would you use to water a dry plant? (a) a light sensor (b) a temperature sensor (c) a soil moisture sensor (d) a motion sensor
17. 17.🔍 Which sensor would you use to close a window in rain? (a) a motion sensor (b) a rain sensor (c) a distance sensor (d) a temperature sensor
18. 18.⚙️ Which actuator would you use to spin a robot’s wheels? (a) a buzzer (b) a motor (c) a pump (d) a servo motor
19. 19.Which job needs a display? (a) spin a robot’s wheels (b) show the temperature (c) open a gate to 90° (d) turn to an exact angle
20. 20.Which job needs an LED? (a) show a status light (b) move water to plants (c) beep an alarm (d) spin a robot’s wheels
21. 21.🔍 For a microcontroller, is a sensor an input or an output? (a) a power source (b) a fuse (c) an input (d) an output
22. 22.🔍 Which sensor would you use to measure classroom noise? (a) a temperature sensor (b) a sound sensor (c) a light sensor (d) a soil moisture sensor
23. 23.Which job needs a buzzer? (a) turn to an exact angle (b) open a gate to 90° (c) show the temperature (d) beep an alarm
24. 24.⚙️ Which actuator would you use to show the temperature? (a) a display (b) an LED (c) a pump (d) a motor
25. 25.🔍 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.⚙️ Which actuator would you use to beep an alarm? (a) a display (b) a pump (c) an LED (d) a buzzer
27. 27.True or false: to switch on lamps at dusk, use a light sensor. (a) True (b) False
28. 28.True or false: to make a parking alarm, use a sound sensor. (a) False (b) True
29. 29.Which job needs a distance sensor? (a) warn of a gas leak (b) start a fan when hot (c) make a parking alarm (d) switch on lamps at dusk
30. 30.Which job needs a servo motor? (a) beep an alarm (b) turn to an exact angle (c) spin a robot’s wheels (d) move water to plants
31. 31.Which job needs a pump? (a) move water to plants (b) show a status light (c) spin a robot’s wheels (d) open a gate to 90°
32. 32.Which job needs a temperature sensor? (a) switch on lamps at dusk (b) open blinds at sunrise (c) start a fan when hot (d) close a window in rain
33. 33.True or false: to water a dry plant, use a soil moisture sensor. (a) True (b) False
34. 34.🔍 Which sensor would you use to open blinds at sunrise? (a) a distance sensor (b) a soil moisture sensor (c) a temperature sensor (d) a light sensor
35. 35.🔍 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.⚙️ Which actuator would you use to turn to an exact angle? (a) a display (b) a servo motor (c) a buzzer (d) a pump
37. 37.Which job needs a rain sensor? (a) close a window in rain (b) measure classroom noise (c) stop a robot near walls (d) switch on with a clap
38. 38.🔍 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)?
39. 39.True or false: to water a dry plant, use a temperature sensor. (a) True (b) False
40. 40.True or false: to make a parking alarm, use a distance sensor. (a) False (b) True

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